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RF Powermeter - Precision

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.

Details: Kategorie: RF Powermeter; Zuletzt aktualisiert: 08. Juli 2017

SOTA - Flight deck for KX3

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.

Details: Kategorie: SOTA; Zuletzt aktualisiert: 29. Juni 2017

Weiterlesen: SOTA - Flight deck for KX3

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.

Details: Kategorie: SOTA; Zuletzt aktualisiert: 29. Juni 2017

Weiterlesen: SOTA - DM/BW-094 - Kornberg

SOTA - DM/BM-344 - Kleiner Kulm - My first activation is done

During a business trip, I took the chance to activate a mountain in the Bavarian low mountains - Kleiner Kulm.

Details: Kategorie: SOTA; Zuletzt aktualisiert: 29. Juni 2017

Weiterlesen: SOTA - DM/BM-344 - Kleiner Kulm - My first activation is done

SOTA - Working conditions

My current working conditions for SOTA are:

ELECRAFT KX3. With its build in antenna tuner it does a quite remarkable job.
For the power I use a LiFePO4 battery with 12V 6,6Ah with a build in BMS.
Microphone for the SSB contacts is the stock-mike from ELECRAFT.
For CW I use the Palm Pico Paddle.
Antenna is a HYENDFED 3-band antenna.
Flight-Deck for KX3
A 10m fibre pole from DX-Wire - MINI
Some velcro-straps

Details: Kategorie: SOTA; Zuletzt aktualisiert: 29. Juni 2017

Switch-mode DC-DC converter

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.