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Wireless microphone crystals

S

Spehro Pefhany

Jan 1, 1970
0
Hi,

I ended up with a VERY old stack of 50-100 paper envelopes, each
containing at least one crystal HC-49 full size. Some are new, some
pulls.

There are alien markings like 77-TX and T82B-TX as well as frequency
numbers such as 154.60, 171.025, etc. The frequency numbers are
related to the stamped crystal frequencies by a factor such as:
fcrystal = (1/2) * (frequency - 21.4MHz)

Are these things of any use to anyone here? If so, they're yours for
the cost of postage (should be less than $15 to anywhere in US or
Canada). Otherwise, they'll go out in the trash

I imagine modern mics are all synthesized from a single crystal
source.

Best regards,
--sp



Best regards,
Spehro Pefhany
 
P

Phil Allison

Jan 1, 1970
0
"Spehro Pefhany"
I ended up with a VERY old stack of 50-100 paper envelopes, each
containing at least one crystal HC-49 full size. Some are new, some
pulls.

There are alien markings like 77-TX and T82B-TX as well as frequency
numbers such as 154.60, 171.025, etc. The frequency numbers are
related to the stamped crystal frequencies by a factor such as:
fcrystal = (1/2) * (frequency - 21.4MHz)

Are these things of any use to anyone here? If so, they're yours for
the cost of postage (should be less than $15 to anywhere in US or
Canada). Otherwise, they'll go out in the trash


** Put them on Ebay.

Bet someone bids a couple of bucks each for them.

BTW:

Transmit crystals (TX) used in most radio mics are a special cut that allows
them to be easily "pulled" by up to 0.05% to create FM.


.... Phil
 
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