CB Antenna help needed. - Jeep Wrangler Forum
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > General Jeep Discussions > Communications and Electronics

Join Wrangler Forum Today


Reply
 
Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 02-02-2014, 06:10 PM   #1
that guy

5-Year WF Supporting Member
WF Supporting Member
 
doclouie's Avatar
 
Join Date: Feb 2010
Location: Was in the mountains, now in Texas
Posts: 3,698
Images: 4
CB Antenna help needed.

Okay so I am tuning my CB antenna and I cannot get the SWR below 3.0. I pulled it all apart today to make sure everything was right and ground down some more paint and did some ohmmeter testing again. Here is what I am using:

Firestik 2' adjustable antenna Firestik FS CB Antenna | Right Channel Radios
Firestik 18' fireRing coax cable http://www.rightchannelradios.com/fi...-with-fme.html
Teraflex Driver's side CB mount Teraflex 1912001 - TeraFlex Drivers Side CB Antenna Mount for 55-06 Jeep® CJ, Wrangler YJ, TJ & Unlimited - Quadratec
FireRing Compatible stud Firestik K4R FireRing Compatible Stud | Right Channel Radios
SWR Meter & Cable SWR Meter with Jumper Cable | Right Channel Radios
Cobra 9 Ultra III radio Amazon.com: COBRA CB MOBILE COMPACT 40CH INST. CH 9 19ULTRAIII: Electronics

I tested the FireRing coax and the SWR coax and the ground to the middle pin had no connections. The resistance in both connections in both coax wires was just under 1 ohm.

Okay I have put the mount in place making sure that I ground down to metal all mounting locations on the Jeep and the Teraflex mount.

Click image for larger version

Name:	1.JPG
Views:	108
Size:	103.4 KB
ID:	729121

Name:  2.JPG
Views: 294
Size:  69.4 KB

I even ground down inside the fender where the nuts go. All holes are ground down as you can see above. (Even the ones you cannot see)

After I attached the mounting bracket I put the FireRing coax and stud together. You can see in the pictures that the plastic lip of the FireRing connector and the plastic washer on top are oriented correctly to isolate the antenna from the ground.
Click image for larger version

Name:	3.JPG
Views:	105
Size:	125.0 KB
ID:	729137

I then ran a continuity test to make sure there were no shorts or opens using the test below.
Click image for larger version

Name:	4.jpg
Views:	80
Size:	76.5 KB
ID:	729145

No problems came up with the continuity test. The resistance of the ground on my antenna cable to the body (or to electrical ground it is 1 ohm) is 1.3 ohms.

The extra cable that I had I ran back and forth like you would a 12" yarn skein and zip tied it in the middle. There are no kinks in the cable and the cable is routed up through the rubber grommet in the back corner of the driver's side of the Jeep. It then follows the cable harness forward until it comes to the floor and then it goes under the carpet to the center console and exits where the e-brake handle is.

I took it out to a very wide open level space where the nearest anything is about 150 yards away. I balanced it out and channel 1 & channel 40 are equal at just over 3.0 while channel 20 is at 2.1.

Any help would be very much appreciated as I am totally stumped.

__________________
2000 Sahara, 3.5" Rubicon Express Lift, 1" spring spacer & 1" Body Lift, 33" or 35" BFG Mud tires, Front & Rear ARB, Rancho 9000 shocks, UCF Ultra High Belly Up

doclouie is offline   Quote Quick Reply
Old 02-02-2014, 06:23 PM   #2
Knows a couple things...

WF Supporting Member
 
Jerry Bransford's Avatar
 
Join Date: Nov 2005
Location: Escondido, Calif.
Posts: 33,220
Images: 2
From the 2.1 SWR on 20 and 3:1 on 1 and 40, your antenna appears to be set to the correct length so there has to be something else going on. I see where you ground the areas around the bolt holes free of paint & powder coating, perhaps a small skinny star washer or similar around the three mounting bolts to assure those bare areas are actually in good electrical contact might help. The thickness of the surrounding paint/powder coating might be preventing them from actually touching & thin metal washers would assure the mount & tub are touching electrically as they must be.

I know NOTHING about Firestick's ring style mount, I've never seen one up front. But according to the drawing, the top of the vinyl part that the cable passes into is supposed to be grounded against the mounting bracket. It likely has the center connector the antenna double-ended nut threads onto insulated from a surrounding ground connection that needs to touch the mount's bare metal.

So the there should not be a second insulating washer underneath the mount, the top part of the vinyl part that is under the steel bracket needs to be well grounded.

__________________
When you have a choice, buy American.

Jerry Bransford is online now   Quote Quick Reply
Old 02-02-2014, 06:35 PM   #3
that guy

5-Year WF Supporting Member
WF Supporting Member
 
doclouie's Avatar
 
Join Date: Feb 2010
Location: Was in the mountains, now in Texas
Posts: 3,698
Images: 4
The plastic part underneath the mount actually goes right into the hole and the metal ring around the outside, the ground, makes good contact with the antenna mount which makes good contact to the body as noted by the resistance of about an ohm.

I will try the washer thing right now and note back.
__________________
2000 Sahara, 3.5" Rubicon Express Lift, 1" spring spacer & 1" Body Lift, 33" or 35" BFG Mud tires, Front & Rear ARB, Rancho 9000 shocks, UCF Ultra High Belly Up

doclouie is offline   Quote Quick Reply
Old 02-02-2014, 07:08 PM   #4
that guy

5-Year WF Supporting Member
WF Supporting Member
 
doclouie's Avatar
 
Join Date: Feb 2010
Location: Was in the mountains, now in Texas
Posts: 3,698
Images: 4
Well the washer thing did not help the SWR of 3.0. It is nice to live out in the country when you have a field 3 minutes from your house.
__________________
2000 Sahara, 3.5" Rubicon Express Lift, 1" spring spacer & 1" Body Lift, 33" or 35" BFG Mud tires, Front & Rear ARB, Rancho 9000 shocks, UCF Ultra High Belly Up

doclouie is offline   Quote Quick Reply
Old 02-03-2014, 11:51 AM   #5
Jeeper
 
sparky's Avatar
 
Join Date: Oct 2009
Location: Phila
Posts: 1,954
Agree with Jerry, those reading say your in the sweet spot.

Where were you when the measurements were made. If anybody was standing near the vehicle, SWR can get thrown off. You should be inside with the doors closed.

Is the SWR meter calibrated correctly, carefully nulled on the forward setting.
sparky is offline   Quote Quick Reply
Old 02-03-2014, 04:18 PM   #6
that guy

5-Year WF Supporting Member
WF Supporting Member
 
doclouie's Avatar
 
Join Date: Feb 2010
Location: Was in the mountains, now in Texas
Posts: 3,698
Images: 4
I did my SWR readings in a big open field with me inside and all doors shut. Nearest anything was a good 150 yards away. I have also picked up a new coax cable and will try tuning it again tonight. Cross your fingers for me.
__________________
2000 Sahara, 3.5" Rubicon Express Lift, 1" spring spacer & 1" Body Lift, 33" or 35" BFG Mud tires, Front & Rear ARB, Rancho 9000 shocks, UCF Ultra High Belly Up

doclouie is offline   Quote Quick Reply
Old 02-03-2014, 05:18 PM   #7
Knows a couple things...

WF Supporting Member
 
Jerry Bransford's Avatar
 
Join Date: Nov 2005
Location: Escondido, Calif.
Posts: 33,220
Images: 2
Quote:
Originally Posted by sparky View Post
Is the SWR meter calibrated correctly, carefully nulled on the forward setting.
X2, did you properly calibrate the swr meter per its instructions?
__________________
When you have a choice, buy American.

Jerry Bransford is online now   Quote Quick Reply
Old 02-03-2014, 07:43 PM   #8
that guy

5-Year WF Supporting Member
WF Supporting Member
 
doclouie's Avatar
 
Join Date: Feb 2010
Location: Was in the mountains, now in Texas
Posts: 3,698
Images: 4
There were no instructions about calibrating the SWR meter. How do I do that?
__________________
2000 Sahara, 3.5" Rubicon Express Lift, 1" spring spacer & 1" Body Lift, 33" or 35" BFG Mud tires, Front & Rear ARB, Rancho 9000 shocks, UCF Ultra High Belly Up

doclouie is offline   Quote Quick Reply
Old 02-03-2014, 11:17 PM   #9
Knows a couple things...

WF Supporting Member
 
Jerry Bransford's Avatar
 
Join Date: Nov 2005
Location: Escondido, Calif.
Posts: 33,220
Images: 2
Quote:
Originally Posted by doclouie View Post
There were no instructions about calibrating the SWR meter. How do I do that?
Ok this has been handled via PM, you did that correctly already.

Next question since we're grasping at straws here Brian... what does your cable have printed on it? Does it say RG58 which is the right stuff? Could the cable possibly be RG59 which is the wrong stuff (wrong impedance)?
__________________
When you have a choice, buy American.

Jerry Bransford is online now   Quote Quick Reply
Old 02-03-2014, 11:36 PM   #10
that guy

5-Year WF Supporting Member
WF Supporting Member
 
doclouie's Avatar
 
Join Date: Feb 2010
Location: Was in the mountains, now in Texas
Posts: 3,698
Images: 4
I will go and check.
__________________
2000 Sahara, 3.5" Rubicon Express Lift, 1" spring spacer & 1" Body Lift, 33" or 35" BFG Mud tires, Front & Rear ARB, Rancho 9000 shocks, UCF Ultra High Belly Up

doclouie is offline   Quote Quick Reply
Old 02-03-2014, 11:45 PM   #11
that guy

5-Year WF Supporting Member
WF Supporting Member
 
doclouie's Avatar
 
Join Date: Feb 2010
Location: Was in the mountains, now in Texas
Posts: 3,698
Images: 4
It says RG58 A/U.
__________________
2000 Sahara, 3.5" Rubicon Express Lift, 1" spring spacer & 1" Body Lift, 33" or 35" BFG Mud tires, Front & Rear ARB, Rancho 9000 shocks, UCF Ultra High Belly Up

doclouie is offline   Quote Quick Reply
Old 02-03-2014, 11:48 PM   #12
Knows a couple things...

WF Supporting Member
 
Jerry Bransford's Avatar
 
Join Date: Nov 2005
Location: Escondido, Calif.
Posts: 33,220
Images: 2
Well dang, that's the right cable type. Oh well, we'll get this sorted out sooner or later.
__________________
When you have a choice, buy American.

Jerry Bransford is online now   Quote Quick Reply
Old 02-04-2014, 12:02 AM   #13
that guy

5-Year WF Supporting Member
WF Supporting Member
 
doclouie's Avatar
 
Join Date: Feb 2010
Location: Was in the mountains, now in Texas
Posts: 3,698
Images: 4
I guess my last hope after I try out the other cable would be to buy a 3' antenna and only put it on the Jeep when it is needed.
__________________
2000 Sahara, 3.5" Rubicon Express Lift, 1" spring spacer & 1" Body Lift, 33" or 35" BFG Mud tires, Front & Rear ARB, Rancho 9000 shocks, UCF Ultra High Belly Up

doclouie is offline   Quote Quick Reply
Old 02-04-2014, 11:17 AM   #14
Jeeper
 
sparky's Avatar
 
Join Date: Oct 2009
Location: Phila
Posts: 1,954
Just trying all possible points.

Even though you have set the SWR meter correctly, would you be able to borrow another one to take readings.

2/1 on 19 is not unusable. You can transmit without damage. How does it perform there.
sparky is offline   Quote Quick Reply
Old 02-05-2014, 12:59 AM   #15
that guy

5-Year WF Supporting Member
WF Supporting Member
 
doclouie's Avatar
 
Join Date: Feb 2010
Location: Was in the mountains, now in Texas
Posts: 3,698
Images: 4
Unfortunately I do not have access to another SWR meter so I cannot test that. I did hook up a different CB and I ran a different coax cable to see if the current one had a problem. The SWR came back the same on channel 1 & channel 40, just above 3.0. I ordered a longer antenna so hopefully that will take care of the problem. I will let you know when it comes in. Thank you everyone for the help.
__________________
2000 Sahara, 3.5" Rubicon Express Lift, 1" spring spacer & 1" Body Lift, 33" or 35" BFG Mud tires, Front & Rear ARB, Rancho 9000 shocks, UCF Ultra High Belly Up

doclouie is offline   Quote Quick Reply
Old 02-11-2014, 08:57 PM   #16
that guy

5-Year WF Supporting Member
WF Supporting Member
 
doclouie's Avatar
 
Join Date: Feb 2010
Location: Was in the mountains, now in Texas
Posts: 3,698
Images: 4
Okay so I received my 3' firestik antenna and tuned it. I get a SWR of 2.5 on channel 1 & channel 40 with a SWR of 1.4 on channel 20. I am going to stick with this setup and call it good because I cannot fit a 4' firestik in my garage.

__________________
2000 Sahara, 3.5" Rubicon Express Lift, 1" spring spacer & 1" Body Lift, 33" or 35" BFG Mud tires, Front & Rear ARB, Rancho 9000 shocks, UCF Ultra High Belly Up

doclouie is offline   Quote Quick Reply
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Jeep Wrangler Forum 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 email address for yourself.
Email Address:

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.



Thread Tools

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 Off
Refbacks are Off




Download our Mobile App

» Network Links
»Jeep Parts
» Featured Product

All times are GMT -5. The time now is 11:45 AM.



Jeep®, Wrangler, Liberty, Wagoneer, Cherokee, and Grand Cherokee are copyrighted and trademarked to Chrysler Motors LLC.
Wranglerforum.com is not in any way associated with the Chrysler Motors LLC