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Stefan's Radio Blog

60m band in Switzerland

I found this today on the USKA's news page: Beginning with 1st of Januar the 60m band will available for HAM radio operators ins Switzerland. Allowed power is 15 Watts EIRP.

This is the IARU band plan for region 1:

5351.5 - 5354.0 khz
CW, Narrow band modes, digimodes
5354.0 - 5366.0 khz
All modes, USB recommended for voice operations
5366.0 - 5366.5 khz
Weak signal narrow band modes

Before Mars

Prequel to National Geographic channel's "MARS": Two young girls are moving into a new town. In the attic of their  house they find an old HAM radio transceiver. With the help of an old man they can finally make a contact with the ISS. The 30 minutes video can be found here on YouTube.

If you want to contact the ISS yourself start with listening. The AMSAT-UK provides a short guide to the beginner on their website, more information is available on the ISS fan club website. National Geographic created also a Guide To HAM Radio.

ICOM 736 Repair

This year my ICOM 736 had some problems. The first issue was a failure in the CAT interface. At some point I noticed that my computer log could not communicate with the ICOM transceiver anymore. It happend to be at the same time when I updated my OS to Windows 10. So I was put on the wrong track when I started my troubleshooting since in the past I had a lot of problems with Serial-to-USB adapters. I thought the new OS might be incompatible with the adapter I am using. But finally it became clear that the new OS did not cause the communication problem.

So I had to dive into the schematics which I found on the internet when searching for a ICOM 736 service manual. The CAT interface is located on the PCB inside the front panel. So I had to open the transceiver and to take it quite a bit apart:


Some measurements quickly revealed, that the driver transistor for the CAT interface was defective. Since I had no SMD transistor at hand I replaced it with one universal type in a TO-92 housing from my junk box:

After carefully reassembling the transceiver the CAT interface was working fine again. But a few weeks later another problem turned up: Receiving SSB and CW was not possible, the audio sounded like I had some IF filter problems or the band pass tuning was set to narrow. Receiving AM and FM worked fine. So I could not use the ICOM 736 anymore and was left alone with my Elecraft K2.

Yesterday when I tried to participate in the SSB part of CQ WW contest I finally was so annoyed by operating SSB with only 10 Watts output of my K2 that I took my ICOM 736 and tried to repair it. Luckily the problem was easy to find - a ribbon cable connector for the band pass tuning potentiometer had some contact problems. So within half an hour the ICOM 736 was fixed and I could easily made some more contacts in the contest.

Off-Topic: Managed to get my German Hunting License

This month I achieved an important milestone in becoming a Swiss hunter: I passed the German Hunting Exam :-) This may sound a little bit weird: Why do you need to pass a German exam for becoming a Swiss hunter? Actually you don't - but earlier in this year I was told that as a native German you have to pass also a German hunting exam if you want to hunt in Germany. So I decided to do learn only once and try to become not only a Swiss hunter but also a German one.

In April I passed already the Swiss firearm safety and shooting test. Until October I had to learn a lot  - either at home at my desk, in our hunting class or in the woods. So no time was left for HAM Radio. Hopefully I will now find some time again for my old radio hobby - until some weeks before my last Swiss hunting exam in June next year.


APRS Windows Phone - Working on version 1.2.0.0

I finally found again some time to work on next version of the APRS Windows Phone app. Since I got a new notebook I had to prepare the development environment first. That took quite some time today. As a first step I implemented a bug fix for the reported speed and improved some input validations for the settings. Tomorrow I will test the reported speed and begin to work on APRS monitoring.