Instruction manual

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@ MOTOROLA INC.

Communications

Group

MOTOROLA HF.SSB

Automatic Antenna Tuner

Models T1961A and T1962A

Installation Procedure

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1. INTRODUCTION

(Referto Figure 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.

FAEPS-3000S-0

"5381

Figure 1. AutomaticAntenna 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.'

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.

@ Motorola, Inc. 1979

Printed in U.S.A.

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1301 E.Algonquin Road, Schaumburg, II.60196

68P81110E64-0

5/15/SD-PHI

Summary of content (22 pages)

PAGE 1
@ Communications MOTOROLA MOTOROLA HF.SSB INC. Automatic Antenna Tuner Group Models T1961A and T1962A Installation Procedure ~!tt~~~£~J*it~t!%;tit1~i~rJit*{{f~J;';~'i:~{:;:i;t~(~;~(I~4:~~~$~;g*~~4jtBjj~~;i:i;{;~1~~BitJ.tt~~;@~4~t.0~~~;~~~!~{' Jt~0f~&~lrRg~fi~ 1. INTRODUCTION (Refer to Figure 1.) .2. PREINSTALLA TION INSTRUCTIONS 2.1 1.1 Motorola HF-SSB Automatic Antenna Tuners, Models T1961A and TI962A, are antenna matching networks rated at 125 watts peak-envelope-power (PEP).
PAGE 2
.2 ""8 RADIO MODIFICATIONS 100 2.2.1 The TRITON 20 and TRITON 12 and 24 channel 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.
PAGE 3
J P/O TRN6227A TRN6429A TRN6430A as 09 .- ..'0"" . RIS R24 CR9 ""'-30011-0 ..r.
PAGE 4
3.2 LOCATION (Refer to Figure8.) CAUTION Regardless of antenna tuner mounting position, the selected drain hole must face downward. Selection of a location for the antenna tuner should be such that it is as close to the antenna as possible. Long "lead-in" wires greatly increase the possibility 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.
PAGE 5
-- Table 3. Control Cable Parts List Step 1. Assemble the control cable as illustrated in Figure 10and as directed in Figure 11. (; Step 2. Insert the completed I5-pin plug into the antenna tuner connector of the TRITON radio. . For a detailed parts breakdown of the TRN4423A see PEPS-30lOS. at the rear of this manual. Connector Step 3. Route the other end (solder lugs) of the control cable through the vessel to the antenna tuner.
PAGE 6
,. 4. GROUND SYSTEMS (Refer to Figures 14 and 15.) 4.1 R.F. COAX A common ground for the entire radio system (radio, dc power supply, antenna tuner, etc.) is required 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.
PAGE 7
. ANTENNA COPl'ER SCREEN ANTENNA TUNER BULKHEAD FEED- THRU INSULATOR " \) METAL WATER TANK ~} GROUND PLATE GBEPS-30016--D 7 '7 Figure 14. Ground System on Fiberglass Vessel ~ ~~"'-l 1/4 WAVE RADIALS AT FREQUENCIES OF OPERATION LEAD-IN WIRE GAEPS-30017 -0 Figure 15.
PAGE 8
J~ '!. A=c== . . 2 1;00--1--~--' I f 5 5 i ~'<-4 3 ~ :, - L 1 j - a ~m ~' - ft Q" 12 7 GBEPS-:JO103-0 Figure 16. Control Cable Parts Detail ;? parts I I$t TRN4423A Connector CODE ...... "--\ ~~J. 15~"QJ GAEPS-30104-Q Figure 17. Housing Parts Detail TRN4423A Connector Kit Parts List Motorola No. PEPS-30105-0 51151SG-PHI 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 PL.6953-O Kit MOTOROLA PART NO. 29-83883C08 42-82018H02 7-82232L01 7-82233L01 3-115613 4-135651 42.10217A02 5.
PAGE 9
@ /'~ $ MOTOROLA Communications Group INC. MOTOROLA HF -SSB AUTOMATIC ANTENNA TUNER MODELS T1959A, T1961A, T1962A 1. DESCRIPTION 1.1 Motorola HF-SSB automatic antenna tuners are antenna matching networks rated at 125 watts peak-envelope-power. Selection of the network components for antenna matching is performed by a microprocessor-based circuit that monitors antenna conditions each time a channel is changed. The entire tuning process usually takes less than one second.
PAGE 10
3. PRE-OPERATIONAL CHECK 3.1 The antenna tuner is thoroughly checked and inspected at the factory. However, if the tuner is to be installed in a remote location or stocked on a shelf for several months, a pre-operational check on a service bench is recommended. 3.2 the radio system (with the antenna being replaced by an antenna simulator circuit). The recommended set-up is shown in Figure 2. NOTE A TKN8119A Mobile Antenna Matching Harness must be used when checking a mobile whip antenna.
PAGE 11
3.3 -"~ Circuits for construction of the antenna simulator are shown in Figures 4 through 6. NOTE Figures 4 and 5 apply only for 23 to 60 foot antennas, whip or long wire. } mode) of 3 :t 1 watts into a 50-ohm load. Refer to the radio instruction manual for the procedure for adjusting the radio power level in the tune mode. 3.6 Check the tuner operation by following the procedure given below. Step 1. Set up the components of the radio installation as shown in Figure 2. P l OHMS 900 = .EPS' ..
PAGE 12
4.2.2 If the equipment surfaces are dirty, wash the external surfaces with mild soap and water using a clean cloth. Be careful not to allow the electronic components or connectors to get wet. 4.2.3 Preventive maintenance should be scheduled regularly, i.e. monthly, quarterly, annually. The interval of maintenance depends on equipment usage and environment. 4.
PAGE 13
the channel selection knob. If channel change is initiated by the A/B button, the tune line circuit is used to <'1 the tuning sequence. Refer to the paragraph that } initiate describesthe tune line circuit. .' 5.3.5 Tune Power Detector The tune power detector consists of U5A, U6A, and U6B. A voltage proportional to the forward power from the transmitter output is applied to U6-5.
PAGE 14
microcomputer memory and begins the termination of tuning sequence. 5.4.6 Termination of Tuning Sequence U8-33 goes high to allow the radio to revert to the receive mode. The microcomputer memory retains a list of the circuit elements that were switched in when the sequence ended. Circuits elements remain selected until there is a voltage transition at ANT TUNE (VIa), SWITCHED A + (GRN), or CHANNEL CHANGE (BLU). Tuner operation following these transitions is described in the following paragraphs. 5.4.
PAGE 15
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PAGE 16
TUNER DOES NOT INITIATE TUNING SEOUENCE WHEN RADIO CHANNEL IS CHANGED AND VSWR > ~:I TUNER DOES NOT INITIATE TUNING SEOUENCE WHEN RADIO IS SWITCHED ON AND VSWR > ~:1 DISCDNNECT PA DlSA8LE/CHANNEL CHANGE CONNECTIO FROM RADIO NO TROUBLESHOOT VSWR DETECTOR CI RCUIT CHECK SWITCHED A+ CIRCUIT IN RADIO TROUBLESHOOT ANT TUNE LINE CIRCUIT IN RADIO YES GROUND THE PA DISA8LE/CHANNEL CHANGE LINE (Bll CHECK VOLTAGE AT U8-28, 34, 38 TROU8LESHOOT TUNE POWER DETECTOR AND VSWR DETECTOR NO f REPLACE FUSE YES T
PAGE 17
TUNER DOES INITIATE TUNING SE~UENCE WHEN RADIO IS TURNED ON, BUT FULL POWER VSWR > 4:1 OES NOT TUNING :E WHEN -jANNEL iED AND 4:1 CTPA 'HANNEL JNNECTION 10 NOT OK NO TROUBLESHOOT CHANNEL CHANGE CIRCUIT IN TUNER REPLACE ANY BAD RELAY OR DRIVER NO YES THE PA NOT OK 'CHANNEL LINE (BLUI OLTAGE 3,34,38 TROUBLESHOOT PHASE DETECTOR CIRCUIT 7 PERFORM VSWR DETECTO R TEST PROCEDURE NO oEEPS-30866-0 'NELCHANGE )PERA TING :HECK /NEL 'CUlT.
PAGE 18
--- .----- -- ------\ \ \ \ \ < I " . K" : UO / j / " ., / V \ KI2 (NOTEII L29 \ \ / " ~OTE " \ KI3 INOTEIII - \ I I I I I I l RF OUTPUT I I NOTES. I. MOUNTE 0 ON SOLDER SIDE OF BOARD.
PAGE 19
;- --- - - -- - --- - ".-- --- -.. -. -- - -.- -- ( I / i Lr ~, '1. RF 'N SWITCHED A+ PA D'SABLE/ CHANNEL CHANGE A NT TUNE NOT CONNECTED j I \ \ \ \ \\ .. .
PAGE 20
. -"'-. PHASE Rr INPUT .J.U. ov { O.ZV TO 1.0VP'p T .I -*- j\!\!\, NOTE5 C169 - .os I DETECTOR WAVEFORM AT U2.13 HAS SAME PHASE AS RF INpUT CURRENT. OUTPUT OF U20 IS A SOUARE 0.9V-,- WAVE. -+.... R32 1.51< R97 II< D R98 II< U3 FUP-FLOP OUTPUTS USD OUTPUT IS LOW I CAPACITIVE. USD OUTP, PHASE IS INDUCTIVE. Rl10 ~ .TI< R99 II< VOLTAGE ACROSS THE REVERSE pOw VOL TAGE IS APPLIE RIOO tl< RI. 2.2K .05 WAVEFORM AT UI.SHAS SAME PHASE AS RF .LCISS .
PAGE 21
DURING CAP PHASE U6-9, 3.2 V U6-&4.' V DURmG IND PHASE U6-9,4.' V U6-8' 3.2 V VSWR DETECTOR ". c. 8P, '5V : .51< I T I CRZ '.71< 1m C8 "Z SW A' R. R. ....... 18. -if- 1 .7P, REVERSE R6 POWER 101< LEVEL .51
PAGE 22
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