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

My new U3S is online :-)

U3S 2

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Kategorie: WSPR

I've read the PA bias study from Hans and tried to tweak the PA of my U3S for optimum harmonics suppression etc. The spectrum is measured using an SIGLENT SSA3021X analyzer. The power is measured using a 40dB tap and a cheap 20w Dummyload from Diamond: ATT The tap is based on the work of OZ2CPU.

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Kategorie: WSPR

With the firmware version 1.8.1 there are some minor enhancements:

  • Offset value is displayed on main screen. "O" at the end of the unit is removed
  • Waveform display also correct when offset is enabled

Here are the required files:

Details
Kategorie: RF Powermeter

Some times ago, I found for me a solution, how to handle the unstable readings from the ADC. I've described it in this post.

In the meantime, some HAMs also build the RF powermeter based on the work of Makis, SV1AFN and myself. One if these HAMs, PA3AXA Rens, digged a little bit deeper and analysed the problem in detail. Here his description.

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Kategorie: RF Powermeter

I've created a new firmware for the hamware AT-515 tuner.

Please check a detailled description in this manual (currently German only)

*** The RAW-Mode for the interface is no longer supported ***

Some parts are available at cost price. Please check here.

 

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Kategorie: hamware

I've developed firmware version supporting the AT-615U tuners from hamware.

DSCF2116

You can find further information in the (German) manual. Parts are available at cost price. Please check here.

 

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Kategorie: hamware

 615B(c) DL1RF

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Kategorie: hamware

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

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

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