Lectrosonics UM195b User Manual download pdf (Page 9)

UHF Belt-Pack Transmitter

5-PIN INPUT JACK WIRING

The wiring diagrams shown on the separate sheet represent the basic wiring necessary for the most common types of

microphones and other audio inputs. Some microphones may require extra jumpers or a slight variation on the dia-

grams shown.

Caution - When wiring the connector, do not use the connector body for any electrical connections.

A common mistake is to use the connector body as an audio ground. The connector body is

already used as an RF ground on VHF models and no other use is permitted.

It’s virtually impossible to keep completely up to date on changes that other manufacturers make to their products. It

is possible that you may encounter a microphone that differs from these instructions. If this occurs please call our toll-

free number listed on page 13 of this instruction manual. Our service department can answer your questions regarding

microphone compatibility.

10k

100

POS BIAS (OR GND)

MIC

SOURCE LOAD

LINE IN

NEG GND (OR BIAS)

10uF

330pF

LECTROSONICS

5V Mic Bias

To Mic Amp

Input Jack Input Circuit

When used on a wireless transmitter, the microphone element is in the proximity of the RF coming from the transmitter.

The nature of electret microphones makes them sensitive to RF, which can cause problems with the microphone/

transmitter compatibility. If the electret microphone is not designed properly for use with wireless transmitters, it may

be necessary to install a chip capacitor in the mic capsule or connector to block the RF from entering the electret

capsule. This modification is shown on the next page.

VHF transmitters use the shield of the microphone cord as the antenna. The UM195B uses a 1/4 wave flexible wire to

radiate the RF signal. There is really not much difference between these two approaches, with respect to the effect of

the RF on the microphone capsule. Even in transmitters that utilize a “dangling wire,” the microphone is still part of

the “ground plane” and is therefore still in the antenna circuit.

PIN 1 Shield (ground) for positive biased electret lavalier microphones. Bias voltage source for negative biased

electret lavalier microphones. Shield (ground) for dynamic microphones and line level inputs.

PIN 2 Shield (ground) for negative biased electret lavalier microphones. Bias voltage source for positive biased

electret lavalier microphones.

PIN 3 Low impedance microphone level input for dynamic microphones. Also accepts hand-held electret micro-

phones provided the microphone has its own built-in battery.

PIN 4 1K Ohm source load for non-Lectrosonics electret microphones. Use in conjunction with other pins to provide

attenuation of high level input signals.

PIN 5 High impedance, line level input for tape decks, mixer outputs, musical instruments, etc.

Rio Rancho, NM – USA

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Lectrosonics UM195b User Manual Page 9

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