Navistar Electrical Systems CV
Integration Guide
Page 59 of 84
Revision Date: 9/12/2019
metal frame section and bonding the antenna mount to the frame with a
short metal strap will provide the ground plane connection. Some antenna
manufacturers offer
“ground plane kits” that consist of self
-adhesive metal
foil that may be attached to the body panel to provide the ground plane for
the antenna.
Some vehicles use glass that contains a thin metallic layer for defrosting
or to control solar gain. Glass mount antennas will NOT function when
mounted on this type of glass.
If RF-related interactions occur when using a hitch or bumper-mount HF
antenna on a vehicle that has body on frame construction (i.e. pickup,
SUV) connect a ground strap from the vehicle frame to the bottom rear of
the vehicle body (for station wagon type vehicles), or from the vehicle
frame to the bottom rear of the cab (pickup style vehicles).
8.3. Antenna Cable Routing
Always use a high-quality coax (at least 95% shield coverage) located
away from the engine control module (ECM) and other electronic modules.
Care should be taken to maintain as great a distance as possible between
any vehicle wiring and the feed line.
8.4. Antenna Tuning
It is important that the antenna be tuned properly and reflected power be kept to less
than 10% (VSWR less than 2:1).
