Most of the canyons between the Pacific and Skyline Drive in San Mateo county are private land or regional open space.

However, if you head up Higgins Canyon Road, past several farms you will come to Burleigh Murray Ranch State Park, POTA reference US-7376.

This park, acquired by the State of California in 1983, extends from the parking area, up the coastal hills to Highway 35 and features several 19th century structures that are “maintained in a state of arrested decay.”

A sign warned of mountain lions, but I think the extensive poison oak is the greater hazard here.

I was fortunate to have a hiking buddy join me for the mile long trek up the activation spot at a couple of picnic tables just shy of the old barn. A single table is available at the trailhead if you wanted to activate without the walking.

The road winds up a gentle slope and crosses Mills Creek a couple of times along the way.

The fancy new KH1 has been getting all the love recently, so I decided to give the Mountaintopper MTR-4B a chance to activate a park. The QMX came along in case high bands were needed, and of course the KH1 was there as a backup station in case I’d forgotten any crucial piece of kit.

An 8 ounce throw weight easily lofted a length of arborist throw line with which I hoisted a 20 meter EFHW. The Spark Plug matching transformer offered an SWR of 1.1 to the MTR, and with 11.7 volts remaining the battery from the previous activation, the rig put out a solid 4 watts.

I’d forgotten how quiet a radio the Mountaintopper is. Turning it on I feared the 20 meter band was “dead” or that the coastal hills were blocking all the signals. I tuned around a bit and chased KD2KW in Texas, this told me 20 was working fine and that my 4 watts would be enough power.

I started calling CQ POTA and the RBN picked me up, causing my scheduled activation to be spotted. I know this because I started getting responses to my calls. With no cell service this far out of Half Moon Bay I was unable to access pota.app to see all the action on spots page.

About 45 minutes of calling yielded the 10 QSOs needed for a complete activation. Mapping the contacts showed that from this location 20 meters favored stations to the North and East today.

We packed up the station and began the easy “hike” back to the car, stopping occasionally to carefully snatch some sweet blackberries that were abundant along the trailsides.

73 de W6CSN

Bletchley Park

Most readers of this blog are probably familiar with Bletchley Park and the significance of this place in breaking the codes used by the axis military forces during the second world war.

The electromechanical systems developed and used here to aid the codebreakers in their daily work led directly to the electronic digital computers of the mid-twentieth century, and then to the modern world as we know it.

After boarding the London Northwestern Railway at Euston station, the hour long train journey took us from central London, through the suburbs, then the pastoral English countryside to the station at Bletchley, just south of Milton Keynes.

Bletchley Park is a five minute walk from the train station at Bletchley, the town of the same name. In keeping with the formerly clandestine nature of the work at Bletchley Park, there are no loud signs to welcome you, just the Union Jack flying over the nondescript visitor center in Block C.

Exiting the visitor center, any ham will quickly spot the three-element SteppIR Yagi perched atop a roof-mounted tower. Also from the tower, a folded dipole extends over the the Block B building which houses the Alan Turing museum exhibits. The other end of this antenna farm is plugged into GB3RS, the amateur radio station for the National Radio Centre of the RSGB.

The friendly and helpful staff of amateurs at the NRC played a crucial role in my hoped-for plan of activating Bletchley Park for Parks On The Air.

Surprisingly, the POTA page for GB-0507 showed only a handful of activations of this iconic location. Seeing as this is a heritage site, I sent an email to the NRC about week before my visit asking for advice on how to be a welcome guest POTA operator.

Note, the NRC is colocated on the grounds of the museum but they are not a part of Bletchley Park. The NRC is a separate organization.

Martyn G0GMB, the Director of the NRC, kindly responded to my enquiry and informed me that individual amateur radio activity is not generally permitted on the grounds of Bletchley Park due to the number of visitors they receive and concerns about RF safety. This could explain the low number of activations.

Martyn suggested I could set up in the overflow car park few minutes walk down the road from the visitor center. While not on the grounds of Bletchley Park proper, the parking lot operation would still be in the spirit of POTA and would reasonably count as a valid activation location.

When I arrived at Bletchley Park on Friday afternoon, I was met by Mervyn G4KLE who was expecting me thanks to a note left by OM G0GMB. Mervyn asked where all my equipment was and I motioned to the pack on my back.

Because my radio and antenna was a low impact, minimal footprint QRP setup, I was told that I could make use of the picnic table just out the side door of the GB3RS shack, with my antenna setup just beside it. This dead-end spot was not on any of the paths frequented by park visitors and my antenna would not be easily visible.

This was a much better arrangement than trying to activate from a car park without a car! I quickly deployed a GRA-GNT micro tripod with center spike pushed easily into the soft ground. The GRA-7350T loaded vertical and a set of short radials provided an SWR of 1.05 to 1.

I chose the QMX as a travel radio while in Britain because with it, the overall kit is very lightweight and compact. With the exception of the tripod the whole kit fits in my carry-on. The GRA-GNT antenna mounting kit has to fly in checked baggage due to several aggressive looking spikes that would certainly be flagged by airport security.

One of the display cases inside the NRC shows an original QCX radio produced by Hans Summers G0UPL, so it is only fitting for the QMX to be operated in its ancestral homeland.

I scheduled the activation for the whole day on the POTA app and thankfully the RBN connection was working well and spotted me just moments after starting to call “CQ POTA DE M/W6CSN” which was programmed into message slot #1 on the QMX.

I had no idea what to expect working a POTA activation in Great Britain and where most of the awake ham population would be European. As such I was a little surprised when the first call was from K2UPD in Kentucky, USA – and he was loud.

Throughout the hour that I was on the air there was alternating periods of sunshine and clouds with occasional light rain. The rain was nothing that couldn’t be handled by the Rite-In-The-Rain logbook and by simply closing the flap of the Maxpedition pouch that held the radio and battery.

However, needing just two more contacts for a complete activation, the skies started chucking down rain in large quantities. At this rate both the station and the operator would soon be thoroughly soaked. I hastily made an arrangement with Mervyn G4KLE where he turned the power down on GB3RS as low as it would go and I worked him both as GB3RS and then G4KLE to finish out the ten.

While that stunt may have stretched the spirit of the rules, they were valid over-the-air contacts and counted for POTA. I was simply working him line of sight off the side of his beam.

I quickly bundled all the stuff back into the GB3RS shack and tried to dry the wettest of the equipment before stowing it all back in my pack.

I can say with confidence that without the kind assistance from Martyn, Mervyn, and the whole gang at the National Radio Centre that my attempt to do a POTA activation at this important historical site would not have been successful, if it even happened at all. They really are a great bunch of guys.

If you ever visit Bletchley Park, which I highly recommend, and are thinking about doing a POTA activity it is imperative that you contact the people at the NRC ahead of time and make appropriate arrangements. GB-0507 is a sensitive and historically significant site, do not just show up with a bunch of ham radio equipment and expect that you’ll be able to operate.

---

Hyde Park

A couple of days after the successful excursion to Bletchley Park, I had some time available in the morning and I had been wanting to do another POTA activation while in London. Hyde Park is smack in the center of London and is designated POTA reference GB-0401 – I figured now was good time to try to get it.

I consulted the marvel of deception that is the London Underground Map and saw that just three stops from our hotel on the Jubilee Line would take me within walking distance of Hyde Park.

Bill Bryson in his book “Notes from a Small Island” has this to say about the London Underground Map:

What a piece of perfection it is, created in 1931 by a forgotten hero named Harry Beck, an out of work draughtsman who realized that when you are underground it doesn’t matter where you are.

Alighting at Green Park station it was approximately a quarter mile walk to Hyde Park Corner. I kept going, deeper into the park, hoping to put some distance between the operating location and what I presumed would be higher RFI emanating from the modern urban environment at the edges of the park.

A park bench which backed up against an area of taller grass seemed like a good choice since it was off the main trail and I could set up the antenna in an area unlikely to be frequented by people.

After spotting myself, I again set to calling CQ POTA with my “M/” prefixed callsign. Conditions weren’t great it seemed, but I did make three contacts before the rain once again began falling in earnest.

Waiting out the rain showers was no longer an option as I was running out of time. However, since theoretically I had until 11 o’clock that night to complete the activation, I could come back later in the afternoon and try to wrap it up.

It took several hours to help my daughter to finish packing up and getting moved out of her apartment and back to our hotel, from which we’d leave early the next day for Heathrow for our flight back to San Francisco.

After an early dinner we found our way back to Hyde Park which was a much busier place now than it was at 8AM. The park bench which I had used earlier was unavailable so I found a place to set up the station at the edge of a broad field.

This time around, while there were definitely stations on the bands, they either weren’t hearing me or not in the mood to answer my QRP calls.

The week of walking all over (and under) London, the chilly afternoon weather, and sitting on the ground making no contacts finally got the better of me. After an hour of trying I decided to throw in the towel.

Z35M/P	North Macedonia	20 meters	2024-06-16 07:56
CT1GFK	Portugal	20 meters	2024-06-16 08:01
K2UPD	Kentucky, USA	20 meters	2024-06-16 08:16

The three contacts made that morning would have to do. I uploaded my log to POTA later that evening from the hotel. While not thrilled with being the first to attempt, but not complete, the activation of Hyde Park, I put a positive spin on it. All the other activators that come after me don’t have to worry about being the first to bust an activation here. Hi Hi.

Conclusion

Rain and Sun, complete and incomplete activations, these radio outings in Great Britain were a lot of fun and enabled me to tick the box next to one of this year’s ham radio goals, which was do to a POTA activation in a foreign country.

73 de M/W6CSN

For last year’s Field Day, I took a stab at networking a couple of computers together with an ethernet cable so that our N1MM+ logging software could be synced up. It was both surprisingly easy to do, but equally daunting due to the curious lack of reasonably digestible tutorials tackling the topic on the interwebs. So now that Field Day is again upon us, I felt that same sort of dread that comes from staring up at a steep learning curve. Because quite frankly, I could not remember at all how to create a N1MM+ computer network. I checked back at my blog page on the topic, and was dismayed at how little of the process I documented. So, I am here to rectify that.

Here is my use case. I want to have three computers with Windows 10 operating systems host logging software (N1MM Logger Plus) for a multiple station ARRL Field Day event. All of the computers need to be synchronized with each other in order to avoid such dreaded contesting faux pas as “dupes”, i.e., getting the same person twice. I also do not want to have to rely on an internet in order to maintain communication between these computers.

As far as hardware goes, I already was in possession of three (quite aged) computers. I splurged on three new 25′ ethernet (CAT 6) cables (one for each computer), and a Linksys 8-Port Gigabit Ethernet Switch. I set up the computers simply by plugging one end of an ethernet cable into its ethernet port, and the other end of the cable into the switch. Remember the gigabit switch does need power to operate!

Before I began networking the computers, I had updated all of the necessary software, including Windows and N1MM+. All of the computers need to have the exact same version of N1MM+, as well as exactly the same inputted contest information, before N1MM+ is able to synchronize between multiple stations.

Once the hardware was gathered and the software was up-to-date, I followed the step-by-step procedure documented below.

Step 1: Go to internet icon, click, and “Open Network & Internet Settings”.

Step 2: Select “Ethernet” on left, and then “Network and Sharing Center” on right.

Step 3: The “Unidentified Network” is set to “private” which is what I want it to be. For contrast, my wifi network is set to “Public” (see arrow on the left). Click on the “Ethernet” hyperlink.

Step 4: Click on “Properties” of the first box that pops up. Then click on “Internet Protocol Version 4 (TCP/IPv4)”.

Step 5: Click “Use the following IP address” and add in “192.168.1.200” for “IP address”. The “Subnet mask” should just show up as 255.255.255.0. While I am no expert by any means in networking computers, I do think you can choose the last three digits of your IP address from 1 to 255 254 [Correction sent to me by my favorite critic, AC1JR!] I picked “200” rather arbitrarily. Once you are done, click “ok”, “ok”, and “close” on the multiple windows.

Step 6: If you need to make your network private because it is showing as public (see Step 3 above), you need type “secpol.msc” into the search bar and press enter.

Step 7: In the pop-up window, click on the “Network List Manager Policies” under the “Security Settings” tab. Then click “Unidentified Networks”. In the next pop-up, choose “Private”. Hit “Apply” and then “Ok”. Your “Unidentified Network” settings should now say “Private”.

Step 8: Open the file manager and click on “Network”. Your computer’s name should be listed there. My computer is named “PC-1”.

Step 9: Now it is time to network your second computer. Go back through Steps 1-8, but this time on the new computer. Below shows all of the steps ordered numerically. Don’t forget to change the ethernet connection to “Private” as shown above. The only difference is that you want to assign this computer a different IP address than the first one. I chose 192.168.1.201.

Step 10: Check the “Network” tab in the file manager to make sure the second computer (in my case, “PC-2”) shows up.

Step 11: Repeat these steps as many times as you need to in order to connect all of your computers to the network. Just change the last digits of the newly assigned static IP address, as they all have to be something different. I have three computers that are now linked together.

Step 12: Once your computers are all networked, open N1MM. Under the “Window” menu, find and click “Network Status”.

Step 13: Make sure that the most recent version of N1MM is installed or else you will get an error message when attempting to connect to the other networked computers (in red below). You also need to make sure that everything else about N1MM is identical, in particular that the contest information for the log is the same.

Step 14: When all of the computers are identically set-up, with the same software versions and contest information, open up the “Network Status” window. A bubble will show that gives you an option to turn on “Networked Computer Mode”. Click it!

Step 15: If you see all of your computers listed with no red error messages, your networking efforts are a success! Make sure you have designated one of the computers as the “Master” by checking the appropriate box.

There you have it! N1MM Logger Plus synchronized across multiple stations for Field Day! I hope to catch you on the air!

Forever,

KM1NDY

If you’re following the new Xiegu X6200 closely, you might recall that I took a prototype version of the radio out two weeks ago for a POTA activation. Propagation was so challenging–as in, a complete radio blackout in North America due to an X-Class flare–it took about 90 minutes of calling CQ POTA to snag … Continue reading The New Xiegu X6200: First POTA activation in CW with a production unit! →

With ARRL Field Day around the corner, it is the time of year where amateur radio operators far and wide wonder if they are going to be stuck having their QSOs wiped out every time their neighbor keys up the microphone. Interference between stations in a multi-transmitter field day operation can be the norm if you didn’t think to use band pass filters.

So out my stash of little gray metal boxes came, and I began checking their VSWRs for a down-‘n’-dirty pre-Field Day check-a-roo…

I don’t love the VSWR trace of this 6M filter, but it will probably suffice for Field Day, where I plan on setting up a 6M 4-element beam, and operating largely on FT8 to try to intercept the “Alpha” stations that are trying to rack up the “Free VHF station” points. That, and when else do I get to put up my 6M yagi???? FT8 is operated on 50.313 MHz which should have a VSWR under 1.2.

These Array Solutions elliptic filters have a beautiful looking VSWR. I really wish I had spent my ham bucks acquiring a full set of these. Apparently Array Solutions is not making them anymore, but a company called Hamation is? Oh, and for anyone not familiar with the RigExpert Antenna Analyzer (1-port VNA), the blue portion of the display indicates the ham band with frequency along the horizontal access and VSWR on the vertical access. Keep in mind that the VSWR we want is as close to 1 as possible!

Now 12M is a WARC band of course, meaning you cannot use it for contesting. In general, it is second only to 60M as my least used band. But, boy, that band pass filter looks great!

I expect 15M to be hopping on Field Day. I am glad this filter looks good.

Another WARC band, i.e. Field Day no-go… But a good looking filter!

Now 20M. Let’s just say I am not at all happy with this filter. Granted, it has probably been heavily abused over its several years now with me. Dunestar has gone out of business since August of 2023. Their original owner became a silent key right around the time that I purchased this set. I decided to try out Morgan Systems Surestop bandpass filters for 20M and 40M for this year’s Field Day. You’ll notice the 40M filter looks reasonable, but when actually under use, the VSWR seen at the transceiver is often high. And we can’t be without a highly functional 20M and 40M stations when it comes to Field Day operations. We will see how the Surestop filters behave…

The 30M filter looks superb! Of course, there is no operating 30M on Field Day.

The 40M filter looks a bit janky. Technically, it should function okay. But like I mentioned, this filter often creates a high SWR at the transceiver. I have a replacement here for it now.

Ugghh. The 80M filter is downright scary looking. I probably should have replaced it when I had a chance.

The top band filter isn’t great. What else can I say? I am not sure I ever even used this filter on 160M. I do think I will slowly start replacing my filters with one of the other manufacturers with time. Although I am grateful to have been able to get a set of Dunestar filters, especially since they provided a boatload of good multi-operator experiences over the years, the older and wiser me wishes I had put my money elsewhere.

Here are the “guts” of one of the Array Solutions 3rd order elliptic filters. Note the interesting use of a hot glue like substance to hold the windings in place, the beefy size of the enameled wire, and the use of ceramic capacitors. Silver-Mica capacitors are often recommended for use in band pass filters

…and a representative schematic from this excellent LC Filter Design calculator by Marki Microwave…

Now we can contrast the design and construction of the Array Solutions band pass filter with the 2nd order Dunestar bandpass filter (below). This design consists of two airwound coils and capacitors mirroring and shielded from each other on the input and output side.

Every time I get around to thinking about, testing, and opening up my band pass filters, I can’t help but think: It would be so much better to make these myself. For some reason, this does not seem to be an area that has been overly tackled by hams. In fact, there is really only one prevailing design by Lew Gordon K4VX, a 3rd order Butterworth filter, that is well-described and seems easy-ish to reproduce by the average everyday ham (i.e., one that does not design RF products for a living). The W3NQN band pass filter design article is a much more complex document to follow.

I have dabbled in making band pass filters before, but have found myself hindered by the testing process. I since learned to use the “low Z” setting of my oscilloscope. So, once I again, I found myself constructing an ugly little device, this time a low-power 160M version of K4VX’s Butterworth filter. The schematic, construction, and component values are all documented in the article. This is nothing more than a capacitor (~4000 pF) and inductor (~2.2 µH) connected in parallel on the left hand side as well as a capacitor (~4000 pF) and inductor (~2.2 µH) connected in parallel on the right hand side, with another capacitor (~400 pF) and inductor (22 µH) in series in the middle connecting the two sides. I just soldered everything together and attached it across VHF connectors.

And although the Marki Microwave design tool proposes different capacitor and inductor values for its version of the 160M 3rd order Butterworth band pass filter, you can still get an idea of what the schematic, and scatter plot parameters (insertion loss and return loss) of the filter should look like.

The first test I performed with the band pass filter was pass a sine wave through it from below the 160M band (which spans from 1.8 MHz to 2 MHz). I started with 500 kHz and passed the signal into my oscilloscope, making sure to turn on the low impedance (50 ohm) setting.

I did indeed have a fairly weak signal.

When I increased the signal generator frequency so that the waveform outputted was within the pass band of the filter (1.8 MHz), the oscilloscope showed a much larger voltage. Keep in mind that it is Channel 2 (“CH2”, the bottom box!), that you want to be looking at on the signal generator if you are following along with the pictures.

There is no change to the oscilloscope settings between the 1.8 MHz input (below) and the 500 kHz input (earlier). Clearly the voltage recovered at the 1.8 MHz setting is much larger.

Now to take a look at the NanoVNA results. The filter was simply placed between port 0 and port 1 of the NanoVNA. The vertical gray bar represents the frequency range of the 160M ham band. The filter I constructed did not use components of the exact values recommended in the K4VX article, thus the reason the filter performs at a lower frequency than expected.

Regardless, you can see below that the shape of the S11 (return loss) and S21 (insertion loss) parameters are very similar to that predicted by the Marki calculator. My filter is below:

And, again, the S11 and S21 parameters as predicted by the Marki calculator:

Well, there you have it. Band pass filter season! Field Day is almost here, and we are going to go with what we have. However, my mind has been spinning around the idea of constructing my own band pass filters so that I can more easily fix and replace the rather fragile devices as needed. And although this was a tiny little experiment, I think it shows that these band pass filter designs are indeed reproducible with accuracy. Will a KM1NDY band pass filter design show up here in the near future?! The Magic 8 Ball says “Reply Hazy. Try Again Later”!

Catchya on the flippity flip!

KM1NDY

The spontaneous HF radio operating enabled by the new Elecraft KH1 handheld transceiver opens up a whole new set of opportunities for the POTA activator. Combined with the sprawling Golden Gate National Recreation Area (US-0647) you could do an awful lot of POTA activations and not operate from the same spot twice.

Nestled between the San Francisco Maritime NHP and the Marina Green, Fort Mason and the land it occupies was a location of military importance from before California was a U.S. state through the second World War.

My plan today was to operate from Black Point Battery, a fortification from the time of the American Civil War, or the war between the states, if you prefer. This location is of particular interest to me because over 40 years ago I worked a summer job on an archaeology crew that unearthed this gun battery.

I remember digging and sifting a lot of dirt! We frequently found spent primers used to fire the guns, there were hundreds of them! Occasionally we’d find “live” primers which had to be treated with care. What was most exciting however is when the timbers that supported the semi-circular track on which the guns would pivot were uncovered.

While it wasn’t particularly busy, I didn’t want to setup a separate antenna atop the berm because there is a pathway there that people use to get sweeping views of San Francisco Bay. I deployed the KH1 with the supplied 4 ft. whip and Tufteln 3D printed angle adapter while sitting atop a concrete entryway to one of the old magazines.

Although I checked conditions before heading out, it seemed that propagation was really quite poor today. In a half hour of tuning and calling, I’d only managed a single QSO on 20m while 17m and 15m seemed completely dead. This was unusually quiet for a Saturday afternoon.

With only two hours of parking, if I wanted a chance at a valid activation then I needed a new plan. I descended the hill down to the the piers that served as the point of embarkation for servicemen heading into the Pacific war in the 1940s.

I found a spot behind the old firehouse that offered protection from the wind which was really blowing at this point, too windy even for a tripod vertical. However, I felt I needed longer antenna to combat the lousy propagation with my QRP signal.

I walked back to the car and retrieved a quick release mount and MFJ-1979 telescoping whip antenna. This quarter wave vertical gives a 1-to-1 match on 20 meters when fully extended. A length of ABR Industries RG-316 connected the antenna to the BNC port in the KH1. I bypassed the internal tuner and got a “perfect” match.

With this setup, and being closer to the Bay waters, I was able to make more progress towards a complete activation. A rocky outcrop at the base of Black Point blocked my view to the east and southeast, but I had a clear shot over the Bay to the north so, unsurprisingly, this is where most of the contacts came for today’s activation.

Fortunately, 30 more minutes was all that was needed to fill the log with the QSOs for a complete activation. Even though this wasn’t a purely pedestrian mobile expedition, like the Wave Organ, I probably would not have even come to this spot without the inspiration provided by the KH1.

Many thanks to the hunters and other activators that ultimately made this POTA a success. Some of the call signs in the log were familiar and some were brand new to me, this is my favorite kind of operation to work both old and new friends.

Equipment used in this activation:

• Elecraft KH1 with internal tuner and whip antenna.
• MFJ-1979 telescoping whip.
• ABR Industries RG-316, 25 feet.
• Rite In The Rain spiral notepad.
• Zebra Mechanical Pencil
• Quick Release 3/8×24 antenna mount

73 de W6CSN

is not always the adventure you expect. Recently I’ve been plotting a unique activation of the De Anza National Historic Trail, but that particular POTA activation is going to need a good antenna and just as importantly, time.

This day afforded a few hours in the morning for outdoor radio but not enough to retrace the steps of the De Anza expedition. Instead, I headed down to the San Francisco Bay side for a quick outdoor amateur radio session.

Since it was was a Saturday, my usual spot at Presidio East Beach was heavily impacted by weekend recreation enthusiasts, so I continued for a quarter mile to the practically empty parking lot east of the St. Francis Yacht Club.

Thence on foot past the old stone light tower and the clubhouse of the Golden Gate Yacht Club, you find yourself of the path to the end of the breakwater where a unique art installation sits.

The Wave Organ is a curious sculpture that uses tubes and cavities between old cemetery stones to channel and amplify the watery sounds of waves as the tides move in and out of the Bay.

Surrounded by saltwater at the end of this jetty, which by my reckoning is within the boundary of the Golden Gate National Recreation Area (US-0647), this location was perfect for the “no impact” operation afforded by the Elecraft KH1.

My plan was to see if I could complete an activation of making 10 contacts entirely by hunting other POTA activators, perfectly reasonable given it was a weekend with no geomagnetic storms to disrupt radio propagation.

What I did not count on was that it was a contest weekend with both 20 and 15 meters wall-to-wall with rapid fire contesters. As a QRP station, finding the POTA needles in that haystack was going to be tough.

I retreated to 17 meters which should offer good daytime propagation and no contesters. There on 18 MHz, I was was able to collect five park-to-park contacts in a span of 23 minutes.

At that point I’d exhausted all of the 17m active CW stations on the POTA spots page and didn’t really have time to wait for more to show up. Therefore the “all hunting” activation strategy was abandoned and I commenced calling “CQ POTA.”

The activation was “validated” with a call from Dave, AA7EE as the 10th QSO and then completed with one more park hunted, K9DXA in US-1001. Most of the contacts were with stations east of the Rockies.

One thing I learned from earlier outings with the KH1 was to not cut the log sheets too small, as might be suggested by the lines printed on the page. Without enough paper under the top and bottom tabs of the logging tray the sheets can easily be caught and snatched away by the wind.

Leave enough margin on the logging sheets and they are easily secured in the tray, even in the face of brisk Bay breezes.

The “hunting only” activation plan didn’t quite work out but it was a great time out playing radio at scenic spot in San Francisco Bay.

While I didn’t expect to activate from the wave organ today, it turned out to be a fun adventure and an excellent spot from which to get on the air with the KH1.

73 de W6CSN

The outdoor amateur radio adventures documented in this blog so far have taken place entirely within my home state of California. Recently, I took off by car to visit family in Washington state. This wasn’t really a POTA oriented vacation trip but if I played my cards right there might be some time to activate parks in both Oregon and Washington.

Studying the POTA map, I found Row River National Recreation Trail US-10009 not far off I-5 near Cottage Grove, Oregon, about an hours drive north from where we had stopped the first night.

Row River Trail is a BLM unit maintained with help from the Army Corps of Engineers that offers miles of level recreation trail along the shores of Dorena Lake.

Row River feeds into Dorena Lake at the east end and continues past the dam at the west end of the lake.

For radio accessory management I’ve been testing out a new toolbox solution from Harbor Freight. The lid includes a clear plastic cover that snaps closed over several compartments in which you can store adapters, antenna bits, patch cords etc.

An inside tray holds coax and antenna wires, while the main box can be used for bulkier items, like spare LiFePO4 battery backs, arborist throw kit and such. The main box plastic is a little thin, which makes it a challenge to get the lid to align and snap closed properly, but then again it was 12 bucks at Harbor Freight.

It turns out I drove farther up the road past Dorena Lake than was necessary and where I ended up activating from actually had some overhead power lines cutting through the trees not far from the picnic table that had sun.

I definitely needed to keep my antenna and lines well clear of these wires and I hoped they wouldn’t be a source of noise.

I deployed a 20 meter EFHW on a Sparkplug Gear 64:1 unun, an antenna system I hadn’t used in quite a while. Although I had scheduled the activation from the hotel earlier in the morning, I used Sotamāt via the Garmin InReach Mini to make my spot certain as there was no cell service in the canyon.

The springtime morning in the Oregon countryside was bright blue with temperatures is the 70s. I can imagine it getting really toasty here in the summertime.

After about an hour, I’d logged 10 contacts needed for a complete activation. One of the challenges a QRPer faces when doing POTA midmorning on a weekday is the relative lack of hunters. You’re out playing radio while everyone else is at work!

Since we were “on the road” we didn’t linger any longer than necessary. Besides, it was well past time for my first Dutch Bros coffee of the day!

While I very much wanted to get an activation from Dash Point State Park on the shores of Puget Sound, my family and travel schedule simply did not leave enough time.

On the return trip, back in California, I again pulled off I-5, this time at Castle Creek Drive going southbound just past Dunsmuir. Castle Crags State Park US-1135 is easily accessed from this exit.

To get a little bit of elevation I drove through the park to the vista point parking area. However the crags themselves are not visible from here, you need to hike out a trail for another 1/4 mile to catch a view of them.

I wasn’t in the mood to carry my radio kit to the viewing area and since both my traveling companion and myself were a bit under the weather, I went for an expedited setup on the nearest picnic table.

Being relatively close to the highway still, I had adequate cell service so the Garmin InReach was just used as a real time clock while I logged 10 QSOs split between 15m and 20m.

Again, once the 10 contact minimum was achieved, I went QRT and we get back on the road for the final several hours drive back to home in San Francisco. I hope to get back to Washington later this summer with a better possibility of picking up a POTA activation while there.

72 de W6CSN

My wife and I headed to our favorite park, Beavertail (US-2868) on Conanicut Island, RI,  to watch the Eclipse this afternoon.  We were too far to the east to enjoy totality, but we figured it would be fun to see 91% of the sun occluded.  The weather sort of cooperated, with thin high wispy clouds and a temperature in the low 50s.  But I didn’t quite plan on the stiff breeze blowing right off the water into our faces – I was shivering, especially my hands.

I figured that I could use this as an opportunity to try out my Elecraft KH1 and it’s built-in 41-inch whip antenna at a park.  Despite my trembling fingers, I managed to make ten QSOs between 2:15 and 3:09 PM, all of which were during part of the eclipse.  I was actually pleasantly surprised  that folks could even hear me, but they did with a few fills required and signal reports ranging from 539 to 599.  That completes another of my goals for 2024, by the way.

 

 

 

Mount Tamalpais is a 2,571 foot landmark situated above Marin County in California’s coastal mountain range. Known locally as Mt. Tam, the mountain has been a refuge from busy city life in San Francisco for more than a hundred years. The Coast Miwok people, who lived around the mountain prior to European settlement of the Bay region, gave the mountain its name which roughly translates to “coast mountain.”

Earlier this year, in March 2024, it was my intention to activate Mt Tamalpais State Park (US-1178), however foul weather prevented me. Today the mountain was more inviting with lots of blue skies and mountainside grasses still green from Spring rains.

Just off West Ridgecrest Boulevard there is a picnic area set on a forested hilltop that offers a little elevation and tables to set up a field radio station. Though I had a 20 meter EFHW antenna, it seems the arborist throw line didn’t make it into the kit, so those good looking trees would not be able to support my antenna today.

Plan B for the antenna was a ground mounted vertical on a tripod. Winds were fairly light, and the trees surrounding the site offered some shelter to help keep the 17 foot telescoping whip from toppling over.

I’d forgotten how difficult the vertical antenna can be to tune up over the rocky, low conductivity ground on the mountain. In fact, without an antenna analyzer I was really having a hard time getting the MFJ whip to tune up. Eventually, I switched out the whip for the Gabil GRA-7350T loaded whip vertical which gave me better control over the tuning.

Up to this point, I’d taken the QMX radio on several POTA activations conducted from my vehicle at the Presidio of San Francisco National Historic Site (US-7889) but this would be the first time it saw use in the proper out of doors environment.

Knowing that cell service can be very spotty up on Mt. Tam I scheduled the activation ahead of time on pota.app. I was beginning to think the RBN was not going to pick me up so I took advantage of Sotamat to spot the activation using the Garmin inReach service.

The QMX performed well and after about an hour of operating, the activation was complete with a total of 13 QSOs spread across 20m, 17m, 15m, and 12m. I would have moved up to give 28 Mhz a try but signals weren’t all that great and it was starting to get a little chilly.

The wooded hillsides and grassy meadows of Mt. Tam are home to deer, elusive mountain lions, soaring hawks, and even wild turkeys. The rocky outcrops of Serpentine provide ample opportunity for a multitude of lizards to warm themselves in the strengthening springtime sun.

Here a single California Poppy, the official State flower, thrives in a crevice of Serpentine, the official State rock.

Mount Tamalpais offers colorful and surprising vistas of San Francisco and the Bay Area.

Ham Radio With K0PIR

My Parks On The Air activation of K-7389 in Florida was a wonderful and relaxing experience. After HamCation I had some time to activate a few parks and capture some video for publishing on YouTube. The first of such videos...

The post Exploring Florida’s Natural Beauty: Parks On The Air K-7389 Activation appeared first on Ham Radio with K0PIR - Icom 7300 and 7610 SDR Transceivers and now Elecraft!.

Looking at reports from other activators, it appeared that the approaches to the summit of Bald Hill in Marin County were steep, steeper, and steepest. In the hopes of starting the hike with as much elevation gain as possible already behind us, I chose the route that starts at Crest Road in Fairfax.

The information sign for Bald Hill Open Space Preserve stands just past the locked gate where Crest Road becomes Crest Fire Road. There is enough space for two cars to park at the turnaround before the gate.

About a half mile from the gate you come to the spot where the Google Maps pin for is dropped for Sky Ranch Open Space Preserve. The trail system intertwines through both Sky Ranch OSP and Bald Hill OSP, and with the names of both locations sprinkled around on different bits of signage it can get a little confusing as to which preserve you are in. But it doesn’t matter much, just go “up” and you’ll find the summit.

My hiking buddy used an app on her phone to collect some stats on our ascent to the summit of Baldy. From the trailhead, where the equestrian area is, the fire road goes steeply up and over a knoll to where it joins the Worn Spring fire road.

I recommend to take the Sky Ranch trail from the trailhead. This skirts around the eastern side of the knoll and avoids the steep elevation gain, much of which you give right back on the other side. We took this trail on the return leg rather than climbing straight over the knoll again.

The fire road to the summit is a steep climb but offers enough level spots where you can take a rest, hydrate, and catch your breath while watching other much more fit people run right past on their way up the hill!

The broad summit and activation zone offers panoramic views of the northern part of the Bay Area, but nothing in the way of antenna supports, so be prepared to supply your own.

With the GRA-3750T vertical antenna and the Mountaintopper MTR-4B on 20 meters I collected 15 QSOs within 20 minutes.

The first call was from K6EL a few miles north on Loma Alta W6/NC-350. The familiar duo of W0MNA and W0ERI checked in from Kansas and WU7H and WW7D were on W7W/CW-068 in Washington state.

After securing the HF operations and a successful activation I gave 2 meters a try. A pair of QSOs on FM was enough before heading back down the hill.

From Bald Hill there are views of Mt. Tam, San Francisco, southern Marin and Bay Area, including Mt. Diablo to the southeast.

73 de W6CSN

It’s been a stormy past several days here in Northern California, but if anything, the weather only amplifies my motivation to go outside and get on the air.

Rather than do a separate writeup for each, this post is a roundup of my last four POTA activations, from Friday February 2nd through Sunday, the 4th.

Thursday and Friday had been wet, with one storm in a series moving across the Bay Area. However, by Friday evening the cold front had passed and there was a break in the rain. This was a perfect opportunity to try an after work activation at the Presidio of SF (K-7889).

I hadn’t used the QCX-Mini in a while, and this activation reminded me why. I believe what is happening is that being so close to the antenna, RF interference causes clicking while keying, nearly to the point of distraction. I need to experiment with RF chokes on the key and audio lines to see if that improves the situation.

Fed up with the RFI on the QCX-Mini, I switched over to the MTR-4B which doesn’t seem to suffer the same issue. I wrapped up the activation after netting 21 QSOs in the cold west wind.

The next bout of rain wasn’t due to arrive until later Saturday afternoon. This was a change in the forecast that subsequently altered my plan to stay in Saturday soldering on my QMX Hi-Bander project.

Initially I went to Fort Point (K-0819) in the hopes of changing it up from my usual activation park but there were just too many people there. So seeking relief from crowds, I crossed the Golden Gate Bridge and went up on the slopes of Mt. Tamalpais.

I parked at Trojan Point at an elevation of approximately 1800 feet. See this post for more views from this location. The temperature was in the mid-40s, which is cold for us coastal Californians. Besides, the winds were picking up ahead of the next storm so I operated from the comfort of my vehicle using the Gabil 7350T base loaded vertical antenna on 15m and 20m.

This activation used the FT-818 and yielded 23 contacts, including JH1MXV from northwest of Tokyo, Japan coming in fairly strong on 21 MHz.

Driving back to San Francisco takes me right through the Presidio of SF (K-7889) and noticing that it was after 00:00 UTC, I made the last second decision to divert to East Beach to see if I could work in another activation before the anticipated rain.

At my usual spot for activating this park, it took only moments to raise the MFJ-1979 20m quarter wave and do a quick deployment of the MTR-4B on the trunk of the car. The wind was picking up, but not nearly as strong as it was up on the mountain.

After seven QSOs, the skies began spitting raindrops, this was going to be close! I closed the cover of the Maxpedition pouch to protect the radio and battery while the Bencher paddles could tolerate a little bit of moisture.

I was happy to have a Rite-In-The-Rain notepad for logging, because now I was certainly writing in the rain! Three more contacts and the activation was concluded with a hunt of Jim, WB0RLJ, in K-4011.

---

The next big storm blew in overnight Saturday and into Sunday morning with heavy rain and high winds. It seemed almost certain that I would not be heading out today. However by the late afternoon, the barometer, which had bottomed out at 991 millibars, started to check back up and some blue sky appeared between the cumulus clouds. The winds however were still running high.

Seeing as the rain had stopped for the moment, I quickly put together a plan for K-7889 to operate from the car with the shorter vertical antenna on a roof magmount. Driving through the Presidio of SF there was lots of debris and even detours because of downed trees.

Once down at East Beach, I got straight to work with the FT-818 on 20 meters. The winds continued to blow unabated while I worked stations from the southern plains through the Pacific northwest. About halfway through this operation, another wave of rainfall quickly moved in, as such I was happy to be in the dry and warm confines of my vehicle.

I have to put in a good word about the Gabil 7350T antenna. While it is a short vertical, it tunes easily and performs well on the higher bands. I don’t have an exact count, but this antenna has held up over many dozens of activations and in some really adverse conditions.

For this final activation of the weekend, 15 contacts was enough, including two Park-to-Park QSOs, K7EVM at Capitol State Forest K-5567 and KH6RF at Kaloko-Honokohau NHP K-0739 on the Big Island of Hawaii.

It is not uncommon for California to experience a spell of warm weather in late January or February with temperatures rising into the mid-60s °F. This typically occurs when high barometric pressure builds over the eastern Pacific and into the Pacific Northwest, causing an offshore wind flow over California.

With the warm temperatures came a wonderful display of altocumulus clouds throughout the day. In fact, the real reason this activation gets a blog post is to show some pictures of the pretty clouds!

Enough about the weather, let’s talk radio. The FT-818 has been getting a lot of use recently. While it does lack a built-in antenna “tuner” and CW message memory, it’s the closest I have to a shack-in-a-box. And, it’s the only portable HF radio I presently have that goes above 20 meters.

Collapsing the lower three and a half sections of the MFJ-1979 telescoping whip, I am able to get a good match on 15 meters, which is where I started this activation. By operating on 21MHz late in the day, my hope was to get some Pacific-rim DX as well as the more likely stateside QSOs. The strategy paid off with three Japanese stations responding to my CQ POTA calls. Sigs weren’t strong, but with some persistence we were able to complete the required exchange of callsigns.

Next, I tuned the radio to 20 meters and fully extended the whip antenna for a one-to-one match. The N0NBH space weather report on qrz.com showed the geomagnetic field to be in “unsettled” territory and QRN on 14 megahertz was getting up to S5. Nevertheless, propagation was still quite good with calls from all over the USA, Canada and Alaska.

With the sun dipping below the western bluffs of the Presidio of San Francisco, I sent a final QRT after one last call from N4GO in Kentucky. El Niño winters can bring a mixed bag of interesting weather to Northern California and today’s “t-shirt” weather was perfect for getting out for a little outdoor amateur radio.

73 de W6CSN

Today’s activation of the Presidio of San Francisco National Historic Site K-7889 was pretty standard for a mid-winter POTA outing. Normally I wouldn’t bother to write it up on this blog. After coming here 72 times there is not much new to say about it. Nevertheless, maybe somebody will find value in this field report.

Even though the weather was dry this afternoon, the radio operating began in the car where I used the FT-818 to net 14 contacts on 17 meters. I must admit being warm while doing a POTA activation is not bad!

After a while the calls started to dry up so I extended the antenna fully to get on 20 meters, but the best SWR I could get was 3:1. I suppose the lack of good bonding of the coax shield to the car body, which I’ve read about in other blog posts on qrper.com, was responsible for the less than optimal antenna match.

After taking down the badly matched roof mount antenna , I flipped the car around and backed into the parking space to set up my usual 20 meter station on the trunk lid with the antenna clamped to a steel post.

At the same time I switched radios to the Mountaintopper MTR-4B. Previously the current draw of the FT-818 had dropped the battery voltage to 12.6v, but with the lighter load of the MTR, the voltage rebounded above 13v. The MTR-4b is designed to accept 13v, something the other radios in the MTR series are not recommended for. However the SWR in this antenna configuration was 1.0 to 1 so I felt okay to run the radio at the full 5 watts with the higher voltage.

Unfortunately 20 meters wasn’t performing all that great, yielding a mere four contacts. The POTA website showed several JA’s activating parks on 40 meters, so I added the Wolf River coil to the base of the antenna in hopes of hearing them. Alas, no copy, so I put out a few CQ POTA calls of my own on 7.062 MHz. W6OOD responded from Southern California, but my report was not particularly strong. And, with the light fading I decided to call it a day.

Activation #72 netted a total of 19 QSOs on three different bands, coast-to-coast. Not bad for an unremarkable Friday afternoon ham radio outing.

New England weather has been fairly mild the last few winters, especially in December and early January.  The weather gods indicated mostly sunny skies and temps around 40 for New Year’s Day, so it seemed like an excellent time to head to a new (for me) park: Camp Cronin Recreational Area (K-10542), which is on the southern coast of RI, near the Point Judith Lighthouse.

I decided to run SSB to make logging a bit easier (juggling a laptop and a paddle for CW is always not-fun).  Despite some rather strong ignition noise from other cars around me (running their heat, no doubt), I was able to make 26 contacts rather quickly.  My wife walked our dog Jaclyn while I was on the air and took a nice photo of the car with the full size 1/4 wave vertical for 20-meters:

That’s the Atlantic Ocean about 10 feet in front of the car, looking toward Africa.

The new year means time off work and the opportunity to overindulge in amateur radio activities. With no antenna installed presently at my home QTH, all of my operating must be done in the field.

For January 1st, 2024 I was able to complete two POTA activations at local parks. The first was actually on December 31st local time but was a New Year’s activation nonetheless as the calendar already turned in Greenwich.

The Presidio of San Francisco National Historic Site K-7889 is the park in my “backyard” where I rolled in just after 00 UTC. It didn’t occur to me to take a lot of pictures of the radio action but there was a nice sunset.

A total of 16 QSOs made it into the log, one was a duplicate and it seems two of the other contacts were “busted” as they didn’t return anything from lookup in qrz.com. I didn’t have any difficulty copying the calls and neither operator corrected me so I can only log what I copied.

Advice to hunters: don’t be afraid to correct the activator if you have any doubt as to whether they copied your call correctly, even if you are on the slower side with CW or the activator is working fast. POTA is not a contest and I’d rather take the time to log your call correctly than end up with a busted contact and you not getting hunter credit for the QSO.

The next morning we got up early for the traditional New Year’s Day hike. In the mediterranean climate of central California, there are good odds that January 1st weather will be clear and bright, if not overly warm.

We headed to the Tennessee Valley which cuts through the Marin Headlands out to a small beach of the same name. All of this area is within the expansive boundaries of the Golden Gate National Recreation Area K-0647.

The problem with being in a valley is the surrounding terrain is not exactly conducive to QRP radio operating. So we began to hike up one of the “roads” up toward Coyote Ridge. These trails are wide enough for a vehicle to pass but most parts are so steep that only a serious off-road vehicle could manage it. Besides, the gate is locked at the trailhead parking area.

After 800 feet of elevation gain I was not at the top of the Coyote Ridge but high enough to have a radio view to the east. The hike this far had been short, but quite strenuous so I was happy to find a flat-ish spot off the trail to setup a tripod and antenna.

I ran the RG-316 coax 25 feet from the antenna to the operating position where an embankment offered perfect place to sit by the side of the trail. While I worked for about 45 minutes to get ten contacts on 20 meters my hiking companion continued up the steep trail to Coyote Ridge, from which she assured me that the views were excellent.

Again, between the hiking and scratching for QSOs I neglected to take pictures of the radio setup. But picture in your mind the red Mountaintopper MTR-4B with N0SA Sota paddles and black 3ah 12v power source and that was the station.

As soon as the activation was complete, I packed up the station and we booked it back down the hill as we had a some errands to run before a family get-together in the afternoon.

Happy New Year and 73,

W6CSN

It’s late December and one of a series of winter storms is driving into northern and central California. The previous day, my plans for a combined Summits On The Air and Parks On The Air activation fell apart due to weather. Today most of the UTC day had passed with only light drizzle, and itching to get on the air, I hatched a plan for an activation at my nearby park reference K-7889, the Presidio of San Francisco.

Typically when activating at this park from the “East Beach” area, I will back into a parking space, setup the radio on the trunk lid and run the coax a short distance to a 17 foot vertical telescoping whip antenna which is clamped to a short steel post.

Today however, I chose to operate from inside the vehicle so both myself and the radio equipment would stay dry. Not wanting to leave the coax unsupervised where someone could trip over it, I deployed the Gabil GRA-7350T antenna with a triple mag-mount on the roof of the car.

The GRA antenna is a short, loaded vertical with the whip portion maxing out at about 8 feet in length. It works well on 20 meters, but it’s less of a compromise on higher frequencies. On 18 MHz, only a small amount of the loading coil is needed to achieve an acceptable SWR, so with the bands in pretty good shape I brought the Yaesu FT-818 so I could get on 17 meters.

There weren’t many spots for 17m on the POTA web site, but I posted my spot anyway and started calling CQ. It wasn’t long before KX0Y responded, followed by more hunters from across North America and Alaska. The Golden Gate Bridge was visible from my vantage point at the start of the activation, but as the rain intensified the bridge became enshrouded by the incoming weather front.

With 00 UTC approaching, the rain now coming down harder, and 13 QSOs in the log I called QRT. Rather than carefully stowing the antenna and mag-mount, I simply broke it down as quickly as possible and tossed it all the back seat since I would have to bring it inside to dry anyway.

The following equipment was used in this activation:

• Yaesu FT-818 QRP transceiver
• Gabil GRA-7350T antenna system
• Triple magnet antenna mount
• CW Morse machined aluminum pocket paddles
• Rite In The Rain spiral notepad logbook
• Snazzy Zebra mechanical pencil with “shock absorber.”

Thanks to all the hunters that responded and made the activation a success.

73 de W6CSN.