Question about Cobra 148 GTL 120-Channels Base CB Radio

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Have not used my cobra for some time ...sine someone need my K40 antennae more than me. Just put it back in service with a new magnet mount 36 inch - can send and receive in USB and LSB ....can here in the AM mode ....but cannot transmit out - very little signal?????

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Center the antenna on the vehicle, then check the SWR on channel 1 and channel 40.
with the switch in CAL position, key radio and use the swr/cal knob to set the meter so the needle is just touching the end of the red area on the right-hand side of the meter.
Once calibrated, unkey and switch the switch to SWR and key up again. The lower the reading, the better. If the SWR is Higher on 40, the antenna needs to be shorter.. if its higher on 1, then the antenna needs to be longer.

if it dont transmit period on AM, then there's an internal glitch :)

Posted on Jan 30, 2010

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148 gtls have a very touchy receive they are naturally a quiet radio on am. It could be noone in the area is that close to hear.

Posted on Dec 08, 2014

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I'm not sure what kind of antenna you have, but a 36" magnet mount is not much. I would suggest using a better quality antenna like a Wilson 1000 or something like that. cheap 36" antennas are not a very good investment.

Thanks,
Dodgem250.com

Posted on Mar 05, 2010

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Magnet mounts do not have a true ground.....try grounding chasis of radio to circuit board ground

Posted on Jan 25, 2010

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My name is John, and I will be assisting you with your issue today.
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Hi, my name is John. Welcome to FixYa. Yes, That is not sufficient enough for your antenna. Need any further information let me know. Thanks for choosing FixYa...John

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I can't get the swr value close to 1 it's over 3 what am i mising


Several things are working against you.
1 Antenna location= Needs to be in CENTER of car or truck, and high. no grounded metal can be next to the element (the hot/positve part of the antenna)

2 the only way to really ground the antenna is by having a flat metal ground plane under the antenna. DC grounding does NOT do this, that is a misunderstanding.

3 make sure you use a tunable antenna. I have found the wilson's to be very easy to tune and performe very well, for a base loaded antenna.

4 in short a wilson or k40 magnet mount placed on the very top of the roof in the center will have a perfect ground plane. Then shorten or lengthen the steel whip to ajust your SWR's. You will get the best results this way. This is the ONLY way to achevie good performace.

5 I will say this the absoulte best antenna is the 102"steel whip, if you got the clearnce and dont mind it hitting tree limbs put it on a big magnet mount with a spring at the base and youll have a perfect antenna. But the wilson is shorter and easier to tune.

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depends on what vehicle its going on. If its a car, you don't need anything crazy, unless you are going to run a linear.

You are fine with a wilson 500/1000 mag mount or a k40 mag mount.

just make sure you tune the antenna for lowest SWR.

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