BigJimnyMeet (North) 2024 (12 Jan 2024)
14th July 2024
Parkwood Nr. Leeds
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Tell me about CB's
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- 1066Boy
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1st, Set the meter as i said on channel 20.
2nd, leaving the setting as is, check reflected reading on channel 1 and 40.
You should get 2 different readings if the antenna is out of tune.
If you get the same reading on 1 & 40 after setting the meter on 20, start checking
the coax cable for damage.
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1066Boy wrote: Thats way too high!
1st, Set the meter as i said on channel 20.
2nd, leaving the setting as is, check reflected reading on channel 1 and 40.
You should get 2 different readings if the antenna is out of tune.
If you get the same reading on 1 & 40 after setting the meter on 20, start checking
the coax cable for damage.
I thought it wasn't right. I'll look at the cable tomorrow. Hopefully its not damaged, didn't look it when I ran it through the car.
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- 1066Boy
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- 1066Boy
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- JuanGuillie
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I did had the same issue with my CB and this is what the salesman/technician of my CB did to my installation.
First of all he did loosen up a little bit the screw that is on the bottom on the side of the metal rod from your aerial-foot.
This metal rod you can push completely down into this foot and then you lift it a little bit up but make sure the metal rod can be tightened up with te screw, so the ideal position should be somewhere in the middle of both positions.
The reason for him doing this is "finetuning" in the "reflected" knob position on your SWR meter when you're nearly on the lowest SWR reading.
The first readings were too high so he did cut some little bit off from the aerial, calibrated the SWR-meter again (on forward) and then did the test "on reflected", if these readings are still too high just cut again a minor piece from the aerial, calibrate SWR again (on forward) and do the test again "on reflected"... do this until you have a low reading "on reflected" on your SWR-meter.
Take care : if you see that you are getting lower readings "on reflected" don't cut to much from your aerial or you have to start all over again. Then if you're nearly at the lowest reading you can finetune your aerial by loosen the screw on the bottom and put the aerial a little bit down or up until you have the lowest reading.
The ideal should be that the SWR readings on channel 1 and 40 should be as close as can be but the reading on channel 40 will always be higher.
If you do these tests also make sure that you are not in the near of metal roof's or pillars !
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- 1066Boy
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Worth checking you have not got a duff SWR meter before trimming the antenna.
Sometimes trimming is necessary but very little. As said before, loosen the grub screw at
the bottom of the antenna and try moving the whip up or down a few mm at a time before
cutting. Its a bugger to stick bits back on!
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This is what it would be like:
www.google.co.uk/search?q=suzuki+jimny+s...rc=wfLVMAuf-WXnOM%3A
I have seen them for Land Rover Discoveries too but cannot find any for sale.
They're not too hard to make. I think I've thrown my old one out that I made or I'd post it to you!
The mag mount ought to just work as it comes though. It has a built in ground plane. Perhaps find someone nearby with a cb and just make sure you can hear them within a reasonable distance.
Mine is all tuned in perfectly and I tuned a friend's one in and we set off home in different directions and could hear each other for about 4 miles on and off with tower blocks in the way. I'd not expect that from a mag mount though.
Kirkynut
The underdog often starts the fight, and occasionally the upper dog deserves to win - Edgar Watson Howe.
My Jimny Thread Here: www.bigjimny.com/index.php/forum/8-my-ji...on-continues?start=0
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- 1066Boy
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kirkynut wrote:
Mine is all tuned in perfectly and I tuned a friend's one in and we set off home in different directions and could hear each other for about 4 miles on and off with tower blocks in the way. I'd not expect that from a mag mount though.
Kirkynut
Mag mount works fine. My average range is 5 miles, up to 15 miles if on a high spot.
The antenna tuning and ground plane is the important bit. Center mounted antenna will give best performance
in all directions. Rear mounts work well but the shape of the ground plane will make the signal more powerful
forward and weaker behind you.
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