Tuning CB radio antenna - AUSJEEPOFFROAD.COM Jeep News Australia and New Zealand


Go Back   AUSJEEPOFFROAD.COM Jeep News Australia and New Zealand > JEEP GARAGE > Jeep Installation and How To's


Portal Register Forums Trading Your Jeep New Garage Mark All Read

Post New Thread  Reply
 
Thread Tools Search this Thread
  #1  
Old 02-08-2017
Sockeye's Avatar
Sockeye  Sockeye is offline
Full Flexer
 
Join Date: Jun 2009
Location: Brisbane
Posts: 525
What Jeep do I drive?: WJ
Likes: 56
Liked 71 Times in 46 Posts
Default Tuning CB radio antenna

After a basic install I measured the SWR and run into rather unpleasant results.

With antenna in the mount on the nudge bar the SWR reads about 4.

With antenna dismounted and thrown flat on the bonnet it reads perfect 1.1.

As soon as I move the antenna, not to speak mount it vertically, the SWR reading goes bad again.

Any idea what is the culprit of the issue?











Sponsored Posts
  #2  
Old 02-08-2017
skipperau's Avatar
skipperau  skipperau is offline
Full Flexer
 
Join Date: Apr 2009
Location: Brisbane Southside
Age: 55
Posts: 598
What Jeep do I drive?: WJ
Likes: 65
Liked 148 Times in 118 Posts
Default

Possibly the quality of the connection where the cable goes into the mount?
Likes: (2)
  #3  
Old 03-08-2017
Nanook's Avatar
Nanook  Nanook is offline
AJOR Bronze
 
Join Date: Mar 2014
Location: Lake Macquarie, NSW.
Age: 49
Posts: 2,216
What Jeep do I drive?: JK
Likes: 571
Liked 847 Times in 593 Posts
Default

Quote:
Originally Posted by skipperau View Post
Possibly the quality of the connection where the cable goes into the mount?
That would be my first guess as well. Something may be loose or having a bad contact issue between it sitting upright and laying down.
__________________
Cheers,
Jamie
  #4  
Old 03-08-2017
skipperau's Avatar
skipperau  skipperau is offline
Full Flexer
 
Join Date: Apr 2009
Location: Brisbane Southside
Age: 55
Posts: 598
What Jeep do I drive?: WJ
Likes: 65
Liked 148 Times in 118 Posts
Default

Quote:
Originally Posted by Nanook View Post
That would be my first guess as well. Something may be loose or having a bad contact issue between it sitting upright and laying down.


Exactly right, I've been building quads and beams since I was a teenager so the quality of connections is always the first thing I check, especially looking for the braided shield having pulled out.

Doug.
Sponsored Posts
  #5  
Old 03-08-2017
bodgie's Avatar
bodgie  bodgie is offline
Lowranger Shocker
 
Join Date: Aug 2009
Location: Castle Hill, NSW
Posts: 1,719
What Jeep do I drive?: WG
Likes: 1
Liked 186 Times in 149 Posts
Default

Does the Micronta meter you have support UHF frequencies?

I'd be surprised if it if does, I'd suspect it would only be 27Mhz which may be creating a problem for you.

Check for short circuits on the cable too, this can create some issues.

Jason
Likes: (2)
  #6  
Old 03-08-2017
bodgie's Avatar
bodgie  bodgie is offline
Lowranger Shocker
 
Join Date: Aug 2009
Location: Castle Hill, NSW
Posts: 1,719
What Jeep do I drive?: WG
Likes: 1
Liked 186 Times in 149 Posts
Default

Definitely SWR meter is the issue: if the radio is UHF.

http://www.radiomuseum.org/r/radio_s...o_21_525b.html

Micronta Field Strength SWR Tester Cat. No. 21-525B;
Measurable RF Power: 1 to 1000 watts,
SWR: 1:1 to 3:1,
Impedance: 50 ohms,
Frequency: 3 to 30 MHz.
Likes: (2)
Sponsored Posts
  #7  
Old 03-08-2017
Ben-n-Jo's Avatar
Ben-n-Jo  Ben-n-Jo is offline
Established Member
 
Join Date: Apr 2016
Posts: 129
What Jeep do I drive?: WG
Likes: 25
Liked 16 Times in 16 Posts
Check out my Ride(s)
Default

Never used a swr meter on UHF and never had a drama.

Sent from my ZTE T84 using Tapatalk
Likes: (1)
  #8  
Old 04-08-2017
bodgie's Avatar
bodgie  bodgie is offline
Lowranger Shocker
 
Join Date: Aug 2009
Location: Castle Hill, NSW
Posts: 1,719
What Jeep do I drive?: WG
Likes: 1
Liked 186 Times in 149 Posts
Default

Antennas are typically pre-tuned, so you will probably be OK. It is always good to check the SWR as it lets you know if there is a fault or suboptimal antenna placement.

Jason
  #9  
Old 04-08-2017
Sockeye's Avatar
Sockeye  Sockeye is offline
Full Flexer
 
Join Date: Jun 2009
Location: Brisbane
Posts: 525
What Jeep do I drive?: WJ
Likes: 56
Liked 71 Times in 46 Posts
Default

Thanks guys.

Looks like my SWR meter is out of date.

Is this normally practiced to tune the antenna/radio combos to the best SWR or shops generally stick the antennas on the bullbars without worrying to much about the ratios?

Question to myself. Show I get a proper SWR meter?
Post New Thread  Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

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 On


» Advertisements_AS2
Powered by vBadvanced CMPS v3.2.3



All times are GMT +10. The time now is 05:29 PM.




AJOR does not vouch for or warrant the accuracy, completeness or usefulness of any message, and are not responsible for the contents of any message. The messages express the views of the author of the message, not necessarily the views of AJOR or any entity associated with AJOR, nor should any advice be substituted as technical advice replacing that of a mechanic. You agree, through your use of this service, that you will not use AJOR to post any material which is knowingly false and/or defamatory, inaccurate, abusive, vulgar, hateful, harassing, obscene, profane, sexually oriented, threatening, invasive of a person's privacy, religious, political or otherwise violative of any law. You agree not to post any copyrighted material unless the copyright is owned by you or by AJOR. The owner, administrators and moderators of AJOR reserve the right to delete any message or members for any or no reason whatsoever. You remain solely responsible for the content of your messages, and you agree to indemnify and hold harmless AJOR, the administrators, moderators, and their agents with respect to any claim based upon transmission of your message(s). The use of profile signatures to intentionally mislead or misdirect any member on this forum is not acceptable and may result in your account being suspended. Any trip that is organised through the AJOR forum is participated at your own risk. If you or your vehicle is damaged it is your responsibility, not that of the person that posted the thread, message or topic initiating the trip, nor the organisers of AJOR or moderators of any specific forum. This forum and associated website is the property of AJOR.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2019, vBulletin Solutions, Inc.

AJOR 2002 - 2019 AUSJEEPOFFROAD.COM. All corporate trademarked names and logos are property of their respective owners. Ausjeepoffroad is in no way associated with DaimlerChrysler Corporation or Fiat Jeep.
www.ausjeep.com www.ausjeep.com.au www.midlifemate.com ausjeepforum.com Jeep Wrangler JL Australia release
vB Ad Management by =RedTyger=