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LF: Very low power WSPR test this evening on MF

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Subject: LF: Very low power WSPR test this evening on MF
From: Guyé André <[email protected]>
Date: Fri, 27 Mar 2015 14:51:40 +0100
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HI all.


Stefan DK7FC is doing very interesting test using WSPR with QRP TX on MF.


So this evening, I’ll also be testing a very very low power configuration :


  • 25 milli W output TX power (1 W and a 16 dB serial PI resistors attenuator on 50 Ohms) ;
  • 25 meters tube vertical without top hat capacitance antenna ;
  • The PAR (apparent radiated power) is about 200 microwatt.
  • I just mesured with oscilloscope the RMS HF voltage at the base of the antenna (at cold end of the serial tuned coil). It is only 0.7 Volt !


Of course, I think nobody can decode this low power signal on day time. I wait for some WSPR reports to night...


73. Andy – F6CNI – JN19QB



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