CB Antenna Mounting - Page 2 - Defender Source
Defender Source  

Go Back   Defender Source > Defender & Series Technical Discussions > Defender Technical Discussions


Reply
 
Thread Tools
  #21  
Old February 23rd, 2010, 01:08 PM
ajh
Status: Offline
Andrew J. Hutton
1993 Defender 110 200TDI
Member
 
Join Date: Oct 2007
Location: Ottawa, Ontario, Canada
Posts: 735
Looking at tha mount I would worry about strength. What I was thinking was a good solid clamp then something like a series windshield hinge with a cross-pin hole for up and one for down along with a clip for the antenna near the top for keeping it from vibrating against the rack when folded. The have quite a load on them in the wind and a spring mount is still needed to make sure you do not shear it off on something, ideally nothing unsprung would extend above the top bar of the rack or you know you will find a tree branch and break it.

I also forgot to mention that the above "screening" by the vehicle is why truckers mount one on each side of the cab.

Another option is a 3x wave whip, I may end up needing something like this for the shortwave when using it for data/basecamp duties, you attach one end at the front wing and bend it back. Of course if you go MOD FFR you could also use radio boxes
__________________
--

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
- Parts & Accessories Imported Weekly

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
- Like us on Facebook for a discount on parts!

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
- Handmade Soap ideal for Mechanics!
Reply With Quote
Sponsored Links
Advertisement
 
  #22  
Old February 23rd, 2010, 03:22 PM
cellulararrest's Avatar
cellulararrest
Status: Offline
Chris Snyder
1994 D90 #614 | '07 L322 SC
Member
 
Join Date: Feb 2006
Location: Newburyport, MA
Posts: 1,544
Quote:
Originally Posted by ajh View Post
I also forgot to mention that the above "screening" by the vehicle is why truckers mount one on each side of the cab.
That's phasing... They feed two antennas in phase to provide gain (directivity) front and back. Doing that can net you up to 3db if they're setup optimally.
Reply With Quote
  #23  
Old February 23rd, 2010, 03:37 PM
phoenix37's Avatar
phoenix37
Status: Offline
john
97 D90 ST / 1957 S1 109/ 1983 LS110
Member
 
Join Date: Feb 2008
Location: Venice, CA/Yarmouth,ME
Posts: 5,787
Registry
Quote:
Originally Posted by cellulararrest View Post
Just remember... All you have to do to ground an antenna adequately on a vehicle is attach the coax shield to the body/frame. It's not an involved process and will yield better results. Don't be afraid of it.

What is a coax shield and how do you attach it to the frame? Ive got my antenna mounted to the tire carrier which doesnt seem to be properly grounded.
Reply With Quote
Sponsored Links
Advertisement
 
  #24  
Old February 23rd, 2010, 03:42 PM
cellulararrest's Avatar
cellulararrest
Status: Offline
Chris Snyder
1994 D90 #614 | '07 L322 SC
Member
 
Join Date: Feb 2006
Location: Newburyport, MA
Posts: 1,544
Coax shield is the braid that is the outermost conductor inside the cable. So it goes, from the center: center conductor, dialectric (usually that thick plastic stuff), shield (braid), then outside insulation.

Depending on what mount you're using, the mount itself is probably connected to the shield.

Do you have a picture of your mount?
Reply With Quote
  #25  
Old February 23rd, 2010, 05:22 PM
phoenix37's Avatar
phoenix37
Status: Offline
john
97 D90 ST / 1957 S1 109/ 1983 LS110
Member
 
Join Date: Feb 2008
Location: Venice, CA/Yarmouth,ME
Posts: 5,787
Registry
Here is a pic.
Attached Thumbnails
Click image for larger version

Name:	cbmount.jpg
Views:	145
Size:	55.6 KB
ID:	25376  
Reply With Quote
  #26  
Old February 23rd, 2010, 05:33 PM
cellulararrest's Avatar
cellulararrest
Status: Offline
Chris Snyder
1994 D90 #614 | '07 L322 SC
Member
 
Join Date: Feb 2006
Location: Newburyport, MA
Posts: 1,544
If you take the connector off the bottom of that mount, you'll see that there are two conductors. There's the middle conductor, and then the outer conductor (the threads).

That outer conductor needs to go to ground (your tire carrier). The center conductor needs to go to your antenna.

Make sure that the center conductor passes through the hole you drilled and is insulated from your tire carrier by those nylon washers. It can't touch the sides of the hole (the hole needs to be wide enough) otherwise you'll have a short and end up destroying your radio and not being heard.

If you have a multi-meter, you can test and see if your mount is right by checking continuity between the outer portion of the coax (while connected to your mount) and your frame.

Then to make sure you don't have a short between the shield and the center conductor, make sure there is NO continuity between the top of the mount and your frame.

------ Follow up post added February 23rd, 2010 05:35 PM ------

Or, at the radio end of the coax just make sure there's no continuity between the inner and outer conductor. (this is all assuming that you don't have a no ground plane setup)
Reply With Quote
  #27  
Old February 23rd, 2010, 05:41 PM
phoenix37's Avatar
phoenix37
Status: Offline
john
97 D90 ST / 1957 S1 109/ 1983 LS110
Member
 
Join Date: Feb 2008
Location: Venice, CA/Yarmouth,ME
Posts: 5,787
Registry
Got it. Thanks Chris.
Reply With Quote
  #28  
Old February 23rd, 2010, 05:42 PM
cellulararrest's Avatar
cellulararrest
Status: Offline
Chris Snyder
1994 D90 #614 | '07 L322 SC
Member
 
Join Date: Feb 2006
Location: Newburyport, MA
Posts: 1,544
Hopefully that made sense. Hard to describe without actually showing you!
Reply With Quote
  #29  
Old February 23rd, 2010, 05:47 PM
phoenix37's Avatar
phoenix37
Status: Offline
john
97 D90 ST / 1957 S1 109/ 1983 LS110
Member
 
Join Date: Feb 2008
Location: Venice, CA/Yarmouth,ME
Posts: 5,787
Registry
I understand what part needs to be grounded now so ill just try and make that happen. the local 4x4 shop said my tire carrier wouldnt work as a ground and I need to run a ground from the mount to the frame.
Reply With Quote
  #30  
Old February 23rd, 2010, 05:49 PM
cellulararrest's Avatar
cellulararrest
Status: Offline
Chris Snyder
1994 D90 #614 | '07 L322 SC
Member
 
Join Date: Feb 2006
Location: Newburyport, MA
Posts: 1,544
Well it's an easy check with a multi-meter. Mine was connected fine. If you want it to be perfect, you'd run grounding straps between all the body panels, but that's a bit excessive for just trail communications...

------ Follow up post added February 23rd, 2010 06:09 PM ------

I doubt anyone does, but if you want to read about bonding... http://www.k0bg.com/bonding.html

For whatever reason, a lot of CB shops have some weird ideas about all this stuff.
Reply With Quote
  #31  
Old February 23rd, 2010, 06:44 PM
phoenix37's Avatar
phoenix37
Status: Offline
john
97 D90 ST / 1957 S1 109/ 1983 LS110
Member
 
Join Date: Feb 2008
Location: Venice, CA/Yarmouth,ME
Posts: 5,787
Registry
Thanks again Chris and yes it would be just for trail communications. I used an FRS radio for the first time on the trail this weekend and the range was terrible. I thought if was really stuck out here with just this walkie talkie id be screwed.
Reply With Quote
  #32  
Old March 4th, 2010, 12:50 PM
Manimal's Avatar
Manimal
Status: Offline
Carl Jonsson
1995 NAS D90 #219
Site Team
 
Join Date: Sep 2008
Location: Portland, OR
Posts: 3,236
I just ordered a CB. What kind of antenna should I get? AM/FM? HF? VHF/UHF? Is there such a thing as a CB specific antenna?
Reply With Quote
  #33  
Old March 4th, 2010, 10:05 PM
JFD's Avatar
JFD
Status: Offline
Julien Dalbin
05 Tdi 90
Member
 
Join Date: Mar 2005
Location: Dominican Republic
Posts: 1,888
11 meters so i think it's HF.
__________________
" Eventually everything connects - people, ideas, objects. The quality of the connections is the key to quality per se. "
- Charles Eames
Reply With Quote
  #34  
Old March 4th, 2010, 10:15 PM
Rugbier's Avatar
Rugbier
Status: Offline
Gustavo
110 Tdi - 110 N/A - D3 HSE - RRS SC
Member
 
Join Date: Jul 2008
Location: Peoples Republic of Marylandistan
Posts: 5,884
Registry
Firestick NGP, mount it in any surface you want.

my old 90 had an anodized bracket mounted on the Tire Carrier and the antenal mount bolted to it.

Maybe Chirs Bird will post a pic ( I can't find one ), but available a Quadratec under roll cage mounts


Quote:
Originally Posted by Manimal View Post
I just ordered a CB. What kind of antenna should I get? AM/FM? HF? VHF/UHF? Is there such a thing as a CB specific antenna?
__________________
NO SIGNATURE
Reply With Quote
  #35  
Old March 5th, 2010, 01:12 PM
Red90's Avatar
Red90
Status: Offline
John B.
1991 Defender 90, 200TDI
Site Team
 
Join Date: Sep 2003
Location: Calgary
Posts: 9,237
Registry
I have the Firestik side mount on the back. 7 year and lots of abuse. No problems.

http://www.firestik.com/Catalog/MK-M2.htm
Reply With Quote
  #36  
Old March 6th, 2010, 03:30 PM
Manimal's Avatar
Manimal
Status: Offline
Carl Jonsson
1995 NAS D90 #219
Site Team
 
Join Date: Sep 2008
Location: Portland, OR
Posts: 3,236
Firestik it is.

Another CB-newbie question. Is there a way to hook the CB up to external (dash or door) speakers or do you guys only rely on the built in cb speaker?
Reply With Quote
  #37  
Old March 6th, 2010, 07:35 PM
Red90's Avatar
Red90
Status: Offline
John B.
1991 Defender 90, 200TDI
Site Team
 
Join Date: Sep 2003
Location: Calgary
Posts: 9,237
Registry
It depends on the CB, but many have external speaker outputs.
Reply With Quote
Reply

Lower Navigation
Go Back   Defender Source > Defender & Series Technical Discussions > Defender Technical Discussions

Tags
mount

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Ghetto-Gardô CB Antenna Mount Ren Ching Smaller Projects 13 August 6th, 2009 03:29 PM
Mounting a CB antenna on a 1997 D90 SW? pmd Defender Technical Discussions 13 January 11th, 2007 11:47 PM
CB Antenna Splitter bjenk Defender Technical Discussions 2 March 28th, 2005 08:45 AM
Antenna Wanted For 95 D90 Rockhead12 Wanted 2 January 12th, 2005 06:12 PM
CB mounting ideas flippedrover Defender Technical Discussions 21 March 29th, 2004 11:22 PM


All times are GMT -5. The time now is 05:20 AM.


Copyright