Lectrosonics UM300b - Manual (Page 6)

CONTROLS AND FUNCTIONS
ANTENNA
OFF ON
–20
0
LECTROSONICS
LEVEL
AUDIO
UM300B
FREQUENCY
ADJUST
FREQUENCY
COARSE FINE
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
LF ROLL-OFF
ADJUST
LF ROLL OFF
35 150
75 Hz LECTRO UM300B - Int. App No: RO192WM
Freq. Range: 844.8 - 862 MHz
Ser. No: XXXXXX - Block 33
Modulation Type: 180KF3E
INPUT JACK
The input on the UM300B accommodates virtually every lavalier, hand-held or shotgun microphone available. Line
level signals can also be accommodated. Use a Switchcraft TA5F connector on the cord. See the separate sheet
titled “Transmitter 5-Pin Input Jack Wiring” regarding the correct connections for various microphones, and
other sources.
ON/OFF SWITCH
Turns the battery power on and off. Even when the switch is turned off or on abruptly, the pilot tone muting system
prevents “thumps” or transients from occurring.
“ON” LAMP
Glows brightly when the battery is good and the ON/OFF switch is ON. A weak or dim lamp means that the battery
is weak. When the light goes out there is about 15 to 30 minutes of operation left. If the lamp fails to light, the
battery should be replaced.
The “ON” lamp is connected to a precision battery test circuit that continuously monitors battery voltage. The LED is
at full brightness with a new 9 Volt alkaline battery. As the battery voltage drops during use, the LED brightness will
also decrease. After about 7 hours of operation the battery voltage will be about 6.5 Volts and the LED will be
completely out.
FREQUENCY ADJUST
These two rotary switches adjust the center frequency of the carrier. The left
switch (COARSE) changes the operating frequency by larger increments and the
right switch (FINE) changes it in small increments per step. These steps are
determined by the programming in the unit. Refer to the chart of settings pro­
vided with the unit. 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
Since the internal circuits are all tightly regulated and the RF output stage has a
separate discrete regulator, the transmitter will continue to operate to a battery voltage of 6.5 Volts. From 6.5 Volts to
6 Volts, the transmitter will still operate, but with degraded performance. Please note that a weak battery will some­
times light the POWER LED immediately after turn on, but will soon discharge to the point where the LED will go out,
just like a flashlight with “dead” batteries.
The combination of an accurate battery condition indicator and regulation of all internal circuits provides much longer
battery life, as well as consistent performance over the life of the battery.
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