V A L A V I O N I C S , L I M I T E D
C O M 7 6 O T S O V H F T R A N S C E I V E R
INSTALLATION/OWNER’S MANUAL PAGE
18
VPN 701002
REVISION 6-AUG 1999
PARAGRAPH
2.3.2
Antenna Installation
Antenna selection for the COM 76O TSO VHF Communications Transceiver should be a 50-ohm vertically polarized COM
antenna. Wide band COM antennas provide efficient operation over the VHF communications band. Antenna should be installed
per the manufacturer's recommendations and applicable FAA regulations.
1.
Mount the antenna firmly on a flat metal surface or install a ground plan at least 18 inches square for the other than metal
surfaces.
2.
As the particular aircraft design permits, the antenna should be located well removed from any projections, engines,
propellers and other antenna.
3.
Aircraft of similar design may serve as an aid in determining antenna placement.
2.3.3
Fabricating the Harness Assembly
Determine the cable lengths that will be required for various runs to antenna, cabin speaker, aircraft electrical buss and
microphone/headphone jacks. (Refer to the appropriate installation diagram). Use only aircraft quality stranded wire with at least
600-volt insulation that will not support a flame. Minimum wire size will be 22 AWG unless otherwise specified.
The COM 76O TSO VHF Communications Transceiver uses a special Moles 18 pin connector, P101 (VPN 550029) that mates
directly with the circuit board at the rear of the unit. Waldrom Hand Crimper HT-1921 (VPN 850007) should be used to provide
a superior connection while fabricating cable harness. Cut wires to lengths a previously determined and refer to Figure 1-7.
A.
Fabricate the harness as follows:
1.
Strip wire 5/32” for pin terminals (VPN 550028).
2.
Open tool (engraved side toward you), from the opposite side, place the conductors tab section of the pin
on Anvil B. Close tool slightly (until tabs touch the female jaw.)
3.
Insert stripped conductor until insulation is level with outside of jaw. Crimp is made.
4.
Move leads and pin to Anvil A. Crimp again until jaws are fully closed or sufficient crimp is made.
5.
If necessary, straighten pin while still being held in the jaw.
