Installation Mobile 1/4-Wave Antennas Installation 4. Refer to Figure 5. From the top, feed the RG-58A/U lead-in cable between the headlining and the metal roof. Then route the cable between the roof and the radio set. 5. Refer to Figure 6. The bushing assembly is now in a position to drop into the hole in the roof. It should be tilted at a slight angle and fed into the 3/4-inch hold. The threaded top will not fall through the hole. 6. Refer to Figure 7.
Mobile 1/4-Wave Antennas Figure 5. 4 Installation Coaxial Cable Insertion Figure 6. Figure 7. Locking Nut Positioning Figure 8.
Installation Mobile 1/4-Wave Antennas 4. Remove the metal and filler from this 1-1/4-inch diameter hole. 5. Complete the installation per installation procedure given for vehicles with single wall construction. A completed mount is illustrated in Figure 9. 4. Mounting Hardware Installation – Trunk Lip Mount NOTE Not recommended for transmitters with power outputs of 7 W or greater.
Mobile 1/4-Wave Antennas Figure 11. Installation Typical Mount Location NOTE The coaxial cable will normally not be harmed by opening and closing the trunk, although reasonable care should be exercised. The rubber molding around the trunk lid will prevent damage to the cable. 5. Route the cable from the mounting base to the radio set. Rubber grommets should be used in any sheet metal holes through which the cable is routed. Ensure that the cable will not be pinched during normal vehicle operation.
Frequency Conversion Mobile 1/4-Wave Antennas (roof mount models only; see Figure 3) to provide for proper impedance matching. Should it be desired to change from an antenna in the 136-150.8 MHz range to one in the other ranges, this washer must be removed in addition to changing the whip assembly. Conversely, to shift from the other ranges to the 136150.8 MHz range, a spring washer must be installed in addition to changing the whip assembly.
Mobile 1/4-Wave Antennas 2. Motorola Recommendations for Mobile Antenna Location The best mounting location for the antenna is in the center of a large, flat conductive surface. In almost all vehicles, mounting the antenna in the center of the roof will satisfy these requirements. A good alternative location is in the center of the trunk lid. If you use the trunk lid, ensure that the trunk lid is grounded by connecting grounding straps between the trunk lid and the vehicle chassis. 3.