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CONNECTIONS
Po Connection with the TS-430
ANT
3.
ANT
2
ANT
1 ANT
4
VY
AT-250
KEY
REMOTE
©
EXT
SP
ACC
O
-
RX
b 8. O
SS
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3. Connect antennas to ANT jacks (1—4) in accordance with
an operation band.
7
« Connection with a transceiver other than the TS-430
|
able) or 13.8 V DC. Then set the DC/AC switch on the
rear panel to AC or DC, according to the power source
used.
TS-130
AT-250
EXT
SP
f fave
RX
H
q IN
ACC
ANT 3
ANT 2
ANT 1
EXT VFO REMOTE
AC
OUT
O
C)
DC13 8V 0 6A
KEY
O
CJ
GNO
ANT 4
INPUT
cca
<C>
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|
C7
~ C4
~——+t _ Remote
tL
Cable
(B)
\
_/
Fig. 2
|
j
To AT-250 ACC Terminal
Connect the AT-250 ACC jack to the transceiver REMOTE
To Be
eid
° P|
rina
jack with the remote cable (B) supplied. (Fig. 3)
(View from the
cord
s!
(Plug view)
Connect the AT-250 ACC pin (3) so that the pin is grounded
when transmitting.
Fig. 2 shows connection to a TS-130. The TS-530 and TS-
Shielded
cable
4-pin wire into the 7-pin connector and operate the tuner
from the TS-930 control relay.
To
operate
with
a transceiver
other than
a TS-430,
dis-
regard the AUTO setting of the AT-250 BAND switch.
Manually set the switch to the correct band.
Connect
pin (3) so that it is
grounded when transmitting.
Reception
Transmission
Fig. 3 Remote cable B
= Connection with a linear amp.
Caution: Do not supply the TL-922 output to the AT-250.
TL-922
TS-430
'
- AT-250
;
,
II ane
wey PemorE|
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|
Ce = (0)
c
iN
ace
ANT 3
ANT?
ANT 1
f
x o
2
O
g A
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OC
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9
O
"Eq
GNO
ANT 4
NPY
GNO
pean
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RL
GNO
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TS
_
La
Black
_
Red
|
RF OUTPUT
When connecting the AT-250 to the KENWOOD
TL-922/
922A
linear amplifier, use a connecting cable which
is 1
meter or less long.
| TS-4308 }——{_AT-250 no
TL-922
++
When
operating
with
a transceiver other than the TS-430,
use the REMOTE
terminal
as shown
in Fig. 5. However, a
linear
amplifier
controlled
by plus voltage
can
be used.
(Never use a linear amp controlled by minus voltage.)
OPERATIONS
Use a cable being 1m or
less long.
A linear amplifier emitting minus
voltage
when
receiving
cannot
be used.
\To linear amp
one
Fig. 5
>
Pin 3
Reception
~%\
- \ To AT-250
Transmission
ACC Terminal
View from the cord side
Initial set-up before operation
Set the POWER
switch to OFF.
Set the TUNER
switch to OFF,
et ane
Set
the
ANTENNA
switch
to any
one
of ANT1—ANT4,
corresponda-
ing to the antenna connected.
s
Antenna SWR measurement
1. Turn the AT-250 POWER switch ON.
2. Operate
the
transceiver
to transmit
with
reduced
CW
Power (50 W or less), in the TUNE mode.
3. Place the METER
switch to SWR and the antenna SWR
will be automatically
calculated
and displayed
on the
meter.
Note: To activate the SWR
meter, adjust the transmitter to
obtain a power output of slightly more than 3 W.
When the SWR
is less than 1.5:1, further SWR adjustment is
not necessary.
However,
if it is over 1.5:1 or when further
SWR
adjustment is required, operate the antenna tuner to
obtain a better match, in order to operate the transmitter
efficiently.
» Auto tuning
1, Place the transceiver in the receive mode, and the TUNER
and the TUNE switches to ON.
2. In the configuration, transmitting activates auto tuning
and lights the TUNE
indicator.
3. When the SWR
reaches 1.2:1 or less, the motors stop and
the TUNE
indicator goes off. In this state, turn the TUNE
switch
OFF
and reset
the transceiver
to the operating
mode desired. The transmitter is ready for normal opera-
tion.
Set the TUNE
switch to OFF.
Set the METER
switch
to either
20 W or 200 W, according to the
max.
power
output
of the trans.
ceiver used.
Set the BAND switch to the requir.
ed band.
For
operation
with
the
TS-430, set it to AUTO.
The antenna tuner is capable of matching
a 20—150 ohm
load, or approximately
up to a 2.5:1
SWR.
If the an-
tenna and feed system exceed this range, the tuner may
not stop, since it is beyond the auto tuner's capability . If
the tuner does not stop within 20 seconds, discontraue
auto-tuner operation and verify the VSWR of your system.
If, after changing bands, the auto antenna tuner doe: not
stop at match within 20 seconds, momentarily returns to
the receive mode, and then again operate the tuner for a
match.
Note: The AT-250 is capable of sustaining 100W continous
_ Operating input power. However, during auto tunisg,
very high voltage appears in the tuning circuit ani the
reflected impedance for the transceiver varies gratly.
Therefore, to protect the transceiver, adjust the tans-
mit output to less than 50W before tuning.
e Antenna tuner in receive mode.
In normal
operation, the AT-250 allows the transmitting
signal to pass through the unit. However, setting the R) 1#N/
OUT switch to IN allows the receiving signal to pass thtywigh
the unit. With the TUNE switch ON, the receiving signd by-
pass
the unit.
With the TUNE switch ON, the recewing
signal is allowed to pass through the unit even with th RX
IN/OUT switch set to IN. The status of the unit cn
be
monitored by the TUNER indicator.
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