[Lowfer] WD2XES WSPR Again

[Johan H. Bodin]

John, Lowfers,

beeing a QRPer at heart, I don't like the idea of using a big PC as a 
QRPp beacon controller so I wrote a MEPT_JT beacon controller program 
that runs on a PIC. UTC sync comes from a GPS receiver, with NMEA 
output, connected to the PIC's serial port. The current version has two 
simultaneous outputs: AD9850 DDS control and/or two pins for VCXO 
control plus a TX keying pin. In my experimental setup, the VCXO control 
pins go to a 'HC4052 analog switch which selects one of three or four 
trim pot's. The output of the HC4052 goes to a varicap diode which is 
loosely coupled to the xtal oscillator. The pot's are set for 1,46484375 
Hz spacing between FSK tones.

Beacon message, DDS symbol frequencies and GPS baud rate can be 
programmed via the serial port (just download a small text file from a 
terminal program).

My PIC beacon is now running on the lab bench but there are still a few 
wrinkles (bugs) to iron out in the message download code. If there is 
interest, I'll be happy finish the program ASAP and share the code.

73
Johan SM6LKM

----

John Andrews wrote:
> Bill,
>> This mode looks promising.  I lost the first part, trying to figure 
>> out how to save the decoded text in the window.
> 
> For a two minute window, it seems to do as well as WOLF. Of course, WOLF 
> can build up copy over longer periods, and win the weak signal battle 
> easily. But it's a great way to do beacons, as you can have a bunch of 
> them with only 10-20 Hz separation, and get reports on all that were 
> copyable during that two minutes. I wish we had a bunch of beacons!
> 
> John A.