Kenwood AT-250 User Manual

loro
1H
AT-250
AUTOMATIC
ANTENNA
TUNER2=
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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Kenwood AT-250 Specifications

Frequency and Impedance

frequency range	1.8 — 29.7 MHz
input impedance	50 ohms unbalanced
output impedance	20-150 ohms unbalanced

Power

pass through power	100W (200W PEP)
power consumption	15W AC
power requirement	120V, 220V, or 240V AC selectable

Dimensions and Weight

dimensions	W174 (174) x H96 (107) x D257 (289) mm
package dimensions	W385 x H167 x D264 mm
weight	4.2 kg (9.24 Ib.)