Reading The Frequencies; Operating With Fixed Channels - Kenwood TS-600 Operating Manual

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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. The position at which the center meter
indicates the "0" position is where the FM frequency is
turned correctly. Set the MAIN dial against the center posi-
tion of the dial gauge as in the case of CW.
4-4, READING THE FREQUENCIES
Refer to Fig. 8. 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 lower side to higher side (clockwise 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 downward (counterclockwise rotation) to
obtain a beat frequency of about 900 Hz. Under this con-
dition, read the frequency on the MAIN dial by referring
to the triangle mark ''v''. 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 turning operation.
The frequency of USB in
this illustration is 220 kHz.
SUB-DIAL shows 200,
MAIN DIAL shows 20.
USB frequency =
200 + 20 = 220 kHz
This reading is to be added
to the basic frequency
selected by BAND switch.
If BAND switch setting is
"60 MHz," and if MODE
switch is in "USB," then
the operating frequency in
this illustrated example is:
50.220 MHz =
(operating frequency)
50.00 MHz + 220 kHz
LsB—¥;— USB
Fig.8 Reading the Frequencies
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 9N0 Hz.
4-5. OPERATION WITH FIXED CHANNEL
The Model TS-600 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
fixed 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 5 fixed channel position: 1, 2, 3..... 5.
The oscillation frequency of fixed channel crystal can
be obtained from the following formula:
Crystal Oscillator Frequency for FM, AM and CW
Crystal oscillator frequency (MHz) = (69.90—10.7) — X
X = Desired operating frequency (MHz)
69.90 (MHz) = Heterodyne frequency for 50 MHz
band
10.70 (MHz) = Transmitter IF frequency
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The TS-600 employs a MIX (synthesis) system. If
crystals are arranged for 50 MHz band (50 — 51 MHz), they
are also used for 51 MHz (51 — 52 MHz), 52 MHz (52 —
53 MHz) and 53 MHz (53 — 54 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 50.20 MHz. the fre-
quencies obtained for each band are as follows:
'
; 50 MHz band
: (69.90 — 10.70) — 50.20 = 9.00 MHz
: (70.90 — 10.70) — 9.00 = 51.20 MHz
: 70.90 = Heterodyne frequency for 51 MHz band
: 52 MHz band
; (71.90 — 10.70) — 9.00 = 52.20 MHz
;
;
'
'
&.
53 MHz band
(72.90 — 10.70) — 9.00 = 53.20 MHz
72.90 = Heterocyne frequency for 53 MHz band
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