User's Manual

a properly installed, externally-mounted antenna. Table ? lists the minimum lateral
distance for the VRS 750:
Rated Power of Vehicle-installed
Mobile Two-way Radio
Minimum Lateral Distance from
Transmitting Antenna
Less than 7 Watts 8 Inches (20 Centimeters)
VRS Antenna Installation
Recommended mobile antenna installations are limited to metal body vehicles at the
center of the roof and center of the trunk deck locations.
Install the antenna to be used with the VRS according to the instructions supplied with it
by the manufacturer (an antenna is not included with the VRS models). Mount the
antenna as far from the mobile radio antenna as possible, but never less than three feet.
An ideal configuration would be a roof-mounted mobile radio antenna and a trunk-
mounted VRS antenna. Connect the antenna cable mini-UHF connector to the antenna
jack on the rear of the VRS unit. A mini-UHF crimp connector is provided with each
VRS750 unit for easier installation with a pre-existing antenna.
VRS750 Programming
The user selectable operating parameters for the VRS750 reside in the ASTRO mobile
EEPROM during normal operation. The EEPROM located in the VRS750 holds the
tuning parameters. The VRS750 programming windows reside in ASTRO Spectra CPS
and are accessible when the “VRS-EP Option” is enabled in CPS under the Radio
Configuration->Radio Wide->Advanced window (see Figure 4).