There is a way...
If you can arrange an oscillator so that it can be pulled onto the
four WSPR tone frequencies (separated by 1.46Hz ) by two logic lines.
This could be as simple as two resistors, one twice the value of the
other, giving a 2-bit D/A converter, controlling a varicap on the
oscillator.
Then a PIC keyer can generate the logic level drive.
See www.g4jnt.com/WSPRBCNS.ZIP for details of generating teh WSPR
message and the PIC code
The design in there uses a GPS receiver to get accurate timing, but
with some trivial PIC code changes it could be made to work in a
standalone manually trigerred mode.
Perhaps there's a demand here...
WSPR encoding on the fly is easy enough in a PC
http://www.g4jnt.com/wspr_coding_process.pdf
A prog could be written to output the two-bit data via a USB/Serial
port and PIC based dongle...
Andy
www.g4jnt.com
Andy
www.g4jnt.com
This email has been scanned for damaging side-effects by the health
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2010/1/3 Graham <[email protected]>:
> Roger
>
> ''' More people should use WSPR - '''
>
> That's not as easy as it sounds , wspr needs a liner audio to rf
> carrier frequency conversion, ...fine if you have a conventional
> transverter , mf exciter or ham set that works down to 500/137 ...No good
> if you have dividing logic in the amplifier drive train , vfo controlled
> or PIC based without the 'ability' to run a wspr generating code set ..
> Its a good point worth making though ...
>
> G..
> From: Roger Lapthorn
> Sent: Saturday, January 02, 2010 10:20 PM
> To: [email protected]
> Subject: Re: LF: Anti Social ssb
> Mal,
>
> Some suggestions:
>
> More people should use WSPR - lots of stations (more than 100 at a time
> based on 10MHz usage) are able to operate together within just a 200Hz slice
> of the band allowing very useful data on propagation and station
> performance/changes to be determined. This would leave plenty of room
> elsewhere in the band for CW and other narrowband conversational modes.
> Occasional testing with SSB, for those allowed to use it (not UK), is of
> interest to me as a listener, but I agree that it's not a good idea to use
> this mode when the band is open for really long-distance DX if interference
> to weak signals is likely.
> You should try a New Year resolution: "I will be more tolerant and moan
> less".
>
> 73s and a happy New Year to all on this reflector
>
> Roger G3XBM
>
>
>
>
> 2010/1/2 mal hamilton <[email protected]>
>>
>> I am afraid we have a SSB beacon on 508 kcs spreading over 3 kcs wide and
>> S9 plus with me. Beacon SM6BHZ is causing QRM to those of us trying to
>> listen and work the East Coast USA stations. I cannot understand why a
>> station is licensed to work SSB in such a narrow band allocation.
>> The 500 kcs band is a Shambles swamped by beacons.
>> Does anyone else have an opinion?
>> G3KEV
>>
>
>
> --
> -------------------------------------------------------------
> http://g3xbm-qrp.blogspot.com/
> http://www.g3xbm.co.uk
> G3XBM GQRP 1678 ISWL G11088
>
>
>
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