@ MOTOROLA INC.
MOTOROLA HF.SSB
Communications
Group
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Automatic Antenna Tuner
Models T1961Aand T1962A
Installation Procedure
1. INTRODUCTION
(RefertoFigure 1.)
1.1 Motorola HF-SSB Automatic Antenna Tuners,
Models T1961A and TI962A, are antenna match-
ing networks rated at 125 watts peak-envelope-power
(PEP). Model T1961A Antenna Tuner matches the im-
pedance of an end-fed antenna (vertical whip or random
length wire) into a nominal 50-ohm impedance source
with a frequency range from 2-to-18 MHz. Model
T1962A Antenna Tuner performs the same impedance
match, but it can be used only with a 23' whip antenna
and at a frequency range from 2-to-9 MHz.
1.2 AutomatiC tuning is accomplished through
microprocessor control of reed relays that switch
inductors and capacitors in and out of the matching net-
work. The balance of this installation procedure
describes preinstallation instructions, installation in-
structions and ground systems for the radio and the
antenna tuner.
.2. PREINSTALLA TION INSTRUCTIONS
2.1 TUNE POWER ADJUSTMENT
....
, "7 CAUTION
The following adjustments to the
TRITON 20 or TRITON 12 and 24 chan-
nel radios must be performed before mak-
ing electrical connections to the antenna
tuner.
2.1.1 TRITON 20 Adjustment
Step 1. In the TRITON 20 instruction manual
(68P81044E20), refer to the TRN4038A Power
Amplifier circuit board overlay and schematic.
Step 2. With the radio in the TUNE MODE, adjust
potentiometer R441 for 3 watts :t 1 watt of power out-
put into a 50-ohm resistive load.'
FAEPS-3000S-0
"5381
Figure 1. AutomaticAntenna Tuner
@ Motorola, Inc. 1979
All Rights Reserved
Printed in U.S.A.
2.1.2 TRITON 12 and 24 Channel Adjustment
Step 1. In the TRITON 12 and 24 channel radio in-
struction manuals (68P81O30E35 and 68P81O34EO5),
refer to the TLN1752A Power Amplifier circuit board
overlay and schematic diagram.
Step 2. With the radio in the TUNE MODE, adjust
potentiometer R41 for 3 watts :t 1watt of power output
into a 50-ohm resistive load.
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1301 E.Algonquin Road, Schaumburg, II.60196
68P81110E64-0
5/15/SD-PHI
2.2
RADIO MODIFICATIONS
2.2.1 The TRITON 20 and TRITON 12 and 24 chan-
nel radios require circuitry modification if (hey
were built before July 1, 1980. Those radios built after
this date do not require the following modifications. All
the components required for these modifications are in
a small package of parts supplied with the antenna
tuner. Since components for both radios are included,
some components are not used, depending upon which
radio is modified.
2.2.2 TRITON 20 Modifications
(Refer to Table 1, and Figures 2 and 3.)
The TRITON 20 modification consists of the ad-
dition of 2 components to a circuit board.
Step 1. In the TRITON 20 instruction manual, locate
the TRN4032A "A" circuit board overlay and
schematic diagram.
Step 2. Select the components listed in Table 1, and
install the diode and resistor as illustrated in Figure 2.
Table 1. TRITON 20 M odijication Parts List
""8
100
8.0V
CR110
J3-1O
9T
CR21
PADISABLE
CR12
TD ROt
Figure3.
TRITON 20SchematicDiagramModijications
2.2.3
tions consist of changes made on two separate circuit
boards. The first modification is done to the main cir-
cuit board by addition of components listed in Table 2.
Figures 4 anCb.Sillustrate where these components are in-
stalled. The- second modification is done to the
transmit/receive switch circuit board by the addition of
components listed in Table 2. Figures 6 and 7 illustrate
where these components are installed.
TRITON 12 and 24 Channel Radio
Modifications
(Refer to Table 2 and to Figures 4 thru 7.)
The TRITON 12 and 24 channel radio modifica-
CA19
A198
CA110
CA12
CAUTION
Early versions of 12 and 24 channel
TRITON radios must have resistor R44
on TLN17S2A Power Amplifier changed
to a 3.3k ohm, SOJo,1/4 watt resistor for
proper antenna tuner operation.
Step 1. In the TRITON 12 and 24 channel radio in-
struction manuals, locate the TUAlllOA or TUA1120A
Universal Radio Chassis and Main Board "M" overlay
and schematic diagram.
Step 2. Select the components (CRSI9 thru CR523
and RSI8) listed in Table 2, and install the diodes and
resistor as illustrated in Figure 4. Use sleeving on the
component leads.
Table 2. TRITON 12 and 24 Channel Radio
a16
""'-30007-0
IC><OI
Modijication Parts List
Figure2.
TRITON 20CircuitBoardModifications
2
J
09 as
RIS R24 CR9
CR4
P/O
TRN6227A
TRN6429A
TRN6430A
.- ..'0"" .
""'-30011-0
..r.<o,
'.J
I .
v
P/O TRNS229A
TRNS867A
TRNS66SA
RSla
F :JOCOO-O
'.SAOI
Figure4.
TRITON 12and 24 ChannelMain CircuitBoard
Modifications
CATHODE OF CR41' «RANGE 11
CATHODE OF CR41T ,(RAHGE Z)
PIO IIAHOSWITCHIHG
CIRCUITRY SECTION ON
AWN BOORD"" CATIiOOE OF Cll419 «(RANGE 41
CATHOOE OF C114t. ((RANGE 31
1
CATItODE OF C114ZO ,(lUNGE 5)
CATHOD£ OF VR42S .d!'OD':5AOLE)
G£PS-3000.-o
Figure 5.
TRITON 12 and 24 Channel Main Circuit Board
Schematic Diagram Modifications
Step 3. In the instruction manual, locate the
TRN6227A; TRN6429A, or TRN6430A Transmit!
Receive Switch circuit board overlay and schematic
diagram.
Step 4. Remove resistor R24 (220 ohm) from the cir-
cuit board and lay it aside. It will not be used.
Step 5. Select the components (CR9 and R24) listed in
Table 2, and install the diode and resistor as illustrated
in Figure 6.
CRS19
"""20
"""21
CIISn
""SD
1tS1.
-
100
TRITON 12and24 ChannelSmall CircuitBoard
Figure6.
Modifications
024
.) (PO.DI:5A8LE1 ""9
11
-;;0
BEPS->OOIO-O
Figure 7.
TRITON 12 and 24 Channel Small Circuit Board
Schematic Diagram Modifications
(PO<'_BlT'(T
Q9
M9642
CRT
3. INSTALLATION INSTRUCTIONS
GENERAL
3.1
The procedure for a good installation is essentially
the same for either the Model Tl961A or Model T1962A
Antenna Tuner. If the Model T1961A Antenna Tuner is
employed, antennas of the end-fed variety of a 23-foot
whip or up to a 6O-foot long wire may be used with a
frequency range from 2 to 18 MHz. If the Model
T1962A Antenna Tuner is employed, its use islimited to
a 23-foot whip antenna with a frequency range from 2
to 9 MHz. The antenna should be installed as close as
possible or within a maximum of 3 feet of the tuner. The
ground system should be as close as possible or within a
maximum of 5 feet of the tuner.
3
3.2 LOCATION
(Refer to Figure8.)
Selection of a location for the antenna tuner
should be such that it is as close to the antenna as possi-
ble. Long "lead-in" wires greatly increase the possibili-
ty of creating radio frequency interference (RFI) with
other electronic equipment on the vessel. There are two
factory installed angle brackets attached to the bottom
of the antenna tuner for mounting purposes. Several
holes and slots are provided on each bracket. It is not
necessary to remove the brackets to mount the tuner.
CAUTION
Regardless of antenna tuner mounting
position, the selected drain hole must face
downward.
NOTE
The dealer or installer must supply the
necessary stainless steel mounting hard-
ware.
GAEPS-30012-D
ANTENNA
TUNER
7
?
GAEPS-30013-0
Figure 9. Mounting Positions
3.4 GROUNDING
A good ground system is required for efficient
antenna tuner operation. Use the ground lug on the
antenna tuner for ground strap attachment. Ground
returns for the electrical circuits may be provided
through the deck or hull of the vessel if these are
metallic; otherwise, a copper strap four inches wide
should be installed from bow to stern. For more detailed
information regarding grounding, refer to. the
GROUND SYSTEMS section of this manual.
DRAIN SCREWS
Figure 8. Antenna Tuner Housing
3.3
DRAIN SCREW REMOVAL
(Refer to Figure 9.)
The antenna tuner has provisions for selection of
one of two drain screws for removal of condensation.
One screw is positioned on the bottom of the housing,
and the other is on the end of the housing. Proper orien-
tation of the drain hole is essential for normal tuner
operation. Remove and discard one screw from the sur-
face that will be at the lowest position when the tuner is
mounted.
4
WARNING
Do not install the antenna tuner without
an adequate ground system.
3.5 CONTROL CABLE ASSEMBLY AND
INSTALLATION
The control cable must be field assembled. Table 3
lists the items required for assembly of the cable. Of
those parts listed, the connector kit and solder lugs are
supplied with the antenna tuner, but the 3-conductor
cable must be supplied by the dealer or the installer. The
following steps outline the control cable assembly and
installation procedure.
--
(;
Table 3. Control Cable Parts List
.For a detailed parts breakdown of the TRN4423A Connector Kit,
see PEPS-30lOS. at the rear of this manual.
MAIN
BRACKET
CABLE
RETAINER
I ',~
Step 1. Assemble the control cable as illustrated in
Figure 10and asdirected inFigure 11.
Step 2. Insert the completed I5-pin plug into the
antenna tuner connector of the TRITON radio.
Step 3. Route the other end (solder lugs) of the control
cable through the vessel to the antenna tuner.
3-GONDUCTOR
CONTROL
CABLE
WIRE
EYELET
IS-PIN CONNECTOR
()
I-~/I
(31
SOLDER LUGS
STEP 1:
STRIP INSULATION
11<SOLDER LUG
TO EACH CONTROL
WIRE.
~
~
STEP B:
PULL CONTROL CABLE
BACK INTO MAIN
BRACKET SOTIE-WRAP
IS FLUSH WITH
BRACKET OPENING.
ATTACH STRAIN RELIEF
OVER TIE-WRAP AND
SNAP CABLE 11<STRAIN
RELIEF INTO BRACKET.
,. -J .LREW
~
STEP 2:
FEED CONTROL
CABLE THROUGH
HOLE IN MAIN
BRACKET.
, '
P
STEP 9:
LOCK SIDE BRACKETS TO
CONNECTOR TABS
AND INSERT SCREWS SECURING SIDE
BRACKETS TO MAIN BRACKET.
'~~
10F'
1 OF 3 CONNECTIONS SHOWN
Figure 10. Control Cable Assembly
STEP 3:
STRJP In" OFF
OUTER JACKET.
STRIP INSULATION
BACK II'" ON EACH WIRE.
STEP 7:
ATTACHTJE-WRAP 1/B'" FROM
OUTER JACKET EDGE.
STEP .:
ATTACH EACH
CONTROL WIRIOTO
CHOKE-PIN ASSEMBLY
THROUGH AN EYELET
AND SOLDER.
STEP S:
SLI DE HEAT
SHRINKABLE TUBING
OVER ASSEMBLY
11<SHRINK.
---
~
Q
CONNECTOR
MATING
SERRATIONS
DOWN
GBEPS-30047-0
~;::~EACH
CONTROL WIRE WITH
CHOKE-PIN ASSEMBLY
INTO ANTENNA TUNE
CONNECTOR. REFER TO
FIGURE. FOR CORRECT
CONNECTIONS.
GBEPS-30070-0
,;
Figure 11. Control Cable Assembly Procedure
5
,.
4. GROUND SYSTEMS
(Refer to Figures 14and 15.)
R.F.
COAX
MOUNTING~
SCREW
Electrical and Mechanical Connections
Step 4. Route and connect the solder lugs of the con-
trol cable as shown in Figure 12. Tie-wrap the control
cable to the coaxial cable, and attach the lug housing
with mounting screw.
3.6 COAXIAL CABLE
(Refer to Figure 13.)
Use type RG-58/U or RG-8/U, 50-ohm, coaxial .
cable with the appropriate UHF connectors (PL-259) on
both ends to interface the RF OUTPUT from the radio
to the RF INPUT to the antenna tuner.
C~J':""
TRITON HF-SS8
RADIO
Figure12.
3 CONOUC1aI CASU:
CONtRO<. CIN€
~/
,13(') ANTT1JNE I
ro!MlNAl.S \
~
,w...
He
.rl Tl961AOR
_F
INPUT
\ ~ ORRGlIV COAX
BEPS-3OO1'-0
Figure 13. Electrical Block Diagram
-~
GAEPS-30071-O
'-AHTEHNA
TlKZA
ANTENNA
T\JNER
'--GOlD WG
GOlD STRAP
4.1 A common ground for the entire radio system
(radio, dc power supply, antenna tuner, etc.) is re-
quired for proper system performance. This type of
grounding is accomplished through the use of three inch
wide grounding straps terminating at the GROUND
LUG on the antenna tuner, which in turn is connected
to the antenna ground plane. When at all possible,
avoid multiple path ground connections. They result in
ground loops which may have high circulating currents.
On certain operating frequencies, ground loops cause
radio and/ or antenna tuner instability.
4.2 The ground strap to the antenna tuner must be
within a maximum of 5 feet of the tuner. If the
ground strap is long in terms of the operating frequency
wavelen'6th, it can actually present a high impedance to
the ground lug on the antenna tuner. As a result, the
antenna tuner is electrically "floating" above the
reference ground of the system.
4.3 An adequate system ground is usually easily ob-
tained on a metal hulled ship with a metal deck.
All communications equipment can be grounded to the
,metal structure of the ship at convenient places.
4.4 Wood and fiberglass vessels present more difficult
. grounding problems. Large ground straps are re-
quired to electrically bond equipment together, and an
artificial ground plane must be created. Either of two
methods is used to achieve the required ground plane:
ground plates or screening. Ground plates or screening
is installed inside the hull of the craft so that good elec-
trical contact with the' water is made through the
capacitive effect of the hull (dielectric). At least 100
square feet of the area below the water line is recom-
mended. Figure 14 shows an example of a ground
system where a ground plate is placed on the inside of
the hull of the vessel.
4.5 An artificial ground plane can be further improved
with the addition of copper screening connected
through a ground strap to the base of the antenna tuner
and placed in the immediate vicinity of the antenna
tuner. The antenna tuner should also be grounded to
copper pipes, the metal water tank, and the engine to ex-
tend the ground system. The addition of 1/4 wavelength
radials extending from the ground lug of the antenna
tuner creates a further improvement in system per-
formance. Figure 15shows a radial ground system.
.
.
J !
.
6
.
ANTENNA
~
COPl'ER
SCREEN
ANTENNA TUNER
"
METAL
WATER
\)
TANK
~}
GROUND PLATE
7
'7
Figure 14.
Ground System on Fiberglass Vessel
BULKHEAD
FEED- THRU
INSULATOR
GBEPS-30016--D
1/4 WAVE RADIALS AT
FREQUENCIES OF OPERATION
Figure 15. Radial Ground System
~~"'-l
LEAD-IN WIRE
GAEPS-30017 -0
7
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