Question about Cobra 25 LTD 40-Channels Base CB Radio

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I have a cobra 25 nw st and i do not have a swr meter. how do i tune it to the antenna. the antenna will be used on several trucks.

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You really should have or borrow a meter for this task. Just tune it for the for the lowest SWR, mounted in the position it will hopefully be mounted on all the trucks. I presume you are a Trucker, and will be placing on another Tractor, with a similar or West Coast mirror style mount. Let us know how this works out on the various vehicles. Thanks, Bill

Posted on Sep 01, 2010

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1 Answer

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first of all you are going about it wrong. To set your SWR you check it on channels 1 , 19 , and 40. If you reading is higher on 1 than on 40 you have to shorten your antenna . if its higher on 40 than on 1 then you have to lengthen it. before you do any adjustments to it ,loosen the set screws and let the antenna fall to the bottom then bring it up 1/4 " and tighten the screws. You should also use an external SWR meter not the one on the radio. Thats good for making checks every once and a while. With the meter you key the mic and have the needle go to set then put it on for and key the mic to obtain you reading . Anything under a two is good .

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1 Answer

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Hello candy_72_99,

Hello candy_72_99,

If I am correct what you are saying is that your radio has poor modulation? ok. First I need you to run two tests for me.

1) Power output Test: connect a power meter to the antenna jack and the other connector of the meter to the antenna, Key up the mic and record the power reading is should be 4W PEP or 36.02dbm

2) Then I want you to take an oscilloscope and put a 1khz tone in to the mic while measuring the RF output at 100% modulation the wave form should not clip.

If these two test are good then your modulation is ok. What I believe you are asking for is more power or better power efficiency.

Try to tune your antenna for 1:1.0 or 1:1.2 SWR with a SWR meter this should deliver the full power to your antenna.

I hope this helps

Thank you,

Shuttle83

Nov 04, 2008 | Cobra 25 LTD 40-Channels Base CB Radio

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