User Guide

PPA T27
10
Operating the Receiver
Turn the receiver on by rotating the volume control knob. The on indicator
should illuminate red. Refer to the channel selection chart in Table 2 to
choose from 8 standard frequencies.
Turn the channel selector knob to the
desired channel. Make sure the receiver
frequency matches the transmitter
frequency.
Adjust the volume to a comfortable
listening level. To turn the receiver o,
rotate the Volume control knob to the
left until it clicks o. The ON indicator
should not be lit. To prolong the battery
life of the unit, turn the receiver o
when it is not in use.
The on/low battery indicator (Figure 5)
is used to indicate: power, low batteries
or sleep mode. Refer to flash codes in
Table 3.
Table 3: PPA R37-8 LED Flash Codes
LIGHT CODE INDICATES REMEDY
On-O-On-O
(continuous)
Low Batteries Replace or recharge batteries
Fade-on, Fade-o
(continuous)*
No transmitter on
current channel*
After 6 min, Sleep/power save mode starts (extends
battery life)*
On Steady
Unit is operating
normally
n/a
*The R37-8 returns to normal operation automatically when a transmitter is re-established on the same channel.
The stereo headphone jack accepts either stereo or mono headphones or
earphones.
The adjustable squelch can help reduce user fatigue by turning o the
audio when the signal becomes weak. If the operator is annoyed or
fatigued by noise, turn the squelch up. This will reduce the eective range
of the receiver as a trade-o to listener comfort. Similarly if the operator
needs more range and can tolerate the noise, turn the squelch down*.
To adjust the squelch: using a small screwdriver, turn the knob to the right
for more squelch; left for less squelch.
*As the radio signal decreases, the noise present at the headphones increases. The squelch circuit senses the
signal level and turns o the audio as the noise increases. More squelch means this trigger point occurs earlier; less
squelch means it occurs later (or not at all, with no squelch). Apparent range is also aected. More squelch reduces
the apparent range; less squelch increases the apparent range.
Table 2: Channel Selection Chart
Freq. (MHz) Channel R37-8 CH
72.1 A 1
72.2 K
72.3 B 2
72.4 N
72.5 C
72.6 O 3
72.7 D
72.8 P 4
72.9 E
74.7 I 5
75.3 J
75.4 R 6
75.5 F
75.6 S
75.7 G 7
75.8 T
75.9 H 8