Fixing a TS-520 Band Select Switch

One of the major problems with the TS-520 I have was that the band select switch did not actually select a different band. This was problematic, of course, and turned out to be a rather interesting fix. As it turned out, there were two rods inside connected by brass inserts housed in a plastic shell. That plastic shell had broken, but, to God be the glory, I managed to fix it.

To do that, I fired up FreeCad and, after taking a few measurements of the real deal, I put a plastic sleeve together. It took me three tries to print it “just right”, for a really tight fit for the brass inserts. The first time was too short, the second time was too tight, and the third try was right on the money.

I exported it to an STL file and ran it through Slic3r for my Colido3D printer. This gave me the G-Code file, which I input into Cura, and out popped the cylinder. You can check out all three files in my MediaFire account, if you’d like. I thought I’d share since some one else may need that part also.

The final result was pretty tight, which is what I wanted. The brass inserts are knurled and I wanted the knurling to cut into the plastic on it’s way in. I had to lightly tap it in with a hammer at the end.

Now that it’s fixed, I look forward to spending a little more time with the 520 to see how well it works on other bands.

Linux – keep it simple.

Building an External VFO Cable

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The gentleman who sold me the TS-820S was actually quite generous. For what little I paid for the transceiver compared to it’s online costs, I not only got the unit, but several microphones, and a matching external speaker and VFO, as well as all sorts of parts to build several cables.

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I was a little confused on how the nine pin cable went together at first, but I managed to figure out that I was originally putting it together backwards! Once I turned it around the right way it was fairly straight forward to build.
Unfortunately, I left my fine tip soldering iron at work, so I had to use this big brute of a soldering iron to get the job done. That certainly made it a bit trickier, but I managed.

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Once it was all hooked up, it seemed to work pretty well. I think I need to take apart and clean the VFO up, because as you turn the knob, it seems to have a few “dead spots”, but if you wiggle it a bit, it comes back. Maybe I just need to exercise it a bit, as it may not have been used for over 10 years for all I know.
But, to God be the glory, it is great to have the cable built and the unit working!

Linux – keep it simple.

Fixing An Old Microphone

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When I bought the TS-820S, one of the extra things that he gave me was this microphone. It doesn’t have any label on it and any decals or writing have long since worn off. However, with a little web searching, it looks a lot like a Shure 522, but maybe a knock off, or a different Shure model number, since the microphone cover is different.

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Either way, I had the simple task of replacing the plug, and doing some general cleaning. Looks like the previous owner was a heavy smoker.

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In any event, replacing the plug went fairly quickly and a quick radio check showed it keyed well. The only problem was that I didn’t find anyone to talk to on the 10 meter band, so I don’t know how well it sounds. But, it looks like it is functional from an electrical standpoint. I’ll try using it on the next net meeting and see what feedback I can get from the others on the net.

Linux – keep it simple.

A new layout for more space.

Having a household of several children, it can at times be hard to find some space for my projects and equipment. As it was, I had a perfect spot in the laundry room with a whole desk to myself. However, the desk was a bit crowded with my TS-820S radio, my 3D printer, and my home server computer. With this equipment on the bench, I didn’t really have a space to work on anything new.

So, I decided to try to rearrange the laundry room a bit and build a shelf to help organize my stuff.

As you can see in the pictures, the before shot shows the laundry room as it was, with my desk. The after picture shows my new shelf and the shortened desk.

This has worked out incredibly well in the short time I’ve been using it since the switch. The entire contents of the desk are now on four shelves, and the shortened desk is completely empty and ready for me to work on equipment and projects! It’s not the most aesthetically pleasing shelf, but it is very sturdy and quite functional, and since it is hidden away in the laundry room, it is not in view of anyone who comes over. It also makes great use of what was once wasted and empty space.

Linux – keep it simple.

Piping audio into RSCW

In my spare time, I’m still playing around with RSCW, the Morse code decoder program. One of the hurdles that I’ve finally overcome (Praise God!) was how to send sound to the decoder. It turns out to be pretty simple, it just took me a few tries to get it right.

You see, by default, RSCW has several examples and options for sound input. Since it is an older program, it was written back when Linux kernel still used /dev/dsp and /dev/audio, back when everyone was using OSS and only a few had switched to ALSA sound. I don’t think PulseAudio was even a thing, yet…. It could also use input from programs such as sox, converting wave files to raw sound data, or use it’s own noise and CW generator.

Obviously, it would not be practical to record audio and then use sox to convert it and send it over to RSCW, nor would it be helpful to generate my own Morse code with the noise program, since I want to get live feeds from my HAM radio. I don’t want to downgrade my Linux kernel or OS to go back to the old method of sound card control, and to be honest, I’m not sure I really could without wiping my current setup.

Fortunately, there was a much simpler answer: arecord. Arecord is a “command-line sound recorder and player for ALSA soundcard driver”. In essence, it allows you to create recordings of anything being played or input into your sound system from the command line. The great thing is, as it has command line support, I can actually pipe it directly into RSCW rather than record the audio.

So, as a test, I jumped onto Morsecode.world’s translator page, which can generate Morse code from your input, and pasted information from the PulseAudio Wikipedia into the text field. This started playing Morse code over my speakers, to which I then used arecord to pipe to RSCW! Here was the output:

alaskalinuxuser@alaskalinuxuser-OptiPlex-790:/etc$ arecord | rscw -w 20 --track
RSCW 20 wpm mode track 1 - 3999 Hz ( rscw -h for help)
Recording WAVE 'stdin' : Unsigned 8 bit, Rate 8000 Hz, Mono
S A SOUND SERVER THAT PROVIDES REALBTTIME0 LOW LATENCY TGIAKEAK 5 MILLISECONDS OR LESSTQ AUDIO PERFORMANCE AND0 SINCE JACK20 SUPPORTS EFFICIENT LOAD B^CAborted by signal Interrupt…
alaskalinuxuser@alaskalinuxuser-OptiPlex-790:/etc$

The command is pretty basic:

arecord | rscw -w 20 --track

Of course there are more options that you could use, for both arecord or RSCW. Of interest is that you can use arecord to send just one specific input/output rather than everything or the default. You can list the available options with arecord -L:

alaskalinuxuser@alaskalinuxuser-OptiPlex-790:/etc$ arecord -L
default
Playback/recording through the PulseAudio sound server
null
Discard all samples (playback) or generate zero samples (capture)
pulse
PulseAudio Sound Server
sysdefault:CARD=PCH
HDA Intel PCH, ALC269VB Analog
Default Audio Device
front:CARD=PCH,DEV=0
HDA Intel PCH, ALC269VB Analog
Front speakers
dmix:CARD=PCH,DEV=0
HDA Intel PCH, ALC269VB Analog
Direct sample mixing device
dsnoop:CARD=PCH,DEV=0
HDA Intel PCH, ALC269VB Analog
Direct sample snooping device
hw:CARD=PCH,DEV=0
HDA Intel PCH, ALC269VB Analog
Direct hardware device without any conversions
plughw:CARD=PCH,DEV=0
HDA Intel PCH, ALC269VB Analog
Hardware device with all software conversions

Now that I can accept input, now I just need to play around some more and see what I can do for speed settings for RSCW. It currently requires that you choose a speed, as it is not programmed to detect the speed of the signal. A Telegram user told me I should try “Fldigi”, so I’m going to take a look at that as well.

Linux – keep it simple.

Building a Balun

After watching TRX Bench on Youtube, I learned how to make a balun. I am still a bit fuzzy on all the technical terms, but it is to convert an unbalanced load to a balanced one, hence BAL-anced to UN-balenced.

It is really neat to see all the different types, and to figure out what you would use them all for. To be honest, I haven’t got it all figured out yet. For now, I’m building baluns for specific antenna projects, where some other HAM has already charted the waters. In theory, then the antenna setup should work, it is only a matter of testing my home made balun.

For this project, I’m making a 1:1 balun, and two 4:1 baluns. The 1:1 is wound on a FT130 and the 4:1’s are wound over a FT140 toroid. Thus the slightly different sizes. I followed the Youtube video pretty closely, although I did use different wire, so I hope that they work well.

I also learned that I can double them, such as these two 4:1 baluns can be put together in series to make a 16:1 balun, or backwards to make a 1:1 balun. Either way, it’s fun to experiment and learn!

Linux – keep it simple.

TS-820 With a Digital Display Problem

It’s been nice playing around with my brother’s TS-520, but I’d like to pick up a radio of my own. I was able to get a TS-820 from a local HAM who was able to help me out with not only a good deal, but extra microphones, an external VFO, and speakers as well!

The 820 did have a bit of an issue with the digital display. When I first started using it, it didn’t read anything, just a few dots. After a while of use, it would start reading, but only 19.000.0 and it was a bit hard to read. Well, after taking a stroll online, I found several people had issues with them over the years, and a few guidelines of things to check.

Fortunately for me, the easy fix was the best. I simply took the TS-820 case off, and removed all the connectors and cleaned them, putting them back into place. Praise God, this worked wonders on the display, and now it tracks with me when I turn the VFO!

I was able to hear a few locals on the 820, but I think I need a better antenna setup for listening on the lower frequencies. I also couldn’t be heard by anyone, so I’ll have to check into that!

Linux – keep it simple.

A Discrete 10 Meter Dipole

I’m a bit new to the HAM radio scene. I’ve been playing around with it for a while, since I got my license back in 2018. For the most part I’ve been on the 2 meter band, and I decided it was time to step it up a notch and try some lower frequencies.

One item that helped push me in this direction was the availability of a TS-520 Kenwood radio that my brother has asked to store at my house. It needed a little bit of work, so I’ve been playing with it a bit, cleaning it up, and decided to try putting it on the air.

Of course, that would mean I need an antenna. So, I decided to purchase a 1:1 balun and set up my own dipole. I could put it out in the yard, we live on an acre and a half, and I’m not ashamed to be a HAM radio enthusiast, but I felt it would look nicer if it was a little more discrete. So, I put it in the attic.

The radio itself sits in the laundry room, with a wire that runs up the wall, outside through the old dryer vent (it used to be in a different spot), up the side of the house, and into the roof trusses to the attic area. Our house has a cold roof, so it is not heated and open air.

I made sure to follow the math rules for building it at a length (feet) = 468 / frequency (MHz), giving me a dipole at around 16.5 feet total. The kids helped me hold the wire while I cut it to length, and then I climbed up in the attic to string it up. My brother brought over his antenna analyzer which gave me a little less than 2:1 SWR on 28.4 MHz, which wasn’t perfect, but good enough to get started!

We did a receiving test while he was in the yard with his mobile unit, and I was able to pick him up. I still need a microphone, so I was not able to transmit a reply yet. But, more to follow!

Linux – keep it simple.