[Lowfer] WE2XGR/2 in WSPR mode

[John Andrews]

Bill,

> Now I'm wondering if the SSB requirement may be only for 
> receiving and a linear final may not be needed for transmitting.

An SSB exciter would be needed to translate the sound card audio up to 
the desired radio frequency. But since WSPR works by frequency shift 
keying, and only one tone is present at a time, linear amplification is 
not required once the RF signal is created.

Actually, for this mode you could dispense with SSB generator if you 
could program a DDS chip to do the proper shifts in the right sequence.

John A.