PROCEDURE TO RECEIVE AND TRANSMIT
RECEIVING SSB SIGNALS
A. MICROPHONE
There are four types of signals presently used for communications: FM, AM, USB
and LSB. When the MODE switch on your unit is placed in the AM position, only
standard double-side band and in FM position, only frequency deviation, full carrier
signals will be detected. An SSB signal may be recognized while in the AM or FM
mode by its characteristic "Donald Duck" sound and the inability of the detector to
produce an intelligible output. The USB and LSB modes will detect upper sideband and
lower sideband respectively, and standard AM signals.
The push-to-talk switch on the microphone controls the receiver and transmitter. Press
the switch and the transmitter is activated, release switch to receive. When transmitting,
hold the microphone two inches from your mouth and speak clearly in a normal voice.
This transceiver comes complete with a low impedance dynamic microphone.
B. PROCEDURE TO RECEIVE
1. Be sure that power source, microphone and antenna are connected to the proper
connectors before going to the next step.
SSB reception differs from standard AM reception in that an SSB receiver does not
require a carrier or opposite side band to produce an intelligible signal. A single-side
band transmitted signal consists only of the upper or the lower side band and no carrier
is transmitted. The elimination of the carrier from the AM signal helps to eliminate the
biggest cause of whistles and tones heard on channels that make even moderately strong
AM signals unreadable. Also, SSB takes only half the space of an AM channel,
therefore two SSB conversations will fit into each channel, expanding the 40 AM
channels to 80 SSB channels. The reduction in channel space required also helps in the
receiver because only half of the noise and interference can be received with 100% of
the SSB signal.
2. Turn
VOL
knob clockwise to apply power to the radio.
3. Set
the
VOL
for a comfortable listening level.
4. Set
the
MODE
switch to the desired mode.
5. Listen to the background noise from the speaker. Turn the
SQ
knob slowly
clockwise until the noise just disappears. The
SQ
is now properly adjusted. The
receiver will remain quiet until a signal is actually received. Do not advance the
control too far or some of the weaker signals will not be heard.
An SSB signal may be received only when the listening receiver is functioning in the
same mode. In other words, an upper side band signal (USB) may be made intelligible
only if the receiver is functioning in the USB position.
6. Set
the
CHANNEL
selector switch to the desired channel.
7. Adjust
COARSE/FINE
control to clarify the SSB signals or to optimize AM/FM
signals.
If a lower side band (LSB) signal is heard when the receiver is in the USB mode, no
amount of tuning will make the signal intelligible. The reason for this may be
understood if you consider that when the modulation is applied to the transmitter's
microphone in the USB mode, the transmitter output frequency is increased whereas in
the LSB mode the transmitter's output frequency is decreased.
C. PROCEDURE TO TRANSMIT
1. Select the desired channel of operation.
2. Set
the
MIC GAIN
control fully clockwise.
The result in listening to the receiver is that when the MODE switch is in the proper
position (either USB or LSB), a true reproduction of a single tone of modulation will
result, and if the tone is increased in frequency (such as a low-pitched whistle or a high-
pitched whistle) you will hear the increase in the output tone of the receiver. If the
incorrect mode is selected, an increase in tone of a whistle applied to the transmitter
will cause a decrease in the resultant tone from the receiver.
3. If the channel is clear, depress the push-to-talk switch on the microphone and speak
in a normal voice.
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