On Wed, Jun 3, 2020 at 04:43 PM, Oliver K6OLI wrote:
Have fun experimenting
The badge's , FM and HF are a little simplistic ,
Vara FM is intolerant of frequency displacement , having no AFC facility
this is inherent in a FM system , tx and recovered Rx tone's are always
identical [ frequency] . hence AFC was not provided.
But, out of the box, , could also be conveyed via Am or
perhaps pilot carrier SSB or AM- vestigial sideband ? ,
9600 , Requires a greater bandwith , as provided for 9600 packet
hence the need to use the 9600 option of the Tx/Rx ,
but is still essentially FM , with zero off set capability .
Vara HF is provided with AFC and is able to detect off sets, but
Can also be used over FM links , if the link is very poor or
Narrow bandwidth ,
During testing , I found with a local satation on 6 meters .
who , had high 'solar panel' wide band noise , switching from SSB
to FM tx/rx mode provided a higher maximum rate ,
Take a look at the V-Sat for chat , that has some novel
netting and measuring functions .. based on the HF modem
Not the inteded deployements , but room for experimentation -)