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Components and Circuits For discussions about component types, alternatives and availability, circuit configurations and modifications etc. Discussions here should be of a general nature and not about specific sets.

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Old 18th Sep 2023, 12:09 am   #1
Julesomega's Avatar
Join Date: Dec 2012
Location: Stockport, Greater Manchester, UK.
Posts: 2,055
Default CIO Xtals

Looking through my 8MHz crystals this evening, I found a few marked USB, LSB, and CW, conveniently marked also with their frequencies:
USB 8989
LSB 8986
CW 8988.3

If these are for Carrier Insertion this would imply an IF of 8987.5kHz with a b/w of about 2kHz, but maybe they are part of a crystal mixer synth system from an early 23-channel CB rig.

Any ideas how they were used?
- Julian

It's good here

Last edited by Julesomega; 18th Sep 2023 at 12:17 am.
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Old 18th Sep 2023, 8:16 am   #2
G6Tanuki's Avatar
Join Date: Apr 2012
Location: Wiltshire, UK.
Posts: 13,883
Default Re: CIO Xtals

That was certainly an IF range I recall being used in some 70s and 80s HF transceivers, so I guess you're right in thinking that they are USB/LSB/CW crystals.
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