Lectrosonics UH200c Manuel d'utilisateur télécharger pdf (Page 4)

CONTROLS AND FUNCTIONS

The UH200C may be used with a wide variety of microphones.

The 3-pin XLR connector on the UH200C allows the transmitter

to be used with any dynamic microphone, as well as many two

wire positive bias lavalier systems (such as those systems sup-

plied by Lectrosonics).

INPUT JACK

Standard 3-pin Switchcraft XLR type. Pin 2 is signal, pin 3 is a

floating signal ground, and pin 1 is case ground (see schematic

below). The UH200C is self-locking onto a standard microphone.

The XLR connector is permanently bonded to the metal collar,

and is not normally replaceable. The electret bias is 5 Volts at

1mA or less. The bias is connected in a “phantom” manner and

will not interfere with any standard balanced microphone. If

severe noise is experienced when the microphone is moved

with respect to the UH200C, the cause is an unbalanced

condition between pins 2 and 3 of the microphone.

To Mic

Preamp

1uh

100

+5V

100uf

Input Jack Schematic

POWER/MUTE 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.

The center position is an “audio mute” which should be used

when setting the MIC LEVEL control. The “mute” position shuts

down the pilot tone in the transmitter and allows you to adjust

the audio modulation level without the possibility of feedback.

POWER ON/OFF LED

Glows brightly when battery is good. A weak or dim LED means

that the battery is weak, and has about an hour of operation left.

If the LED fails to light, the battery should be replaced. The

power LED should light up in both the “mute” and “on” positions

of the POWER/MUTE SWITCH.

The POWER LED 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 4.5 hours the battery voltage will be about 7 Volts. The

LED will be completely extinguished. 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.

LIMIT LED

LEVEL LED

BATTERY

POWER

LED

LEVEL

OFF

MUTE

TOP VIEW

CONTROL PANEL

Please note that a weak battery will sometimes light the POWER

LED immediately after turn on, but soon will discharge to the

point where the LED will extinguish.

The combination of an accurate battery condition indicator and

regulation of all internal circuits guarantees much longer battery

life, as well as consistent performance versus battery life.

MODULATION LEDS: Indicate the proper setting of the MIC

LEVEL control.

LEVEL LED: Flickers or glows most of the time if the audio

volume is adequate for normal operation.

LIMIT LED: Lights up when the audio volume is high, indicating

that the signal level is being limited by the compressor. Opti-

mum signal-to-noise ratio is obtained when the limit LED lights

occasionally.

MIC LEVEL: Used to adjust the audio input volume for the

proper modulation level. Rotate knob until the LEVEL LED

flickers when there is an input signal. The LIMIT LED should

light occasionally.

FREQUENCY ADJUST

These two rotary switches adjust the center frequency of the

carrier. The 1.6M is a coarse adjustment and the 100K is the

fine adjustment. Each transmitter is factory aligned at the

center of its operating range. The default position of the fre-

quency select switches is in the center of the transmitter’s

range.

Frequency select switches, default position (8,8)

1 2 3 4 5 6 7 8 9 10

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Lectrosonics UH200c Manuel d'utilisateur Page 4

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