[SSDN] Putting a Ceramic Filter in the "Mate for the Mighty Midget" Receiver

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SSDN via rec.radio.amateur.moderated Admin

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Oct 25, 2021, 10:04:38 PMOct 25
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Putting a Ceramic Filter in the "Mate for the Mighty Midget" Receiver

Posted: 25 Oct 2021 03:55 AM PDT
http://soldersmoke.blogspot.com/2021/10/putting-ceramic-filter-in-mate-for.html

It is really simple.  I had one of the +/- 3kHz (6 kHz wide) 455HT filters
on hand.  The spec sheets call for 2000 ohms at both ends, but looking at
the schematic it appeared that I already had high impedance on both sides
of the filter.  I put a .001 uF cap on the input side to keep the DC
voltage off the filter (see above and below). This capacitor allows us to
avoid the dreaded problem of

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