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Subject: Re: LF: Re: TXing WSPR on 630m on a Raspberry Pi, Stefan in QRP...
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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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<br>
Am 27.03.2015 14:43, schrieb Rik Strobbe:
<blockquote
cite="mid:7E7DFBB4D102A04DB5ADC88D66628A4A234F1AFC@ICTS-S-MBX1.luna.kuleuven.be"
type="cite">
<meta http-equiv="Content-Type"
content="text/html; charset=ISO-8859-1">
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MARGIN-TOP: 0px; MARGIN-BOTTOM: 0px
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<div
style="font-family: Tahoma; direction: ltr; color: rgb(0, 0, 0); font-size: 10pt;">
<p>Hi Stefan, all,</p>
<p> </p>
<div><em><font color="#0000ff">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...<br>
</font></em><br>
I have written such a program for windows (actually you can set
the devider ratio to any number between 1 and 100).</div>
<div>That way any HF TRX can be used to gerate a MF (or LF) WSPR signal with
a simple CMOS ot TTL divider IC.</div>
<div>If anyone is interested just let me know ...</div>
<div> </div>
<div>73, Rik ON7YD - OR7T</div>
</div>
</blockquote>
<br>
Hi Rik, <br>
<br>
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.<br>
Anyway it is interesting. Does your program provide time sync and a GUI
to type callsign/locator/erp and a "duty cycle"?<br>
<br>
73, Stefan<br>
<blockquote
cite="mid:7E7DFBB4D102A04DB5ADC88D66628A4A234F1AFC@ICTS-S-MBX1.luna.kuleuven.be"
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