Message-ID: <20100103181609.ivn5yo6dmosk444k@webmail6.kuleuven.be>
Date: Sun, 03 Jan 2010 18:16:09 +0100
From: Rik Strobbe <Rik.Strobbe@fys.kuleuven.be>
To: "rsgb_lf_group@blacksheep.org" <rsgb_lf_group@blacksheep.org>
References: <805528.86512.qm@web28101.mail.ukl.yahoo.com>
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Subject: Re: LF: Anti Social ssb
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Pete,

There is no need for linear amplification with WSPR, so things can be =20
kept simple.
Another way to get a 500kHz WSPR signal is to generate WSPR with the =20
tones 14.6Hz separated at 5MHz and then divide by 10.
As Andy states the WSPR protocol is public (and pretty =20
straightforward), so writing the appropriate software shouldn'd be to =20
hard.

73, Rik  ON7YD - OR7T

Quoting M0FMT <m0fmt@yahoo.co.uk>:

> Probably simpler to to make up a transverter - mixer with a xtal  =20
> controlled oscillator and a few stages of linear amplification  =20
> driving the mixer with an SSB rig. The whole thing about WSPR is the =20
>  Low power aspect so no QRO linears required if you play the game.  =20
> Then use the readily available Software that can be down loaded for  =20
> 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
>
> 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  =20
> <g8fzk@g8fzk.fsnet.co.uk<http://uk.mc281.mail.yahoo.com/mc/compose?to=3D=
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  contro=
lled
>> 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:  =20
>> rsgb_lf_group@blacksheep.org<http://uk.mc281.mail.yahoo.com/mc/compose?=
to=3Drsgb_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 interfer=
ence
>> 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  =20
>> <g3kevmal@talktalk.net<http://uk.mc281.mail.yahoo.com/mc/compose?to=3Dg=
3kevmal@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<http://www.g3xbm.co.uk/>
>> G3XBM    GQRP 1678      ISWL G11088
>>
>>
>>
>
>
>
>