For casual SSB operating I listen to my LP-PAN / PowerSDR panadapter which is fed from ahead of the xtal filters, and for dabbling in contests or operating CW (where latency can be an issue) I listen to the K3. I am not in Europe where things can be dicey, but I have yet to see enough total peak energy in the passband to affect the ADC of the panadapter.
73, Larry N8LP > Next generation transceivers will not use crystal filters > and mixers, they are already appearing and the performance > is outstanding. If the next generation of transceivers does in fact abandon narrow filtering ahead of the ADC it will be a sorry step backward. While some of the designs like the Flex-5000 and Peresus have excellent specs for the most part when tested against two tone situations, they are still substandard in dealing with multiple very strong in-band signals as would occur on 160/80/75 meters in a contest or on 40 meters with the multiple megapower broadcasters. To maintain linearity, an ADC must be able to withstand the instantaneous peak signal (vector sum - not average) from all the signals within its passband. For some DSR designs that maintain bandwidths from several hundred KHz to 10s of MHz that peak signal handling capability requirement can be significant and represents a required dynamic range orders of magnitude greater than even the best current technology. It is the multi-tone interference that is best handled by narrow filtering ahead of the ADC (e.g., the K3 design). 73, ... Joe, W4TV -- View this message in context: http://n2.nabble.com/K3-vs.-HPSDR-Mercury-receiver-tp1471026p1473875.html Sent from the Elecraft mailing list archive at Nabble.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
