CB Install Help - Jeep Wrangler Forum
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > JK Jeep Wrangler Forum > JK Tech Forum

Join Wrangler Forum Today


Reply
 
Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 12-24-2015, 10:30 PM
Thread Starter
  #1
Jeeper
 
Join Date: Mar 2015
Posts: 165
CB Install Help

Looking for a little help here (please!).

I've got a very high SWR (3.5) on channels 1 and 40 (it's actually the same SWR on all channels). I've spent the entire day reading and testing, and cannot figure this thing out.

Over the summer I used the CB once for wheeling, then took the antenna off and the CB out. Left the wiring in place. Had a normal/good SWR using the same setup, except instead of the hardtop that's on now, I had a Trektop NX angled soft top on.

Everything I'm reading and testing is leading me to believe it's a ground problem. So...how would I go about fixing this? What am I missing? This is driving me crazy.

- Tested cable for continuity with a multimeter. Reads correctly between the insides, between the shields, etc. Cable seems to be fine, and not the issue.

- Picked up a magnetic mount CB antenna kit from Walmart. Plugged that in and tested that mounted on the hood to see if SWR changed to make sure the radio itself was good. Without any real tuning, just a quick setup and one adjustment, was a match at 2.1 SWR on both channels 1 and 40. Makes me think the radio is OK if a different antenna setup gives a better and different SWR.

- Reading through Firestik's website and troubleshooting, they state that 75% of all antennas returned haven't even been adjusted/changed so they haven't been tuned (meaning the people installing them just returned them stating they are bad but didn't actually adjust anything out of the box), and that of all returned antennas that are presumed broken, only 3% actually have an issue. Thus, I'm thinkin the antenna is OK.

- Adjusted the tip of the Firestik, nothing. Added a 4" antenna spring, nothing.

Cable - check
CB - check
Antenna - check (sort of, playing the odds here)

So why am I getting such a high SWR?

Has to be a grounding issue...so how would I ground this? I have a Smittybilt XRC rear bumper/tire carrier. I ground down where the antenna mount meats them (so there's no paint), and ground down the antenna mount (no paint). No change in SWR.

Took a 12 gauge wire, put connectors on it, and connected it to the antenna at the antenna mount, and connected the other end to a bolt on the body of the Jeep in the trunk area. Didn't help anything.

I'm at a total loss here!!

**My last thought on this: I don't have any sort of special connector at the cb mount. The cable comes up through the bottom, and the antenna screws on at the top. Sandwiched in between is the RR mount. I've seen some mounts that have a rubber/plastic isolator. Mine does not, I simply screw the cable into the antenna, and since the mount is in the middle, it stays in place. Is this affecting my ground?


INFO:
2015 JKU

Uniden 520XL CB:
Amazon.com: Uniden PRO520XL 40-Channel CB Radio: Car Electronics

5' Firestik Antenna (maybe its 4' though):
http://www.amazon.com/FireStik-feet-...restik+antenna


Rugged Ridge CB Antenna Mount (Rugged Ridge 11503.89 - Rugged Ridge CB Antenna Mount for 07-16 Jeep® Wrangler & Wrangler Unlimited JK - Quadratec

Quick Disconnect CB Mount:
Quadratec Exclusive JK-CBM11 - Quick Disconnect CB Radio Mount for 07-16 Jeep® Wrangler & Wrangler Unlimited JK with Uniden Pro 510XL Radios - Quadratec

AWhiteJeep is offline   Quote
Old 12-25-2015, 12:33 AM   #2
Jeeper

WF Supporting Member
 
Join Date: Sep 2014
Location: Cheyenne, WY
Posts: 3,456
You HAVE to have the isolator. You are basically grounding the center of the cable (whip) to the frame. And it has to be the stepped isolator like you see below so that the mount is completely isolated

Once all done, if you have a multi-meter at the connector end, put the leads on center to shield (connector) and make sure you see an open.



and the isolator has to be on top

__________________
'14 Willys JK Traded-In \
☻☻☻☻☻☻☻☻☻☻☻☻--- '18 Ram 2500HD CTD
'14 JKU SarahaTraded-In /
WillyD is offline   Quote
Old 12-25-2015, 03:53 AM
Thread Starter
  #3
Jeeper
 
Join Date: Mar 2015
Posts: 165
Thank you WillD. Just purchased the connector on Amazon.
AWhiteJeep is offline   Quote
Sponsored Links
Advertisement
 
Old 12-25-2015, 05:53 AM   #4
Jeeper

WF Supporting Member
 
Join Date: Sep 2014
Location: Cheyenne, WY
Posts: 3,456
Quote:
Originally Posted by AWhiteJeep View Post
Thank you WillD. Just purchased the connector on Amazon.
Not a problem, it's already too late, but next time, see if you have any truckstops in your area. That is where I get everything but the mounting bracket. Prices are a lil higher, but I like the ability to check it out, instead of relying on pics. I have lil wait patience and attention spa.... Look squirrel.
__________________
'14 Willys JK Traded-In \
☻☻☻☻☻☻☻☻☻☻☻☻--- '18 Ram 2500HD CTD
'14 JKU SarahaTraded-In /
WillyD is offline   Quote
Old 12-25-2015, 07:08 PM
Thread Starter
  #5
Jeeper
 
Join Date: Mar 2015
Posts: 165
Quote:
Originally Posted by WillyD View Post
Not a problem, it's already too late, but next time, see if you have any truckstops in your area. That is where I get everything but the mounting bracket. Prices are a lil higher, but I like the ability to check it out, instead of relying on pics. I have lil wait patience and attention spa.... Look squirrel.
Haha...I hear you! I'm the same. Gotta love Amazon Prime and Same Day Delivery. The part is actually a same day delivery item, but since I bought it last night, and today is Christmas, it wont be delivered until tomorrow.

We don't have many trucks stop immediately close by, but, if I couldn't get it delivered Saturday via Prime, my next option was to drive out to a truck stop, as the plan is to get the CB up and running for wheeling on Sunday.
AWhiteJeep is offline   Quote
Old 12-27-2015, 09:26 PM
Thread Starter
  #6
Jeeper
 
Join Date: Mar 2015
Posts: 165
Ok...so part arrived, installed. After some tuning of the antenna tip and putting on the 4" spring again, I've got channel 40 to 1.1 and channel 1 to 1.5. Close enough, or should I keep tuning to try to get it the same? I feel like this is the lowest I can adjust the 1.5 down to, channel 40 being the same. Lowering the tip just raises channel 1 a bunch right away.

*CB is only for wheeling. Although wouldn't mind picking up some trucker traffic sometimes. (if they're even using them anymore these days)

On a side note. I've got a cobra handheld CB as well. I had my wife drive one car with the handheld CB, and I drove the Jeep with the Uniden 520XL and the firestik install.

Once we got over 500' apart or so, she could hear everything I was saying, but I could not understand her well. That is, the transmission getting to her was fine, but coming to me was bad. Does this mean that my Jeep install works better/farther, and that the handheld is weak...or does it mean the opposite? That the handheld is working better than the Jeep setup?

Thanks again for the help.
AWhiteJeep is offline   Quote
Old 12-28-2015, 06:35 AM   #7
Jeeper
 
Join Date: Nov 2011
Posts: 186
Your SWR is fine, the reason your wife can hear you, but you don't hear her very well is that the fixed transmitter is likely mote powerful than the one in the handheld.
the rock99 is offline   Quote
Old 12-28-2015, 09:26 AM   #8
Jeeper
 
Adam04's Avatar
 
Join Date: Aug 2014
Location: Huntsville, AL
Posts: 117
Quote:
Originally Posted by the rock99 View Post
Your SWR is fine, the reason your wife can hear you, but you don't hear her very well is that the fixed transmitter is likely mote powerful than the one in the handheld.
Not likely. The FCC limits the power of CB radios to 4 watts. Antenna placement/tuning is really the only way to increase range. The difference is that the handheld's antenna was inside a metal box. The jeep's exterior and taller antenna was able to project a clear signal inside of the metal box but the handheld was likely unable to get a clear one out.
__________________
2015 JKU Sport
Adam04 is offline   Quote
Old 12-28-2015, 08:12 PM
Thread Starter
  #9
Jeeper
 
Join Date: Mar 2015
Posts: 165
Thanks folks.

CB works well enough for wheeling, and today on the highway had a trucker come over the CB complaining about someone without their headlights on. Didn't have any trucks in the immediate vicinity in front or behind me that I could see...so guessing the range must be pretty decent.

Good enough for me I guess.

Thanks again.

AWhiteJeep is offline   Quote
Reply

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






All times are GMT -5. The time now is 06:28 AM.


Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.1
User Alert System provided by Advanced User Tagging v3.1.0 (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.

Jeep, Wrangler, Liberty, Wagoneer, Cherokee, Gladiator, Mopar and Grand Cherokee are copyrighted and trademarked to FCA US LLC.
Wranglerforum.com is not in any way associated with FCA US LLC.