PROCEDURE TO RECEIVE AND TRANSMIT
A. MICROPHONE
The receiver and transmitter are controlled by the push-to-talk switch on the
microphone. Press the switch and the transmitter is activated, release switch to
receive. When transmitting, hold the microphone two inches from the mouth
and speak clearly in a normal voice. The 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.
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 weaker signals will not be heard.
6. Set the
CHANNEL
selector switch to the desired channel.
7. Set the
RF GAIN
control fully clockwise for maximum RF gain.
8. Adjust the
CLARIFIER
control to clarify the SSB signals or to optimize
AM signals.
C. PROCEDURE TO TRANSMIT
1. Select the desired channel of transmission
2. Set the
MIC GAIN
control fully clockwise.
3. If the channel is clear, depress the push-to-talk switch on the microphone and
speak in a normal voice.
RECEIVING SSB SIGNALS
There are three types of signals presently used for communications in the
Citizens Band : AM, USB, LSB. When the MODE switch on your unit is
placed in the AM position, only standard double-side band, full carrier signals
will be detected. An SSB signal may be recognized while in the AM 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 side
band and lower side band respectively, and standard AM signals.
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 which 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.
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.
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.
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.
- 12 -
- 11 -
Zeon PDF Driver Trial
www.zeon.com.tw