Lectrosonics UM700 User Manual download pdf (Page 12)

UM700

RF BYPASSING

2 WIRE MIC 3 WIRE MIC

Some mics require RF protection to keep the radio signal

from affecting the capsule, even though the transmitter

input circuitry is already RF bypassed (see schematic

diagram).

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 connector 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

The Lectrosonics M150-700 lavalier mic is bypassed correctly for use with the UM700 and is the recommended

microphone for the 700 Series wireless system.

LINE LEVEL SIGNALS

The normal hookup for line level signals is: Signal Hot to pin 5, Signal Gnd to pin 1, pin 4 jumped to pin 1, and pin

3 jumped to pin 1. This gives a 40dB attenuator that allows signal levels much higher than 3V to be applied without

limiting.

If more headroom is needed, insert a 100k resistor in series with pin 5. Put this resistor inside the TA5F connector to

minimize noise pickup.

If lower than normal line levels (less than 1V) are expected, use this hookup: Signal Hot to pin 5, Signal Gnd to pin

1, and pin 4 jumpered to pin 1. This provides a 20dB attenuator allowing signals as high as 3V to be applied without

limiting.

WIRING HOOKUPS FOR DIFFERENT SOURCES

CAPSULE

SHIELD

AUDIO

SHIELD

AUDIO

BIAS

TA5F

CONNECTOR

TA5F

CONNECTO

Preferred locations for bypass capacitors

Alternate locations for bypass capacitors

SHIELD

AUDIO

BIAS

3 WIRE ELECTRET MIC

POSITIVE BIAS

SHIELD

AUDIO

2 WIRE ELECTRET MIC

NEGATIVE BIAS

TA5F

PLUG

SHIELD

AUDIO

2 WIRE ELECTRET MIC

POSITIVE BIAS

SLEEVE

SHIELD

AUDIO

TIP

LINE LEVEL

TA5F

RCA or 1/4 " PLUG

PLUG

TA5F

PLUG

TA5F

PLUG

(See notes on ‘LINE LEVEL SIGNALS” above.)

SHIELD

Dynamic LO Z mic or electret with

manufacturers power supply.

DYNAMIC

TA5F

MIC LEVEL

PLUG

SHIELD

BIAS

AUDIO

WIRE ELECTRET MIC

NEGATIVE BIAS

SHIELD

TIP

SLEEVE

Mini Plug

DATA

TA5F

PLUG

Encryption Cable

LECTROSONICS, INC.

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Lectrosonics UM700 User Manual Page 12

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