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Date: Sun, 3 Jan 2010 15:59:04 +0000
Message-ID: <fc7eccec1001030759p27b47433p401220a1f8533c49@mail.gmail.com>
From: Andy Talbot <andy.g4jnt@googlemail.com>
To: rsgb_lf_group@blacksheep.org
DomainKey-Status: good (testing) 
Subject: Re: LF: Anti Social ssb
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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
and safety police, is guaranteed to contain no substances hazardous to
health, but may contribute to dissolving the nether and polar regions



2010/1/3 Graham <g8fzk@g8fzk.fsnet.co.uk>:
> Roger
>
> '''=A0 More people should use WSPR - '''
>
> That's not as=A0 easy as=A0 it=A0 sounds , wspr=A0 needs=A0 a=A0 liner=
 audio to=A0 rf
> carrier=A0frequency =A0conversion,=A0=A0...fine=A0 if you have a=A0 conv=
entional
> transverter , mf exciter or ham set that works down to=A0 500/137 ...No=
 good
> if you=A0 have dividing logic in the=A0amplifier =A0drive train , vfo=A0=
 controlled
> or PIC based without the=A0 'ability'=A0 to=A0 run a wspr=A0 generating=
=A0 code set ..
> Its a=A0 good=A0 point worth making though ...
>
> G..
> From: Roger Lapthorn
> Sent: Saturday, January 02, 2010 10:20 PM
> To: rsgb_lf_group@blacksheep.org
> 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.=A0 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 interfere=
nce
> 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 <g3kevmal@talktalk.net>
>>
>> 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 =A0 =A0GQRP 1678 =A0 =A0 =A0ISWL G11088
>
>
>