Kenwood AT-130 User manual

The Model AT-130 is designed to satisfy your
antenna-tuning requirements.
It has been manu-
factured with the quality and performance that
makes Kenwood "The Pacesetter in Amateur
Radio".
This unit has been carefully engineered and manu-
factured under rigid quality standards, and should
give you satisfactory and dependable operation
for many years.
Should any trouble arise with this unit, please
contact the authorized
KENWOOD dealer from
whom you purchased the item.
AFTER UNPACKING
Shipping Container: Save the boxes and packing
in the event your unit needs to be transported
for remoteoperation, maihtenance, or service.
The following explicit definitions apply in this
manual.
NOTE: If disregarded, inconvenience only.
No risk of equipment damage or per-
sonal injury.
CAUTION: Equipment damage may occur, but
not personal injury.
FEATURES
1. The AT-130 is a high performance H F antenna
tuner and
is a modification of the popular
AT-200 antenna tuner. The AT-130 is sma!l
and light, and is suitable not only for opera-
tion in your HAM shack but also for mobile
or field operation.
2. The AT-130consists of an antenna coupler,an
SWR meter, and an antenna switch.
3. The AT-130 is designed to be used on the w
Amateur bands between3.5 MHz and 30 MHz.
4. Antenna MATCHING or THROUGH opera-
tion is BAND-switchselected.
5. The SWR meter operates in both THROUGH
and MATCHING modes.
6. A mounting bracket is included for mobile
operation.
7. The panel meter can be illuminated by an
external power source.
8. The antenna matching circuit is also effective
in reducing TVI since
it acts as a band-pass
CONTENTS
................
AT-130 Specifications 3
Section 1. Preparation for Use .......... 4
.... Section 2. Controls and their functions 5
Section 3. Operation ................ 6
Section 4. Circuit Description .......... 9
Section 5. Additional Information ..... 10
Schematic Diagram
................. 11

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Accessories:
Carefully unpack your AT-130 Antenna Tuner
and verify the following accessories are included.
* Operating manual .. . .. .. . . 1 copy
* Mounting bracket (J29-0402-02) .. 1 piece
* Mounting hardware
Screw,
4 mm diameter ... .. . .
4 pieces
Flat washer,
4 mm diameter . . .
4 pieces
Lock washer,
4 mm diameter . . 4 pieces
Nut,
4 mm diameter
. . .. . . . 4 pieces
Wing Bolt,
4 mm diameter
(~09-0007-05) . . . 4 pieces
Polyethylene washer
. . .. . ..
4 pieces
*
2P power plug (~09-0203-25) .. . .
1 piece
*
Ground lug (~23-0015-04). . .. . .
1 piece
Cut end of cable even. Using a sharp
knife or razor, score and remove the
sheath
- Don't cut the braid.
Slide the coupling over the cable, and
carefully solder the connector. Make
certain the insulation is not melted by
InterconnectionCable
To connect your
- AT-130 with the TS-130S(V).
or other transceiver, an interconnection cable is
required.
Refer to Figure1
-1 for details.
Meter LampPower (Figure
1-21
Power for the meter lamp is supplied from an
external power source. Use the supplied
2 PIN
plug for power-supplyconnection. Observe pola-
rity.
I Figure 1-2. Meter Light Power Connection 1

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SECTION 2. CONTROLS AND THEIR FUNCTIONS
I -
-
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PULL LAMP ANTENNA TUNER AT- 130
r 71 r 71
Figure 2-1
I
Frontview
1. Meter
The meter reads SWR (standing-wave ratio) and
may be illuminatedby an external power source.
2. CAL (Calibrate)/SWR Switch
To measure SWR, first
set this switch to the
CAL
(1) position. Adjust the CAL control until
the meter pointer swings to the CAL line on
the meter scale.
Then depress the switch tothe SWR
(1) position,
and read the SWR.
3. CAL (Calibrate)ControlIMeter Lamp Switch
Before measuring SWR, this control
is used to
calibrate the meter. Adjust
as described above
in item
2. The meter lamp lights when the
control
is pulledON.
4. BAND Switch
Set this switch to the band in which you are
operating. The BAND switch also has
a
"THROUGH" position at which the antenna is
connected directly to the transceiver. SWR can
also be measured
at the THROUGH position.
CAUTION: DO NOT operate the band switch
while transmitting. Equipment
damage WI LLoccur.
5. RTUNE
The
R TUNE adjusts the resistive component of
antenna impedance.
b
6. X TUNE (~ransmit~unin~)Control
The
X TUNE adjusts the reactive component of
antenna impedance.
Figure
2-2. Rear View
1. Serial No. Plate 4. INPUT Connector
This plate
is stamped with the Serial Number of The INPUT UHF connector accepts the H
F input
your unit. signal fed from the antenna connector on the
2. GND post transceiver.
Connect the GND post to the transceiver GND
5. ANT Connector
stud. Use as short a cable as possible, using the The ANT UHF
connector accepts the antenna
supplied ground lug. coaxial cable.
3. 12V DC
Accepts 12V DC for meter illumination. Use the
supplied plug.
NOTE: Viewed from the rear, the right terminal
is POSITIVE.

Measuringantenna system SWR
(i) Using an all solid-state transceiver (such as a
TS-130sor TS-130V)
Before setting up the antenna coupler, first
determine the antenna system SWR.
a. Set the controls as shown inFigure3-2.Set the
BAND switch to the "THROUGH" position.
b. Inthe transmit mode, calibratethe meter with
the calibrationcontrol.
c. Depress the CALISWR switch to the SWR (1)
position and read SWR. If the SWR is lower
than 1.5:1 the antenna system impedance
is sufficiently matched for practical use. If
above 1.5:1, tune the system.
NOTE: In the event of too high an SWR (over
10:
I), check the antenna system for
breaks or
a short circuit.
(ii)Using a tube power amplifier transceiver (such
as a TS-820)
Connect the transceiver (or transmitter) and
dummy load (orantenna)through the AT-1
30 as
shown inFigure 3-3. Before adjusting the antenna
coupler, you should first know the antenna sys-
tem SWR.
Connect the dummy load to the ANT connector
and adjust the transceiver (or transmitter) final
tuning. Then, replace the dummy load with the
antenna and measure the antenna-systemSWR.
NOTE: During antenna measurements, your
transceiver may be operating under
heavy loadingconditions.
el
Your signal may also interfere with
other stations. Use the least amount of
power possible, and complete measure-
ments as quickly as possible.
Ground lead
Figure 3-1. Interconnection
Coax.
T
I:
BAND R TUNE
CAL
PULL
LAMP @
ANTENNA
k
1 1
Switch out set
CAL ( control
Figure 3-2. Switch Settings
6
, \

Adjusting the Antenna Coupler
The antenna coupler
is used to match a trans-
mitter to an antenna system when
its SWR is too
high
(i.e., greater than 1.5:1 SWR).
a. Place the BAND switch to the same band
setting as your transceiver
(as shown in Figure
3-41,
b. Set the CALISWR switch to the CAL (I)
position.
c. Transmit and adjust the CAL control so the
meter indicatesCAL.
d. Place the CALISWR switch in the SWR
(,)
position.
e. Ncw you will measure the reflected power.
Adjust the R TUNE and
X TUNE controls
alternately for
a good minimum meter indica-
tion. Reflected power will be close to zero
as
a good match is achieved.
Table
3-1 shows approximate control positions
for coupler adjustment.
Table 3-1
I BAND(MHz1 I R TUNE I X TUNE I
-- -p
B. ANT System
A. Dummy load
TS-820 orother Transceiver
f-- 1 I I .- .-a ~. - 1
-
-
000 AT- 120 ANT
First tune upon
- -
I i oo!l I
A Dummy load.
4 1 Then check
I19 M
-
I I oooll I! - - ll _ .. . .-
antenna SWR.
necessary.
r71
-
-- .~
Coax.
INPUT
Coax.
GroundCable
Figure 3-3. Inter Connection
-Adjust alternately for minimum
4
SWR reading.
BAND R TUNE
X TUNE
PULL LAMP @ ANTENNA TUNER AT- 130
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.',
Figure 3-4.

AT-130 Mobile Installation .
Securely installthe Mobile Mount using four lock
washers, four flat washers, and four screws and
nuts. Install the AT-130 in the MobileMount by
four wing bolts and polyethylene washers. Adjust
the tilt before tightening the bolts.
Mounting bracket
Figure 3-5. Mounting bracket Detail
Figure
3-6. Adjusting the Mounting Angle

Figure11 shows a block diagramof the AT-1 30.
Direcltional Coupler
The directional coupler samples forward and
reflectedpower fromthe transceiver tothe load.
Meter Circuit
The forward and reflectedpower sampled by the
directional coupler
is used for SWR measure-
ment. Forward power
is calibratedwith the CAL
control so reflectedpower is read as SWR.
BandSelector Switch
This selects the band to which the matching
circuit
is tuned. In the "THROUGH" position,
Idthe antenna is connected directly to the trans-
- ceiver, bypassing the coupler, while still allowing
SWR measurement.
Antenna Coupler
The universal matching circuit
is capable of
matching
20 to 300n loads to the 50a input
impedance.
1
ANTENNA
COUPLER
INPUT
I
METER
CIRCUIT
@ n
ANT GND
Figure 4-1. AT-130 Block Diagram
i
DIREC-
TIONAL
COUPLER
-c
BAND
SELEC---c
TOR

1. General lnformation
Your AT-130 has been factory aligned and tested include
a photocopy of the bill of sale,
or other proof of purchase showing the
to specification before shipment. Under normal date of
sale.
circumstances, it wili operate inaccordance with
these operating instructions.
If your unitfails to work, contact the authorized
dealer from which you purchased it for quick,
Dear OM, if you desire to correspond on
a technical or operational problem,
please make your note short, complete,
reliablerepair. and to the point. And PLEASE make
Attempting service without factory authorization
it readable.
can void the unit's warranty. Please list: Model and serial number.
2. OrderingSpare Parts The question or problem you are
When ordering replacement or spare parts for having.
Please give sufficient detail to diagnose; other
your equipment, be sure to specify the following:
T -
equipment in the station, meter readings and
Model and serial number of your transceiver, anything you feel might be useful in attempting
w
Schematic number of the part. Printed circuit diagnosis.
3. Service
You may return your unit for service either to
the Authorized Kenwood Dealer from whom you
purchased
it or to Trio-Kenwood. A copy of the
service report will be returned with the unit.
Please do not send sub-assemblies or printed
circuit boards-send the complete unit, in
its
original boxes and packing.
You need not return accessory items unless they
are directly relatedtothe service problem.
4. Dial Litelnformation
Part
# B30-9996-00
Rating 12V 40mA
To replace:
1. Remove top cover.
2. Note position of all leads on S meter and
lampP.C.B.
3. Remove all leads from meter and lamp
P.C.B.
If you want verification of receipt, please supply 4. Remove meter bracket.
a self-addressed card (or letter) and we will
5. Remove 2 brass Philips screws holding
inform you of the date of receipt and estimated lamp P.C.B. to meter.
service time. 6. Swing P.C.B. rear edge up and out.
NOTE: When claiming warranty service, please 8. Reverse disassembly procedure.
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