COMTEK PR-75a User Manual

OPERA TOR’S MANUAL

PR-75a

AutoSmart-Tuning
Assistive Listening
Receiver

TM

357 West 2700 South • Salt Lake City, Utah 84115 • Phone: [phone] • Fax: [phone] • www.comtek.com

TABLE OF CONTENTS

Introduction ...........................................................

Controls and Indicators ...............................................

Setup and Operation .......................................................

Optional Accessories ............................................

Frequency Information ..........................................

Battery Information ...............................................

Belt Clip Removal and Installation ........................

Specifications .........................................................

Warranty and Service ...............................................

WARNING: MODIFICATION OF THIS DEVICE
TO RECEIVE CELLULAR RADIOTELEPHONE
SERVICE SIGNALS IS PROHIBITED UNDER
FCC RULES AND FEDERAL LAW.

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© 2004 COMTEK® All rights reserved.
Print Release Date 02-17-2010

INTRODUCTION

PR-75a

AutoSmart-Tuning
Assistive Listening

Receiver

he PR-75a personal receiver is

T

the newest generation of user-friendly ,
high fidelity monitor receivers for
auditory assistance and other personal
communication applications. When
turned on, this unique receiver will
automatically tune itself to the closest
transmitter . If other transmissions
need to be monitored, a manual,
AutoSmart-TuningTM (AST) control
will cause the receiver to seek any
on-channel group frequency
transmission in the 72-76 MHz band.

TM

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PR-75a CONTROLS AND INDICATORS

PR-75a Controls

BATTERY COMP AR TMENT :

n

The battery compartment
features a hinged battery cover
and a polarity protection design
to ensure that only proper
battery polarity can occur.

AUDIO OUTPUT JACK:

o

This mono audio output jack
accommodates any low impedance
mono or stereo headphone; also
functions as automatic on/off power
switch when headphone is plugged
in and also as rechargeable battery
charging access.

VOLUME CONTROL:

p

This control has 50 dB of range to adjust the audio
output for a comfortable listening level
(clockwise for maximum level).

POWER / RECEIVER ST ATUS INDICATOR:

q

LED indicator will display these four functions:

a. Fast blinking ----- Seeking channel
b. Continuous ------- Receiving signal
c. Steady slow flash -------- No signal
d. Rapid flash ------ Low battery

Additionally there is an audible

beeping to indicate a low battery.

AutoSmart-TuningTM PUSH BUTTON:

r

This one-button tuning control (AST)
allows the receiver to seek other channels
within the frequency group to which it is tuned.

DAT A I/O PORT:

s

For channel programming or specialty channel sequencing.

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PR-75a SETUP AND OPERATION

Setup

a. Open the battery door on the receiver (see page 8) and insert two 1.5 V AA

alkaline batteries (Eveready E91 or equivalent). This type of battery will offer
up to 100 hours of operation. If a rechargeable battery is to be used, ensure

that it has been allowed to charge at least twelve hours to bring it to full
charge (see page 9 for battery charger instructions).

The use of carbon batteries is not recommended.

b. Ensure that there is a signal on the air on a channel from A-J
(see frequency chart page 6). The PR-75a receiver must be within 150 feet
of the transmitter for best reception.

c. Plugging the earphone into the “Auto-On” audio output jack on the top of
the PR-75a receiver will automatically turn on the receiver and initiate the
AutoSmart-TuningTM process. (The LED will blink very rapidly during this
process.) The receiver will then tune itself to the closest on-air transmitter in
its vicinity . Based on the first channel found, the r eceiver will then determine
the channel group to which it belongs for multiple channel operation.
(The LED will illuminate continuously when a signal is being received.)
Pushing the AutoSmart-T uningTM button (AST) will cause the receiver to
seek another compatible channel being transmitted in the frequency group
being used.

NOTE: The headphone cord also functions as part of the receiver’s
antenna system. For optimum performance, this cord should be fully
extended. Coiling or bunching the headphone cord may reduce the range
of the receiver. Also, coil-cord type headphone cords are not
recommended. The receiver should be carried by the snap-on belt clip
(included) or in a pocket or belt-clip pouch.

d. Set the audio output level control to a comfortable listening volume. This

control is turned clockwise for maximum output level.

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