[Collins] RE: MECHANICAL FILTER

[yonglee@yonsei.ac.kr]

The BFO crystal frequencies usually go up as they age=2E=20
Most of the Collins radios I repaired had the problem=2E
Rather than replacing the crystals, I usually install a parallel capacitor
to pad down the crystal frequency=2E Last time I used a 36PF capacitor
to reduce the BFO frequency by 45Hz=2E I usually try to keep the BFO
frequency within +- 5Hz=2E
de HL1FB

--- Original Message ---
From: "Laird Tom N" LairdThomasN@JohnDeere=2Ecom
To: Barockteer@aol=2Ecom, hockeyguy@comcast=2Enet, collins@mailman=2Eqth=2E=
net
Date: Tue, 16 Dec 2003 07:17:35 -0600
Subject: [Collins] RE:  MECHANICAL FILTER

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>Yes, my bet is one of the crystals also, but let us know what the problem
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>was, when you find it!
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>Tom Laird WC9M
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>Moline, IL=2E
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>-------------------------------------------------------------------------
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>I have a 32S-3 that has different tone quality when going from USB to LSB
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>& the general consensus seems to be that the passband freq has changed in
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>the filter=2E
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>Could be, but it could also be that one of the BFO crystals has drfited as=
=20
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>well=2E Check them with a counter=2E Tony K1KP
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