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loro
AT-250
CAUTION
1) The AT-250 is capable of sustaining 100W con-
2
FEATURES
1.
tinuous operating input power. However, during
auto
tuning,
very
high voltage appears
in the
tuning circuit and the reflected impedance
for
the transceiver varies greatly. Therefore, to pro-
tect the transceiver, adjust the transmit output
to less than 50W before tuning.
The antenna tuner is capable of matching a 20—
150
ohm
load, or approximately
up to 2.5:1
SWR.
If the antenna and feed system exceed this
range, the tuner may not stop, since it is beyond
the auto tuner's
capability.
In this case, do not
attempt further auto-tuner operation.
To perform auto-tuner operation, first adjust the
antenna and feed system.
You are the owner of our latest product, the new AT-250
Automatic
Antenna Tuner. Please read this instruction manual carefully before
placing your unit in service. The unit has been carefully engneered
and manufactured
to rigid quality standards,
and
should give you
satisfactory and dependable operation for many years.
3) The antenna tuner enables to reduce SWR
of
high SWR antenna.
To transmit
power
efficiently,
use
the lower
SWR antenna correctly adjusted.
All amateur bands covered in the HF range
4. POWER-SWR
meter
Covers all amateur bands including the new WARC
band
from
1.8 through 28 MHz.
. Automatic band selection
When
connected
to the TS-430,
the operating
band
is
automatically selected from the transceiver.
- Dual power source capability
Operation from either 120, 220, or 240 V AC or 13.8V
DC.
Up to either 20 W or 200 W is indicated by the 5u ilt-in
POWER-SWR
meter. When
the METER
switch i; set to
SWR, SWR
is autoamtically
calculated and indiated on
the scale.
. Four antenna jacks
Four antennas
cover
a broad
frequency
range. Arty of
these antennas can be selected by the ANTENNA switch
on the front panel.
In normal operation (with the RX switch OUT), ml-y the
transmission
signal will pass through the antenn
¢ uner.
AG SY
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