Pete,
There is no need for linear amplification with WSPR, so things can be
kept simple.
Another way to get a 500kHz WSPR signal is to generate WSPR with the
tones 14.6Hz separated at 5MHz and then divide by 10.
As Andy states the WSPR protocol is public (and pretty
straightforward), so writing the appropriate software shouldn'd be to
hard.
73, Rik ON7YD - OR7T
Quoting M0FMT <[email protected]>:
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 <[email protected]> wrote:
From: Andy Talbot <[email protected]>
Subject: Re: LF: Anti Social ssb
To: [email protected]
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
<[email protected]<http://uk.mc281.mail.yahoo.com/mc/[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]<http://uk.mc281.mail.yahoo.com/mc/[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]<http://uk.mc281.mail.yahoo.com/mc/[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
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