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Today — 15 August 2024Ham Radio Blogs

New RTTY contest – Friday 4th October 2024

By: g6nhu
15 August 2024 at 17:04

I have been emailed details of a new RTTY contest which will run for the first time this year on Friday 4th October 2024. It’s scheduled for the first Friday of October each year going forward. It’s called the URC DX RTTY Contest and the rules are pretty standard in that everyone works everyone. The […]

The post New RTTY contest – Friday 4th October 2024 first appeared on QSO365.

Why did I give up the valve collection?

By: M0RVB
15 August 2024 at 16:31

Some of you may remember that I used to collect valves. I started collecting when I was around 6 years old, although back then it was more to impress friends than collect. An old directly heated valve plus a Lego battery box lit my desk up at primary school. I did not start collecting in earnest until the 1990’s and launched my first online valve museum in 1999. Since then the collection grew in several directions at once, including German WW2 types, Russian Cold War types and British military and civilian types. There were specials from all over the world as well including a few Japanese WW2 ones. Valves ranged from tiny little things to a RD150YB that had to live in the garage, and a 6-anode mercury arc rectifier that was equally not allowed in the house, and for good reason too. The main collection grew to over 3,000 types, many of which had duplicates, so probably 4,000 in total. And then there were boxes of valves that did not warrant adding to the collection.

And so the collection continued to expand. While on holiday in the US friend in the US was discussing collecting trends with me and another collecting friend and said he collected US antique types, others collected microwave types and, pointing at me he said I collected everything and there is nothing wrong in that. But it made me think what exactly is my interest. And so I decided to concentrate on what I found most interesting – British military types, mainly in the CV, and A, N and V military series. The collection included a number of CRTs as well and eventually took over the whole garage.

I decided then to concentrate solely on CV types and trimmed the collection to 1,500 types, again with duplicates taking the collection to over 2,000 valves. Of the remainder many were sold and many hundreds went to the National Valve Museum which was nearly as old as my own.

Eventually though three things happened. First, it was becoming increasingly difficult to find new additions. Second, the website was now seeing fewer and fewer actual hits (as opposed to search engine spiders), and, most importantly I realised it had become an obsession. Time to quit. I also came to the realisation that I had an awful lot of valves in lots of boxes and I never even looked at any once they went into a box.

So I decided to close the website and sell off anything I could, donating the remainder to the National Valve Museum. The website was essentially converted to flat HTML files with none of the database behind them and taken over by a member of the BVWS. Of course, all praise to them for doing that, but none to me for all my years of work. Par for the course. In the past 20 years I received just a handful comments thanking me for providing the photographs and information about the collection. I was somewhat surprises at the screams when I announced the website was to close. Of course, I did not make the website for that, I did it because I thought people might actually be interested, and they clearly were back at the turn of the millennium but times change.

I was fortunate that someone local took many of the CRTs and a bunch of valves as well. Of the rest, a few hundred are destined for friends in Australia, the Netherlands, Belgium and Italy but the logistics are going to be a nightmare. Several hundred have found new homes here in the UK. Of the thousands left these went to the National Valve Museum with the more mundane radio and TV types being scrapped as no-one wanted to come and get them. I am keeping many of the early magnetrons for later sale, and some of the more decorative valves for, well, decoration!

There are still several boxes and a cupboard full of valves and they are destined to be scrapped. Selling on eBay as an individual has become more and more complex over the years so I will rarely sell there. As no-one was interested in paying me a visit to take them away they will end up in the dump.

At its height the collection took over half the workshop and half the garage. Once trimmed down to the CV types it was still half the workshop. Now it is all under one bench and I have more space to set up the various tools that have been sidelined for years and actually get back to working on the house.

Hurricane Ernesto Updates

Thursday, August 15, 2024 Midday Update:

The National Hurricane Center reports that Tropical Storm Ernesto had become a Category 1 hurricane.

A hurricane warning has now been issued for Bermuda and dangerous rip currents are likely along U.S. East Coast beaches this weekend, August 17 - 18.

Bobby Graves, KB5HAV, Hurricane Watch Net Manager, reports the net’s activation plans:

Friday August 16 

  • 20 me...

Solar Cycle 25 Producing Record High Sunspot Numbers

By: Frank Donovan, W3LPL

Editor’s note: This article was written earlier in the week. The latest measurements show even higher numbers. See this week's K7RA Solar Report in The ARRL Letter for latest information. 

Record High Solar Cycle 25 Solar Maximum Sunspot Numbers Have Improved HF Propagation Since Mid-July and Possibly Bringing Worldwide 6 Meter F2 Propagation This Fall.

According to the NO...

New Products Spotlight: mAT-TUNER mAT-50 and 1500PRO Automatic Antenna Tuners (video)

15 August 2024 at 14:13

Vibroplex, which first manufactured and sold its signature Morse code “bug” key back in 1904, is the longest continually operating ham radio equipment provider on the planet, but that doesn’t mean the venerable company doesn’t have more than a few new tricks up its well-worn, rolled-up sleeves.

DX Engineering’s Rod Ehrhart, K8RR, caught up with Scott Robbins, W4PA, Vibroplex’s owner since 2009, at Dayton Hamvention 2024 to discuss the mAT-TUNER line of automatic antenna tuners, which the Knoxville, Tennessee-based company has distributed in the U.S. since 2019. Watch the video below:

Scott, W4PA, highlights two new mAT-TUNER offerings—mAT-50 Automatic Antenna Tuner and Coupler Packages and the 1500PRO Automatic Antenna Tuner, both available along with the entire mAT-TUNER lineup at DXEngineering.com.

The multipurpose, 1.8-54 MHz mAT-50 Automatic Antenna Tuner comes with either an Icom, Yaesu, or Kenwood coupler and corresponding control cable. This remote tuner has the capability of matching a variety of impedances and antennas including long-wires, dipoles, verticals, Yagis, whips, and virtually any coax-fed antenna. It features a maximum input power of 120W SSB/60W Digital.

Automatic Antenna Tuner and Coupler Package
(Image/DX Engineering)

Install the sturdy, weather-resistant tuner outside near the antenna. Then install the coupler inside near the transceiver to provide power for the tuner and control its operation. The tuner does not require a control cable between the remote tuner and coupler, making installation simple. The only required connection between the antenna tuner and coupler is one 50-ohm coaxial cable. Advanced technology employed in the tuner delivers stable performance and excellent anti-interference capabilities for convenient one-key tuning.

The mAT-50 can also be used as a universal tuner for all transceivers if a mAT-50-Y or mAT-50-M coupler is connected to an external DC power supply (not included) and a control cable is not installed. You can then operate the tuner manually.

The mAT-1500PRO Automatic Antenna Tuner is an upgraded version of the original mAT-1500 tuner. Improvements include reduced weight, high- quality housing, and additional interfaces for Yaesu, Icom, and Kenwood transceivers and their corresponding operating modes. This allows the tuner to be controlled directly from the transceiver, reducing the need for manual operation.

Module for an Automatic Antenna Tuner
(Image/DX Engineering)

In addition, two antennas can be connected simultaneously, and the corresponding buttons for switching (in receive mode) are placed on the front panel for easy access. Other features include:

  • Designed for modern transceivers with a frequency range of 1.8-54 MHz
  • Rated for up to 1,500W SSB/800W Digital
  • 16,000 memory locations
  • Fast tuning—found values for a frequency are stored in the memory, enabling adjustments as quick as 100ms
  • Loop-through of the PTT line makes it possible to loop in the power amplifier behind the tuner. The tuner interrupts the PTT line to the power amplifier during the tuning process. This avoids tuning with high power, greatly reducing the possibility of damaging the tuner relays.
  • 6 to 1,000 ohms tuning range, which corresponds to an SWR range maximum of 10:1. This allows it to match all coax-fed antennas such as a G5RV with a balun at the transition between two-wire ladder line and coax cable, but also a wideband vertical antenna designed for the rated power.

See all mAT-TUNER automatic antenna tuners and accessories at DXEngineering.com, including the MAT-Y200 for Yaesu transceivers, the MAT-705PLUS for the Icom IC-705, and the MAT-180H for select Icom and Kenwood transceivers.

The post New Products Spotlight: mAT-TUNER mAT-50 and 1500PRO Automatic Antenna Tuners (video) appeared first on OnAllBands.

ARRL Urges Protecting the Amateur Radio 902-928 MHz Band

The Federal Communications Commission (FCC) accepted for public comment a Petition for Rulemaking filed by NextNav Inc., a licensee in the 900-MHz Location and Monitoring Service (LMS), to completely reconfigure the 902-928 MHz band and replace the LMS with high-powered 5G cellular and related location services.

The FCC Notice requested comment on the effects that NextNav’s proposals would have ...

Capitulation

15 August 2024 at 12:00

An update a few days ago from the N5J team said that many callers were continuing to use an older version of WSJT-X that wasn’t compatible with the new SuperFox Hound mode that is being used. This, despite considerable pre-DXpedition press informing everyone that the software update would be required.

Apparently, complaints from enough stubborn hold outs are causing the team to capitulate on this point as they just announced:

“In response to the requests to run normal Fox Hound mode because some stations are having difficulty with the SuperFox mode, effective 00:00 UTC 16 August we will convert one of the two WSJT-X stations to the old Fox Hound method”.

I hope the real problem here is propagation related and not that radio amateurs are unable to upgrade their own software…

August 15, 2024. I get asked questions!

By: N6QW
15 August 2024 at 13:01

I get mail! Sounds like a cheesy movie title from 20 or so years ago. But I do get inquiries about some of the projects I have published or are shown on my websites or the you tube videos.

There is a recurrent theme in the emails. It goes like this -- I am new to homebrewing, I lack a lot of experience, and I saw your work finally can you help me. I respond and the next email to me is about wanting to build a 100-watt radio using an FPGA, having all bands, all modes and no bigger than a shoe box. 


Field Programable Gate Array (FPGA)


Given the many projects I have built, N6QW has never programmed or utilized an FPGA in a scratch-built rig. I can't figure out the staggering shift in going from say building a simple Direct Conversion Receiver to essentially replicating an ICOM IC7300 as a 1st project. 

Thus, I thought this may be a good time to corral some thoughts on what constitutes a good design to start a 1st homebrew project. Just because a design does not have an FPGA does not mean it is not useful or worthy of the effort to build it.

  1. Start small and think simple 1st projects
  2. Use known topologies.
  3. Use standard parts.
  4. Think about rig maintenance (like access).
  5. Think prototype and then a final build.
  6. Make it a single band as a starting place.
  7. Gather information and data on the circuits.
  8. A flashlight and screwdriver are not enough
  9. Build in modules ~ test as you progress.
  10. Keep records and test data
  11. Organize the information so it's useful
  12. Send me the code -- Think when you ask this question --- which code?
 
We could add a lot more to the list, but the message is clear you have to think like a homebrewer not just say I want to be a homebrewer. Scratch building a project has to start with a mindset about learning stuff -- for when you know stuff you can do stuff.

Those sending emails must be products of the flash the plastic generation. They read the first page of a murder mystery and immediately jump to the last page and miss everything in between. 

I try to be responsive to requests for assistance but am beginning to believe I should stop. It takes time and my time today is most valuable. In a recent email asking, "send me the code", I suggested the person visit my website and then identify which project. The response back was I looked at a couple of the projects but just send me the code. My time has been wasted!

TYGNYBNT


73's
Pete N6QW


Quarter-Wave Conquers: Christian and Andrea’s POTA Success Despite Solar Slumber

15 August 2024 at 11:20
Many thanks to Christian (IX1CKN) who shares the following field report: POTA Friends Meet to Activate IT-0737 by Christian (IX1CKN) With Andrea (IW0HK) in Turin for a few days, it would have been a shame not to use Sunday for a POTA activation, recreating the “Multicountry Rove” team that participated in the Friedrichshafen Fair. Our chosen destination, … Continue reading Quarter-Wave Conquers: Christian and Andrea’s POTA Success Despite Solar Slumber

One of the things I wish I had

was the skill to homebrew stuff. And by stuff I mean circuits, receivers, transmitters, accessories and the like. Oh, I can build kits all right - although as I age, my eyes aren't quite what they used to be, and SMD components can send shivers up and down my spine when they are microscopic. I can look at a schematic and make repairs. Heck, I did that for 22 years for a living. But to look at a schematic, and take a bunch of components and build a working whatever? I'm out of my league.

I look at the creations of Dave AA7EE or Bob W3BBO and I just wistfully whistle to myself. To have the prowess and ability to build a receiver or transmitter from scratch, have it work AND look beautiful too? God didn't gift me with that kind of talent.  And that's OK, I guess. I just muddle around with the few things I can make, which are usually non-electrical and always would look nicer if someone else had built them.  

Which brings me to last night. I needed a solution for my American Morse DCP paddles. I took them with me to FOBB, but stopped using them part ways into the event. I was hand holding them, and my big meaty paws were causing problems. I have the tension and contact spacing set so that this thing feels pretty much like a touch paddle. The problem is that it's so small that when I would hold it in one hand and key with the other, the holding hand would mess things up by accidentally creating extraneous dits and dahs.

I want to use them for the Skeeter Hunt, but realized that I need some kind of base. That would allow me to handle it better. But what could I use? I went down to the shack and started hunting around. I didn't have any wood or metal blocks laying around that would be useful, but then my eyes landed upon and old Velamints tin that had been sitting on the shelf for years. A possibility?

I took a punch and made a tiny hole in the lid. Then I went into my parts drawers looking for a screw and nut skinny enough to go through the hole in the paddle, but long enough to reach into the case. After rummaging around for a while, i found what I needed.

I'll go to a sporting goods store on Saturday and will purchase some of those small and round split bead sinkers that are used for fishing. I'll pour a few packets into the tin and will put some tape around the edges to make sure it never accidentally opens, "spilling the beans" as it were. That should make the base heavy enough for table top use without making it too heavy.

Just like my drive on mast holder, it's no work of art, and it's no ingenious design, but it works and I guess that's all I can ask for. 

And perhaps I won't even get the chance to use the paddles this Sunday, anyhow. I may just be operating the Skeeter Hunt from the shack, if at all. 91% chance of thunderstorms on Sunday afternoon. Yuck!

The other place I haven't been having any luck is listening for N5J - the Jarvis Island DXpedition. When I get home, they seem to be concentrating on 15 and 17 Meters. Not only can I not hear them, I can't hear the pileup, either!

72 de Larry W2LJ

QRP - When you care to send the very least!

Blast from the Past – WordStar 7.0 Archive

If you are of a certain age, you started with something like WordStar (or WordPerfect) most likely. Well those who want to continue have built archives to keep you going: https://sfwriter.com/blog/?p=5806 Anyone can have WordStar for DOS 7.0 up and running on a Windows computer in a matter of minutes using this archive; with just… Continue reading Blast from the Past – WordStar 7.0 Archive

Alan Roe’s BBC World Service Programmes for the A24 Season

By: Thomas
15 August 2024 at 10:14
Many thanks to SWLing Post contributor, Alan Roe, who writes: The BBC World Service “six-month” schedules now seem to have been deleted permanently from the BBCWS website. I have therefore produced my own “at-a-glance” schedule listing the BBC WS English programmes on shortwave, which I have now updated to version 1.3. Click here to download […]

Carlos’ Shortwave Art and recording of NHK World (August 14, 2024)

By: Thomas
15 August 2024 at 09:33
Many thanks to SWLing Post contributor and noted political cartoonist, Carlos Latuff, who shares his radio log art of a recent NHK broadcast. Carlos notes: Part of NHK shortwave radio news bulletin about typhoon n° 7 “Ampil” approaching Japan. Listened yesterday in Rio de Janeiro, Brazil. Click here to view on YouTube.

FT8/FT4 and very brief Es openings

Up to now I have always used FT8 rather than FT4, especially with QRP.  FT4 is quicker, but not as sensitive as FT8. I can imagine with Es out of season, FT4 might catch some openings that FT8 might miss. 

This would apply for other types of propagation too where very brief openings might occur. I can imagine some F2 DX openings might be very fleeting. FT4 might catch these. I am not sure how many monitor FT4, but I imagine far fewer than FT8. 

One useful future WSJT-X enhancement would be automatic detection of FT8 and FT4 speeds so stations could use either modes in either slots. 

Faroe Islands - NOT amateur radio

 

One of the things I enjoy about 365project is seeing other parts of the world. This photo recently appeared.

As I have said before, the idea is to post something every day. 

It is not connected in any way with Microsoft365. It is totally free although for a modest $19.99 a year you may have privacy and more albums. 

I have done it for about 13 years and love it. Some use it  to show their artistic talent. Others use it as a kind of visual diary. I am the latter!

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