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Post by hillbilly1987 on Jul 18, 2009 17:01:23 GMT -5
hey guys i am havin problems with my mobile setup and for awile i was using a 102inch with spring and i grounded everything outand i checked the coax and everything is fine but the problem is that i cant seem to get da SWR below 1.6 and i have been havin this problem for about 2 weeks and i cant figure it out and im just thinkin of getin a new whip and the two i am thinkin about are the monkey made long shaft or wilson 1000 trunk mount but dont know yet. what do you guys think?
please help i really want to get back on the air waves
73 asphalt cowboy
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Sandbagger
Administrator/The Boss 
Posts: 6,250 
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Post by Sandbagger on Jul 19, 2009 9:09:56 GMT -5
hey guys i am havin problems with my mobile setup and for awile i was using a 102inch with spring and i grounded everything outand i checked the coax and everything is fine but the problem is that i cant seem to get da SWR below 1.6 and i have been havin this problem for about 2 weeks and i cant figure it out and im just thinkin of getin a new whip and the two i am thinkin about are the monkey made long shaft or wilson 1000 trunk mount but dont know yet. what do you guys think? please help i really want to get back on the air waves 73 asphalt cowboy A 1.6:1 match is not all that bad. It certainly won't stop you from talking. But you did say it used to be better, so that means something changed. So my question to you is, have to changed anything? Like adding an (different?) amp in line. Did you change the length of the jumper to it? If the answer to that is no, then I ask where do you have your antenna mounted? You say it's a 102" whip. They're broad banded and usually fall right in with a better than 1.5:1 match unless there's a grounding issue or the whip is mounted too close to the vehicle's body (Like a bumper mount on a van). Trunk mounting on later model cars can also be problematic. Sometimes the hinges use plastic bushings which can intermittently isolate the trunk lid from the rest of the car's body, reducing your ground plane. In cases like that, you can run grounding straps from the trunk lid to the car body. Don't just shotgun a new antenna. You'll only hide the problem, unless you're going to mount it in a totally different place. A 102" whip is a far superior performer to a shortened antenna like a Wilson. So while you might get a better match, you may not "get out" as well. |
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Post by hillbilly1987 on Jul 19, 2009 19:09:37 GMT -5
well the thing is i did ground the 102" and and i get about a 1.6.1 swr i have the galaxy 959 then a 2 foot jumper going to amp then another 2 foot jumper going to meter then the coax to anntenna witch is a 102 but the thing is i need to get the swr below 1.5.1 becouse i run that amp and i would like to mount it on the trunk but i get 1.6.1 swr there and i will put it on the side of the trunk and i get 1.6.1 at times then at other times i get almost a 2 on swr i dont know what to do please help i have tryed what i could but now i need help and the car i have is a 98 ford tourus thank you for helping me!!!!
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Post by Afterburner(OT-749) on Jul 19, 2009 19:41:13 GMT -5
My recommendation is to get an new vehicle. A 1998 Ford Taurus is known to cause all kind's of SWR problem's!
Naaa... just bustin ur chops that is all. But it is a shame that you have a Ford.
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Post by hillbilly1987 on Jul 20, 2009 1:22:56 GMT -5
ya it sucks i do have a ford i really do want a chevy or dodge pickup but i am saving up for one of thoes. do you know what i can do afterburner? i dont know what to do now i have tryed and tryed but no luck and now i think i have lost so many trys and time that i cant believe how much high speed chicken feed i did to try to fix this i stay up for along time with no sleep day and night and i mean really want to get back on the air waves and talk and i am really get that one big urge like dave talks about in his story and its about flipping that big switch on that amp and keying the mike so i really need your guys help. i dont know if you guys have ever seen this kind of car but its maid out of two body frames and ones fiberglass and the other is metal. so please prity please help.
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Post by wd8nia on Jul 20, 2009 4:52:41 GMT -5
Have you taken the antenna out of system and checked the radio/amp combo with a dummy load; or, tried different length jumpers between the radio and amp. Some manufacturers recommend different length jumpers between the radio and amp. Where's the amp located? Best location is in the trunk near the antenna.
Sometimes the 102" whip can be really nasty to match, depending on vehicle and antenna location, and occasionally unconventional methods must be employed to bring it in. You may spend more than one sleepless night accomplishing it, but it's well worth the effort when you finally do.
Eliminate the obvious causes first. Go back to the beginning and check with a dummy load and different jumper lengths....then I'll see if I can lessen the amount of hair you pull out getting the job done.
Good luck and 73.
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Post by Afterburner(OT-749) on Jul 20, 2009 6:41:05 GMT -5
wd8nia ... you took the words out of my mouth on my suggestion to him. I would ask though, are you testing the radio without the linear in line and what are those SWR's. If the SWR's are good without the linear in line, and when you hook the linear up they go off, I would start by trying different length's of coax between the radio and the linear and then between the linear and the antenna to see if you can get them in an acceptable range. In the end, I would venture to say that something has gone array with the linear and is causing his problems.
Make sure that you have a GOOD, POSITIVE ground on the antenna.
What radio are you using to talk with? what is the output of that radio compared to the maximun drive the linear can handle? Is it a low drive or high drive linear? I am betting that the radio has to much drive into the linear and has done something that is not wanted.
I run a RCI 2950 DX into a TS 500V into a Wilson 5000 on my work van. The antenna is mounted through the roof (not magnet mount) just where the cab and cargo area line would be. I turn the output way down on the radio and talk all over the place with no problems at all. My SWR's have never gone above 1:2-1 across from about 30 channels below and above the "normal " CB freq's.
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Post by hillbilly1987 on Jul 26, 2009 3:48:49 GMT -5
well guys i thank you very very much and i dont know how to thank you but i did get it fixed and now my swr is very low almost flat i had to install my duel whips and i am using a galaxy 959 and super star 200 on a ford toures and its working alot and i mean alot better anyways 73 take care and god bless all
asphalt cowboy
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