400 Hz xtal filters. Help.

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From: ASIRENE@v9001.ntu.ac.sg
Date: Sun Mar 06 1994 - 22:56:21 EST


Hi fellas,

        I have a design problem. My homebrew QRP rig uses a 600 Hz BW IF
xtal filter consisting of 4 12.0000 MHz xtals in ladder configuration. I
am finding this BW insufficient for working pile-ups so am considering
changing it to 400 Hz. I was wondering if anyone can tell me how to do
this. Will it require additional xtal stages or will I need to only change
the capacitor values? How much improvement can I expect from this mod and
is there a better way out of this? Tks.

72 es 73,
Daniel


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