Re: LF: Anti Social ssb

[M0FMT <m0fmt@yahoo.co.uk>]

Probably simpler to to make up a transverter - mixer with a xtal controlled oscillator and a few stages of linear amplification driving the mixer with an SSB rig. The whole thing about WSPR is the Low power aspect so no QRO linears required if you play the game. Then use the readily available Software that can be down loaded for free.... no brain surgery required. 

73 es GL petefmt

--- On Sun, 3/1/10, Andy Talbot <andy.g4jnt@googlemail.com> wrote:

From: Andy Talbot <andy.g4jnt@googlemail.com>
Subject: Re: LF: Anti Social ssb
To: rsgb_lf_group@blacksheep.org
Date: Sunday, 3 January, 2010, 15:59

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

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2010/1/3 Graham <g8fzk@g8fzk.fsnet.co.uk>:
> 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: 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.  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 <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    GQRP 1678      ISWL G11088
>
>
>