[Elecraft] K3 pwr out on digimodes

[Peter Connors, F5VNB]

Joe Subich, W4TV wrote:
> 
> Absolutely not!  When conventional rigs are generating ALC 
> their final amplifiers are ALREADY in compression and they 
> are generating IMD in the PSK31 signal.  

A bit sweeping, Joe. Surely any sane engineer would put the onset of 
system ALC at a level *before* the PA goes into compression? (Such 
systems would not include grid current derived ALC from some class AB2 
PA of yesteryear.)

To avoid the well-known problems of selecting suitable ALC time 
constants and loop gain, the K3 performs ALC at the DSP level: for any 
signal, SSB or PSK31, doesn't this demand a flat transmit passband in 
the system following the processing?

Good thread!

73, Pete F5VNB/G4PLZ