I've developed a new firmware for my RF Powermeter. In this firmware, the user can now program for six calibration points the factors for the polynimial regression functions.

Therefor I've developed a JAVA GUI application for downloading these floating point values to the device.

*** CAUTION ***
All stuff described in this post is ONLY running on an Arduino which runs the OptiBoot bootloader. The EEPROM capability of the OptiBoot bootloader is needed for the features of firmware V1.7.1

I described here a way how to flash the OptiBoot loader on an Arduino UNO clone. For this you need an ISP or a second Arduino to act as an ISP.

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Kategorie: RF Powermeter

I've added a new feature to the firmware release 1.5.0 V1.5 1 - power offset V1.5 3.

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Kategorie: RF Powermeter

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.

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Kategorie: RF Powermeter

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.PowerDev

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Kategorie: RF Powermeter

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.

DSCF4266

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.

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Kategorie: SOTA

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.

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Kategorie: SOTA

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

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Kategorie: SOTA

My current working conditions for SOTA are:

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Kategorie: SOTA

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.

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Kategorie: Power supply

  1. Frog Sounds - Spurious emissions
  2. Frog sounds - The frog has arrived
  3. Frog sounds - How far can you hear a frog croak?
  4. Frog Sounds - Enhancements to the Frog
  5. Miss Mosquita - a new girl in town
  6. WSPR live data
  7. WSPR some data
  8. RF detectors
  9. WSPR first data analysis
  10. WSPR data collector
  11. PiAware
  12. vna/J ist umgezogen
  13. vna/J moved to a new location
  14. Reflash Arduino UNO ATMEGA16U2
  15. IoT Powersensor #2
  16. IoT Powersensor #1
  17. Arduino Library for AD7887
  18. RF Duinode
  19. ADS-B Filter
  20. IoT System management
  21. IoT MQTT Infrastructure
  22. IoT MQTT configuration
  23. ELECRAFT K-POD
  24. Rotator control with a NodeMCU runs stable
  25. Detailed measurement on audio CW-filter
  26. Audio CW-Filter finished
  27. Rotator control and the NodeMCU - a proof of concept
  28. Wanderungen/Ausflüge
  29. CW-Sensor-Keyer
  30. IoT Lightsensor

2014 CW (Morse Telegraphy) was added to the German Nationwide Inventory of Intangible Cultural Heritage.

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