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Cobra 25 LTD - building causing a shadow area

We have just bought a Cobra 25 LTD for our guard shack at work to replace a base-station (can't remember the name of the base) it seems to work fine except when our truckers go behind the building to our loading docks they can't hear us we can barely hear them. It is connected to a huge antenna(approx 10-15ft tall). above the guard shack The specs on the Cobra says it's 4W is that enough power for the huge antenna ??

I'm thinking that we should have purchased another base station, or a booster for the CB, either way it looks like we purchased a cheaper solution that works 50% of the time. (Wasn't my decision but I get tasked to 'make it right')

We put in a wireless alarm beacon about a year ago that is UHF I think it was 900MHZ, with a small antenna it is 2W transmit power, it worked through one half of the building but had to have a repeater in the middle to get to the other side.

Another piece of the puzzle, the guard claimed that if the truckers keyed up while right near the guard shack it would pop the fuse on the Cobra ?? That's something the old base station didn't do.

I don't have a peak meter to see if we're getting the full 4W, any help you guys can give will be greatly appreciated. I haven't fooled around with CB in years, I think I had a Cobra several years ago and it seemed like it would transmit for MILES no problem, the building does pose a lot of EMF and noise, not to mention the concrete and steel so it doesn't really suprise if 4W isn't enough.

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One thing to remember is any structure can block or reduce signal strength and reception. If you had reception before and now you don't or it is greatly diminished, start with the basics. Check antenna and the antenna wire (coaxial) for damage and be sure the connectors are still good. Check the SWR's, and finally you may want to have the new radio peaked N tuned. This will increase the receivers sensitivity and boost the output a little more. The radio out of the box is not adjusted to peak performance. After you've done these things and you still cannot be heard on the far side of the building, check the area around the antenna for anything that may be blocking or deflecting your signal. (flag poles, phone lines, etc). And finally, go on the other side and see if there are new structures or maybe the company installed a new alarms system which sometimes can dampen RF signals. I hope this helps!

Posted on Mar 27, 2013

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The older base station was probably peaked and tuned by a CB shop, basically giving it a lot more power. Stock radios very rarely have a full 4watts of power, to tell you the truth. Mine now does 5 1/2 watts and swings to around 20 when I talk. Might be a good investment. Oh, the antenna can't be too big for any wattage. Might want to recheck the antenna's tuning, though...

The truckers wont pop the fuse at all, but I might recommend backing your RF gain down some when they are that close so they dont burn up your receive.

Posted on Jan 15, 2009


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