Rising Sun Member Forums  

Go Back   Rising Sun Member Forums > Other Hobbies > Ham & CB Radio Corner

Reply
 
Thread Tools
  #1  
Old 08-01-2008, 11:18 AM
MDH33's Avatar
MDH33 MDH33 is offline
Rising Sun Member
 
Join Date: Mar 2006
Location: Land of Corn
Posts: 5,794
Default CB and SWR

Please don't flame me because I don't have a HAM. Money is tight.

I recently installed a CB in my 60 and SWR tested it and it seems to be getting nice low readings. So, I tested my CB set-up in my 40 last night with the SWR meter and I'm getting really strange readings. I have a Firestick tunable antennae and the reading are really high and inconsistent. I can't get it to drop below 2.5, and sometimes, when I key the handset after calibrating and switching to the swr setting, the needle actually jumps past infinity. Tuning the tip doesn't seem to affect the readings much. It's either at 2.5 on channels 1 and 40 or pegged.

I checked the coax connection to the antennae and it looks correct. I followed the directions when installing it and I have it grounded as suggested. Is there a way to diagnose what the problem is or test if I'm grounded?

The CB seems to work well enough. I tested it with the 60 parked down the street and the incoming signal (from the 60) sounds very clear in my 40, the signal going out (from the 40 to the 60) sounded ok but with some noise.

I know almost nothing about radios, I just want these things to work clearly for trail use without frying the components. Any thoughts/ help appreciated.
__________________
--Martin

'85 FJ60
Reply With Quote
  #2  
Old 08-01-2008, 11:47 AM
MDH33's Avatar
MDH33 MDH33 is offline
Rising Sun Member
 
Join Date: Mar 2006
Location: Land of Corn
Posts: 5,794
Default

Also, I am wondering if I may have already damaged the radio with the high SWR because it occasionally jumps to other channels on it's own (no scan feature).
__________________
--Martin

'85 FJ60
Reply With Quote
  #3  
Old 08-01-2008, 12:56 PM
Beater's Avatar
Beater Beater is offline
Hard Core 4+
 
Join Date: Dec 2005
Location: denver
Posts: 2,779
Default

Is this a new unit? It sounds like a intermittent electronic failure in the unit itself. The first thing I would check is dissasembly the mic and check the contact area, and swap out all periphials on a diag basis.
__________________
a near-death experience is just god following "catch and release" regulations...


john (johnny) henley
Reply With Quote
  #4  
Old 08-01-2008, 01:04 PM
MDH33's Avatar
MDH33 MDH33 is offline
Rising Sun Member
 
Join Date: Mar 2006
Location: Land of Corn
Posts: 5,794
Default

Quote:
Originally Posted by Beater View Post
Is this a new unit?
No, about two years old. I SWR tested it when I installed it, and had readings of about 2. At that time I was running hard top and doors. Now I have no top, no doors.

Quote:
Originally Posted by Beater View Post
The first thing I would check is dissasembly the mic and check the contact area...
I'll try the mic from my 60 and see if it changes.

Quote:
Originally Posted by Beater View Post
...swap out all periphials on a diag basis.
I'm not sure what this means.

Thanks!
__________________
--Martin

'85 FJ60
Reply With Quote
  #5  
Old 08-01-2008, 01:13 PM
wesintl's Avatar
wesintl wesintl is offline
Hard Core 4+
 
Join Date: Aug 2005
Location: in da house
Posts: 7,579
Send a message via AIM to wesintl
Default

http://www.firestik.com/Tech_Docs/swr-trblshoot.htm
__________________
See you on the trail
WREK
Couple o' FJ40's, BJ70, UZJ100, TDI 66FJ40,82FJ60,97FZJ80
TLCA#4180
Reply With Quote
  #6  
Old 08-01-2008, 01:24 PM
MDH33's Avatar
MDH33 MDH33 is offline
Rising Sun Member
 
Join Date: Mar 2006
Location: Land of Corn
Posts: 5,794
Default

Quote:
Originally Posted by wesintl View Post
Good info, i missed that on their site. thanks!
__________________
--Martin

'85 FJ60
Reply With Quote
  #7  
Old 08-01-2008, 01:25 PM
DaveInDenver's Avatar
DaveInDenver DaveInDenver is offline
Hard Core 4+
 
Join Date: Jun 2006
Location: Larimer County
Posts: 6,562
Default

What model SWR meter do you have? Remember to zero the SWR on FWD or CAL, using the adjust knob to max needle swing. Then switch to REF or Read or SWR or something similar to see VSWR. Never need to touch the knob after calibrating it. Making sure the meter is giving you a valid reading.
__________________
'91 Toyota Pickup
'09 Kawasaki KLR650
'12 Gunnar Rockhound 29

"They say the test of literary power is whether a man can write an inscription. I say, 'Can he name a kitten?'" -- Samuel Butler
Reply With Quote
  #8  
Old 08-01-2008, 01:56 PM
MDH33's Avatar
MDH33 MDH33 is offline
Rising Sun Member
 
Join Date: Mar 2006
Location: Land of Corn
Posts: 5,794
Default

Quote:
Originally Posted by DaveInDenver View Post
What model SWR meter do you have? Remember to zero the SWR on FWD or CAL, using the adjust knob to max needle swing. Then switch to REF or Read or SWR or something similar to see VSWR. Never need to touch the knob after calibrating it. Making sure the meter is giving you a valid reading.
It's just a cheap meter I got off Ebay. I'm using it as you describe, it has the Calibrate/SWR switch. Once calibrated, when I key the handset and switch to SWR, it sometimes moves forward past infinity rather than dropping. It's not consistent though. After reading the troubleshooting link that Wes posted, I'm gong to try some continuity tests and maybe add a jumper ground to the frame. Right now the ground wire runs to the sheetmetal of the cowl.
__________________
--Martin

'85 FJ60
Reply With Quote
  #9  
Old 08-01-2008, 02:39 PM
Groucho's Avatar
Groucho Groucho is offline
Rising Sun Ham Guru
 
Join Date: Aug 2005
Location: Arvada, Colorado
Posts: 1,651
Default

Possibility of a random short? Can you do a continuity check on all individual pieces of the coax from the SO-239 at the radio end all the way to the antenna? If you have continuity from the center conductor and the shield, this would do similar to what you describe.
__________________
--Choose Wisely--
Reply With Quote
  #10  
Old 08-01-2008, 02:52 PM
MDH33's Avatar
MDH33 MDH33 is offline
Rising Sun Member
 
Join Date: Mar 2006
Location: Land of Corn
Posts: 5,794
Default

Quote:
Originally Posted by Groucho View Post
Possibility of a random short? Can you do a continuity check on all individual pieces of the coax from the SO-239 at the radio end all the way to the antenna? If you have continuity from the center conductor and the shield, this would do similar to what you describe.
Center conductor meaning the pin on the radio end of the coax, and shield being the "fastener" that connects the coax to the radio?
__________________
--Martin

'85 FJ60
Reply With 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


All times are GMT -6. The time now is 06:57 AM.


Powered by vBulletin® Version 3.7.1
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.