 | Home > Maintenance & Modifications > CB Antenna Mount - crap SWR readings |
 
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| CFB Member Since: 13 Sep 2007 Location: Bradford, West Yorkshire Posts: 803  
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Just fitted a body mount CB antenna above and right of the back door on the 110, properly earthed etc but can't get a decent SWR reading for love nor money. Checked with a meter and there is no short on the co-ax or mount so I'm baffled. Not had an issue on Defenders before.
Any ideas? Andy |
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19th Aug 2011 7:36pm |
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| pom Member Since: 01 Jun 2010 Location: Worcester Posts: 1343 |
how you powering the cb, did you run the earth to the battery ?
Pom |
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19th Aug 2011 7:39pm |
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| CFB Member Since: 13 Sep 2007 Location: Bradford, West Yorkshire Posts: 803
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Just from the 12v cig lighter socket Andy
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19th Aug 2011 7:40pm |
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| CFB Member Since: 13 Sep 2007 Location: Bradford, West Yorkshire Posts: 803
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So will going straight to the battery help???? Andy
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19th Aug 2011 7:56pm |
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| Happyoldgit Member Since: 14 Sep 2007 Location: Norfolk Posts: 3471 
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Double check the mount is earthed, the co-ax isn't pinched and that the PL-259 is properly secured / soldered.
PS: Check your patch cable is still ok too. Steve. Owned numerous Land Rover vehicles of all shapes and sizes over the decades. Current Defender: A non tarts hand-bagged Puma 110 XS USW. [Insert something impressive here such as extensive list of previous Land Rovers or examples of your prestigeous and expensive items, trinkets, houses, bikes, vehicles etc] http://forums.lr4x4.com I used to be Miserable ...but now I'm ecstatic. |
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19th Aug 2011 8:03pm |
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| CFB Member Since: 13 Sep 2007 Location: Bradford, West Yorkshire Posts: 803
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Definitely no shorts anywhere, will run rig power direct to battery and see if that improves it. Andy
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19th Aug 2011 8:09pm |
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| Landie Boy Member Since: 14 Jan 2011 Location: Essex Posts: 431 
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Hi, where have u earthed it to? Using a circuit tester, check the connection between the earth position and the battery.
Jack |
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19th Aug 2011 8:53pm |
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| CFB Member Since: 13 Sep 2007 Location: Bradford, West Yorkshire Posts: 803
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Aerial mount is earthed to the body and is a good strong earth, rig is on a 12v plug to cig lighter dash socket. Andy
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19th Aug 2011 9:06pm |
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| Landie Boy Member Since: 14 Jan 2011 Location: Essex Posts: 431
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hmmm, the aluminium body does not always give a strong earth...
Jack |
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19th Aug 2011 10:54pm |
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| RobKeay Member Since: 19 Jul 2009 Location: Stafford Posts: 1579
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I did two things brought a better aerial and earthed the bracket to the battery. Now I can get 6 miles coverage.
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20th Aug 2011 12:06am |
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| Glynparry25 Member Since: 16 Feb 2009 Location: Miserable Midlands Posts: 3015  
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Question... Is it a tuned antenna? If not you will need to do that too.
Glyn   |
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20th Aug 2011 7:10am |
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| Happyoldgit Member Since: 14 Sep 2007 Location: Norfolk Posts: 3471
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All this reminds me of when I was installing CB's for people back in the early 80's
 Steve.
Owned numerous Land Rover vehicles of all shapes and sizes over the decades. Current Defender: A non tarts hand-bagged Puma 110 XS USW. [Insert something impressive here such as extensive list of previous Land Rovers or examples of your prestigeous and expensive items, trinkets, houses, bikes, vehicles etc] http://forums.lr4x4.com I used to be Miserable ...but now I'm ecstatic. |
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20th Aug 2011 10:06am |
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| Merlin Member Since: 30 Oct 2010 Location: Newmarket Posts: 981
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Can you use a CB aerial, successfully, as a radio aerial?
Merlin |
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20th Aug 2011 3:26pm |
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| Happyoldgit Member Since: 14 Sep 2007 Location: Norfolk Posts: 3471
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Probably better than using an old coat hanger  Steve.
Owned numerous Land Rover vehicles of all shapes and sizes over the decades. Current Defender: A non tarts hand-bagged Puma 110 XS USW. [Insert something impressive here such as extensive list of previous Land Rovers or examples of your prestigeous and expensive items, trinkets, houses, bikes, vehicles etc] http://forums.lr4x4.com I used to be Miserable ...but now I'm ecstatic. |
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20th Aug 2011 3:34pm |
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| CFB Member Since: 13 Sep 2007 Location: Bradford, West Yorkshire Posts: 803
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Sorted, thanks for the tips.
Ran an earth from the aerial mount direct to the battery and connected the rig direct to battery too, SWR reading now around 2 which is not perfect but much better. Andy |
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20th Aug 2011 4:11pm |
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