Lectrosonics MM200 - Manual - Manual (Page 9)

Frequency Agile UHF Miniature Belt-Pack Transmitter
ADJUSTING THE TRANSMITTER FREQUENCY
If you are experiencing interference from another signal on your frequency,
you may want to change the operating frequency of your system. The left
switch changes the operating frequency by 1.6 MHz per step and the right
switch changes it 100 kHz per step. If you are experiencing interference,
change the operating frequency in 100 kHz steps to find a clear channel. If
it is not possible to find a clear channel using the 100 kHz switch, return it to
0 1
2
3
4
5
6
7 8
9
A
B
C
D
E
F 0 1
2
3
4
5
6
7 8
9
A
B
C
D
E
F
1.6M 100K
its original position and change the 1.6 MHz switch by one click then try the
100 kHz switch again.
To gain access to these switches, unscrew the retaining bolt that holds the
access door to the case. It is not necessary to remove the bolt from the case since it is retained by the case with
enough room to still remove the access door. Pull the access door away from the case and swing the door to the
side to gain access to the frequency switches.
MICROPHONE RF BYPASSING
Some mics require RF protection to keep the radio signal
2 WIRE MIC 3 WIRE MIC
from affecting the capsule, even though the transmitter
input circuitry is already RF bypassed.
If the mic is wired as directed, and you are having
difficulty with squealing, high noise, or poor frequency
response; RF is likely to be the cause.
The best RF protection is accomplished by installing RF
bypass capacitors at the mic capsule. If this is not
possible, or if you are still having problems, capacitors
can be installed on the mic wires inside the TA5F con­
nector housing.
Install the capacitors as follows: Use 330 pF capacitors.
Capacitors are available from Lectrosonics. Please
specify the part number for the desired lead style.
Leaded capacitors: P/N 15117
Leadless capacitors: P/N SCC330P
All Lectrosonics lavalier mics are already bypassed and
do not need any additional capacitors installed for proper
operation.
CAPSULE
CAPSULE
SHIELD
AUDIO
SHIELD
AUDIO
BIAS
MIC
CONNECTOR
MIC
CONNECTOR
Preferred locations for bypass capacitors
Alternate locations for bypass capacitors
Rio Rancho, NM – USA 9