Excalibur CB aerial

Homebase antenna advice and troubleshooting

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robpxr3
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Wed Jun 27, 2012 7:40 pm

Hello all

Don't know if it's been brought up before but i've got one and having problems with high swr, ie in the red.
I've got 10m of coax joined to 2.2m of coax with a female adaptor (to make the recommended 40') however still high.

I had it up on the now redundant tv aerial pole and it seems to receive ok but high swr.
What is odd if i take it into the middle of the garden and lay it down the swr goes down to 1.4 !!

If anyone has a logical answer to this headscratcher i'd be greatful!
I know they're not the best for transmitting etc but i cant stick a biggen up there unfortunately so have to make do with that :-(

Dragonfly
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Thu Jun 28, 2012 12:50 am

I think with the Excaliber it can only be tuned by altering the coax length .

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stampman
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Thu Jun 28, 2012 9:37 am

sounds like you are getting reflection from something


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robpxr3
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Thu Jun 28, 2012 11:04 pm

I think you may be right Stampman- perhaps because it's mounted alongide the pole and not on top isnt helping -need to try it on a standalone pole me
thinks.

But, even if i get the SWR sorted im still stuffed with the limited transmission range- so i'm going to try something else.
I have a spare Modulator aerial & mag mount, need to find a makeshift groundplane (no biscuit tins tho lol) and give that a go.
Not many people round my way on CB so local transmission im pretty much talking to myself!

Will let you know how i get on ! Now where's that spare car wheel. . . . .

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stampman
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Fri Jun 29, 2012 9:17 am

like your thinking


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robpxr3
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Fri Jun 29, 2012 8:35 pm

Well i had a root around at work today and i've come up with a steel wheel from a Mondeo and a brake disc off a Galaxy- both big & heavy so if those two together dont make a good groundplane i don't know what will !

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stampman
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Sat Jun 30, 2012 7:46 am

its not the weight but the surface area that matters the more surface area the better


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robpxr3
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Fri Jul 06, 2012 7:23 pm

Yep quite true, but the good news it works! Much better than the Excalibur even with the Modulator II in the loft.
Got the SWR down to 1:6, it was a bit lower out in the garden but obviously there's a bit of reflection off the rafters lol

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stampman
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Sat Jul 07, 2012 10:08 am

and another one bites the dust good result


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wildfire
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Tue May 07, 2013 11:41 am

i personally think any mobile antenna would but the Excaliber to shame lol & with the Excaliber having a 4 miles radias who ever buys one i hope they don`t expect to go breaking records for long distance contacts anyway glad to hear your doing well with your modulator 2 robpxr3 as they are good antennas for centre loaded but i think we all know for a mobile or a home base short antenna you can not go wrong with a center loaded or a top loaded antenna :wink:

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