setting your antenna SWR - Ranger-Forums - The Ultimate Ford Ranger Resource


General Ford Ranger Discussion General discussion of the Ford Ranger that does not fit in any other sub-forum.

Reply
 
LinkBack Thread Tools Search this Thread
  #1  
Old 04-14-2006
crawly1025's Avatar
Member
Thread Starter
 
Join Date: Jul 2005
Location: Steubenville Ohio
Posts: 1,361
setting your antenna SWR

Reply With Quote
  #2  
Old 04-14-2006
n3elz's Avatar
RF Veteran
 
Join Date: Jun 2004
Location: Kennett Square, PA
Posts: 10,620
Very nice write up!

I like this:
Quote:
Originally Posted by Firestik
# If SWR on all channels is above 2.0 but not in the "red zone" (normally over 3.0), you may be experiencing coaxial cable reaction (bad quality, wrong length, etc.), insufficient ground plane, or have an ungrounded antenna mount.
I have occasionally had people tell me the coax length doesn't matter. But in fact, an odd number 1/4 wavelengths transforms the impedance. You need an even number of quarter wavelengths, or much less than a 1/4 wavelength for a short cable, to get a good match.

This is why a 15 to 22 foot length of coax is often the best. Getting it down around 8 to 12 feet, or up around 27 feet, may cause problems.

Also, we had that exact problem with Luke (shadyluke) when he mounted his antenna on his camper cap. He grounded the mount using a pretty long wire and it was acting as part of the antenna circuit (making his whip in to a dipole) and it wouldn't tune. I had him shorten the ground lead down to a foot or two long, and it tuned like a champ then.
Reply With Quote
  #3  
Old 04-14-2006
rangererv's Avatar
Member
 
Join Date: Mar 2005
Location: Dearborn Michigan
Posts: 4,376
cool, my uncle has the meter, but we didnt no how to use it, now ill have to check it.
Reply With Quote
  #4  
Old 04-14-2006
crawly1025's Avatar
Member
Thread Starter
 
Join Date: Jul 2005
Location: Steubenville Ohio
Posts: 1,361
yeah theres alot of good reading on there under the tech docs, just go back to the main page. it helped me out quite a bit.
Reply With Quote
  #5  
Old 04-17-2006
TheManInBlack's Avatar
Member
 
Join Date: Mar 2005
Location: Lillington, NC
Posts: 304
I pretty sure i cant tune mine but i will ask anyways, i have a 102" steel whip is it tunable. and if not why do i have bad reception and a hole lot of static even when i mess with the squelch? and how do i get rid of it.
Reply With Quote
  #6  
Old 04-17-2006
n3elz's Avatar
RF Veteran
 
Join Date: Jun 2004
Location: Kennett Square, PA
Posts: 10,620
Either an engine noise problem, fuel pump problem, or other "emanator" of static. These are common on Rangers.

The other possibility is a bad ground at the antenna. You must make sure the sheild is grounded at the antenna end to ensure good performance.

Also, digital equipment you've added to the truck can radiate signals sometimes.

When noise is being radiated by something in the truck, it's a radio signal which your receiver pics up -- and the better the antenna, the louder the noise!

Does it do it when your truck is running only? Or when the key is on but not started? And if you can run it with the key off, that's helpful to look at also.

Let's start with those questions and see what else we can think of.
Reply With Quote
  #7  
Old 04-17-2006
TheManInBlack's Avatar
Member
 
Join Date: Mar 2005
Location: Lillington, NC
Posts: 304
actually know that you mention it it is not that bad when the truck is off but i have noticed it gets really bad when i romp on the gas.
Reply With Quote
  #8  
Old 04-17-2006
FireRanger's Avatar  
Join Date: May 2004
Location: CT
Posts: 0
Quote:
Originally Posted by TheManInBlack
I pretty sure i cant tune mine but i will ask anyways, i have a 102" steel whip is it tunable. and if not why do i have bad reception and a hole lot of static even when i mess with the squelch? and how do i get rid of it.
When you turn the squelch all the way down, it is supposed to go to "open squelch" which is nothing but static assuming there is nothing else on the channel.

If you don't hear any radio traffic ever, it means one of three things:

1. The radio is junk
2. The antenna or coax has a problem
3. There is nobody talking.
Reply With Quote
  #9  
Old 04-17-2006
Wowak's Avatar
Member
 
Join Date: Jun 2004
Location: Merritt Island, FL
Posts: 2,223
I've unfortunately never tuned my antennae (complicated by the fact that I alternate between a 3' and 5' firestikII) due to not knowing where to find/steal/borrow an SWR meter. Although I primarily use my CB to listen in on truckers for traffic info (and sometimes just for amusement) I would like my system optimized. The only abnormal condition I've noticed in my truck is that my horn causes significant static through my cab speaker.
Reply With Quote
  #10  
Old 04-17-2006
n3elz's Avatar
RF Veteran
 
Join Date: Jun 2004
Location: Kennett Square, PA
Posts: 10,620
Ha ha! Next time you come down for a meet, we'll tune all your antennas!
Reply With Quote
  #11  
Old 04-17-2006
n3elz's Avatar
RF Veteran
 
Join Date: Jun 2004
Location: Kennett Square, PA
Posts: 10,620
Quote:
Originally Posted by FireRanger
When you turn the squelch all the way down, it is supposed to go to "open squelch" which is nothing but static assuming there is nothing else on the channel.

If you don't hear any radio traffic ever, it means one of three things:

1. The radio is junk
2. The antenna or coax has a problem
3. There is nobody talking.
Ah, interesting -- I didn't think of it that way. I took his post to mean that no matter what he did with the squelch, all he got was static. My reply probably didn't make much sense to you, Matt, since you saw it differently, lol.
Reply With Quote
  #12  
Old 04-17-2006
FireRanger's Avatar  
Join Date: May 2004
Location: CT
Posts: 0
Well, if it is one or the other, he got an answer :)
Reply With Quote
  #13  
Old 04-17-2006
TheManInBlack's Avatar
Member
 
Join Date: Mar 2005
Location: Lillington, NC
Posts: 304
LOL Well i know my radio is crap it is form radio shack but unless i am on the highway i cant get any good signals and i know there are some around, so i think myabe it is just my crappy radio. thanks all
Reply With Quote
  #14  
Old 04-17-2006
shadyluke's Avatar
Member
 
Join Date: Mar 2005
Location: West Grove, PA
Posts: 2,077
Quote:
Originally Posted by n3elz
I had him shorten the ground lead down to a foot or two long, and it tuned like a champ then.
Actually John we shortened it from about 2 feet to about 2 inches. I had real cookin good SWR then. I have to retune tho John since I got a cap now thats made for my truck and have to make a new mount.
Reply With Quote
  #15  
Old 04-18-2006
n3elz's Avatar
RF Veteran
 
Join Date: Jun 2004
Location: Kennett Square, PA
Posts: 10,620
Very good, Luke. I couldn't remember how short we made it, only that we shortened it!

Well, you know what to do now, so you should be good to go!
Reply With Quote
  #16  
Old 04-18-2006
shadyluke's Avatar
Member
 
Join Date: Mar 2005
Location: West Grove, PA
Posts: 2,077
Yeah and we confirmed that the meter built into my radio functioned as it should compared to yours.
Reply With Quote
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
High SWR Dusty08 Interior Semi-Tech 41 04-06-2008 06:25 PM
Anyone in Anaheim/Orange CA have an SWR meter? Oasis General Technical & Electrical 9 01-17-2008 11:34 PM
I got a small SWR meter... Hawklore General Technical & Electrical 9 05-24-2007 06:48 PM
SWR tuning EricTodd General Technical & Electrical 11 12-10-2006 05:21 PM
9 foot CB antenna on bumper...SWR? Achped General Technical & Electrical 26 09-04-2005 12:56 AM


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 Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -6. The time now is 05:43 AM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.