Download  Print this page

Motorola RRA-4935 Instructions Manual

Mobile gain antennas 890-960 mhz
Hide thumbs


Figure 1.
The mobile rooftop antenna is supplied with a coaxial
lead-in cable and a connector. In the completed instal-
lation, the cable is concealed between the headlining
and the roof of the vehicle, with a minimum distur-
bance to the headlining and the upholstery. Figure 11
provides a pictorial drawing of the disassembled
antenna complete with component part numbers.
Figure 1 shows an antenna assembled.
Advise the radio owner to unscrew the
upper antenna assembly at the knurled
section before entering an automatic car
wash to prevent damage to the antenna
or the roof of vehicle. When unscrewing
the antenna, be sure only the upper sec-
tion, not the coupling nut is removed. If
t h e c o u p l i n g n u t s h o u l d l o o s e n ,
retighten it securely against the mount-
ing surface.
and Motorola are registered trademarks of Motorola, Inc.
Copyright © 2000 Motorola, Inc. All Rights Reserved.
Mobile Gain Antennas
Models RRA-4935/RRA-4936
See Table 1 for recommended antenna location for var-
ious vehicles. The installation procedure which follows
is for a typical passenger car. The procedure may vary
slightly with the type of vehicle on which the antenna
is to be installed. Generally speaking, however, the
procedures outlined are of a "universal" nature.
Observe the safety precautions given in
this instruction manual. Never adjust
antenna whip length while the radio is
being keyed.
This antenna is factory tuned for 835 MHz.
The antenna should be mounted on a flat
metal roof of .020 to .040 inch thickness.
First, select a location for the antenna as near the center
of the roof as possible (see Step 1 of the installation pro-
cedure following).
When installing the lead-in cable, the
cable should not be shortened.
The headlining may be probed with the fingers to
make sure that all points of obstruction will be
Drill a pilot hole at selected location then, drill
a 3/4-inch hole from the top (outside the vehi-
cle only) with the Motorola 01-80382A25
holecutting saw (or equivalent) until it bot-
toms. Clean the roof metal in a neat circle to
assure good contact with the mounting base
and its locking nut.
In installations involving a double roof
with no dome light, a second 3/4-inch
hole must be drilled. However, a deep-
well type of 3/4-inch hole saw (with pilot
drill bit) must be used to cut the second
(or bottom) roof section. This provides
access to the area where the coaxial cable
is routed, between the second roof sec-
tion and headlining.
890-960 MHz


Table of Contents

  Related Manuals for Motorola RRA-4935

  Summary of Contents for Motorola RRA-4935

  • Page 1 , is routed, between the second roof sec- retighten it securely against the mount- ing surface. tion and headlining. 68P81124E57-A and Motorola are registered trademarks of Motorola, Inc. Copyright © 2000 Motorola, Inc. All Rights Reserved.
  • Page 2 Mobile Gain Antennas Installation Drill the second 3/4-inch hole if required. Use extreme caution, though, to prevent punctur- ing the head lining. For proper seating of the mounting base and locking nut, remove any burrs and/or foreign matter from above and below the (top) 3/4- inch mounting hole.
  • Page 3 Installation Mobile Gain Antennas Figure 5. Figure 6. Figure 7. Double Roof (with Dome Light) Installation Figure 8. Double Roof (No Dome Light) Installation NOTE Figure 7 shows how the base mount should be installed in a vehicle with dou- ble roof construction and a dome light Figure 8 shows how the base mount should be installed in a vehicle with dou-...
  • Page 4 Mobile Gain Antennas Connector Installation (Mini-UHF) Figure 10. Crimp Tool Figure 11. Model shown is a complete antenna RRA-4935 Connector Installation (Mini-UHF) NOTE R R A - 4 9 3 6 i s a m a g n e t i c m o u n t Use Motorola hand tool part #66-80388A26.
  • Page 5 Mobile Antenna Location the dielectric bottoms inside the body. Refer to Figure 12. Motorola recommends that mobile antennas be located as follows. Refer to Table 1. 4. Crimp the center contact using the proper crimp section of the tool. Refer to Figure 10 Antenna Location marked “CENTER CONTACT”.
  • Page 6 Specialty vehicles (such as T-roofs, sun roofs, or convertibles) Center trunk lid – recommended only for transmitter output of less than 7 W. Other vehicles Contact your Motorola Field Technical Representative. Do not install closer than the distances shown in Table 2, for the rele- vant transmitter output power, from occupants or without proper antenna ground plane.

This manual is also suitable for: