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

To: "[email protected]" <[email protected]>
Subject: RE: LF: Re: TXing WSPR on 630m on a Raspberry Pi, Stefan in QRP...
From: Rik Strobbe <[email protected]>
Date: Fri, 27 Mar 2015 15:26:46 +0000
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Thread-topic: LF: Re: TXing WSPR on 630m on a Raspberry Pi, Stefan in QRP...

Hi Stefan,

 

sri, no RF output. Just a audio signal (+/- 1500Hz) via the sound card.

It is intended to be used with a HF TRX (most of them will not transmit below 1.8MHz) and then divide the (attenuated) HF signal down to MF or LF.

 

73, Rik  ON7YD

 


Van: [email protected] [[email protected]] namens DK7FC [[email protected]]
Verzonden: vrijdag 27 maart 2015 14:53
Aan: [email protected]
Onderwerp: Re: LF: Re: TXing WSPR on 630m on a Raspberry Pi, Stefan in QRP...


Am 27.03.2015 14:43, schrieb Rik Strobbe:

Hi Stefan, all,

 

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...

I have written such a program for windows (actually you can set the devider ratio to any number between 1 and 100).
That way any HF TRX can be used to gerate a MF (or LF) WSPR signal with a simple CMOS ot TTL divider IC.
If anyone is interested just let me know ...
 
73, Rik  ON7YD - OR7T
 
Hi Rik,

Sounds good but how does the windows PC generate the RF? You know, the Raspi directly generates a "tone" at 475 kHz (or any other frequency up to 250 MHz), not at 1500 Hz.
Anyway it is interesting. Does your program provide time sync and a GUI to type callsign/locator/erp and a "duty cycle"?

73, Stefan
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