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| | | | Joined: Oct 2006 Posts: 4,983 Master Gabster | | Master Gabster Joined: Oct 2006 Posts: 4,983 | a 12 volt AM FM radio. In other words is there a just thing as an adapter for the CB plug to the radio? All this to be able to use both radios with only one antenna.
~Jim
| | | | | Joined: Jan 2000 Posts: 591 'Bolter | | 'Bolter Joined: Jan 2000 Posts: 591 | Antennas are sized (loaded) by the wave length they intended to be applied to. A CB radio antenna is optimized for 27 MHZ. AM/FM frequencies are are from about .6 MHZ to 1.6 MHZ. FM is about 88 MHZ to 108 MHZ. As you can see the a CB antenna is not the best choice, but they will work for a AM/FM radio (almost anything will). The three practical issues you will run into are:
1. The antenna connectors for a CB radio are usually much different mechanically than an AM/FM radio.
2. CB radios use a coaxial cable for the antenna connection, AM/FM radios use a lesser quality cable.
3. If you use one antenna for both, when you transmit from the CB, you will "jam" RF energy into the AM/FM radio at about a 5 watt level. This could cause damage to the AM/FM radio.
Items 1 & 2 you can "kluge" something up, but it would be ugly. I don't know if they still make them, but back in the 70's they used to make combined AM/FM/CB radios. You can still find them on eBay. | | | | | Joined: Jun 2006 Posts: 693 'Bolter | | 'Bolter Joined: Jun 2006 Posts: 693 | back in the 70's there were also a variety of antenna combo/adapters too. i recall one that did the opposite of what Jim wants to do, ie it allowed the CB to use the existing AM/FM antenna so an additional antenna did not have to be added to the car. i recall that it didn't work all that well, either... | | | | | Joined: Mar 2011 Posts: 940 'Bolter | | 'Bolter Joined: Mar 2011 Posts: 940 | ...back in the 70's they used to make combined AM/FM/CB radios. You can still find them on eBay. I had one of them in a '76 Stingray. The antenna looked like a mini CB antenna - coil wound at the bottom but smaller and only about 24-30" long. They make amplified hidden antennas for AM/FM. I'm sure they make something for CB too. | | | | | Joined: Oct 2012 Posts: 233 'Bolter | | 'Bolter Joined: Oct 2012 Posts: 233 | the late 80s Honda Goldwing had a cb/radio antenna combination and they are sold on ebay. You would need the whole set up to make it work.
1953 Chevy 3100 261 and SM420 53Chevy 31001953 Mack Firetruck 1972 Porsche 911 1986 Honda Goldwing
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