9
4. Operation
If you do not have the battery pack, use a DC 12.5 V power supply (The battery pack is
optional. Not included in the rig).
Warming-up time
It takes about 10 minutes for the TJ5A to stabilize. A drift of 10 – 20 Hz might be noticed
during the warming-up period.
To receive signal
Connect the antenna and turn on the power. Signals or noise can be heard. Rotate the
TUNE knob to the frequency you want. For compactness, TJ5A has no band switch.
Therefore, use fast tuning rate (For example, 10 kHz or 100 kHz) as the band switch to get
to the meter band so as to save time, and then use the fine tuning rate (10 Hz, 100 Hz, 1
kHz) to search signals or
tune accurately. Rotating RIT
facil260 Hz/-150Hz
frequency
shift.
However,
RIT
does
not
affect
transmitting
frequency.
In
transmission
the
shift
is
canceled automatically. RIT
is usually set in the middle
position.
TJ5A is pre-set to broadband receiving, covering from 3.5 – 29.7 MHz. However,
narrowband receiving is possible by re-arranging the jumper caps on the main board.
Open the upper cover of TJ5A, the jumper caps are easy to find. Remove the caps from
JP3 and JP4. Place the caps on JP1 and JP2 to select narrow band receiving. In this case,
TJ5A operates in 40, 20, 15, and 10 meter segments:
Meter Band
Frequency Range
40m
7.000000 – 7.300000
20m
14.000000 – 14.350000
15m
21.000000 – 21.450000
10m
28.000000 – 29.700000
