On Tuesday, August 11, 2020, 07:14:12 PM EDT, Bob kb8tq <kb...@n1k.org> wrote:
> The problem with the crystal is that it has a temperature coefficient. As a > narrow band filter, it will have a *lot* of delay. Crystal resonance moves > (with temperature) and the delay changes. I agree. The crystal needs to be ovenized. ;-) That very concern led me in my design to derive nearly all my receiver selectivity at baseband (DC) using op-amps, forgo any crystal filters, and keep the Q of the loop antenna low. 73.000 de John, KD2BD _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
