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 > _______________________________________________ > Elecraft mailing list > Post to: [email protected] > You must be a subscriber to post to the list. > Subscriber Info (Addr. Change, sub, unsub etc.): > http://mailman.qth.net/mailman/listinfo/elecraft > > Help: http://mailman.qth.net/subscribers.htm > Elecraft web page: http://www.elecraft.com > > _______________________________________________ Elecraft mailing list Post to: [email protected] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
