Re: question about crystal spacing in filter
Some one once mentioned , thumbrule for xtal matching was within 10% of the required BW. However I try to keep it within 100hz for SSB filters.
Till date all appear to have worked fine.
PS: I make the BFO first and with 33pf in series with xtal measure all available with me. Select ones within 100hz of each other . Take the lowest one for carrier osc for BITX , takes care of xtal pulling.
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