Yet another high-SWR thread - JeepForum.com

Reply
 
LinkBack Thread Tools
post #1 of 17 Old 07-05-2013, 12:29 AM Thread Starter
LoneWolf
Registered User
 
LoneWolf's Avatar
2009 JK Wrangler 
 
Join Date: Oct 2003
Location: Amarillo
Posts: 179
Garage
Thought I'd done everything right -- I ground paint off the antenna mount, ran a ground strap from the stud to a bolt behind the mount and replaced my steel whip with a 3' Firestik, but my Cobra 75 WX ST still is showing a consistently high reading on all channels.

I'm showing approximately 4 to 4.5 on 1, 20 and 40. At least it's an identical reading on all channels, right?

What am I missing?

Sent from my iPhone using JeepForum


'09 JKX: smokeythejeep.wordpress.com 33" Duratracs│TF leveling kit│CC bumpers
LoneWolf is offline  
Sponsored Links
Advertisement
 
post #2 of 17 Old 07-05-2013, 06:22 AM
biffgnar
Moderator
 
biffgnar's Avatar
2006 TJ Wrangler 
 
Join Date: May 2008
Location: Westchester, NY
Posts: 19,602
Are the plastic washers at the bracket properly put together to isolate the core from the mount? You need to check where you have continuity. The Firestik tech page has some good diagrams about exactly how the mount goes together and where to check continuity.

#feelthejohnson
biffgnar is offline  
post #3 of 17 Old 07-05-2013, 09:44 AM Thread Starter
LoneWolf
Registered User
 
LoneWolf's Avatar
2009 JK Wrangler 
 
Join Date: Oct 2003
Location: Amarillo
Posts: 179
Garage
The plastic shoulder washer is right where the package said it should be. Haven't checked continuity yet, guess that'll be my next step.

Here are a couple of pics of my install.

Sent from my iPhone using JeepForum
Attached Images
   

'09 JKX: smokeythejeep.wordpress.com 33" Duratracs│TF leveling kit│CC bumpers
LoneWolf is offline  
post #4 of 17 Old 07-05-2013, 03:41 PM
CJ7-Tim
Real Jeeps have dents
 
CJ7-Tim's Avatar
2000 XJ Cherokee 
 
Join Date: Apr 2002
Location: out in the garage - Minneapolis
Posts: 24,686
Get rid of the extra "ground" wire. Are you sure you are correctly setting/adjusting the SWR meter for the testing ? Did you remove the paint from the mounting bracket where the stud mounts makes contact and from where the bracket and the Jeep body make contact ?

Excessive SWR of 3.0 or greater, is almost always from improper assembly of the antenna stud mount, or of the coax cable. You coax looks store bought, but you can still check it for continuity, and internal shorts.

See the Tech Help section at www.firestik.com for more ideas and for testing info. The Firestik info applies to all brands and types of CB antennas.

.

A recent Gallup public opinion poll shows the NRA, at 58% approval, has a higher approval rating than either Hillary Clinton or Barack Obama.

Progressive Liberalism: Bringing you new Healthcare ideas so wonderful, they have to include mandatory participation ...

Originally Posted by Ronald W. Reagan: Government is not the solution to our problems; Government is the problem.
CJ7-Tim is offline  
post #5 of 17 Old 07-22-2013, 08:04 PM Thread Starter
LoneWolf
Registered User
 
LoneWolf's Avatar
2009 JK Wrangler 
 
Join Date: Oct 2003
Location: Amarillo
Posts: 179
Garage
Quote:
Originally Posted by CJ7-Tim
Get rid of the extra "ground" wire. Are you sure you are correctly setting/adjusting the SWR meter for the testing ? Did you remove the paint from the mounting bracket where the stud mounts makes contact and from where the bracket and the Jeep body make contact ?

Excessive SWR of 3.0 or greater, is almost always from improper assembly of the antenna stud mount, or of the coax cable. You coax looks store bought, but you can still check it for continuity, and internal shorts.

See the Tech Help section at www.firestik.com for more ideas and for testing info. The Firestik info applies to all brands and types of CB antennas.
Losing the ground strap didn't change anything. I made sure I'd ground off plenty of paint from the mount and continuity looks fine.

It's still putting out plenty of signal -- a consistent 4-plus miles and 30 isn't unheard off. My only concern is potential damage to the radio.

Sent from my iPhone using JeepForum

'09 JKX: smokeythejeep.wordpress.com 33" Duratracs│TF leveling kit│CC bumpers
LoneWolf is offline  
post #6 of 17 Old 07-22-2013, 10:39 PM
Filthy-Beast
Registered User
2006 LJ Wrangler 
 
Join Date: Aug 2009
Location: Palatine
Posts: 2,332
Are sure you have a good meter?

13 JKUR Build thread

For Sale: 2013 4dr JK Painted black Hard Top JKUR 18/59 springs and shocks

97 TJ: daughter 1 - 2.5L, Auto, 2" BB, 31" GY Duratrac
98 TJ: Daugher 2 - 4.0L, 5spd, D44 rear
06 LJ Rubicon: mine - Rokmen full up-armor, 8 adjustable CAs, front bumper, sliders, corners, Shrockworks rear bumper, 3" AEV/BDS lift, Currie HD stearing and Antirock, MT/r - k 35x12.5, SuperWinch, MC Overlines, York OBA
13 JKU Rubicon: Wife's for now, Ace Rock rails & rear bumper tire carrier, Truck Lites, MC Game changer 3.5 lift, RR skids, PSC Brawler front bumper, Warn 9.5cti-s, 35" GY MTRs
Filthy-Beast is offline  
post #7 of 17 Old 07-23-2013, 08:01 AM Thread Starter
LoneWolf
Registered User
 
LoneWolf's Avatar
2009 JK Wrangler 
 
Join Date: Oct 2003
Location: Amarillo
Posts: 179
Garage
Quote:
Originally Posted by Filthy-Beast View Post
Are sure you have a good meter?
I'm tempted to wonder. After the most recent adjustments, the reading is almost exactly the same -- about 4 -- on all channels. I bought the meter, a Workman, brand new via eBay. How common is a bad SWR meter?

'09 JKX: smokeythejeep.wordpress.com 33" Duratracs│TF leveling kit│CC bumpers
LoneWolf is offline  
post #8 of 17 Old 07-23-2013, 09:00 AM
Filthy-Beast
Registered User
2006 LJ Wrangler 
 
Join Date: Aug 2009
Location: Palatine
Posts: 2,332
It's possible. Have you checked both the antenna cable and the jumper cable?

Just in case I'll ask. you are hooking the jumper cable to the CB and then the meter, the antenna to the meter. setting it in FWD position, Push Transmit button on the mic, while holding transmit in you adjust the dial so the meter's needle is at the top of the scale. Then move the switch to Ref and check the SWR reading?

13 JKUR Build thread

For Sale: 2013 4dr JK Painted black Hard Top JKUR 18/59 springs and shocks

97 TJ: daughter 1 - 2.5L, Auto, 2" BB, 31" GY Duratrac
98 TJ: Daugher 2 - 4.0L, 5spd, D44 rear
06 LJ Rubicon: mine - Rokmen full up-armor, 8 adjustable CAs, front bumper, sliders, corners, Shrockworks rear bumper, 3" AEV/BDS lift, Currie HD stearing and Antirock, MT/r - k 35x12.5, SuperWinch, MC Overlines, York OBA
13 JKU Rubicon: Wife's for now, Ace Rock rails & rear bumper tire carrier, Truck Lites, MC Game changer 3.5 lift, RR skids, PSC Brawler front bumper, Warn 9.5cti-s, 35" GY MTRs
Filthy-Beast is offline  
post #9 of 17 Old 07-23-2013, 02:47 PM Thread Starter
LoneWolf
Registered User
 
LoneWolf's Avatar
2009 JK Wrangler 
 
Join Date: Oct 2003
Location: Amarillo
Posts: 179
Garage
Quote:
Originally Posted by Filthy-Beast View Post
It's possible. Have you checked both the antenna cable and the jumper cable?

Just in case I'll ask. you are hooking the jumper cable to the CB and then the meter, the antenna to the meter. setting it in FWD position, Push Transmit button on the mic, while holding transmit in you adjust the dial so the meter's needle is at the top of the scale. Then move the switch to Ref and check the SWR reading?
I didn't think to check the jumper cable, but I did check the el cheapo Radio Shack coax.

Yup, following the proper procedure for the meter. If I had hair, I'd pull it out.

'09 JKX: smokeythejeep.wordpress.com 33" Duratracs│TF leveling kit│CC bumpers
LoneWolf is offline  
post #10 of 17 Old 07-23-2013, 07:15 PM
Filthy-Beast
Registered User
2006 LJ Wrangler 
 
Join Date: Aug 2009
Location: Palatine
Posts: 2,332
Could be a bad antenna, do you know anybody with one you could swap for a few minutes to test?

13 JKUR Build thread

For Sale: 2013 4dr JK Painted black Hard Top JKUR 18/59 springs and shocks

97 TJ: daughter 1 - 2.5L, Auto, 2" BB, 31" GY Duratrac
98 TJ: Daugher 2 - 4.0L, 5spd, D44 rear
06 LJ Rubicon: mine - Rokmen full up-armor, 8 adjustable CAs, front bumper, sliders, corners, Shrockworks rear bumper, 3" AEV/BDS lift, Currie HD stearing and Antirock, MT/r - k 35x12.5, SuperWinch, MC Overlines, York OBA
13 JKU Rubicon: Wife's for now, Ace Rock rails & rear bumper tire carrier, Truck Lites, MC Game changer 3.5 lift, RR skids, PSC Brawler front bumper, Warn 9.5cti-s, 35" GY MTRs
Filthy-Beast is offline  
post #11 of 17 Old 07-24-2013, 01:18 AM
JPNinPA
Registered User
2005 LJ Wrangler 
 
Join Date: Feb 2011
Location: Dayton
Posts: 2,330
Is your cable pinched, bent or cut anywhere? Do you have the excess rolled up?
Does your antenna come close to large metal objects like a rack, hi-lift or custom roll cage?
Take a multimeter and measure resistance from the antenna tip to the cable center lead at the radio.
How about antenna tip to the outer shield radio side? Between center conductor and outer shield? Lastly outer shield at the antenna to some area on the body or frame?

What readings do you get?

"Never look down on anyone unless your helping them up"- Jesse Jackson
JPNinPA is offline  
post #12 of 17 Old 07-24-2013, 12:51 PM Thread Starter
LoneWolf
Registered User
 
LoneWolf's Avatar
2009 JK Wrangler 
 
Join Date: Oct 2003
Location: Amarillo
Posts: 179
Garage
The reading is identical using my steel whip and the 3-foot Firestik, so I ruled out the antenna as a cause. The coax looks fine and went straight from the package onto the Jeep. Oddly enough, I do usually run with a small loop just before it connects to the CB remote box, but I pull the loop straight when I connect the SWR meter, so that isn't it, either. The coax does run along the stock sport cage, but I'd have thought the shielding would be enough to prevent interference.

Another oddity: Since I had the meter hooked up, I tested it at work the other night for giggles. I was parked with the antenna a scant four feet from a three-story brick building. I'd have thought it would throw the reading much higher. Instead, the reading on all channels dropped to just a tick above three.

'09 JKX: smokeythejeep.wordpress.com 33" Duratracs│TF leveling kit│CC bumpers
LoneWolf is offline  
post #13 of 17 Old 07-24-2013, 03:11 PM
Glasssplinter
Registered User
1994 ZJ 
 
Join Date: Sep 2010
Location: Farmington
Posts: 219
Coax can be bad out of the box. You have to test like JPNinPA said.

'94 ZJ, 4.0L, 231 TC
Icom V-8000 with 1/4 wave
Glasssplinter is offline  
post #14 of 17 Old 07-24-2013, 11:18 PM Thread Starter
LoneWolf
Registered User
 
LoneWolf's Avatar
2009 JK Wrangler 
 
Join Date: Oct 2003
Location: Amarillo
Posts: 179
Garage
I'm beginning to lean more toward the bad meter theory. Out of desperation and frustration, I pulled out my backup radio, a Uniden 510 Pro XL, and a magnetic mount antenna.

I wired up the radio and set the antenna on the hood. Initially, the meter read the same as it has before, but then it rapidly dipped below 2, then rapidly shot back up well above four. It did this a couple more times, then shot above the set mark and stayed there.

Sent from my iPhone using JeepForum

'09 JKX: smokeythejeep.wordpress.com 33" Duratracs│TF leveling kit│CC bumpers
LoneWolf is offline  
post #15 of 17 Old 07-25-2013, 05:28 AM
JPNinPA
Registered User
2005 LJ Wrangler 
 
Join Date: Feb 2011
Location: Dayton
Posts: 2,330
Do you not have a multimeter or just not telling you did check continuity?

"Never look down on anyone unless your helping them up"- Jesse Jackson
JPNinPA is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the JeepForum.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.



Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Posting Rules  
You may post new threads
You may 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 On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome