"Bob Urz" wrote in message
...


wrote:
Shure wireless handheld microphone. Spec can be found here if it can be
of any help http://www.shure.com/pdf/discontinued/L-Series.pdf

Microphone transmit at 180.4MHZ. It was made in 1990. It uses a 20.05MHZ
crystal by MTRON
as far as I can tell like the one uses in Radio Control car, but about
half the size. Can the frequency be changed to something like 218.5MHZ by
just changing the crystal?
If so, what frequency should I use? Thanks for any info you can give.

#1, Its not just one crystal, its two. Transmitter and receiver.
And unless you have a communications test set, i would advise against it.
If your determined to do it, send it back to shure to have it done
at the factory. Of course, its probably not worth it. Better to
sell it on Ebay or such and find a used one with frequencies that are
better suited to your uses. VHF wireless are on there way out. WHo knows
what frequencies will be clear in the future. Basically in the USA, VHF
is from around 169 to 215 MHz or so. You need to know what TV channels
are in use in your area now.

Bob

One thing to be accutely aware of is the fact that the "L" series is for use
by Broadcast Stations only. The microphone (transmitter) HAS to be licensed
under part 74 (Broadcast), and only TV/Radio station are eligible. If you
are playing with this in your house, it's probably not a real risk. If it's
at a public location, you need to use something that either doesn't require
a license, or something that you can (and did) license. It's not as if the
FCC is going to hunt you down. They now offer "snitch rewards", which gives
motivation to individuals to look for unlicensed users. I know of a couple
of underpaid local broadcast engineers that have played the game and won.


COPY FEDERAL COMMUNICATIONS
COMMISSION
WASHINGTON, D.C. 20554

GRANT OF EQUIPMENT
AUTHORIZATION COPY
Type Acceptance

Shure Incorporated
5800 W. Touhy Ave
Niles, IL 60714-4608
United States Date of Grant: 07/24/1989

Application Dated: 02/13/1989

Attention: Dillard Gilmore , Senior Engineer, Global Compliance

NOT TRANSFERABLE
EQUIPMENT AUTHORIZATION is hereby issued to the named GRANTEE, and is
VALID ONLY for the equipment identified hereon for use under the
Commission's Rules and Regulations listed below.


FCC IDENTIFIER: DD4L2

Name of Grantee: Shure Incorporated

Equipment Class: Licensed Broadcast Station Transmitter
Notes:

Grant Notes FCC Rule Parts Frequency
Range (MHZ) Output
Watts Frequency
Tolerance Emission
Designator
M4 74.861 174.0 - 216.0 0.05 0.005 % 60K0F3E


M4: Operation of this unit is limited to use at stations licensed for
use under Part 74 of FCC Rules.

Mail To:
None Specified,
MET Electrical Testing Co.
916 W Patapsco Avenue
Baltimore, MD 21230




8904278315022250