Lectrosonics SR170LE User Manual download pdf

DocuCam

™

SR170LE RECEIVER

CONTROLS & CONNECTORS

FRONT PANEL

POWER

The LED glows when the external power source is properly connected. If this lamp is very dim or does

not light up, check the external power source and connections.

This LED lights when the companion transmitter is turned on and there is sufficient radio signal for good

receiver operation. Internal circuits monitor both signal level and interference levels and decide if the

transmitted signal is strong and “clean” enough for satisfactory operation. If not, the RF lamp will go out

and the receiver will “squelch”, shutting off the sound output. This action is automatic and requires no

user adjustment.

MODULATION

-20 — This LED lights when the audio signal is 20 dB below full modulation. It is a general

indicator of minimum modulation required for a good signal to noise ratio. The LED

should flicker or stay lit when the user is speaking into the microphone.

0dB — This LED lights when the audio signal is at full modulation. This LED should only light

during the loudest “peaks” in the audio signal.

These LEDs continuously monitor the modulation (audio level) of the received signal from the transmitter

and are used when making initial adjustment to the transmitter. See the transmitter instructions regarding

adjustment of audio input gain on the transmitter.

REAR PANEL

AUDIO OUTPUT PLUG

A standard 3.5mm mini-phone plug that connects to the VCR audio input.

AUDIO OUTPUT LEVEL CONTROL

An output attenuator trim pot used to regulate the output audio level of the receiver. When adjusted fully

counter-clockwise, the output will be the same as from a typical microphone. When adjusted fully clock-

wise, the output level will be at a “line” level (-10dB). Intermediate settings are sometimes necessary due

to the variations in different input compressors and ALC (automatic level control) circuits on different

VCR’s and audio inputs.

ANTENNA

A standard BNC connector accepts RF input from an external antenna. 50 Ohm impedance.

12V DC POWER

Apply 12 Volt DC power to this jack. Power consumption is 100 mA, maximum. Observe the polarity of

the connector illustrated on the next page. The receiver is protected from damage that may be caused by

reverse polarity.

If reverse polarity is applied, the receiver will simply not operate (no LEDs). Re-connect the lead for

proper operation.

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Summary of Contents

Page 1 - SR170LE RECEIVER

DocuCam™ SR170LE RECEIVER CONTROLS & CONNECTORS FRONT PANEL POWER The LED glows when the external power source is properly connecte

Page 2 - R E A R P A N E L

5 RELAY CONTACT This locking micro-jack provides a relay driver (open collector) triggered by the RF circuit in the receiver. When the RF LED li

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Lectrosonics SR170LE User Manual

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Summary of Contents

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