Re: LF: WSPR without an SSB TRX ?

[Andy Talbot <andy.g4jnt@googlemail.com>]

Also, although it doesn't appear to be linked to that web page,   http://www.g4jnt.com/JT4_Bcn.zip   Is a simpler piC code that generates JT4 messages and outputs the  data to a pair of l;ogic lines for driving an external four frequency source.   JT4 and WSPR have a lot in commonin within the data side of things; its just the number of symbols and timing that is different. So you could try mixing and merging the PIC code to get what you need.

Andy
www.g4jnt.com

On 7 April 2010 13:29, Andy Talbot <andy.g4jnt@googlemail.com> wrote:

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.

 

Andy
www.g4jnt.com

On 7 April 2010 13:16, Chris Osborn <g3xiz@yahoo.co.uk> 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