COMTEK PR-75a - Manual (Page 5)

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-Tuning
TM 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 receiver 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-Tuning
TM 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.
PR-75a SETUP AND OPERATION
Page 3