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Old 04-29-2013, 02:42 PM   #15
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[QUOTE=Robert L;1483693]
I found that when we did hear something, the operators have their mic gain cranked up to create an echo and distort the voice so much it was annoying at best.. [QUOTE]

I totally agree with Robert... I installed a similar Cobra radio and antenna in my old rig last year. When I traded it in, I left the CB in it... Most truckers that are still into CB have high power linears (amplifiers) and echo mics that are counter effective to the average ear... If you really want to install a CB, I would go with the NGP 4 ft side wall mount firestick. I put mine on the driver side just before the roof. I ran the coax up between the windshield and the window. Easy install. With a stock set up, I got out about 10 miles from my house, and more than enough for the road...
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Old 05-01-2013, 04:42 PM   #16
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Aluminum Roof Excellent Ground Plane

Good news. I found the antenna cable that was provided with my 2005 Endeavor. It was just above the left foot under the dash. I connected my new Cobra 29 Chrome and the SWR was extremely low. After a small adjustment on the radio the SWR was almost zero. Apparently the aluminum roof provides an excellent ground plane. Transmission and reception is excellent although I don't have a good idea what the range is at this point.
I do have one question for the experts: I would like to extend the antenna cable another 3' or 6'. Is there any potential problem doing this?
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Old 05-01-2013, 04:56 PM   #17
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I am CB Illiterate so bear with me.

I installed a Cobra 75W Hand Held back into my rig because there was one there before so the install was easy. (Previous owner took the Mike and left everything else)
However, as all male species know, we need more power so looking at threads on this forum, I replaced the original antenna with a 4' Firefox. Now, I guess I need to tune the radio to the new antenna.
Where does one find an SWR Meter? I don't want to buy one for a one time thing.
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Old 05-01-2013, 05:18 PM   #18
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The Cobra 29 comes with a built in SWR meter and an adjustment to fine tune it. I am not familiar with the 75W but if it doesn't a built in meter perhaps you can borrow one or have a radio shop check it for you.
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Old 05-01-2013, 05:35 PM   #19
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Originally Posted by Ray,IN View Post
Seems I remember a thread (in the CB/ham radio section) where it is possible to mount your CB antenna [I]inside the coach[I] without any harm to occupants, the antenna or radio. Does anyone else remember that?
Can you do it? Yes. SHOULD you do it? No. There is a danger of what's called an "RF burn" should anyone touch the antenna while transmitting, as well as RF radiation being sent through the coach. And, the ability of the antenna to transmit/receive will be diminished.

Place it outside and be safe. I've been licensed for 52 years by the FCC as an amateur radio license. I'd never do that...
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Old 05-01-2013, 09:05 PM   #20
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Quote:
Originally Posted by Willie300s View Post
Good news. I found the antenna cable that was provided with my 2005 Endeavor. It was just above the left foot under the dash. I connected my new Cobra 29 Chrome and the SWR was extremely low. After a small adjustment on the radio the SWR was almost zero. Apparently the aluminum roof provides an excellent ground plane. Transmission and reception is excellent although I don't have a good idea what the range is at this point.
I do have one question for the experts: I would like to extend the antenna cable another 3' or 6'. Is there any potential problem doing this?
This reply does not mean I consider myself an expert. The SWR reading you get on a radio/antenna marriage includes the length of the coax connecting the two. You can certainly try it and see but I would guess that would have negative results with your SWR reading. But it would not hurt to try.

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Old 05-02-2013, 06:17 AM   #21
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If I can find or make an extension cable I'll try it and let you know if it agffects my excellent SWR.
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Old 05-02-2013, 08:42 AM   #22
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Originally Posted by Willie300s View Post
Good news. I found the antenna cable that was provided with my 2005 Endeavor. It was just above the left foot under the dash. I connected my new Cobra 29 Chrome and the SWR was extremely low. After a small adjustment on the radio the SWR was almost zero. Apparently the aluminum roof provides an excellent ground plane. Transmission and reception is excellent although I don't have a good idea what the range is at this point.
I do have one question for the experts: I would like to extend the antenna cable another 3' or 6'. Is there any potential problem doing this?
Adding an additional length of coaxial cable will not impact your SWR in any significant manner. For example, my amateur radio antennas are on a tower that requires 250 feet of coaxial cable to reach them. Go for it.
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Old 05-02-2013, 09:10 AM   #23
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Is a top loaded antenna the same as a top mounted antenna?
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Old 05-02-2013, 09:30 AM   #24
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Is a top loaded antenna the same as a top mounted antenna?
Not necessarily - a top loaded antenna places the RF at the top of the antenna - and a top mounted antenna is one that is mounted on top of something, although it may be a "slang" term for a top loaded antenna. Typically, you'll see mention of base loaded, center loaded, and top loaded antennas for mobile CB use. Here's a discussion on the CB antenna types:

Choosing the Best CB Antenna | Right Channel Radios

As a long-term licensed amateur radio guy, I'd suggest not worrying about an SWR that is lower than 2:1. The operational difference will be minimal, although lower is better. Hope that helps.
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Old 05-02-2013, 10:24 AM   #25
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You are better off than many of us with non-metallic roof material. The aluminum roof will make a great ground plane, you're lucky....

Assuming that the installed antenna uses the metal roof as a ground plane, do as mentioned and check the SWR. If there is a "match" (low SWR), you're in good shape. If not then you will have to develop a plan B.

The Ham Radio section of IRV2 will be a good source of help.
CB & Ham Radio - iRV2 Forums

(Wow, when I began answering this post I was the second responder... once I posted it I see that I am no. 25... )
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