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

 

Details
Kategorie: Measuring Technology

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

Here some measurements using the miniVNAtiny with vna/J:

HuberSuhnerSMA30dB Detailed

 

Details
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.

Details
Kategorie: Measuring Technology

Based on the work of Makis, SV1AFN i've build a small, stand-alone power meter with a "nice" GUI. This is the second RF head I've received from Makis. Data about the first one can be found here. MainScreen

Details
Kategorie: RF Powermeter

Here you can find the last spots for DL2SBA on each band within the last day and the all time farest spots.

Details
Kategorie: WSPR

Here I've collected some configuration stuff for my KiwiSDR.

Details
Kategorie: SDR

Today we had a meeting in our local amateur radio club ESSLINGEN P02.The topic for this meeting was WSPR.

Bernd DK9BH was the organizer of this meeting. He has ordered about 10 WSPRlites from SOTABEAMS. 

I had the chance, to do same basic measurements on one of the WSPRlite units.

Details
Kategorie: WSPR

Last year I've build the cheap Frog Sounds QRP Transceiver. This transceiver has a pretty basic audio section - a simple LM386 audio amplifier with some LC/RC filtering.

Details
Kategorie: Shack

 

Here are the first pictures of my KiwiSDR setup ...

Details
Kategorie: SDR

  1. WSPR - Drift problems & new synthesizer board
  2. WSRP - 2nd U3s finished
  3. KiwiSDR - Local SDR up and running
  4. RF Powermeter - Calibration basics
  5. Powermeter von DG7XO
  6. WSPR - QRP-Labs low pass filters
  7. WSPR - QRP-Labs U3S signal quality
  8. WSPR - QRP-Labs U3S
  9. WSPR - QRP-Labs U3S bad power supply
  10. RF Powermeter - Firmware 1.8.1
  11. RF Powermeter - Unstable reading - Reloaded
  12. hamware AT-515 Firmware
  13. hamware AT-615U Firmware
  14. hamware AT-615B Firmware
  15. hamware AT-502/AT-515/AT-615U Interface
  16. hamware AT-502 Firmware - Erweiterung für 160m und 80m
  17. hamware AT-502 Firmware - Update CI-V Schnittstelle
  18. hamware AT-502 Firmware - IRB P02
  19. hamware AT-502 Firmware - K2+RUMLOG
  20. hamware AT-502 Firmware - Kenwood erweitert
  21. GPSDO - Distribution Amplifier
  22. GPSDO - Commandline interface
  23. GPSDO - Some Measurements
  24. GPSDO - GPS Disciplined Oscillator
  25. RF Powermeter - Firmware 1.8.0
  26. RF Powermeter - Firmware 1.7.2
  27. RF Powermeter - Unstable readings
  28. RF Powermeter - Firmware 1.7.1
  29. RF Powermeter - Firmware 1.5.0
  30. RF Powermeter - Adopted Nextion library

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

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