Frequency Calibration; Reading The Frequencies - Kenwood TS-700A Operating Manual

Note: Calibration for both USB and LSB is unnecessary:
when the dial is calibrated for either one, it will
automatically cover the other one.
Frequency Calibration for CW
The transmit frequency for this mode is about 900 Hz
below that for the calibrated position for LSB. For calibra-
tion, simply set the "O"" mark on MAIN dial against the
triangle mark "y" at the center of the dial gauge after
calibrating according to the above method.
Frequency Calibration for FM and AM
Beating by the marker signal in the manner mentioned
above does not occur in this calibration. The exact tuning
point is obtained where the meter exhibits a maximum
deflection by a carrier frequency. In calibrating for FM, use
the marker signal. To precisely calibrate your TS-700A to
the marker signal, adjust the MAIN TUNING knob until the
center meter pointer may deflect to the center spaced on the
scale line.
4-4. READING THE FREQUENCIES
Refer to Fig. 10. Approximate frequency can be read
only on the sub-dial; however, the MAIN dial and dial
gauges should be used if accurate reading on the order of
1 kHz is required.
When your transceiver is to be operated on CW mode,
vary the beat frequency by turning the MAIN TUNING knob
from higher side to lower side (counterclockwise rotation)
while receiving the desired signal from the other party.
Reduce the beat to zero by so turning the knob, and then
rotate the knob upward (clockwise rotation) to obtain a beat
frequency of about 900 Hz. Under this condition, read the
frequency on the MAIN dial by referring to the triangle mark
"~" Note that a beat frequency is present on both sides of
the "zero-beat" point; one is a strong main beat and the
other is a weak residual beat. Be sure to go by the main
beat in your tuning operation
The frequency of USB in
this illustration is 720 kHz.
SUB-DIAL shows 700,
MAIN DIAL shows 20.
USB frequency =
700 + 20 = 720 kHz
This reading is to be added
to the basic frequency
selected by BAND switch.
If BAND switch setting is
"144 MHz," and if MODE
switch is in "USB," then
the operating frequency in
this illustrated example is:
144.720 MHz =
(operating frequency)
144.00 MHz + 720 kHz
LSB Fj; — USB
Fig. 10 Reading the Frequencies
16
Note: Tuning in the residual beat will result in failure of
"zero in" to the frequency of the other party.
The residual beat can be easily discriminated from
the main beat because the "S" meter deflects little
even when the residual beat is tuned in about
900 Hz.
4-5. OPERATION WITH FIXED CHANNEL
The Model TS-700A has built-in semi-synthesizer
crystal oscillator circuit for use in fixed channel operation,
which is of great advantage where the transceiver has to be
Operated frequently on certain frequencies. Examples of
such a situation are: operation in frequently used FM mode,
mobile operation in SSB, communications based on
schedules of the other party, mobile operation in a vehicle,
etc.
When FIX CH knob is switched from VFO to any of fix-
ed channels, the channel indicator lamp lights up as long as
the selected channel is loaded with a crystal. The FIX CH
knob has a total of 11 fixed channel position; 1,2,3...11.
The oscillation frequency of fixed channel crystal can
be obtained from the following formula:
Crystal Oscillator Frequency for FM, AM and CW
DNDNNDOADOANNNNNNNNAN ANANDA NNDNNANAN ANDO A N N A N ,
Crystal oscillator frequency (MHz) = X — (125.10 +
10.70)
X = Desired operating frequency (MHz)
125.10 (MHz) = Heterodyne frequency for 144
MHz band
10.70 (MHz) = Transmitter IF frequency
DNNNNNNADONNNNNNNG
DNDN
3
DOADANNANNNNNNNNNNNNNNNNNNNNNADNONNNANNNNNANADNDDOANIADNRE
The TS-700A employs a MIX (synthesis) system. If
crystals are arranged for 144 MHz band (144—145 MHz),
they are also used for 145 MHz (145—146 MHz),
146 MHz (146—147 MHz) and 147 MHz
(147—148 MHz) bands by switching the BAND switch,
where the three places of decimals of the 'MHz' figure
remains the same.
When crystals are arranged for 144.48 MHz, the fre-
quencies obtained for each band are as follows: