Antenna Installation - Javad HPT404BT Operator's Manual

Configuration

Antenna Installation

Power supply requirements
Warning: Before connecting the external power source and the modem, make sure that the power source matches the
modem's voltage and current requirements.
2.2. Antenna Installation
Warning: To avoid the equipment serious damage, do not switch the modem to transmit mode if RF antenna is not
connected!
Select the type of antenna that best fits your application and the one that offers the highest dB gain. In
addition, setup your system in the highest possible location to minimize obstacles between the
transmitting and receiving systems. Always place the antenna on the highest point available. At a
minimum, set the antenna to at least ten feet above the terrain using an antenna mast.
Some antennas intended to be attached to the pole mount adaptor (p/n 14-578117-01) are designed to be
operated with a ground plane and some without it. Antennas operating without ground plane marked in
our catalogue as NGP, e.g. UHF NGP Antenna 1/2, 2.4 dB gain, NMO:
• p/n 30-587307-01 UHF NGP Antenna 406-430 MHz, 1/2, 2.4 dB, NMO
• p/n 30-587308-01 UHF NGP Antenna 430-450 MHz, 1/2, 2.4 dB, NMO
• p/n 30-587309-01 UHF NGP Antenna 450-470 MHz, 1/2, 2.4 dB, NMO
This antennas are NO GROUND PLANE antennas with gain 2.4 dB and NMO specified connector type
with should match with your antenna adapter (pole mount or magnet mount). Antennas designed to be
operated with ground plane
• p/n 30-587303-01 UHF Antenna 406-430 MHz, 5/8, 5 dB, NMO
• p/n 30-587304-01 UHF Antenna 430-450 MHz, 5/8, 5 dB, NMO
• p/n 30-587305-01 UHF Antenna 450-470 MHz, 5/8, 5 dB, NMO
provide better gain, but to achieve the best performance of your antenna, add a UHF Antenna Ground
Plane Disk (p/n 10-587400-01) to the bottom of the antenna for a ground plane. UHF antenna Ground
Plane disk improves VSWR and as result increase RF power delivered from transmitter to antenna and
system distance range.
To install antenna with ground plane disc (see pictures below):
1. Unscrew the cone-shaped cable part;
2. Place the ground plane disc between cable parts and screw all parts together;
3. Attach cable with ground plane to the UHF antenna;
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