Hi, Ive been trying to locate some basic info on 2 crystal filters... QF1A65 and QF1B65 made by Hi Q. They are in a Codan transceiver, so all I know is they are 1650kHz freq, The Hi Q site doesnt mention them in their support docs. I really want to know if one of them is an AM filter as this is what Im after for another Codan set. Any more info would be appreciated. JEFF ZL3JK
Codan Crystal Filter info?
Jul 21, 2006
3 Replies
First reply
I suggest IF filter as a band pass or upper and lower sideband, termaination will affect the loss and final filter shape slightly at this frequency try 1.2k with 10pF trimmer. in parallel. Include an isolating pad .
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