Motorola HF-SSB T1961A Installation Procedures Manual

@

MOTOROLA

INC.

Communications

Group

MOTOROLA HF.SSB

Automatic Antenna Tuner

Models

T1961A and T1962A

Installation Procedure

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1. INTRODUCTION

(Refer to 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 1 watt of power output

into a 50-ohm resistive load.

@ Motorola,

Inc. 1979

All Rights Reserved

Printed in U.S.A.

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1301 E.Algonquin Road, Schaumburg, II.60196

68P81110E64-0

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