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Re: LF: Re: TXing WSPR on 630m on a Raspberry Pi, Stefan in QRP...

from [DK7FC] [Permanent Link][Original]
To: [email protected]
Subject: Re: LF: Re: TXing WSPR on 630m on a Raspberry Pi, Stefan in QRP...
From: DK7FC <[email protected]>
Date: Fri, 27 Mar 2015 14:27:50 +0100
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Hi Andy,

Am 27.03.2015 11:26, schrieb Guyé André:
If you want to have real QRPP test, you can test WSPR at 500 micro watt PAR, and still have lucky reports up to 1500 km.

Oh, that will highly depend on your location i think. Maybe we are in about the same situation whereas PA stns are advanced :-)

Another interesting test is to have lucky reports up to 1500 W ;-)

Now i want to try to wind a trifilar winding on the FT50-77 to get an opposite phase signal to drive my 12V/100W PA from the Raspi. And i wrote an email to PE1NNZ and asked to a modification of the C-program to generate a signal with 4x higher FSK shift. Then it it would be possible to use that version for OMs having a divide-by-4 stage in their PA (to get a perfect 50% duty cycle and rectangular shape (after passing optocouplers etc)). This would be a safe way to drive my QRP PA, testwise of course...

Good luck with your experiments.

73, Stefan
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