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skyrider
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coax length Empty
PostSubject: coax length   coax length Icon_minitimeWed Nov 16, 2022 8:01 pm

what is the minium length of coax advisable to use between the rig and the ant ?

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SangueG
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coax length Empty
PostSubject: Re: coax length   coax length Icon_minitimeWed Nov 16, 2022 8:43 pm

There isn't one. The shorter the better.. unless you are using stubby antenna like a Super Lance which needs set lengths of coax to work properly.

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https://station-master.online/M7TDV
skyrider
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PostSubject: Re: coax length   coax length Icon_minitimeWed Nov 16, 2022 8:48 pm

no im using a silver rod and 7m of rg58 coax
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PostSubject: Re: coax length   coax length Icon_minitimeThu Nov 17, 2022 5:48 am

As said no minimum length but do leave a bit of slack at the antenna end you don't want it pulling on the pl plug.
Only a a bit that is.

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Victor
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PostSubject: Re: coax length   coax length Icon_minitimeThu Nov 17, 2022 10:21 am

Thank God no one has given you the 'pseudo-science' answer Lionel. coax length 1f44d

.......yet. Wink
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skyrider
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PostSubject: Re: coax length   coax length Icon_minitimeThu Nov 17, 2022 6:46 pm

sounds interesting Victor tell me more  Shocked
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skyrider
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PostSubject: Re: coax length   coax length Icon_minitimeThu Nov 17, 2022 7:07 pm

well i received my coax back from rocket radio yesterday and wired it up but the bad news is i still have high swr and as i have been working today im going to loosen the bottom jubilee clip on the rod and try dropping it a bit and see what happens tomorrow
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PostSubject: Re: coax length   coax length Icon_minitimeSat Nov 19, 2022 3:54 pm

skyrider wrote:
what is the minium length of coax advisable to use between the rig and the ant ?

The distance needed to get from radio to antenna by the path you want it to take. There is no such thing as it needing to be certain lengths except with certain antennas that rely on using your coax as part of the antenna to work which is generally not a good thing.

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skyrider
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PostSubject: Re: coax length   coax length Icon_minitimeSat Nov 19, 2022 5:58 pm

im on a silver rod so i should be ok  Question
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PostSubject: Re: coax length   coax length Icon_minitimeSat Nov 19, 2022 6:53 pm

skyrider wrote:
well i received my coax back from rocket radio yesterday and wired it up but the bad news is i still have high swr and as i have been working today im going to loosen the bottom jubilee clip on the rod and try dropping it a bit and see what happens tomorrow

So when you say SWR is still high what are your readings ? does it become ok anywhere on the frequency you can transmit on ? Have you checked your coax for any shorts ? 

Craig CT Admin

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skyrider
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PostSubject: Re: coax length   coax length Icon_minitimeSat Nov 19, 2022 7:04 pm

it is over3 on channel one , twenty and forty . and what im wondering as you know i have my ant in a large holly bush yesterday i chopped all close by branches so nothing is touching the ant apart from when i fixed the ant in the bush half way up i wrapped a cable tie round the ant and the top of the bush do you think that could be the problem plus there is no 2" fixing pole at the bottom of the ant

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skyrider
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PostSubject: Re: coax length   coax length Icon_minitimeSat Nov 19, 2022 7:08 pm

no i haven't checked for shorts , how would i  do that thanks
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PostSubject: Re: coax length   coax length Icon_minitimeSat Nov 19, 2022 7:23 pm

Some info can be found here 


https://www.wearecb.com/testing-cb-antenna-coax.html



Craig

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skyrider
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PostSubject: Re: coax length   coax length Icon_minitimeSat Nov 19, 2022 7:28 pm

thanks Craig

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skyrider
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PostSubject: Re: coax length   coax length Icon_minitimeSat Nov 19, 2022 7:32 pm

just one point when the coax  went back to rocket radio last week for a new plug do you think they would have tested it at the time thanks
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PostSubject: Re: coax length   coax length Icon_minitimeSat Nov 19, 2022 10:26 pm

Have you checked it for water?
Ideally you dont want any part of the aerial touching anything only the base to the mounting pole/mast etc 
Try taking it out of the tree and mount it on a small pole banged into the garden if still over 3 on those channels somethings wrong
Even a bad swr will change reading as you move throigh the channels where as a short wont
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skyrider
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Call Sign : 26-CT-4654
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PostSubject: Re: coax length   coax length Icon_minitimeSun Nov 20, 2022 11:24 am

right i will try that thanks i will start with loosing the cable ties, and water shouldn't problem as it hasn't been up long enough
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