Lectrosonics UM300b User Manual download pdf (Page 6)

CONTROLS AND FUNCTIONS

ANTENNA

OFF ON

–20

LECTROSONICS

LEVEL

AUDIO

UM300B

FREQUENCY

ADJUST

FREQUENCY

COARSE

FINE

LF ROLL-OFF

ADJUST

LF ROLL OFF

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.

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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Lectrosonics UM300b User Manual Page 6

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