Page 6 - Combined_19_OCR
P. 6
Operation of Equipment open the squelch manually. When through talking
to a weak station, turn the squelch back until the
noise ceases. Reduction of volume at this point may
The equipment is turned on by an off-on or power
switch. Allow about 30 seconds for new equipment improve your reception.
and about two minutes for some of the older sets The VOLUME and SQUELCH controls affect
to warm up before transmitting. only the reception at your station. They have noth
ing to do with the signal you transmit.
The control marked VOLUME adjusts the loud
ness of the incoming signal. It has no effect on the Some radio units are equipped with a selective
outgoing signal. calling system that excludes reception of other users
sharing your channel. These systems do not elimi
The control marked SQUELCH affects the sen
nate radio interference from a co-channel user; they
sitivity of the set. It cuts off the loudspeaker except
when a signal is received, keeping the static and merely block out your reception of his communica
tions when your receiver is not activated. The signal,
the tube noise from being heard in the absence of a
however, although unheard, is still present. Accord
signal. When a signal on your channel is picked up
ingly, if you begin transmitting before checking to
by your receiver, the squelch automatically opens
see if the channel is clear you may interfere with
and lets it through. When the station stops trans
mitting, the squelch takes over and shuts off your another transmission or find your own message
blocked. To prevent this, FCC Rules require the
speaker. The short burst of noise heard at the end
of each incoming transmission, is due to the slight user of a selective calling system to bypass the sys
tem by throwing the appropriate switch and moni
delay of the squelch in cutting off the speaker. To
set the squelch-control, rotate it to one side until toring the channel before transmitting. This insures
a rushing noise is heard, then reverse it just far that emergency messages will have priority and that
enough to cut off the noise. If you turn it too far licensees will cooperate in using shared frequencies.
back,a weak signal may not be able to open the Once the set is on, and the VOLUME and
squelch. If you reverse it too far, you may be SQUELCH controls properly adjusted, you are
bothered by noise bursts opening the squelch.
ready to receive or make calls. To call, pick up the
Sometimes, at extreme range, the signal is so microphone and press the microphone button. This
weak that the squelch opens and closes rapidly, turns on your transmitter and cuts off your receiver.
chopping up the incoming signal. To correct this, Speak into the microphone and, after saying
