[Elecraft] K3 pwr out on digimodes

[hb9ari]

Peter,

I don't read your message before sending my "very long" mine but i 
totally agree with you!
I can imagine that digimodes software generate  ± complex audio signals, 
then we can
adjust this audio level to allow TX chain, including PA, to work in a 
linear zone.
(I admit that we should be able to "anticipate" the maximum "peak" 
level...)
Many years ago, i had a friend who was a fan in live music recording; 
when possible,
he asked to the musicians to play just the loudest (fortissimo) part 
before the public representation;
he adjust then his recorder, an old Revox, just before clipping; with 
this procedure,
he was able to get the best dynamic with his "non professional" material.

2 cents more...

73 QRO fr Rudolf, HB9ARI

Peter Connors, F5VNB wrote:
> 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
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