Runboard.com
You're welcome.
Community logo






runboard.com       Sign up (learn about it) | Sign in (lost password?)

Page:  1  2 

 
topbuzzuk Profile
Live feed
Blog
Friends
Miscellaneous info

Big Cheese

Registered: 11-2007
Location: Wiltshire, UK
Posts: 2645
Karma: 12 (+12/-0)
Reply | Quote
Mobile set-up Problems


Risght,,,, ive put my radio in my land rover discovery and i am getting about 3-5 signal points of interferance. i switch the headlights on and this goes up a S point. I am not getting any alternater interferance as when the engine is revved it doesnt go up n down. Ive wired straight to the battery and i'm using a mag mount and the swr hardly moves. I am wondering if its an earthing problem as i had trouble using a gutter mount, i couldnt get swr down on 2 antennas with out having to cut the whips which i shouldnt of had to do(and didnt as 1 was brand new). I know the roof is steel on the disco and the rest of body is alloy, and the headlights effectin the S meter on rig seems makes me think of earth and maybe same with gutter mount??? not sure but its a pain as the interference stays even with ignition off.

im not good at explainin stuff so i hope you understand what i'm saying... lol

---

11/Jan/2008, 11:59 pm Link to this post Send Email to topbuzzuk   Send PM to topbuzzuk Yahoo
 
26fb139 Profile
Live feed
Blog
Friends
Miscellaneous info

DX-pert

Registered: 01-2008
Location: Dudley west mids
Posts: 1275
Karma: 8 (+8/-0)
Reply | Quote
Re: Mobile set-up Problems


yes it's earthing,try earthing off the radio to body.also gutter mounts an'it the best place in the world ,to put a ariel.& yes you will av to trim the whip to swr it to what either freq u r using,normaly 27.500.i would use a mag mount alot better & put a quick release on the base.u could also be picking static off engine them silly little earth strips what hang off the back of cars mite help.

---
139 in any GOOD group??
12/Jan/2008, 9:05 am Link to this post Send Email to 26fb139   Send PM to 26fb139
 
yamanx1 Profile
Live feed
Blog
Friends
Miscellaneous info

Head Honcho

Registered: 09-2007
Location: In a world of my own
Posts: 4849
Karma: 32 (+33/-1)
Reply | Quote
Re: Mobile set-up Problems


You could try and earth the radio chassis as well as the black wire to battery. At the moment its earthing through the coax.

If you're getting niose without even the ignition on then it may be nothing to do with the vehicle at all, it could be something else local? Try driving the car up the road a bit and see whats happening?

Be sure to let us know how you're getting on emoticon

---

By all means think yourself big, but never think others small.... R.F.Scott
12/Jan/2008, 10:52 am Link to this post Send Email to yamanx1   Send PM to yamanx1
 
topbuzzuk Profile
Live feed
Blog
Friends
Miscellaneous info

Big Cheese

Registered: 11-2007
Location: Wiltshire, UK
Posts: 2645
Karma: 12 (+12/-0)
Reply | Quote
Re: Mobile set-up Problems


i'm goin to try a seperate earth to the body as i know they have rubber mounts between this and chassis. I drove the jeep about 8 miles from work to home and the static noise just stayed around3-5 S points even when turning off the engine, the battery is rightbehind a headlight and all i can think of is earth. i will let you both know how i get on today, cheers

Paddy

---

12/Jan/2008, 11:07 am Link to this post Send Email to topbuzzuk   Send PM to topbuzzuk Yahoo
 
topbuzzuk Profile
Live feed
Blog
Friends
Miscellaneous info

Big Cheese

Registered: 11-2007
Location: Wiltshire, UK
Posts: 2645
Karma: 12 (+12/-0)
Reply | Quote
Re: Mobile set-up Problems


well ive tried allsorts today, i got rid of the 3-5 S points by disconecting the battery earth lead(main car one)and just having the cb wired to battery, this is a problem as i cant start the motor emoticon i tried earthing the radio to the body and the antenn to the body, stil no good.

then i checked swr and this was 3, now the sirio megawatt has very good swr, always has on everything i put it on. Now if i held the coax and sqeezed my hand around it and held it close to the gutter the swr went back to normal(hardly moving). well i connected the car earth to the battery as i need to drive it and it started getting dark so i cant do anymore and its starting to stress me out, ive never had problems like this before and can only think its the discovery.

i really dont know what to do next i had less interference going through the fag lighter. It should be better straight to the battery. This is going to be a tuff one to sort out i can se, and theres no point having a decent radio if i cant use it, its looking like i will be going back to the 40 channel muppet box and only using it for offroading, i'm gutted cos i cant get out and use it

---

12/Jan/2008, 4:50 pm Link to this post Send Email to topbuzzuk   Send PM to topbuzzuk Yahoo
 
yamanx1 Profile
Live feed
Blog
Friends
Miscellaneous info

Head Honcho

Registered: 09-2007
Location: In a world of my own
Posts: 4849
Karma: 32 (+33/-1)
Reply | Quote
Re: Mobile set-up Problems


Hi ya Paddy,

Definately grounding problem I reckon. Your gutter mounted just is not producing enough ground plane. Even if you get swr right it could be just a big dummy load with loads of noise.

Has your Landy got an ali roof? If not get a mag mount, the type with S0238, proper job for megawat 4000. Works ten times better than a gutter mount.

Good luck m8 dont give up just yet emoticon

---

By all means think yourself big, but never think others small.... R.F.Scott
12/Jan/2008, 5:24 pm Link to this post Send Email to yamanx1   Send PM to yamanx1
 
topbuzzuk Profile
Live feed
Blog
Friends
Miscellaneous info

Big Cheese

Registered: 11-2007
Location: Wiltshire, UK
Posts: 2645
Karma: 12 (+12/-0)
Reply | Quote
Re: Mobile set-up Problems


hi dave, ive took the gutter mount off and been using the mag mount for a couple of weeks as i couldnt get any sense out of the swr on the gutter. the mag mount has been excellent with the swr needle hardly moving. Ive only been gettin problems with the mag mount and static/interference since i wired straight to the battery. I had interference from the heater fan when using the fag lighter and could get no sense out of the gutter mount, the mag mount swr has always been excellent, until rewiring the cb straight to battery the other day. The roof is steel and the rest of body is alloy, i'm sure this is something to do with it maybe where the roof joins the alloy? i dont know what to do, maybe put another battery under the bonnet on opposite side and run the cb from that with a split charge??

---

12/Jan/2008, 5:44 pm Link to this post Send Email to topbuzzuk   Send PM to topbuzzuk Yahoo
 
yamanx1 Profile
Live feed
Blog
Friends
Miscellaneous info

Head Honcho

Registered: 09-2007
Location: In a world of my own
Posts: 4849
Karma: 32 (+33/-1)
Reply | Quote
Re: Mobile set-up Problems


Hmmm, if you do want to split charge, I can get you a relay etc. Or split charge diode? I can get you a battery as well as I work in the commercial vehicle industry, but the postage would kill it. I can get you some battery cable though, if you need it.

I reckon its something simple, I'll have a think. emoticon

---

By all means think yourself big, but never think others small.... R.F.Scott
12/Jan/2008, 8:58 pm Link to this post Send Email to yamanx1   Send PM to yamanx1
 
yamanx1 Profile
Live feed
Blog
Friends
Miscellaneous info

Head Honcho

Registered: 09-2007
Location: In a world of my own
Posts: 4849
Karma: 32 (+33/-1)
Reply | Quote
Re: Mobile set-up Problems


How did you get on? Sort it?

---

By all means think yourself big, but never think others small.... R.F.Scott
13/Jan/2008, 8:34 pm Link to this post Send Email to yamanx1   Send PM to yamanx1
 
topbuzzuk Profile
Live feed
Blog
Friends
Miscellaneous info

Big Cheese

Registered: 11-2007
Location: Wiltshire, UK
Posts: 2645
Karma: 12 (+12/-0)
Reply | Quote
Re: Mobile set-up Problems


no not sorted, i wired my muppet rig back to the fag lighter and i only get interference from the heater fan, and when i switch lights on i'm not gettin interference from that just a flick of needle and back where it was. the swr on the mag mount is stil high, i'm wondering if there could be water in the coax because i'm sure i spoke to my friend and the radio was working fine, then after fridays rain it seems to have gained this problem???

---

13/Jan/2008, 10:14 pm Link to this post Send Email to topbuzzuk   Send PM to topbuzzuk Yahoo
 


Add a reply

Page:  1  2 





You are not logged in (login)