[ForSale-Swap] Swap Mechanical filter and Xtals for 455.8 KC Xtal

[Philip Atchley]

Hello.
I've run into a snag on building my Longwave CW receiver.  I have an IF
bandwidth of under 400Hz and an audio bandwidth (800Hz) of 70 to 400 Hz.  My
problem is the only BFO crystals I have are 456.5 & 453.5 kHz (designed for
use with a 2kHz mechanical filter).  I've tried padding them down with
various inductors and capacitors but they refuse to "rubber" more than a
couple hundred Hz before they quit oscillating.  Guess they were designed to
be stable at their operating frequency!  I even tried a 455KC Xtal but it
"zero beat" my IF almost perfectly.  No 800 Hz "tone" there!

I NEED a crystal whose center frequency is about 455.8 to 455.9kHz.  It
would be BEST if it were in a HC-6/U or CR-45/U plugin  housing but at this
point I really don't care! I will solder it into the circuit or change
sockets if need be.

WHAT I WILL SWAP FOR IT: (3 items)
1. Kokusai Electric mechanical filter, -6dB at 2KC, -60dB at 60KC. On small
board WITH matching transformers.
2. 456.5KC Xtal with HC-6/U socket.
3. 453.5KC Xtal with HC-6/U socket.
These Xtals are "mated" to the Mechanical filter as they came out of the
same set.  Should make a nice SSB adapter (product detector) for a BA that
doesn't "DO" SSB so well.

I'd like to get this set "up and running" before the winter Longwave DX
season runs out <G>.

73 de Phil  KO6BB