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CONTROLS
AND THEIR FUNCTIONS
e
POWER switch
Turns
the
AT-250
power
ON-
OFF. Before turning the switch
ON
or
OFF,
check
that
the
TUNER
switch
and
the TUNE
switch are set to OFF.
e
POWER-SWR
meter
Indicates
transmit
power
and
SWR. The power scale has two
readings, up to 20 W and up to
200 W, selected by the METER
switch.
e
TUNER indicator
Light ON: The signal passes
through
the
antenna
tuner.
Light
OFF:
The
antenna
tuner is through.
|
e
TUNER switch
ON:
Transmit
signal
passes
through
the
antenna
tuner.
RX
IN-OUT
switch
setting
(rear'panel) and the TUNER
switch setting.
OFF:
The
antenna
tuner
is
*'through" in all modes.
Receive signal depends on the
e
ANTENNA switch
Since 4 antennas can be connect-
ed to the unit, select the desired
antenna
when
changing
_fre-
quency or bands.
e
TUNE indicator
Lights when
auto tuning is
in operation. Goes off when
auto tuning is complete and
the motor stops.
e
TUNE switch
Used to activate the auto tuning
function.
With
the
TUNER
switch ON, setting this switch to
ON provides an SWR of less than
1.2:1. After auto-tuning is com-
plete and
the
TUNE
indicator
goes off, set the switch to OFF
and
operate
the
transceiver.
When
operating
the transceiver
with
this
switch
at
ON,
the
motor may activate during opera-
tion. With the switch to ON, the
receive
signal
does
not
pass
through the antenna
tuner even
with the RX IN-OUT switch on
the rear panel set to IN.
e
DC/AC
switch
Used to select DC or AC power
source. Be sure to set the switch
to DC or AC, depending on the
power source Selected.
e
RX IN-OUT switch
|
Before
shipment,
this switch is
set to OUT,
With
this setting,
only
a
transmit
signal
passes
through the antenna tuner. With
the switch set to IN, both trans-
BO
100
206
sot
Pisnubrend
™
6 10 20 w
S18 23
6 60
e
BAND switch
Set to the desired ham band be-
tween
1.8 and 28 MHz, corres-
ponding to the frequency to be
used. With a TS-430 transceiver,
set the switch
to AUTO.
The
desired
band
setting is automa-
tically selected
by the TS-430.
mit
and
receive
signals
through the antenna tuner.
pass
e
ACC jack
Rt1
Band
B2
information ¢ cz
input
02
WRC
RL2
View from unit inside
Detail of the AT-250 ACC terminal
(transmit
information
input for
TS-430, 13.8 V when transmitting)
H 3.4V
LOV
(transmit information
input for
transceiver other than TS-430,
grounded when transmitting)
An input jack for controlling the AT-250. Using the control cable
supplied, connect the transceiver to this jack.
The following are band informations
fed to the ACC jack.
Band}
D2
C2
B2
A2
|WRC
1.8 | L(O) | L(O) | H(t) | LO) | LCo)
=
3.5 L(0) | L(o) | HC) | HC) | C00)
7
L(O) | HCI) | L(O) | HCO) | LC)
10
L(O) | HCI) | HCI) | LO) | HG)
14
L(O) | HOI) | HOH) | HCL) | LO)
18
H(1) | L(O) | L(O) | L-(O) | HO1)
21
H(i) | L(O) | L(O) | LO) | Lo)
24.5, H(1)
L(G) | L(O) | HOI) | HOI)
28
| H(1) | L(o) | L(o). H(1) | LC)
goes
e AC power connector
When
AC
power
(120,
220 or 240 V selectable)
is to be used, connect the
supplied AC cable here.
e
METER
switch
Used to select power or SWR in-
dication. For power indication,
20 W or 200 W can be selected.
For
SWR
indication, set
the
switch to SWR. No calibration is
required, since this is an auto-
matic instrument.
e
DC power connector
When DC power (13.8 V) is to be
used connect here.
e POWER VOLTAGE
SELECTOR switch
With this switch, on the
bottom panel, select your
local line voltage.
e
INPUT jack
Input jack for the antenna turer -
Connect the transceiver antema
jack to this INPUT jack.
Connect
the
transceiver
GND
e
GND terminal
|
GND
terminal
for the AT-250.
terminal
to
this
terminal.
Grounding the terminal prevents
TVI and BCI.
e ANT 1 — ANT 4 jacks
Coaxial antenna jacks. Connet
antennas corresponding
to yar
Operating frequency range.
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