I've introduced with the firmware version 1.7.1 a complexity to this project which may not be suitable to all users.
WIth the firmware version 1.7.2 I've reduced the complexity by removing the remote configuration utilities.
If you are using my powermeter software in conjunction with Maki's module and have a unstable readings or sporadic extrem value changes, this is a problem of the CS pin. It may be a grounding issue - Makis is currently analysing the problem.
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
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.
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.
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
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.
Currently I've done 6 QSOs with the Frog and my dipole antenna.
In 2015 I've build the Frog Sounds QRP transceiver.
This little transceiver still needs improvement:
- The output is still only 400mW
- The key-click is horrible - even with the additional audio cw-filter.
- The suppresion of harmonics is very bad. Check below.
Since last weekend a new QRP transceiver joined my shack I bought her used from a German HAM via the QRPFORUM community. The transceiver is one of the older projects from the DL-QRP-AG but still a neat little transceiver. It is still offered in kit-form from QRP-Project in Berlin.