TRC-490 AM/SSB CB Transceiver
(210-1583) Controls and Functions Faxback Doc. # 46653
This short description of the function of each control and jack supplies
background information for proper operation. For actual Operating
Instructions, refer to "Using Your Transceiver" in Faxback Doc. # 46654.
MICrophone - The dynamic microphone must be connected to this
jack. To Transmit, press the button on the mic and
talk into the mic. To Receive, release the button.
When transmitting, hold the microphone at an angle,
two or three inches (5-7.5 cm) from your mouth and
speak clearly in a normal voice. Your Transceiver
features a new locking type microphone connector.
This insures that you won't accidentally pull out
or loosen the plug connection (when extending the
MIC cable while moving about). To release the MIC
connector, you must press the small Tab on the Top
and then pull out.
PHONES - Plug in communications type headphones for private
listening, or in areas where background noise is
excessive (factories, at the scene of an accident
or fire, etc.). When you plug in the headphones,
it automatically disconnects the internal speaker
(or an external speaker).
Channel Selector - Use to select any one of the standard 40 CB
channels.
VOLUME with "ON/OFF" - Turn clockwise to apply power to the unit and then
switch adjust for the desired level of sound from the
speaker. When using PA, it controls the level of
the PA output.
SQUELCH - Sets the level of the internal Squelch circuitry to
cut out the background noise when no signal is
being received. When properly set, it allows
signals to come through, but cuts off the receiver
sound when no signal is being received, thus
eliminating annoying background/atmospheric noise
during standby and monitoring conditions.
If set too high, you may miss some of the weaker
signals. Operating conditions will determine the
best setting.
RF GAIN - Varies the sensitivity of the RF amplifier stages
of the Receiver circuitry. For normal operation,
set RF GAIN to maximum and adjust VOLUME for a
suitable listening level. Under high-signal
conditions, you may want to turn RF GAIN down a
little and raise VOLUME as required.
CLARIFIER - Functions as a "fine tuning" (or "delta" tuning)
for reception of Single Side Band and AM signals
when the Mode switch is set to either LSB or USB.
This permits you to tune your receiver to exactly
the same frequency of any other station or stations
which you are communicating with.
AM-USB-LSB Mode - Set this switch to the desired mode of operation
Switch for both transmit and receive. When in the AM
position, both transmitter and receiver sections
are operative for AM. When set to the LSB
position, the Receiver operates to receive only the
Lower Side Band portion of a signal; the Receiver
operates only to receive the Upper Side Band
portion of a signal; the Transmitter will transmit
only the Upper Side Band of the modulated waveform.
PA push-button - Controls the function of the audio amplifier/
modulation circuitry when the Microphone button is
pressed. When the PA button is in the "out"
position, the Microphone button turns the
Transmitter on for normal transmissions. When you
press the button in, the Transmitter will not
function - the Microphone turns on the Public
Address Amplifier function. For PA operation you
must have a PA speaker connected to the PA jack on
the rear chassis.
ANL/NB push button - Press in to cut out annoying hash-type and impulse
type noises. Press again to release this function.
NB (Noise Blanker) is particularly effective for
ignition noise on both AM and SSB, while ANL
(Automatic Noise Limiter) is effective for AM
signals.
RF-S Meter - Gives visual indication of signal strengths. When
receiving, the RF-S Meter shows the strength of
incoming signals; a change of one "S" unit
indicates a change of 6 dB in signal strength. The
meter is set up so that a 100 microvolt signal will
produce a reading of S-9. When Transmitting, the
RF-S meter gives a relative indication of output
power from the Transmitter.
PA + CB RECEIVE push - Press in both ANL/NB and PA to activate PA
button operation plus CB RECEIVE function; you can monitor
the CB signal from your PA speaker when the
microphone button is released.
CH 9 Switch - Press in and you instantly jump to channel 9.
Press again to release this function and
Transceiver will return to the previously selected
channel.
Channel 9 Indicator - Lights up when you are using the "instant" Channel
LED 9 function.
THE REAR PANEL:
PA SPeaKeR Jack - Connect an 8 Ohm Public Address speaker to this
jack for PA use. We recommend RadioShack's
40-1244, weatherized, rugged PA Speaker, as an
ideal unit for either PA or External Speaker
application.
External SPeaKeR Jack- If you want to use an external speaker, plug it
into this jack. You should use a standard 8 Ohm
type. When a miniature (9/64", 3.5 mm) phone plug
is inserted into this jack, the built-in speaker is
automatically disconnected.
ANTENNA Coax - Connect your CB antenna to this (SO-239 type,
Connector accepts PL-259 connectors).
FUSE - Is for protection of the Transceiver and its source
of AC power. If the Transceiver does not operate
from AC power, check this fuse - replace only with
the same type and value (4 amp).
13.8V DC Connector - This cable is to be connected to a source of 12-16
and Power Cable volts DC power, negative or positive ground. The
with in line fuse Red wire with the in-line fuse must be connected to
the (+) side and the Black wire to the (-) side.
120V AC POWER CORD - Plug into a source of 120 volts, 60 Hz AC power.
DC-AC Switch - Selects the power source, DC or AC.
(BR/eb 10/12/98)
Privacy Policy