Yesterday I've build the FROG SOUNDS 40m CW QRP transceiver.

I've ordered it as a kit from eBay Seller for about €10,- inclusive shipping to DL. The kit arrived well packed after about 15 days in my postbox.

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Kategorie: QRP

Currently I've done 6 QSOs with the Frog and my dipole antenna.

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Kategorie: QRP

In 2015 I've build the Frog Sounds QRP transceiver.

This little transceiver still needs improvement:

  1. The output is still only 400mW
  2. The key-click is horrible - even with the additional audio cw-filter.
  3. The suppresion of harmonics is very bad. Check below.

If someone has any ideas how to fix this, please Diese E-Mail-Adresse ist vor Spambots geschützt! Zur Anzeige muss JavaScript eingeschaltet sein!.

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Kategorie: QRP

Since last weekend a new QRP transceiver joined my shack V1 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.

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Kategorie: QRP

  Live data from my WSPR feed

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Kategorie: WSPR

Here some analysis of my recorded spots data with my spot data collector. As of today there are 45.000 spots recorded in my database.

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Kategorie: WSPR

I've done some measurements on two RF detectors - one on an older diode detector from ELDITEST Elditest 1 and another one on an AD8307 based one SV1AFN from SV1AFN.

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Kategorie: Measuring Technology

My WSPR data collector is now running some days and I started with some basic data analysis.

The power on the bands 60m to 20m is about 100mW!

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Kategorie: WSPR

Inspired from some work found on the Internet and the full functionality of my U3S I've build an automatic spot collector. The spot collector pulls every 5 minutes my spots from WSPRnet.org and puts it into a MYSQL database for later analysis. See the schematic for this setup Wspr V3

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Kategorie: WSPR

  1. PiAware
  2. vna/J ist umgezogen
  3. vna/J moved to a new location
  4. Reflash Arduino UNO ATMEGA16U2
  5. IoT Powersensor #2
  6. IoT Powersensor #1
  7. Arduino Library for AD7887
  8. RF Duinode
  9. ADS-B Filter
  10. IoT System management
  11. IoT MQTT Infrastructure
  12. IoT MQTT configuration
  13. ELECRAFT K-POD
  14. Rotator control with a NodeMCU runs stable
  15. Detailed measurement on audio CW-filter
  16. Audio CW-Filter finished
  17. Rotator control and the NodeMCU - a proof of concept
  18. Wanderungen/Ausflüge
  19. CW-Sensor-Keyer
  20. IoT Lightsensor
  21. Worked all Germany contest 2015
  22. ELECRAFT K2 - Fixing VFO ALC issue
  23. XPhase - Interference reduction
  24. LF-Converter
  25. SMD Solder Station
  26. Connecting an Arduino to MOSQUITTO
  27. Getting started with MOSQUITTO
  28. Getting started with 2lemetry
  29. Neuer DARC Image Film
  30. nanoKeyer - neue Frontplatte

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

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