Fixed Station; Digital Display Calibration - Kenwood TS-120S Operating Manual

(6) Battery Capacity
The power system of a motor vehicle is comprised of a
battery and an alternator (when generates power while the
engine is running) to supply current to loads or to charge the
battery.
Since the transceiver draws hi current, during transmit care
should be excersised so the power system is not overloaded.
When using the transceiver, the following points should be
observed from the viewpoint of battery maintenance:
@ Turn the transceiver OFF when the lights, heater, wipers
and other high-draw accessories are used.
@ Avoid transceiver operation when the engine is not run-
ning.
@ If necessary, use an ammeter and/or a voltmeter to
check battery condition.
4.8 FIXED STATION OPERATION
4.8.1. Power
The TS-120V power requirement is 4A at 13.8 VDC when
transmitting with full power. The Kenwood model PS-20
power supply for fixed stations matches the TS-120V in
design and performance.
The TS-120S requires more than 18A at 13.8 VDC when
transmitting with full power. Use the Kenwood model PS-
30 power supply for fixed stations.
4.8.2. ANTENNA
Fig. 4-13 Rotary Beam Antenna
For HF fixed-station operation, an antenna specifically
designed for amateur operation is recommended. Antenna
types include the wire antennas, verticals, rotary beam, and
other antennas. HF antennas are quite large and must be in-
stalled to withstand strong wind, heavy rain, etc.
Any antenna used with the TS-120S(V) should be of 50-
ohm impedance and should be connected using an ap-
propriate coaxial cable such as RG-8/U.
Impedance matching is important. Impedance mismatching
will result in a high VSWR and power loss, or can cause un-
wanted harmonic radiation and interference (TVI, BCI).
The impedance match can be checked with an SWR meter.
Generally satisfactory operation is assured when the VSWR
(Voltage Standing Wave Ratio) is less than 1.5:1.
For impedance matching between the antenna system and
transceiver, use of the AT-120 Antenna Tuner (option) is
recommended. A rotary beam antenna is very effective for
DX operation in 14, 21 and 28 MHz bands. (Fig. 4-13)
4.9 DIGITAL DISPLAY CALIBRATION
4-14)
Connect the antenna and set the BAND switch to WWV.
Turn the main tuning dial to about 500" to receive the 15-
MHz WWY signal. Adjust the dial until a low-frequency
beat is heard. Next, depress the CAL switch and a marker
signal is superimposed on the WWV beat signal. A double
beat (two beat signals of high and low frequencies) will now
be heard.
While receiving this double beat, adjust the Counter unit
trimmer through the reference frequency adjustment access
opening (at the side of the TS-120S(V)) so the two beats are
heard as a single beat. This completes calibration of the
Digital Display. After calibration depress and release the
CAL switch.
os
Fig. 4-14 Digital Display Calibration
Trimmer
_ Access
Insulated tuning tool
First, remove cover
4.10 ANALOG DIAL CALIBRATION (Fig. 4-
15)
The main dial scale is graduated at 1-kHz intervals. One
revolution of the main dial covers 25 kHz. To calibrate the
scale, turn the CAL switch ON and in SSB mode zero-beat,
or in CW mode tune for an 800 Hz beat. Hold the main tun-
ing knob from rotating and slip the calibration ring to the
nearest major (5 kHz) graduation. The dial is now calibrated.
Note: For exact frequency, read the Digital Display.
Hold main dial
Turn Calibration ring
Fig. 4-15 Analog Dial Calibration