[Boatanchors] WTB 453.65 and 456.35 BFO Crystals

[Dale Parfitt]

Hi Scott,
You might look at 455kHz ceramic resonators. They are near free so buy some from different manufacturers. Then use  a series cap to  put it on your frequency. I  just used one for  a BFO PCB  board I laid out for AM only receivers.
While the resonator said 455kHz, in my oscillator it came in at 446 KHz. I then  put  a variable cap in series and warped  the resonator up to 455KHz. Removed the variable, measured it and substituted an NPO/COG of the same value.
Here is one on a Clegg 66er:
http://www.parelectronics.com/vintage-clegg-66er.php
I can send pix of the board, schematic etc if  you think that would help. I also have spare PC boards.
Dale W4OP


-----Original Message-----
From: boatanchors-bounces at mailman.qth.net [mailto:boatanchors-bounces at mailman.qth.net] On Behalf Of wa9wfa
Sent: Friday, October 7, 2022 2:29 PM
To: Boatanchors List
Subject: [Boatanchors] WTB 453.65 and 456.35 BFO Crystals

Probably a long shot but I’m looking to buy a set of BFO crystals 453.65 and 456.35 for my receiver project.  If I can find some, I want to replace the variable BFO and use crystals for USB and LSB.  It’s not a problem if I stay with the variable BFO but I thought it would be nice to go with crystal control.  Thanks. 73 Scott WA9WFA
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