Birty Dastards Jeep Club

Tech Forum => Workshop => Topic started by: Mike Pavelin on May 17, 2009, 01:03:39 PM

Title: Calling CB geeks!
Post by: Mike Pavelin on May 17, 2009, 01:03:39 PM
Just reinstalling my CB into Mk. 2.

What do I need to do to minimise interferance from the Jeep electrical system.It always picked up quite a bit of electrical noise in Mk.1. It was previously powered via it's own fuse connected to the Aux/Radio fuse and had a good ground direct to the body. The antenna coax was in good condition.

Any thoughts appreciated.
Title: Re: Calling CB geeks!
Post by: turner on May 17, 2009, 01:28:08 PM
wire it up direct to your battery with an inline fuse holder
Title: Re: Calling CB geeks!
Post by: turner on May 17, 2009, 01:30:52 PM
and if poss fit your arial in the middle or your roof, preferebly drilled hole not mag mount, this will give best signal
Title: Re: Calling CB geeks!
Post by: turner on May 17, 2009, 01:36:04 PM
and if you want a mega signal use a 1 piece 9ft fibre glass tank whip (1/4 wave) and you could talk to the moon and back ha ha
Title: Re: Calling CB geeks!
Post by: Jeepthang on May 17, 2009, 04:28:45 PM
Mike

I read up a lot on the subject before installing my CB. As a consequence, my CB is linked directly to the battery with an in-line fuse and my antenna is drilled into the roof. It's located in the centre of the roof but towards the back because of the rack. It also has a quick release connection so that the antenna can be removed easily and quickly should it need to be.

I get very little interferance.
Title: Re: Calling CB geeks!
Post by: Mel B on May 18, 2009, 12:54:11 PM
What we used to do (and this was on the old AM sets, and it worked for me on the new? FM sets) is use a piece of telly arial cable, or satellite, as the live feed from the batts to the Squark box, the inner core wire was wired up to the live feed from the batt, and the outer braided bit was used as the earth feed, the outer braided bit shielded the live wire from a lot of exterior electrical interference.

I used the same thing when i was on the waggons, ERF's were notorious for electrical static, plastic cabs you see. 10-4?

Now depending where you mount your antenna, depends your transmission area, middle of the roof equates to all round transmission, like a circle, now slightly to the rear means most of your transmission will be thrown forward, like an oval facing forward, likewise mounted slightly to the front, means most of power will be facing rearward. Clear as mud yet?? #-o.
Title: Re: Calling CB geeks!
Post by: dxmedia on May 18, 2009, 01:11:09 PM
A suppressor ;)
Title: Re: Calling CB geeks!
Post by: dxmedia on May 18, 2009, 01:12:33 PM
http://cgi.ebay.co.uk/New-Ground-Loop-I ... 7C294%3A50 (http://cgi.ebay.co.uk/New-Ground-Loop-Isolator-car-audio-noise-suppressor_W0QQitemZ250412483617QQcmdZViewItemQQptZLH_DefaultDomain_3?hash=item250412483617&_trksid=p3286.c0.m14&_trkparms=72%3A1683%7C66%3A2%7C65%3A12%7C39%3A1%7C240%3A1318%7C301%3A1%7C293%3A1%7C294%3A50" onclick="window.open(this.href);return false;)

Not technically the right one - but an idea of what they are.
Title: Re: Calling CB geeks!
Post by: turner on May 18, 2009, 08:40:10 PM
have a look at this filter: http://www.lorrybits.com/product_info.p ... 3c7dc1de0e (http://www.lorrybits.com/product_info.php?pName=hot-line-filter&cName=cb-radio-accessories-other-cb-equipment&oscsid=56979fecefd90b2b7fbf6e3c7dc1de0e" onclick="window.open(this.href);return false;)
Title: Re: Calling CB geeks!
Post by: neilhull on May 18, 2009, 09:52:13 PM
In the 70s 80s when i played around with CBs had to suppress the alternator/ plug leads / coil /heater motor
Title: Re: Calling CB geeks!
Post by: PtP on May 19, 2009, 06:53:29 PM
Quote from: "Mike Pavelin"
........... It was previously powered via it's own fuse connected to the Aux/Radio fuse and had a good ground direct to the body..........
My '97 TJ is wired in a very similar way, except the ground is connected to the radio ground and I never get any interferance. The antenna and I suspect the rig mount provide additional grounding.
Title: Re: Calling CB geeks!
Post by: MOCAJ on May 19, 2009, 07:08:05 PM
mine are plugged into the fag lighter, that way i can move the cb between trucks.

Antennas are on the tailgate or swing away, dont seem to get any interference at all  :-D