This event happens seasonally, on the 3rd full weekend of the month (Saturday & Sunday UTC). These are ‘activity weekends’ where the main purpose is to get out in the parks, and have as much fun as possible.
Winter – 3rd Full Weekend of January. January 18-19, 2025
Spring – 3rd Full Weekend of April. April 19-20, 2025
Summer – 3rd Full Weekend of July. July 19-20, 2025
Autumn – 3rd Full Weekend of October. October 19-20, 2024
Hope to get you in my Logs during the upcoming event….
This event happens seasonally, on the 3rd full weekend of the month (Saturday & Sunday UTC). These are ‘activity weekends’ where the main purpose is to get out in the parks, and have as much fun as possible.
Winter – 3rd Full Weekend of January. January 18-19, 2025
Spring – 3rd Full Weekend of April. April 19-20, 2025
Summer – 3rd Full Weekend of July. July 19-20, 2025
Autumn – 3rd Full Weekend of October. October 19-20, 2024
Hope to get you in my Logs during the upcoming event….
Very cool. I like his description of how he found parts for this transmitter:
The power amplifier tubes needed ventilation as well as shielding; that was always a challenge because I had no good source of perforated metal. The black sheet with the round holes actually came from the cover of a car air filter that I found in the trash.
There is a lot more interesting stuff on Nathan Zelde 4Z4GE's site:
Click on the paragraphs or go to the link for a clearer view
I think the explanation of Collins'32S-3 cleanliness is due to 1) Thermatrons in the final stages and 2) Negative feedback to take down any IMD products that might appear due to non-linearities in the finals.
There is nothing magical in that technique. Heck, we could homebrew that today. We could build HDR stations (perhaps transistor-tube hybrids) that would be cleaner than their commercial SDR cousins.
Many thanks to Rod (VA3MZD) for sharing the following guest post: Operating POTA from the interior of Quetico Provincial Park CA-0359 with a (tr)uSDX By Rod Murray (VA3MZD) In a previous guest post here on QRPer I gave a brief history of my introduction to Ham radio and specifically POTA and my experiences activating local … Continue reading Navigating Quetico: Rod’s POTA Adventure with the (tr)uSDX→
Here is a good (and very recent) article on IMD ("splatter") produced in transmitters. The focus is on VHF, but much of this is relevant to HF operators. I found the footnotes on the ARRL "Clean Signal Initiative" to be worrisome. They seem to just be assuming that all ham operators will be using commercial gear, and the "OEM" needs to be made to meet certain standards. This seems to leave the homebrewer out in the cold. I can see where someday soon, the "standards" will exceed the capability of analog homebrewers. That would be bad.
The role that signal strength plays in the perception of "splatter" is often misunderstood by the "waterfall police." We often we hear some irate waterfall policeman screaming that, "You are 40 over and far too wide." Here is a good quote from the article on this point:
"If you have a calibrated spectrum display (as many SDR’s are these days), you can directly measure the
level difference in dB. If it is 30 dB or more, then it could be an acceptably “clean signal”, even if it is
bothersome. Most ham voice communication is conducted with less than 30 dB signal/noise, and in that
case the unwanted IMD is buried in the noise."
And even in a low noise environment, if the signal is 40 db over S9. that would mean the signal PEP is at -33dbm. If the IMD products are 46 db down from the signal peak, that means your IMD products are -79 dbm. That is S-8! That signal will look quite wide in the waterfall, but it would be within FCC specs, right? The problem here is not so much distortion, as signal strength. And let's remember that "legal limit" is usually a misnomer: FCC regs require hams to use the minimum power necessary, not 1.5 kW on every single QSO.
I think the point I was trying to make about the influence of signal strength is here:
Referring to fig. 1C, note the high level of rf at the 3rd order level - typically 36-dB down. Consequently, there will be rf energy outside the normal 23 kHz passband that will be only 36-dB below the carrier peaks, or about one four-thousandth of the peak power. Not bad if the station is only 25-30 dB out of the noise, but very objectionable if it's 40-60 dB out of the noise.
I think it is supposed to read "2-3 kHz passband" vice "23kHz passband."
I guess the point is that QRP levels of operation can hide a host of ills. IMD ills. This makes me wonder about the cleanliness of my own signals. I will have to do some more careful measurements.
Remember yesterday when I mentioned the latest addition to my POTA setup, the Xiegu 5105 QRP rig….
Well this morning I decided to test it out and see how much work I would have to do with setting the parameters such as mic gain, processor, to make it sound like me… I was also testing out my EARCHI 9:1 unun with a 29.5 foot random wire to see how it would play with the built in AT of the 5105.
I figured I might as well do the testing at a POTA location just in case I was able to turn the test into an activation.
For this I chose Fort Frontenac POTA CA-5303. Its fairly easy to get there via the Kingston Transit system and its also close to downtown and all the amenities I might need. In the North East corner of the picture you will notice some white lines on the ground.
They are actually the walls of what’s left of that part of the Fort. Also the only parts of the Historic Site that is open to the public.
I leaned my MFJ 33 foot mast (supporting the 9:1 and wire in the vertical configuration) up against the tree.
And then ran the COAX over to the remains of the wall and set up my radio there and started operating.
My first contact was on 7.255 with the NCS of the ECARS net. He did hear me and considering I was QRP I was pleased. He did tell me that my audio seemed hot as if I was overdriving things. Lowering my voice seemed to help.
After that I looked at POTA Spots and managed to get W2IDG and VE3FI into the log from their parks and then finished up with the NCS of the MidCars net on 7.258.. All contacts were made on 40m SSB. I tried 20 SSB and was hearing lots of stations including a POTA Activation in VO1 but no luck breaking any of the pileups.
Then I figured it was time to get home and try to re configure the radio to my liking… I turned off the Speech Processor and lowered the Mic Gain from 60 to 40. Over the next few days I will get out again and see what else I have to do to get things sounding right.
Remember yesterday when I mentioned the latest addition to my POTA setup, the Xiegu 5105 QRP rig….
Well this morning I decided to test it out and see how much work I would have to do with setting the parameters such as mic gain, processor, to make it sound like me… I was also testing out my EARCHI 9:1 unun with a 29.5 foot random wire to see how it would play with the built in AT of the 5105.
I figured I might as well do the testing at a POTA location just in case I was able to turn the test into an activation.
For this I chose Fort Frontenac POTA CA-5303. Its fairly easy to get there via the Kingston Transit system and its also close to downtown and all the amenities I might need. In the North East corner of the picture you will notice some white lines on the ground.
They are actually the walls of what’s left of that part of the Fort. Also the only parts of the Historic Site that is open to the public.
I leaned my MFJ 33 foot mast (supporting the 9:1 and wire in the vertical configuration) up against the tree.
And then ran the COAX over to the remains of the wall and set up my radio there and started operating.
My first contact was on 7.255 with the NCS of the ECARS net. He did hear me and considering I was QRP I was pleased. He did tell me that my audio seemed hot as if I was overdriving things. Lowering my voice seemed to help.
After that I looked at POTA Spots and managed to get W2IDG and VE3FI into the log from their parks and then finished up with the NCS of the MidCars net on 7.258.. All contacts were made on 40m SSB. I tried 20 SSB and was hearing lots of stations including a POTA Activation in VO1 but no luck breaking any of the pileups.
Then I figured it was time to get home and try to re configure the radio to my liking… I turned off the Speech Processor and lowered the Mic Gain from 60 to 40. Over the next few days I will get out again and see what else I have to do to get things sounding right.
Due to some family stuff I have to give up on my attempts to reach the Bonus Station GB13COL in the 13 colonies event this year.
I did manage to get all 13 stations in the log along with the PA Bonus station and the French (TM13COL) bonus station.Most were SSB but I did get a few in the log using CW.
I did hear GB13COL on SSB and CW but had no luck breaking the pileups in either mode.
The people who could not understand the concept of “Split” added to the problems and the DX Cops trying to get their point across by adding to the QRM with the words “UP UP” over and over.
That really did not help my popgun station hear what I was trying to listen for.
So with 90 minutes left to go…. Its time to cut my losses and run….but for the most part if was fun. Thanks for a job well do goes out the the Event Organisers along with the station operators of the stations involved in the event.
Due to some family stuff I have to give up on my attempts to reach the Bonus Station GB13COL in the 13 colonies event this year.
I did manage to get all 13 stations in the log along with the PA Bonus station and the French (TM13COL) bonus station.Most were SSB but I did get a few in the log using CW.
I did hear GB13COL on SSB and CW but had no luck breaking the pileups in either mode.
The people who could not understand the concept of “Split” added to the problems and the DX Cops trying to get their point across by adding to the QRM with the words “UP UP” over and over.
That really did not help my popgun station hear what I was trying to listen for.
So with 90 minutes left to go…. Its time to cut my losses and run….but for the most part if was fun. Thanks for a job well do goes out the the Event Organisers along with the station operators of the stations involved in the event.
Many thanks to Christian (IX1CKN) who shares the following field report: Friedrichshafen: POTA Across Borders by Christian (IX1CKN) The Friedricshafen fair is one of the most interesting events for its social aspects, where you can finally put a face to colleagues whose voices you’ve only ever heard. Among the various OM (radio amateurs) I met this year … Continue reading Friedrichshafen: Christian and Andrea’s Multi-Country POTA Rove→
by Vince (VE6LK) Field Day 2024 started out with the best of plans to be spent with the best of friends and ended up totally different – and, unexpectedly, I had a hoot! With my carefully made plan behind me, my new last-minute plan was to run solo for Field Day in the backcountry of … Continue reading Experimenting during Field Day 2024→
On Tuesday, June 18, 2024, I needed to make a morning trip to Hickory, NC, to take care of some family business and visit my father. I started my day early because I also wanted to be back in the Asheville area by noon. Some quick calculations over morning coffee and I decided I had … Continue reading Xiegu X6200 SSB Field Test: A Morning POTA Activation at Lake James→
Anyone who has been with me for awhile knows that every now and again “Murphy” of Murphy’s Law fame comes for a visit.
Things here have been going fairly well (Ham Radio wise) recently. I have been able to some contacts (mostly 20m SSB) during the daytime and also in the evenings (mostly 40m SSB) and considering the band conditions I think that’s pretty good.
But (and you know there had to be a “but”!
After making some evening 40m ssb contacts last night I shut off the power supply and left the shack. I came back to the shack and turned on the power supply and the radio would not turn on.
I did a quick check and the power supply now had an output of 4v dc. Not what I was expecting as before I shut it down it was steady at 13.5v dc which is normal for this unit.
I then took the cover off and could not smell the “magic smoke” and there was no visible issues on the board itself. No burn marks on the board, everything attached and no signs of any thing out of the ordinary.
I did have a backup PS so I’m still on the air with a 25 amp unit rather than the 30 amp unit that now is a paperweight.
The replacement from “The Toronto Toystore” will set me back around $220.00 after shipping/taxes, so it won’t break the bank and they have one in stock so “fingers crossed”.
So, this morning I look out into my backyard and notice the counterweight attached to the end of my “Stealthy Inverted L” is laying on the ground. A quick check found that the wire itself was intact but…. (yup but again) the wire had slipped off on of the branches that support the horizontal section of the wire. This does happen every now and again so…. 30 minutes later I’m back on the air.
The plan now is to see if the band comes to life (the numbers are looking good) and I can get (more than) a few contacts in the log.
.
Ending on a positive note I was able to contact VE3FI Bill as he activated POTA CA-2376 as part of his cross Canada tour. I guess the antenna is working after all that.
This solution has worked incredibly well from the outset and over time I’ve added extra functionality that I’ve found to be useful to enhance the overall setup.
The latest addition to the ground station solution is a Sennheiser Headset that I picked up for just £56 on Amazon (Much cheaper than the Heil equivalents at the HAM stores!) and have found it to be excellent. The audio quality from both the mic and the headphones is extremely good whilst being light and comfortable to wear for extended periods.
M0AWS – Sennheiser SC 165 Headset
To incorporate this into the ground station the headset is connected to my Kubuntu PC and the audio chain to the IC-705 is sent wirelessly using the latest version of WFView. This works extremely well. The receive audio comes directly from the GQRX SDR software to the headphones so that I have a full duplex headset combination.
Audio routing is done via pulse audio on the Kubuntu PC and is very easy to setup.
Since I no longer have a mic connected to the IC-705 directly I found that I needed a way to operate the PTT wirelessly and this is where the latest addition to my NodeRed QO-100 Dashboard comes in.
Adding a little functionality to the NodeRed flow I was able to create a button that toggles the IC-705 PTT state on and off giving me the ability to easily switch between receive and transmit using a simple XMLRPC node without the need for a physical PTT button.
M0AWS – Additional NodeRed PTT Flow
The PTT state and PTT button colour change is handled by the Toggle PTT function node shown in the above flow. The code to do this is relatively simple as shown below.
M0AWS – NodeRed Toggle PTT Function to change button colour
The entire QO-100 Dashboard flow has grown somewhat from it’s initial conception but, it provides all the functionality that I require to operate a full duplex station on the QO-100 satellite.
M0AWS – NodeRed QO-100 Dashboard complete flow
This simple but, effective PTT solution works great and leaves me hands free whilst talking on the satellite or the HF bands when using the IC-705. This also means that when using my IC-705 it only requires the coax to be connected, everything else is done via Wifi keeping things nice and tidy in the radio shack.
M0AWS – Updated NodeRed QO-100 Dashboard with PTT button
The image above shows the QO-100 ground station in receive cycle with the RX/TX VFO’s in split mode as the DX station was slightly off frequency to me. The PTT button goes red when in TX mode just like the split button shown above for visual reference.
As you can probably tell, I’m a huge fan of NodeRed and have put together quite a few projects using it, including my HF Bands Live Monitoring web page.
Since I’ve been using my Icom IC-705 on the QO-100 satellite I’ve been getting no end of unsolicited great audio reports with one Op even saying I have the best audio he’s ever heard on the satellite.
Most people are surprised when I tell them that I am using the stock fist mic that comes with the radio. It’s nothing special, in fact it’s rather cheap and plastic, not particularly good quality however, it does seem to have a good sounding mic insert.
The other great thing about the IC-705 is that it has a two channel parametric equaliser built into the radio. Many people don’t realise this and miss out on the massive improvement they can make to their transmitted audio with just a few simple adjustments.
The stock fist mic has a very flat response across the audio frequency range out of the box and doesn’t sound particularly inspiring. Many see this as a negative and often just replace the mic with either a headset (probably from Heil), a boom mic (again probably from Heil) or another, better quality fist mic. All of these options cost varying amounts of money when in reality none of them are necessary.
Starting from a flat audio response is actually a good thing as it makes the equaliser adjustments more pronounced, making it easier to adjust the settings to suit your voice.
We all have different voices but, there is one thing that is pretty much the same for everyone and that’s the frequency range in which the articulation of the words and sounds we make can be found. It’s this part of the voice that is often lacking when we struggle to understand what the DX station is saying.
It’s become common place on the HAM bands these days for stations to boost the bass frequencies and reduce the mid and high frequencies with the net result of a horrible bass ringing sound and muddy mid range often making it very difficult to understand what is being said.
Having spent some considerable time watching the great videos on audio from the late Bob Heil, K9EID it’s clear that the most important frequencies to enhance are those around 2.5khz as this is where all the articulation is in the human voice.
To this end I set about setting up the audio on my IC-705 QRP radio so that my voice sounded such that it is easy to comprehend even in the most difficult of situations on air. This doesn’t mean that it has to be very harsh and overly bright, quite the opposite in that to be heard clearly in all conditions on air one’s audio needs to be balanced across the frequency range with an enhancement in the 2.5Khz frequency range.
M0AWS IC-705 Transmit audio settings – part 1
To reduce the unwanted, muddy bass the first thing to do is change the transmit bandwidth for the “Wide” setting to 200-2900Hz. This will cut off the bottom 100Hz from the voice reducing the overall bass output from the standard fist mic that comes with the radio. This will ensure a 2700Hz wide SSB signal, the recommended max for QO-100 operations and the preferred bandwidth on the HF bands.
On top of this I made a further reduction of 2dB on the TX Bass setting to help balance out the overall audio response of the mic insert.
Next I set about enhancing the higher frequency response of the mic insert and found that it required an increase of 4dB to bring out the articulation of my voice. This enhanced my audio considerably compared to the standard output from the fist mic and improved the intelligibility of my voice considerably, especially in difficult band conditions.
To complete the setup I set the compression to 3 and mic gain to 35 so that the overall drive level is increased slightly giving a greater average output from the radio.
M0AWS IC-705 Audio Settings – part 2
Once I’d got the audio setup correctly I enabled the configuration by setting the Transmit Bandwidth (TBW) to the “Wide” config in the IC-705 Function menu so that the correct settings were made active.
Ever since making these relatively easy changes I have had no end of unsolicited great audio reports from stations asking me what mic I am using and how I’ve managed to get such good audio from the IC-705. Many are surprised that I am using the OEM fist mic that comes with the radio and I’m sure there are those who don’t believe me!
Of course all voices are slightly different and these settings may not be perfect for your voice but, all those that have tried these settings have told me that their audio sounds better than ever and that DX stations often comment on how good their audio is.
I also went through the same exercise with my Yaesu FTDX10 with it’s standard fist mic and again achieved excellent results with it’s 3 channel parametric equaliser. I’ll go through the somewhat more complicated setup for the FTDX10 in another article soon.
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