CB Causes Instrument Panel to Shut down
JK Super Freak
Joined: Apr 2012
Posts: 1,475
Likes: 4
From: Bella Vista, AR
I do feel the answer here is to use a body mount that isn't designed around a "no ground" system. A quality mount will ground the antenna to the body of the vehicle and not use the coax as a radiating element. Check out Breedlove antenna mounts.
I think this would go a long way to solving your problems. I'm no sure it's even worth your effort to attempt use of ferrites (suppression chokes) since in this case feed line radiation is not a byproduct of a poor ground, but rather the design of the antenna system.
I think this would go a long way to solving your problems. I'm no sure it's even worth your effort to attempt use of ferrites (suppression chokes) since in this case feed line radiation is not a byproduct of a poor ground, but rather the design of the antenna system.
JK Junkie
Joined: May 2009
Posts: 2,811
Likes: 1
From: S. Texas
I do feel the answer here is to use a body mount that isn't designed around a "no ground" system. A quality mount will ground the antenna to the body of the vehicle and not use the coax as a radiating element. Check out Breedlove antenna mounts.
I think this would go a long way to solving your problems. I'm no sure it's even worth your effort to attempt use of ferrites (suppression chokes) since in this case feed line radiation is not a byproduct of a poor ground, but rather the design of the antenna system.
I think this would go a long way to solving your problems. I'm no sure it's even worth your effort to attempt use of ferrites (suppression chokes) since in this case feed line radiation is not a byproduct of a poor ground, but rather the design of the antenna system.
To the OP. Please answer the following questions to allow us to determine your next course of action.
- What type of antenna are you using with your molded side mount?
- Did you run a ground wire to the chassis at the antenna mount?
- Where did you terminate your negative lead from the radio?
I'm subscribed with instant notification so I'll know when there have been responses to the thread.
JK Super Freak
Joined: Apr 2012
Posts: 1,475
Likes: 4
From: Bella Vista, AR
He installed his in a completely different location with different coax routing. It's very likely that made a big difference.
A well-installed grounded antenna will outperform any well-installed "no ground" antenna system 100% of the time due to the basic physics of it. Well-balanced antenna systems work better.
This is of course not to say that a "no ground" system won't work! It may work quite well.
Systems that are designed around intentional feedline radiation are also going to be very prone to these sort of RFI problems that are inherent to the very unbalanced design of these antenna systems.
A well-installed grounded antenna will outperform any well-installed "no ground" antenna system 100% of the time due to the basic physics of it. Well-balanced antenna systems work better.
This is of course not to say that a "no ground" system won't work! It may work quite well.
Systems that are designed around intentional feedline radiation are also going to be very prone to these sort of RFI problems that are inherent to the very unbalanced design of these antenna systems.
Last edited by arjeeper; May 25, 2012 at 01:42 PM.
JK Newbie
Joined: Mar 2012
Posts: 7
Likes: 0
From: St. Charles, IL
A no ground plane antenna will not be a good performer/radiator. This type of antenna offers nothing compared to a well grounded properly installed antenna. It will however, cause all kinds of RF interference within the Jeep as the feedline is radiating. This is NOT want you want.
Your best bet is to throw it in the trash.
Regards,
Jim
Your best bet is to throw it in the trash.
Regards,
Jim
Thread Starter
JK Freak
Joined: Jun 2008
Posts: 560
Likes: 0
From: LAUREL,DE
Originally Posted by Hook-Em
So i gots ta know, why does mine work so well right out of the box with a properly grounded negative radio lead? I still do not know if we have all the answers from the OP to make a final determination and send him out to buy more gear after punching holes in his quarter panel. I'm not saying you are right or wrong, just that we need more information.
To the OP. Please answer the following questions to allow us to determine your next course of action.
[*]What type of antenna are you using with your molded side mount?[*]Did you run a ground wire to the chassis at the antenna mount?[*]Where did you terminate your negative lead from the radio?
I'm subscribed with instant notification so I'll know when there have been responses to the thread.
1 the antenna is a non grounded type. It is made of graphite.
2 there is no ground goin from the mount to the chassis.
3 The ground for the radio is wire direct to the battery.
Also I'll add that I have no problems when I have the key turned to the accessory position everything works fine.
JK Newbie
Joined: Mar 2012
Posts: 7
Likes: 0
From: St. Charles, IL
First and foremost Thanks to everyone for your help. Here are my answers the above questions.
1 the antenna is a non grounded type. It is made of graphite.
2 there is no ground goin from the mount to the chassis.
3 The ground for the radio is wire direct to the battery.
Also I'll add that I have no problems when I have the key turned to the accessory position everything works fine.
1 the antenna is a non grounded type. It is made of graphite.
2 there is no ground goin from the mount to the chassis.
3 The ground for the radio is wire direct to the battery.
Also I'll add that I have no problems when I have the key turned to the accessory position everything works fine.
2. I would personally ground the antenna shield/mount to the chassis. You will be surprised with the results. A few turns (4-5 about 4 1/2" diameter) of the RG58 feed line near the antenna will help prevent common mode currents, help eliminate RF interference and overall, keep the feed line from radiating.
Basically, any non-grounded antenna, (mag mount, glass mount )isn't very efficient/effective.
Regards,
Jim
