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

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

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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.

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Kategorie: WSPR

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

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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.

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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.

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Kategorie: Shack

 

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

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Kategorie: SDR

I've build the original QRP-labs U3S from stock. Means the supplied crystal on the PLL-based synthesiser-board.

This configuration is basically working up to 20m with a lot amount of drift, but you will get many decodes on wsprnet.org. On 6m you can also get spots - once a day :-/

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Kategorie: WSPR

I've finished my second U3s.

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Kategorie: WSPR

Check out my new KiwiSDR running:

 

http://dl2sba.ddns.net:8073

 

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Kategorie: SDR

Ich habe das Leistungsmessmodul von Oliver, DG7XO nachgebaut. Es wurde in zwei Versionen in der cqDL vorgestellt. Oliver hat mir freundlicherweise eine Platine geätzt und den AVR programmiert, so dass nur noch Löten und Mechanik angesagt war...

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Kategorie: Shack

Test setup

MA1

I made some measurements using my miniVNApro with a simple test fixture fittig the QRP labs lowpass filters.

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Kategorie: WSPR

Measurement of the signal quality of QRP-Labs U3s with low-pass filters.Transmitter output is fed into a homemade 40dB power pad. The spectrum is measured using an SIGLENT SSA3021X analyzer.
The bias voltage was about 2.6VDC and the PA voltage was abt. 7VDC.

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Kategorie: WSPR

  1. WSPR - QRP-Labs U3S
  2. WSPR - QRP-Labs U3S bad power supply
  3. RF Powermeter - Unstable reading - Reloaded
  4. hamware AT-515 Firmware
  5. hamware AT-615B Firmware
  6. hamware AT-502 Firmware - Erweiterung für 160m und 80m
  7. hamware AT-502 Firmware - Update CI-V Schnittstelle
  8. hamware AT-502 Firmware - IRB P02
  9. hamware AT-502 Firmware - K2+RUMLOG
  10. hamware AT-502 Firmware - Kenwood erweitert
  11. GPSDO - Distribution Amplifier
  12. GPSDO - Commandline interface
  13. GPSDO - Some Measurements
  14. GPSDO - GPS Disciplined Oscillator
  15. RF Powermeter - Firmware 1.8.0
  16. RF Powermeter - Firmware 1.7.2
  17. RF Powermeter - Unstable readings
  18. RF Powermeter - Firmware 1.7.1
  19. RF Powermeter - Firmware 1.5.0
  20. RF Powermeter - Adopted Nextion library
  21. RF Powermeter - Precision
  22. SOTA - Flight deck for KX3
  23. SOTA - DM/BW-094 - Kornberg
  24. SOTA - DM/BM-344 - Kleiner Kulm - My first activation is done
  25. SOTA - Working conditions
  26. Switch-mode DC-DC converter
  27. Frog Sounds - Spurious emissions
  28. Frog sounds - The frog has arrived
  29. Frog sounds - How far can you hear a frog croak?
  30. Frog Sounds - Enhancements to the Frog

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

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