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CB ANTENNA THAT SNAPS ONTO AN AM/FM AUTOMOTIVE ANTENNA

IP.com Disclosure Number: IPCOM000005492D
Original Publication Date: 1983-Mar-01
Included in the Prior Art Database: 2001-Oct-09
Document File: 1 page(s) / 45K

Publishing Venue

Motorola

Related People

Stanley Wrzesinski: AUTHOR

Abstract

An antenna assembly snaps onto the top of a conventional automotive antenna whip to provide CB transmission and reception as well as AM/FM reception. This avoids the expense and installation dif- ficulties of providing a separate CB radio antenna.

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Volume 3 March 1983

CB ANTENNA THAT SNAPS ONTO

AN AM/FM AUTOMOTIVE ANTENNA

By Stanley Wtzesinski

   An antenna assembly snaps onto the top of a conventional automotive antenna whip to provide CB transmission and reception as well as AM/FM reception. This avoids the expense and installation dif- ficulties of providing a separate CB radio antenna.

   The antenna assembly includes a loading coil and a lop rod or whip of about 3.3. inches, which may be adjustable in length to provide optimum C8 transmission and reception. The loading coil loads the top rod with an inductive reactance equal in magnitude to the capacitive reactance of the rod. The loading coil should have self-resonance at 98 mHz and maximum Q at 27 mHz and 1 mHz. The antenna system continues to use the standard automotive antenna of about 31 112 inches in length, and its coaxial antenna lead as originally installed on the automobile.

   The coaxial antenna lead is now inserted as the input to a splitter box instead of to the AM/FM radio. A parallel inductive and capacitive circuit in the splitter box is designed to resonate at about 27.2 mHz to block the CB signal, but to pass signals in the AM and FM bands to the AM/FM radio. Similarly, another filter circuit filters frequencies in the AM and FM bands, but passes signals within the CB band to the CB transceiver.

SNAP-ON CB ANTENNA AND LDADING COIL

C' ' Motorola. Inc. 1983 40

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