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Re: LF: WSPR without an SSB TRX ?

from [Andy Talbot] [Permanent Link][Original]
To: [email protected]
Subject: Re: LF: WSPR without an SSB TRX ?
From: Andy Talbot <[email protected]>
Date: Wed, 7 Apr 2010 13:29:47 +0100
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If you want a stanadalone beacon then    http://www.g4jnt.com/beacons.htm  gives info on WSPR transmission, and includes PIC code for controlling an AD9852 DDS and transmitting a pre-stored WSPR message.  
 
You coud dive inside the PIC code, extract the WSPR generating routine and use it to drive the frequency determining part of your MH Rx.   It does require a GPS receiver (and uses the Motoloa binary protocol)  to give the accurate timing info, but its virtually impossible to send WSPR without accurate timing anyway.
 
On 7 April 2010 13:16, Chris Osborn <[email protected]> wrote:
LF,
 
Is there a fairly simple interface unit which will enable me to
transmit WSPR signals using my home built MF TX ?
 
My TX has a VCO / FSK facility but no audio inputs.
 
I've had a search of the internet but haven't yet found any suitable circuitry.
All the articles I've viewed so far assume that one has an SSB transceiver...
 
73 Chris G3XIZ


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