Terra TX 760D User manual
OPERATION/INSTALLATION MANUAL
Trimble
2105 Donley
Austin, Texas 78758
(512) 432-0400
PUBLICATION NUMBER 82619
PRINTED IN U.S.A.
TX 760D
VHF COMMUNICATION TRANSCEIVER
OPERATION/INSTALLATION MANUAL
Trimble
2105 Donley
Austin, Texas 78758
(512) 432-0400
DECEMBER 16, 1996
PUBLICATION NUMBER 82619
REVISION B
PRINTED IN U.S.A.
TX 760D
VHF COMMUNICATIONS TRANSCEIVER
T-1
Title Page
Page A
Revision A
November 25, 1996
Terra by Trimble TX 760DVHF Communication Transceiver
LIST OF EFFECTIVE PAGES
Insert latest change pages and destroy superceded pages.
Page Description Page no. Date
Title Page T-1 November 25, 1996
List of Effective Pages A November 25, 1996
Record of Revisions B November 25, 1996
Table of Contents (Main) TC-1 - TC-2 November 25, 1996
Section I - Introduction 1-1 - 1-4 November 25, 1996
Section II - Installation 2-1 - 2-10 November 25, 1996
Section III - Installation Drawings 3-1 - 3-14 November 25, 1996
Section IV - Operation 4-1 - 4-6 November 25, 1996
Section V - Warranty 5-1 - 5-2 November 25, 1996
Section VI - Installation Bulletins/Notes 6-1 -6-2 November 25, 1996
Dates of Change pages are:
Revision...........A .........November 25, 1996
Page B
Revision A
November 25, 1996
Terra by Trimble TX 760DVHF Communication Transceiver
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Revision A
November 25, 1996 TC-1
TX 760D VHF COMMUNICATIONS TRANSCEIVER
OPERATION/INSTALLATION MANUAL
TABLE OF CONTENTS
SECTION I ...............................................................................................................................1-1
1. INTRODUCTION..........................................................................................1-1
1.1 SCOPE ..............................................................................................1-1
1.2 DESCRIPTION .................................................................................1-1
1.3 SPECIFICATIONS ...........................................................................1-2
1.4 EQUIPMENT SUPPLIED ................................................................1-3
1.5 ADDITIONAL EQUIPMENT REQUIRED .....................................1-4
1.6 LICENSE REQUIREMENTS...........................................................1-4
SECTION II..............................................................................................................................2-1
2. INSTALLATION .......................................................................................... 2-1
2.1 GENERAL ....................................................................................... 2-1
2.2 PREPARATION FOR USE ..............................................................2-1
2.3 GENERAL INSTALLATION INSTRUCTIONS
FOR AVIONICS .............................................................................. 2-1
2.4 INSTALLATION..............................................................................2-5
2.5 ANTENNA INSTALLATION .........................................................2-9
2.6 OPERATIONAL CHECKOUT ........................................................2-9
2.7 FINAL INSPECTION .......................................................................2-7
SECTION III ............................................................................................................................3-1
3. INSTALLATION DRAWINGS ....................................................................3-1
SECTION IV ........................................................................................................................... 4-1
4. OPERATION .................................................................................................4-1
4.1 SCOPE ..............................................................................................4-1
4.2 OPERATION ....................................................................................4-1
4.3 FREQUENCY MODE ......................................................................4-1
4.4 NORMAL OPERATION ..................................................................4-1
4.5 FREQUENCY TRANSFER .............................................................4-2
4.6 COMM TUNING KNOB OPERATING SEQUENCE ....................4-2
4.7 MEM (MEMORY) OPERATING SEQUENCE ..............................4-2
4.8 TO PROGRAM A NEW FREQUENCY INTO MEMORY ............4-3
4.9 DISPLAY BLANKING OPERATION.............................................4-3
4.10 VOX INTERCOM OPERATION.....................................................4-4
4.11 EMERGENCY OPERATION ..........................................................4-4
4.12 BLIND OPERATION .......................................................................4-5
4.13 FAILURE MODE OPERATION......................................................4-5
4.14 SAFEGUARDS OPERATION .........................................................4-5
TC-2
Revision A
November 25, 1996
SECTION V .............................................................................................................................5-1
5. WARRANTY................................................................................................ 5-1
5.1 LIMITED WARRANTY OF TERRA BY TRIMBLE PRODUCTS5-1
SECTION VI ............................................................................................................................6-1
6. INSTALLATION BULLETINS/NOTES ......................................................6-1
6.1 INSTALLATION BULLETINS .......................................................6-1
6.2 INSTALLATION NOTES ................................................................6-2
Revision A
November 25, 1996 1-1
SECTION I
1. INTRODUCTION
1.1 SCOPE
This manual provides installation and operation instructions for the Terra by Trimble TX 760D
VHF Communications Transceiver manufactured by Trimble of Austin, Texas.
1.2 DESCRIPTION
TheTerra by Trimble TX 760D is a small, lightweight, all solid-state, amplitude modulated, 5
watt VHF transceiver. The TX 760D provides simplex communication on any one of 760
channels with 25 KHz spacing. Featuring a planar gas discharge digital display, the TX 760D
provides active and standby frequency indication, memory, and knob operated frequency
selection.
The TX 760D features a digital frequency synthesizer that employs one crystal for generating
the frequencies required for transmit and receive functions on all 760 channels. Other
features include automatic voice leveling on transmit, crystal monolithic I.F. filters, integrated
circuit I.F. amplifiers, and internal two place VOX intercom capability. Use of a low noise
MOSFET RF amplifier, automatic squelch circuit with manual override, solid-state antenna
switching,switchingpowersupplywithoverloadprotection,andmicroprocessorcontrolled
frequency selection and monitoring make the TX 760D a reliable answer to today’s
communicationrequirements.
The transceiver can be mounted in two different configurations; in a single tray or in a dual
tray. All power and control connections are made through a 15 pin “D” type connector
installed on the rear of the mounting tray. A BNC chassis connector is used for antenna
connections. The TX 760D is secured by means of a positive locking cam, accessible through
the front panel, using a 7/64" Allen wrench.
Weighing only 1.50 lb. (0.680 kg), the TX 760D measures 11.45" long, 3.125" wide, and 1.625"
high (29.08 cm x 7.9375 cm x 4.1275 cm). Panel cutout is a 3.03" x 1.54" (7.6962 cm x
3.9116 cm) and overall length of the unit is 13.05" (33.147 cm) including mounting tray.
The TX 760D is very power efficient, requiring only 325 mA of standby current and 2.5 A
during transmit. Operation at 27.5 VDC is possible by utilization of an optional Terra by
Trimble MLC 28-5 power converter. The TX 760D is designed to operate with standard
aircraft microphones, headsets, speakers, auxiliary audio inputs and 50 ohm broad-band
communication antenna systems.
1.3 SPECIFICATIONS
1-2
Revision A
November 25, 1996
The following are pertinent specifications for the FCC type-accepted Terra by Trimble Model
TX 760D transceiver.
1.3.1 MECHANICAL SPECIFICATIONS
Mounting: Panelmounted usingmountingtraysuppliedwithunit
OverallDimensions: 13.05"long,3.125"wide,1.625"high(33.14cmlong,7.9375
cm wide, 4.1275 cm high)
MountingDimensions: 11.45"behindpanel,
3.125"wide, 1.625"high (29.08cm behindpanel, 7.9375cm
wide,4.1275cm high)
PanelCutout: 3.03" x 1.54" (7.692 cm x 3.9116 cm)
Weight: 1.50 pounds (0.680 kg)
Connectors: Antenna input/output; BNC Interconnect; 15 pin “D” type
1.3.2 POWER REQUIREMENTS
The Terra by Trimble TX 760D transceiver requires 13.75 VDC +10%, -20% input at
2.5ampsmaximumloadcondition.
1.3.3 ENVIRONMENTAL SPECIFICATIONS
MaximumOperatingConditions
Altitude: To 30,000 feet (9,150 meters)
Humidity: To 95% at 50 C (122 F)
Temperature
Range: -20 C (-4 F) to +55 C (+131 F)
Vibration: 0.5 G from 5 to 500 Hz
1.3.4 ELECTRICAL SPECIFICATIONS
(All specifications at 13.75 VDC nominal)
RECEIVER
Frequency Range: 118.00 to 136.975 MHz
Number of Channels: 760
ChannelSpacing: 25 KHz
Sensitivity: Less than 2 µV for 6dBm signal plus noise to noise ratio.
Selectivity: Typically -6dBm at 14 KHz and -60 dBm at 40 KHz.
SquelchSensitivity: Automatic: 2 to 5 µV
Manual: 25 to 150 µV
AutomaticGain
Control(AGC): Audio flat within 3dB for 3 µV to 30,000 µV input.
Undesired Response: Greater than 60dBm down.
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