Re: ubitx - stop press
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Thank you Ashhar,
My 'observations' show that proper termination of the QER filter (and matching the crystals!) provides lower ripple in the pass-band together with lower losses. It really depends on what kind of crystals one is using. Mine required 150pF capacitors to ground to achieve 2.7kHz -3db pass-band and -4 dB loss @ 50 ohms at both ends.
My experience is limited only to Minima crystal filter. I modified the Rx part of the bidirectional amplifier to the original Wes/Kopski circuit with a gain of +24dB (theoretical). I am still fighting with the KISS mixer, but I guess I go into too much off topic here.
Thanks once again and 73!
On Sat, Apr 8, 2017 at 6:32 PM, Ashhar Farhan <farhanbox@...> wrote: