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Cobra 29 SWR problems

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smoke-stack

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Mar 17, 2017
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Have a Cobra 29 night watch version built in 2005. I just started using it after sitting in garage for last 10 years. Night watch does not work and I installed in a dump truck. I initially hooked up coax to 4 ft fiberglass antenna on a mirror mount stud. SWR was below 1.5 but coax had a short so I replaced it with a 6 foot piece. Put new 4 foot wilson antenna and tried swr. It was crazy high. I pulled mount off and put back on and still over 3. I spent an hour playing with antenna and moving mount to other door. Finally got a good reading. Next morning I turned it on and antenna light came on I checked swr with built in meter in radio it showed under 2.0 shouldn't have kicked light on. By end of day it got worse. Now SWR shows needle swing almost all the way to right side. I haven't been able to test with external meter due to no pigtail coax. Is there anything else in radio can cause high swr reading. I can still get about a 2 mile range
 

TheSpaceMann

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Joined
Apr 3, 2014
Messages
1,316
Have a Cobra 29 night watch version built in 2005. I just started using it after sitting in garage for last 10 years. Night watch does not work and I installed in a dump truck. I initially hooked up coax to 4 ft fiberglass antenna on a mirror mount stud. SWR was below 1.5 but coax had a short so I replaced it with a 6 foot piece. Put new 4 foot wilson antenna and tried swr. It was crazy high. I pulled mount off and put back on and still over 3. I spent an hour playing with antenna and moving mount to other door. Finally got a good reading. Next morning I turned it on and antenna light came on I checked swr with built in meter in radio it showed under 2.0 shouldn't have kicked light on. By end of day it got worse. Now SWR shows needle swing almost all the way to right side. I haven't been able to test with external meter due to no pigtail coax. Is there anything else in radio can cause high swr reading. I can still get about a 2 mile range
Don't transmit with high SWR! It could be a loose connection somewhere, or a problem with coax.
 
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