Transmission - Kenwood TS-600 Operating Manual

and is free from saturation even when the input signal
strength is very high, thus eliminating the need for calibra-
tion for each mode of operation.
Since the IF band is wide in FM mode, a slight devia-
tion of frequency does not affect the reception. In transmit-
ting operation, however, the other party could be using a
fixed channel. Because of this possibility, it is advisable that
you "zero in'' your frequency to that of the other party by
properly setting the MAIN dial in the manner that the
center meter pointer may deflect up to the center space.
If the "S' meter continues to fluctuate or if satis-
factory audio output is not available, if is very likely that
the other party is sending the message on SSB. You can
easily check this by turning the MODE switch to USB or
LSB position.
SSB Mode
Of the single sideband mode, USB is traditionally
more often used than LSB. As far as the operating tech-
nique is concerned, there is no difference between two.
Generally, the "zero in'' technique in SSB mode re-
quires a little experience.
A. Discrimination between SSB and FM
(1) Use of "'S'' Meter
If the ''S'' meter indication is steady (meter pointer almost
stops), the incoming signal is FM; otherwise, it is SSB.
(2) Use of MODE Switch
lf a clear signal is heard at the FM position of the MODE
switch, the signal is FM. The sound in SSB mode is not
heard at this position of the switch.
(3) Use of Beat Noise
In FM mode, a beat noise will be heard between the words
of signals being received. In SSB mode, no beat noise is
heard.
Note: !n the case of AM waves, a beat noise will be heard
during non-modulation time even in SSB mode.
B. Dial Setting
When the receiving signal is found to be SSB by the
above method A, in USB first set the MAIN dial a few kHz
below the receiving frequency (turn the dial 2 or 3 divisions
counterclockwise). You will hear a high pitch sound such as
is heard from a magnetic recording tape set in the fast-
forward mode. Turn the dial clockwise for higher frequency
and the sound will become clearer. Set the dial at the posi-
tion where the sound is heard most clearly (this is the ""zero
in" point).
Note: 1 The "zero in" point can be easily located because
the sound loses its clarity suddenly when the dial
Passes away from the "'zero in" point.
If a clear sound cannot be heard even by following the
above procedure, it may be an indication that the signal is
LSB. Set the MODE switch to LSB position. In this case,
the method of setting the MAIN dial should be performed
in reverse order.
Note: 1. If the frequency of the other party is deviated after
the "zero in" point has been obtained, set the RIT
switch to ON and adjust the RIT knob.
2. When the RIT feature is used, the receiving fre-
quency will be deviated from the transmitting fre-
quency. Therefore, the RIT knob must be set to
"O" or the RIT switch to OFF before you start to
transmit again.
AM Mode
AM waves cannot be demodulated in FM mode; also,
they will be heard as a continuous beat noise in SSB mode.
Optimum reception of AM signal is secured by turning the
transceiver in such a way as to maximize the deflection of
the "'S' meter pointer. Since the bandwidth of the receiver
crystal filter is somewhat narrow because this filter is
primarily for SSB reception, the sound output of the
speaker may have its high pitch components suppressed.
This can be remedied by shifting the receive frequency
a little by using the RIT knob. The same effect can be
produced by means of the MAIN dial but the use of this
dial for that purpose is not recommendable because, should
you do so, you will not be able to "zero in' your
transmit frequency to the frequency of the other party.
Where your transceiver and that of the other party
are both TS-600, it should be noted that, in AM mode, the
transmit carrier frequency is 10.7006 MHz which is lower
than the receive carrier frequency by 600 Hz.
Accordingly, you first ''zero in'' your frequency to
that of the other party by adjusting your MAIN dial and
send out the signal, to which the other party will respond
after possibly changing his frequency. If he should do so,
the pointer of your ''S" meter then would deflect down
from the initial maximum level indication; this drop must
not be interpreted as a sign of trouble. In such a case, you
are expected to re-match your frequency to the new incom-
ing frequency by using your RIT knob with the RIT switch
set to ON (refer to Fig. 4 on page 10.)
4-2. TRANSMISSION
Before transmitting, perform all the necessary pro-
cedures for optimum reception. Make sure that the radio
waves you have selected does not interfere with other radio
stations.
Adjust the controls and knobs (DRIVE knob, micro-
phone VR, etc.) for transmission of good quality signals.
Connect a 50-ohm dummy load or antenna to the trans-
ceiver before starting to adjust the various controls. The
use of dummy load is recommended because this prevents