Clear-Com PRC-2 - Manual (Page 10)

Vitec Group Communications
PRC-2 UHF Multi-Frequency Belt-Pack IFB Receiver
1 - 4
Figure 1-3: Headphone Cord Strain Relief
MONO PLUG/STEREO PLUG USAGE
A Mono plug or a Stereo plug can be used with the PRC-2 headphone
jack directly. When a Mono plug is inserted, a special circuit senses
the “ring” to “sleeve” short and automatically switches off the ring to
prevent excess battery drain. To reset, switch power OFF then back
ON.
AUDIO LEVEL
Headphones and ear pieces vary widely in their sensitivity and their
impedance making it impossible to design a receiver with a fixed
output power level that is correct for all situations. High impedance
phones (600 to 2000) Ohms will have an inherently lower power level
due to their high impedance and likewise low impedance phones may
be extremely loud.
CAUTION! Always set the Audio Level knob to minimum
(counter-clockwise) when plugging phones into the jack, then
adjust the knob for a comfortable audio level.
FREQUENCY ADJUSTMENT
These two rotary switches adjust the center frequency of the carrier.
The 1.6M is a coarse adjustment and the 100K is the fine adjustment.
Each transmitter is factory aligned at the center of its operating range.
The default position of the frequency select switches is in the center of
the transmitter’s range. The receiver and transmitter switches must be
set to the same number/letter combination for proper operation.
To gain access to these switches, slide the access door sideways with
a fingernail.