Question about Uniden Bearcat Pro PC78LTW 40-Channels Base CB Radio

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Matching Antenna, or ??????

I just bought Uniden PC78LTW, also bought a 4' antenna that I mounted to the outside mirror of truck. It worked fine for a few days and now both red lights come on when i key the mic.......Is this an antenna problem or is the mic bad?

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Re: Matching Antenna, or ??????

I have a uniden pc 78 ltw. Peak and tuned. My light would anntena light would flash. I run a francis 5 1/2 foot with 18 ft 3in of pro8 coax. All i had to do was trim my anntena and reset the swr. problem fixed.
there ya go
Texas Mobil 219

Hope to here ya on ship.

Posted on Apr 20, 2008

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Re: Matching Antenna, or ??????

I bought the same radio and had the radio "tuned" at a CB Shop. After that, the antenna light came on whenever I keyed the mic. I then bought a 4' tunable antenna and pulled out the whip on the antenna about an inch. I checked the SWR on the radio meter and got below 2.0 and the antenna light does not go red anymore. I do need to go to a CB Shop and have them properly tune the antenna. I heard that the CB's SWR meter isn't that accurate.

Posted on Apr 11, 2008

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Re: Matching Antenna, or ??????

If the antenna is tunable, you definitely need to start out by having the swr set properly on the antenna. Also, make sure the plastic ferrel, (the small round white piece) is between the top of the antenna bracked and the antenna itself. It is there to make sure the antenna does not ground out to the vehicle. If the antenna is grounding out, it will be like no antenna at all. I have also had a few customers that have had broken coaxes straight out of the factory package on cheaper antenna setups.

Rollin CBs

Posted on Jan 23, 2008

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Re: Matching Antenna, or ??????

I have many many 10-meter radios and modded cb's. I just purchased the PC78LTW brand new in the box with a mag mount antenna on craigslist for 80bucks. I took it out of the sealed box put my SWR meter on it, set the antenna up on my tailgate, just to check if it worked correctly....after calibrating the swr, it put out over 8 miles! Not too bad at all...its going for a cb shop peak and tune, echo, and roger-beep on saturday. Point I'm trying to make is to listen to the others who responded on here...its all about tuning, and getting the radio and antenna in sync. I bought the SWR meter for 17 bucks at my local radio shop in Bow NH. Go online and read articles about tuning and you'll figure it out. I'm just a local cb hobbiest and once you get the steps down you'll be calibrating all of your friends radios because they'll be astonished at how good yours sounds.

Posted on Mar 19, 2009

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Re: Matching Antenna, or ??????

Sounds like you need to go to a cb shop and have the ant matched up to the radio

Posted on May 29, 2007

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I just bought a cobra 29 LTD Chrome along with a 102" whip and spring. Best place to install antenna on semi dump truck? Suggestions? And how critical are your surroundings when tuning the antenna?

what kind of truck? does it have a fiberglass body? If it does then you would have to go directly to the chassis to mount the antenna.If you got a different antenna , like a Wilson 2000 , you could either run it co-phased or single. you would have to get mirror mounts and coax or buy a kit that has it included . Tuning a single antenna is easy but a twin is harder to do. you have to tune each antenna individually. what you also have to do is stay clear of buildings, overhead electrical wires ( high tension ) and metal objects. Now we know this is impossible so just get the SWR down as low as you can and also make sure your doors a both closed when checking the swr.

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I assume your coax is not hooked up properly or you have some kink of a short in your antenna connection ( thats if your cb is working properly ) Radio Shacks Information that suggested that the 102" whip is the perfect antenna is their opion only as I prefer to recommend a full wave antenna system to my customers, but I do assure you, the 102" whip does work well if it's properly installed. I have found the main problem in the 102" whip installation is when the center hole is cut to install the antenna, it's not cut big enough, which grounds the antenna. It's not suppose to be grounded in any fashion to the automible chassis. The ground of this antenna comes from the 3 screws mounted around the outside of the antenna mount. Check that for sure. If you can't correct the problem. write me back at this web sight of direct at Good Luck
NC Electronic
Mills, Wyoming

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