power socket
on rear panel of the
transceiver. The
red
lead at the power
cable connects to the
positive [+]
pole
of the battery or electrical system and
the
black
lead connects to the
negative [—]
pole of the battery or
suitable chassis ground.
4.
Mount the microphone hanger to
any convenient location close the
transceiver.
Noise Interference
There are several kind of noise inter-
fering you may encounter in base station
operation. Some of these noise sources
are, from nearby commercial broadcast,
electrical appliance, lawnmower etc., flo-
rescent buzz, static from electrical storms.
Commercial products are available to
reduce interference from these sources.
Consult with your dealer or CB/amateur
radio supply shop.
Antenna
Only a properly matched antenna
system will allow maximum power trans-
fer from the
52 ohms
transmission line
to the radiating element.
Note
that except
in special circumstances approved by
P and T
depertment, the use of parasitic
or driven elements to provide aerial gain
is not permitted. However, reactive load-
ing of aerials may be employed. A ver-
tically polarized quarter wave length
antenna provides the reliable operation
and greater range. We suggest vertical
ground plane antennas are omni-
directional that provide optimum per-
formance for contacting other fixed
stations using vertical type antennas in
additional to all mobile stations. For a
short range communications within build-
ings, from building to building, or
mobile [dc] operation, a short center-
loaded whip antenna is available for use
with your transceiver. A standard antenna
connector is provided on the transceiver
for easy connection to a standard cable
termination.
Remote Speaker Connection
The external speaker jack [marked
EXT SP] on the rear panel is used for
remote receiver monitoring. The external
speaker should have 8 ohms impedance
and be able to handle at least 3 watts.
When the external speaker is plugged in,
the internal speaker is disconnected.
Public Address
An external 8 ohms, 3 watts speaker
must be connected to the
PA SP
jack
located on the rear panel when the trans-
ceiver is used as a public address system.
The speaker should be directed away from
the microphone to prevent acoustic feed-
back. Physical separation or isolation of
the microphone and speaker is important
when operating at high output levels.
Control Functions
There are
10
controls and 2 indicators
on the front panel of your
Apollo-IV.
Power Switch.
Depress to apply power
to the transceiver.
Tone.
This switch changes tonal
quality of received sound.
Hi
position
sounds high-pitched and
Lo
position
sounds soft, respectively.
Volume/PA.
Turn clockwise to set the
desired listening level or PA level.
Squelch.
This control is used to cut
off or eliminate receiver background noise
in the absence of incoming signal. For
maximum receiver sensitivity it is de-
sired that the control be adjusted only
to the point where the receiver back-
ground noise is eliminated. Turn fully
2
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