Lectrosonics MM400b - Manual (Page 11)

Watertight Miniature UHF Belt-Pack Transmitter
Operating Instructions
Selecting the Compatibility Mode
All Digital Hybrid receivers are capable of working with
Lectrosonics MM400B transmitter, and by setting the
proper Compatibility Mode, the unit will also work with
200 Series and 100 Series analog receivers, plus some
other brands (contact the factory for details). In order to
operate properly, the transmitter must be set to the
operating mode of the matching receiver, which is
easily done using a small screwdriver and a battery.
The following procedure assumes that the Power ON/
OFF switch is configured for Normal Mode. If it has
been configured for Audio Mute Mode, see
Power
Switch Function Selection to change the configuration
to Normal Mode.
Note: The unit comes from the factory in the Digital
Hybrid mode.
1) Set the audio controls for the corresponding
receiver to minimum.
2) Install a good battery in the transmitter. Move the
Power Switch to ON and observe the Modulation
LEDs to determine the current Compatibility Mode.
The –20 and –10 LEDs will blink simultaneously:
• Once for 100 Series mode
• Two times for 200 Series mode
• Three times for “Other” receivers
• Four times for 400 Series mode
• Five times for IFB Series mode
3) Move the Power Switch to the OFF position.
4)
5)
6)
Modulation LEDs
POWER LED
Power ON/OFF
Switch
Loosen the Frequency Switch Cover Plate
Retaining Screen and rotate the cover to
expose the Frequency Select Switches.
With a small screwdriver (included with
your unit), set the Frequency Select
Switches to CC. (for Change, Change).
Power up the unit briefly – just long
enough to watch the LED’s glow and
then turn the transmitter Off.
Change the Frequency Select
Switch settings to one of the following positions:
• 100 Series mode: 1,1
• 200 Series mode: 2,2
• Mode 3: 3,3
• 400 Series mode: 4,4
• IFB Series mode: 5,5
7) Power up the unit briefly – just long enough to
watch the LED’s glow and then turn the transmitter
Off.
8) Set the Frequency Select Switches to 0,0.
9) Turn on the transmitter and observe the Modulation
LEDs to verify the compatibility mode for the unit
has changed.
NOTE: Each time the transmitter is turned on, the
Modulation LEDs will confirm the current
operating mode with the number of blinks listed in
Step 2. The mode setting will not change until
reset with the procedure listed above.
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
Frequency Switch Cover Plate
1.6M 100K
Frequency Select Switches
Adjusting Transmitter Frequency
If you are experiencing interference from another signal
on your operating frequency, you may need to change
the operating frequency of your system. This is done
through two Frequency Select Switches located under
the Frequency Switch Cover Plate on the bottom of the
transmitter case.
The left switch is for coarse frequency adjustment, and
it increments the operating frequency in 1.6 MHz steps.
The right switch is for fine frequency adjustment and it
increments the operating frequency in 100 kHz steps. If
you are using a 200 Series or 400 Series receiver, it is
suggested to use the built in frequency spectrum
scanning function on the associated receiver to find a
clear channel. Turn the transmitter off and leave the
receiver turned on. Scan across the frequency band to
find a frequency where little or no RF activity is dis­
played. Set both the transmitter and the receiver to this
new frequency. Turn on the transmitter to ensure the
RF signal is strongly indicated at the receiver.
Rio Rancho, NM 11