VAL COM 76O TSO Operating instructions

COM 76O TSO
COM 76O TSOCOM 76O TSO
COM 76O TSO
VHF COMMUNICATIONS TRANSCEIVER
VHF COMMUNICATIONS TRANSCEIVERVHF COMMUNICATIONS TRANSCEIVER
VHF COMMUNICATIONS TRANSCEIVER
Installation / Owner’s Manual
Revision 6
August 1999

ONE YEAR LIMITED WARRANTY
The equipment delivered with this Standard Factory Warranty is manufactured by Val Avionics, Ltd. and is
guaranteed against defective materials and workmanship for one year from date of original retail purchase. Any unit
found to be defective due to material and workmanship during the warranty period will be repaired and put in
original manufactured operating condition. Any labor charges which are incurred as of said defects are included in the
warranty.
Val Avionics, LTD’s liability under this warranty is limited to servicing, repairing or adjusting any equipment
returned prepaid to the Val Avionics’ factory by express written or verbal authorization for that purpose and to repair
or replace defective parts thereof.
If, upon examination, it is determined that a malfunction has been caused by misuse of the equipment, installation or
operation not in accordance with factory instructions, accident or negligent damage alterations of any manner, and
repair by other than the factory, the repairs will be billed at costs. In such cases, an estimate will be submitted for
approval before repair is initiated. In most cases, Val avionics, Ltd. will provide 48-hour turn around on its warranty
and repair service. We recommend that contact be made with the FACTORY CUSOMER SERVICE
DEPARTMENT prior to any unit return and obtain RETURN AUTHORIZATION AND INSTRUCTIONS. This
will provide proper control and expedite service.
Val Avionics, Ltd. reserves the right of continuous product development without obligation to install changes in
previously manufactured products.
Installation of Val Avionics, Ltd. products must conform to methods acceptable by the Federal Aviation
Administration as described in the appropriate Federal Aviation Regulations (FAR’s) and Advisory Circulars (AC’s).
To ensure proper warranty registration, type or print clearly the application information on the enclosed
PRODUCTS WARRANTY REGISTRATION FORM and return to Val Avionics, Ltd.
If shipping by UPS or FedEx: If shipping by US Mail
Val Avionics, Ltd. Val Avionics, Ltd.
3280 2 TH S SE P O B 1302

VAL AVIONICS, LIMITED
COM 76O TSO VHF TRANSCEIVER
INSTALLATION/OWNER’S MANUAL PAGE i
VPN 701002
REVISION 6 – AUG 1999
TABLE OF CONTENTS
TABLE OF CONTENTSTABLE OF CONTENTS
TABLE OF CONTENTS
List of Illustration___________________________________________________________________ 1
REVISION INSTRUCTIONS AND HISTORY ___________________________________________ 2
SECTION I – GENERAL INFORMATION _____________________________________________ 3
1.1 INTRODUCTION __________________________________________________________________ 3
1.2 DESCRIPTION OF EQUIPMENT ____________________________________________________ 3
1.3 TECHNICAL SPECIFICATIONS_____________________________________________________ 4
1.3.1 ELECTRICAL __________________________________________________________________________ 4
1.3.2 PHYSICAL_____________________________________________________________________________ 4
1.3.3 TSO COMPLIANCE _____________________________________________________________________ 4
1.3.4 TRANSMITTER ________________________________________________________________________ 4
1.3.5 RECEIVER_____________________________________________________________________________ 4
1.4 UNITS AND ACCESSORIES SUPPLIED ______________________________________________ 5
1.5 ACCESSORIES REQUIRED (NOT SUPPLIED) ________________________________________ 5
1.6 LICENSE REQUIREMENTS_________________________________________________________ 6
SECTION II – INSTALLATION ______________________________________________________ 7
…. INSTALLATION ILLUSTRATIONS _________________________________________________________ 7
FIGURE 1-1 BASIC INTERCONNECT DIAGRAM - GENERAL _______________________________________ 8
FIGURE 1-2 INTERCONNECT DIAGRAM WITH OPTIONAL ICM 801009 ______________________________ 9
FIGURE 1-3 INTERCONNECT DIAGRAM WITHOPTIONAL ICM 801010 _____________________________ 10
FIGURE 1-4 INTERCOM MODULE _____________________________________________________________ 11
FIGURE 1-5 VC 760 VOLTAGE CONVERTER ____________________________________________________ 12
FIGURE 1-6 INSTALLATION ASSEMBLY _______________________________________________________ 13
FIGURE 1-7 CRIMPING AND EJECTOR TOOLS___________________________________________________ 14
FIGURE 1-8 COAXIAL CABLE ASSEMBLY ______________________________________________________ 15
FIGURE 1-9 COM 76O OUTLINE AND MOUNTING DIMENSIONS __________________________________ 16
2.1 INSTALLATION – GENERAL INFORMATION_______________________________________ 17
2.2 UNPACKING AND INSPECTING EQUIPMENT ______________________________________ 17
2.3 INSTALLATION __________________________________________________________________ 17
2.3.1 Location ______________________________________________________________________________ 17
2.3.3 Fabricating the Harness Assembly __________________________________________________________ 18
2.3.4 COM 760 TSO Installation________________________________________________________________ 20
2.3.5 Post Installation Check ___________________________________________________________________ 21
SECTION III – OPERATION AND THEORY OF OPERATION ___________________________ 22
3.1 OPERATING INSTRUCTIONS _____________________________________________________ 22

VAL AVIONICS, LIMITED
COM 76O TSO VHF TRANSCEIVER
INSTALLATION/OWNER’S MANUAL PAGE 1
VPN 701002
REVISION 6 – AUG 1999
List of Illustration
Figure
1-1 COM 760 TSO INTERCONNECT DIAGRAM – GENERAL
1-2 COM 760 TSO INTERCONNECT DIAGRAM WITH OPTIONAL INTERCOM MODULE (ICM 801009)
1-3 COM 760 TSO INTERCONNECT DIAGRAM WITH OPTIONAL INTERCOM MODULE (ICM 801010)
1-4 INTERCOM MODULE WITH P801 PIN OUT CONFIGURATION
1-5 VC 760 VOLTAGE CONVERTER (27.5 VDC TO 13.75 VDC)
1-6 COM 760 INSTALLATION ASSEMBLY
1-7 CRIMPING AND EJECTOR TOOLS
1-8 COAXIAL CABLE ASSEMBLY
1-9 COM 760 TSO OUTLINE AND MOUNTING DIMENSIONS

VAL AVIONICS, LIMITED
COM 76O TSO VHF TRANSCEIVER
INSTALLATION/OWNER’S MANUAL PAGE 2
VPN 701002
REVISION 6-AUG 1999
REVISION INSTRUCTIONS AND HISTORY
Where R & R appears in the action column, remove the page now in the Maintenance Manual and replace it with the enclosed page; otherwise, Add or
Destroy pages as listed. Retain these instruction in the front of the Maintenance Manual as a Record of Revisions.
Beginning with Installation/Owner’s Manual Revision 5 May 1996
REV REV PAGE PARA FIGURE
NO. DATE NO. NO. NO. ACTION
6 Aug 99 I REPRINT MANUAL TO REMOVE REFERENCES TO THE VMT 100 MEMORY
TIMER
1 1-10 REPRINT MANUAL TO REMOVE REFERENCES TO THE VMT 100 MEMORY
TIMER
3 1.2 REPRINT MANUAL TO REMOVE REFERENCE TO THE VMT 100 MEMORY
TIMER
5 1.5.5 REPRINT MANUAL TO REMOVE REFERENCES TO THE VMT 100 MEMORY
TIMER
17 1-10 REMOVE
20 2.3.3 C,D REPRINT MANUAL TO REMOVE REFERENCE TO RG 58 A/U SPECIFIC CABLE
20 2.3.3 E REPRINT MANUAL TO REMOVE REFERENCES TO THE VMT 100 MEMORY
TIMER
23 3.1 REPRINT MANUAL TO REMOVE REFERENCES TO THE VMT 100 MEMORY TIMER

VAL AVIONICS, LIMITED
COM 76O TSO VHF TRANSCEIVER
INSTALLATION/OWNER’S MANUAL PAGE 3
VPN 701002
REVISION 6-AUG 1999
SECTION I – GENERAL INFORMATION
PARAGRAPH
1.1 INTRODUCTION
This manual provides information relative to the physical, mechanical and electrical characteristics of the COM 760 TSO VHF
Communications Transceiver. Follow the procedures outlined in the manual for successful installation and designed performance.
1.2 DESCRIPTION OF EQUIPMENT
The COM 760 TSO VHF Transceiver is a quality-manufactured panel mounted 760 channel digitally synthesized communications
transceiver covering the aviation communication frequencies from 118.000 to 136.975 MHz.
The COM 760 TSO design features large LED displays that are clear and easy to read from any viewing angle, and in all alight conditions.
Our exclusive AUTO-TOGGLE frequency selection provides easy access to the desired frequency, The A/B channel selector allows dual
channel “flip-flop” access at all times.
Rugged aluminum construction and design features of the COM 760 TSO will provide many years of dependable service.
With this combination of designed features the VAL AVIONICS, LTD. COM 760 TSO is unequaled in value and performance.

VAL AVIONICS, LIMITED
COM 76O TSO VHF TRANSCEIVER
INSTALLATION/OWNER’S MANUAL PAGE 4
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REVISION 6-AUG 1999
PARAGRAPH
1.3 TECHNICAL SPECIFICATIONS
1.3.1 ELECTRICAL
Voltage ------------------ 13.75 VDC
Current ------------------ 1.0 Amp Receive
4.0 Amp Transmit
1.3.2 PHYSICAL
Height ------------------ 1.4 inches ( 3.56 cm)
Width ------------------ 6.25 inches (15.88 cm)
Depth ------------------ 12.5 inches (31.75 cm)
Weight ------------------ 3.0 pounds ( 1.36kg)
1.3.3 TSO COMPLIANCE
Transmit ------------------ C37c (DO-186, Class 4)
Receive ------------------ C38c (DO0186, Class C)
Environmental ----------- RTCA DO-160B
Altitude and Temperature A1B1
Humidity ------------------ Category A
Vibration ------------------Category PKS
Temperature Range ------ -20 to +55 Degrees C
Short Time Operation --- +70 Degrees C
1.3.4 TRANSMITTER
Frequency Range--------- 118.000 to 136.975 MHz
Channel Spacing --------- 25 kHz
Power Output ------------- 8 watts nominal (50 Ohm Load)
Frequency Stability ------ ±.002%
Duty Cycle ---------------- 25%
Microphone --------------- Transistorized Dynamic or Electret
Sidetone ------------------- Adjustable up to 50 mw into 600 ohm load.
1.3.5 RECEIVER
Frequency Range -------- 118.000 to 136.975 MHz
Channel Spacing-------- 25 kHz
Sensitivity ---------------- 2uv will provide a 6db minimum Signal plus Noise-to-Noise
Ratio.
Selectivity ---------------- Greater than 60db
AGC Characteristics ---- From 10 UV to 200 MV the audio level will not vary more
Than 3db.
Squelch ------------------- Automatic Squelch with manual disable.
Audio Output ------------ 3 watts (minimum) 4 Ohm load 50 mw (minimum) 600 Ohm
Load.
Intercom------------------- Intercom capability, with optional intercom module. (Refer to appropriate installation diagram.)

VAL AVIONICS, LIMITED
COM 76O TSO VHF TRANSCEIVER
INSTALLATION/OWNER’S MANUAL PAGE 5
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REVISION 6-AUG 1999
PARAGRAPH
1.4 UNITS AND ACCESSORIES SUPPLIED
1.4.1 COM 760 TSO VHF Transceiver with mounting tray (VPN 801000-C)
1.4.2 COM 760 TSO Installation Kit (VPN 651000)
PART # DESCRIPTION QUANITY
501007 Speednut 6-32 4
501017 Wave washer 1
501018 Retaining Ring 1
501034* Screw 4-40 X ¼ 2
501055 Flat Washer 1
501053 Screw 6-32 x ½ 4
501067 Screw 6-32 x 3/8 3
550022 BNC Connector 1
550028 Terminal Pin 20
550029* Connector 18 Pin Molex (P101) 1
550030 Connector Right Angle BNC (P301) 1
610000 Cable Tie 2
610004 Locking Screw Hole Plug 1
610006 Cable Clamp 1
701002 Installation/Operator’s Manual 1
*Items on mounting tray assembly when shipped.
1.5 ACCESSORIES REQUIRED (NOT SUPPLIED)
1.5.1 VHF Communications Antenna
1.5.2 Headphones and Speaker.
1.5.3 Voltage Converter, 27.5 VDC to 13.75 VDC, VC760 (VPN 801002).
Required for 27.5 VDC operation only.
1.5.4 Microphone.
Standard aircraft quality microphone. (Mic gain has been preset at the factory with an
Electret microphone for optimum performance).
.

VAL AVIONICS, LIMITED
COM 76O TSO VHF TRANSCEIVER
INSTALLATION/OWNER’S MANUAL PAGE 6
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REVISION 6-AUG 1999
PARAGRAPH
1.6 LICENSE REQUIREMENTS
The installation of the COM 760 TSO Communications Transceiver in an aircraft requires an Aircraft Radio Station License.
Forms (FCC 404, New Aircraft Station License or FCC Form 405A, Renewal of Aircraft Station License) can be obtained from your nearest
FCC Field Office.
.
CAUTION
THE VHF TRANSMITTER IN THE EQUIPMENT IS GRARANTEED TO MEET FEDERAL
COMMUNICATIONS COMMISSION ACCEPTANCE OVER THE OPERATING TEMPERATUR RANGE
ONLY WHEN A VAL AVIONICS, LTD. CRYSTAL IS USED IN THE VOLTAGE CONTROLLED

VAL AVIONICS, LIMITED
COM 76O TSO VHF TRANSCEIVER
INSTALLATION/OWNER’S MANUAL PAGE 7
VPN 701002
REVISION 6-AUG 1999
SECTION II – INSTALLATION
PARAGRAPH
…. INSTALLATION ILLUSTRATIONS

VAL AVIONICS, LIMITED
COM 76O TSO VHF TRANSCEIVER
INSTALLATION/OWNER’S MANUAL PAGE 8
VPN 701002
REVISION 6-AUG 1999
FIGURE 1-1 BASIC INTERCONNECT DIAGRAM - GENERAL
Disregard Line 5 Beginning with Revision 6. VMT instructions no longer apply.
FIGURE 1-1 BASIC INTERCONNECT DIAGRAM – GENERAL
DRAWING #900070-REV 1
(SERIAL NUMBERS 4726 AND ABOVE)

VAL AVIONICS, LIMITED
COM 76O TSO VHF TRANSCEIVER
INSTALLATION/OWNER’S MANUAL PAGE 9
VPN 701002
REVISION 6-AUG 1999
FIGURE 1-2 INTERCONNECT DIAGRAM WITH OPTIONAL ICM 801009
Disregard Line 9 Beginning with Revision 6. VMT instructions no longer apply
FIGURE 1-2 INTERCONNECT DIAGRAM WITH OPTIONAL INTERCOM MODULE (ICM 801009)
DRAWING #900080-REV 1 (SERIAL NUMBERS 4726 AND ABOVE)

VAL AVIONICS, LIMITED
COM 76O TSO VHF TRANSCEIVER
INSTALLATION/OWNER’S MANUAL PAGE 10
VPN 701002
REVISION 6-AUG 1999
FIGURE 1-3 INTERCONNECT DIAGRAM WITHOPTIONAL ICM 801010
Disregard Line 9 Beginning with Revision 6. VMT instructions no longer apply
0
10)

VAL AVIONICS, LIMITED
COM 76O TSO VHF TRANSCEIVER
INSTALLATION/OWNER’S MANUAL PAGE 11
VPN 701002
REVISION 6-AUG 1999
FIGURE 1-4 INTERCOM MODULE
FIGURE 1-4 INTERCOM MODULE
WITH P801 PIN OUT CONFIGURATION
DRAWING #9000090-REV 1

VAL AVIONICS, LIMITED
COM 76O TSO VHF TRANSCEIVER
INSTALLATION/OWNER’S MANUAL PAGE 12
VPN 701002
REVISION 6-AUG 1999
FIGURE 1-5 VC 760 VOLTAGE CONVERTER
FIGURE 1-5 VC 760 VOLTAGE CONVERTER
(27.5 VDC TO 13.75 VDC)

VAL AVIONICS, LIMITED
COM 76O TSO VHF TRANSCEIVER
INSTALLATION/OWNER’S MANUAL PAGE 13
VPN 701002
REVISION 6-AUG 1999
FIGURE 1-6 INSTALLATION ASSEMBLY
FIGURE 1-6 INSTALLATION ASSEMBLY
DRAWING #900120-REV 1

VAL AVIONICS, LIMITED
COM 76O TSO VHF TRANSCEIVER
INSTALLATION/OWNER’S MANUAL PAGE 14
VPN 701002
REVISION 6-AUG 1999
FIGURE 1-7 CRIMPING AND EJECTOR TOOLS
FIGURE 1-7 CRIMPING AND EJECTOR TOOLS
DRAWING #900130-1

VAL AVIONICS, LIMITED
COM 76O TSO VHF TRANSCEIVER
INSTALLATION/OWNER’S MANUAL PAGE 15
VPN 701002
REVISION 6-AUG 1999
FIGURE 1-8 COAXIAL CABLE ASSEMBLY
FIGURE 1-8 COAXIAL CABLE ASSEMBLY
DRAWING #900140-REV 0

VAL AVIONICS, LIMITED
COM 76O TSO VHF TRANSCEIVER
INSTALLATION/OWNER’S MANUAL PAGE 16
VPN 701002
REVISION 6-AUG 1999
FIGURE 1-9 COM 76O OUTLINE AND MOUNTING DIMENSIONS
FIGURE 1-9 COM 76O OUTLINE AND MOUNTING DIMENSIONS
DRAWING 900150-REV 0

VAL AVIONICS, LIMITED
COM 76O TSO VHF TRANSCEIVER
INSTALLATION/OWNER’S MANUAL PAGE 17
VPN 701002
REVISION 6-AUG 1999
PARAGRAPH
2.1 INSTALLATION – GENERAL INFORMATION
This section provides interconnect diagrams and installation criteria for the COM 76O TSO VHF Communications Transceiver.
By following these instructions, the COM 76O TSO VHF Communications Transceiver will perform as specified and provides excellent
performance to meet its design.
2.2 UNPACKING AND INSPECTING EQUIPMENT
Exercise care when unpacking the equipment. Visually inspect the unit for any evidence of damage incurred during the shipment. It is
advisable to retain the shipping carton and packing material should it b necessary to return the unit.
2.3 INSTALLATION
Details and other considerations for the installation of the COM 76O TSO VHF Communications Transceiver are as follows:
2.3.1 Location
The first consideration after the visual inspection has been made to locate the position on the aircraft panel where the unit and
tray will be mounted. The tray is to be mounted rigidly in the aircraft panel with rear support brackets (fabricated by the
installer) attached from the rear provisioned 6-32 nutserts (one on each side at rear of mounting tray) to airframe.
Once a location has been decided upon , a visual inspection should be made of the area directly behind the panel which will be
occupied by the COM 76O TSO VHF Communications Transceiver mounting tray and harness assembly for obvious
obstructions such as heater ducts, control cables, fuel and oil lines or any other obstruction. Pay particular attention to control
yoke assemblies. They should be physically moved the full limit of their travel and verified that sufficient clearance exists prior to
beginning installation.
2.3.1.1 Cooling Requirements
The COM 76O TSO VHF Communications Transceiver does not required forced air cooling when installed by itself or in a very
loose avionics stack. However, the heat generated from several units tightly stacked one on top of the other could certainly cause
damage. Therefore, forced air stack cooling is recommended in any condition where excessive heat may be present.