The first SOTA activation for 2018 is done. Monika (DL6SCF) and I activated the "Kaltes Feld" DM/BW-659. 

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Kategorie: SOTA

As described here, I've build an RF Powermeter.

After aquiring an HF signal generator, a used HP 8647A, I started to do some testing regarding the precision of the RF powermeter.

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Kategorie: RF Powermeter

FM bandstop

RF preamp

 

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Kategorie: SDR

Logbook for basic setup of Raspberry Pi 3

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Kategorie: IoT Internet of Things

01 01 2018 11 04 47

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Kategorie: IoT Internet of Things

I was able to get a used 40dB power attenuator from a fellow ham. It is a 250W version in a very good condition. The attenuator should be usable up to 6GHz.

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Kategorie: Measuring Technology

I've bought a cheap chinese DC-block on eBay for my spectrum analyser.

Here some measurements using the miniVNAtiny with vna/J:

SMA DC Block Detailed

 

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Kategorie: Measuring Technology

I've bought some 30dB SMA pads from Huber&Suhner. 

Here some measurements using the miniVNAtiny with vna/J:

HuberSuhnerSMA30dB Detailed

 

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Kategorie: Measuring Technology

Ich habe von **** eine gebrauchte, schaltbare Eichleitung gekauft. Laut Aufschrift stammt sie von **RE Instruments** aus Jülich. Sie dürfe aus der Zeit vor der Jahrtausendwende stammen und ist wohl aus einem HF-Signalgenerator ausgebaut worden.

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Kategorie: Measuring Technology

  1. RF Powermeter - First steps
  2. WSPR - last spots
  3. KiwiSDR - configuration
  4. WSPR - WSPRlite
  5. Audio CW-Filter NM0S/4SQRP
  6. KiwiSDR - first impressions
  7. WSPR - Drift problems & new synthesizer board
  8. WSRP - 2nd U3s finished
  9. KiwiSDR - Local SDR up and running
  10. RF Powermeter - Calibration basics
  11. Powermeter von DG7XO
  12. WSPR - QRP-Labs low pass filters
  13. WSPR - QRP-Labs U3S signal quality
  14. WSPR - QRP-Labs U3S
  15. WSPR - QRP-Labs U3S bad power supply
  16. RF Powermeter - Firmware 1.8.1
  17. RF Powermeter - Unstable reading - Reloaded
  18. hamware AT-515 Firmware
  19. hamware AT-615U Firmware
  20. hamware AT-615B Firmware
  21. hamware AT-502/AT-515/AT-615U Interface
  22. hamware AT-502 Firmware - Erweiterung für 160m und 80m
  23. hamware AT-502 Firmware - Update CI-V Schnittstelle
  24. hamware AT-502 Firmware - IRB P02
  25. hamware AT-502 Firmware - K2+RUMLOG
  26. hamware AT-502 Firmware - Kenwood erweitert
  27. GPSDO - Distribution Amplifier
  28. GPSDO - Commandline interface
  29. GPSDO - Some Measurements
  30. GPSDO - GPS Disciplined Oscillator

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

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