I've added a new feature to the firmware release 1.5.0 - power offset
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The original library from Dan is not working as expected for me. So I adopted the code a little bit.
You can find the changes below. You can also download "my version" of the library here. Unzip into the Arduino's library folder.
As described here, I've build an RF Powermeter.
The basic firmware is now running. So I started analysing the accuracy of the used meter head.
Inspired by the work of Richard G3CWI from SOTABEAMS and his flight decks for some QRP transceivers, I decided to build a matching one for my ELECRAFT KX3.
Starting point was a clipboard which can be found for some bucks at AMAZON. In the lower section, I can simply secure my log sheets with the strong clip.
My second SOTA activation is done. Monika (DL6SCF) and I made a short hiking trip on the Swabian Alps. On top of the Kornberg we made a stop and started the activation ... unfortunately we have to shut down operation due to a rising thunderstorm.
During a business trip, I took the chance to activate a mountain in the Bavarian low mountains - Kleiner Kulm.
Weiterlesen: SOTA - DM/BM-344 - Kleiner Kulm - My first activation is done
My current working conditions for SOTA are:
I've used one of these cheap switch-mode DC-DC converters (available on eBay for a few bucks) for my WSPR U3S transmitter. Checking the transmitted signal reveals strong spurious emissions. Hints from the QRPLabs group leads me to the cause - the DC-DC converter. Replacing it with a linear LM317 one solves the problem.
I've checked this extremly simple concept for spurious emissions and whether they're compliant with the current regulations ...
2014 CW (Morse Telegraphy) was added to the German Nationwide Inventory of Intangible Cultural Heritage.
© 2021 Dietmar Krause, DL2SBA