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Old 10-28-2012, 05:32 PM
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my cb

when i key up my cb this is the light i get. is this right? red?

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Old 10-28-2012, 07:36 PM   #2
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Unless I am mistaken, the top light indicates recieving or transmitting, the bottom indicates high swr. Bottom should not be on.

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Old 10-28-2012, 07:47 PM
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ya i did not think it should be red. red is never good
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Old 10-28-2012, 07:53 PM   #4
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Quick question, is your antenna shaft insulated from the mount with a nylon washer? Thats the most common cause of high (>3) swr.
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Old 10-28-2012, 09:34 PM
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Quote:
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Quick question, is your antenna shaft insulated from the mount with a nylon washer? Thats the most common cause of high (>3) swr.
here is the pic of it
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Old 10-28-2012, 09:35 PM
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their is a washer on the top but not the bottom
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Old 10-28-2012, 09:40 PM   #7
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their is a washer on the top but not the bottom
Thats OK, as long as it is a screw on type (looks like it to me). Have you tuned the swr at all?
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Old 10-29-2012, 09:46 AM
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no i have not tuned it nor cut the antenna at all. i have been reading about this and it looks like i need to get a swr meter. or if someone already knows how long my antenna needs to be? i can cut it. right now it is 46-1/2 in long.
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Old 10-29-2012, 10:11 AM   #9
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You have an internal swr meter.

Set the channel to 20.
Set the S/RF-SWR-CAL switch to CAL.
On the meter look for the red arrow next to where it says CAL.
Key the MIC and adjust the SWR CAL knob to align the indicator with the arrow.
With the MIC keyed switch the S/RF-SWR-CAL switch to SWR and you want to read less than 3. The further to the left the better.

Do this and tell us what you find out.
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Old 10-29-2012, 10:13 AM
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ok thanks, i will do it tonight and let you know.
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Old 10-29-2012, 10:28 AM   #11
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Here to help.

Trons are my life.

Things to check:

1. Check your antenna connections for mis-aligned threads.
2. Check to make sure the pins in your connectors are not bent or loose.
3. Make sure the connections are tight.

If you still have bad VSWR we will chack some other things.
Do you have a Digital Volt Meter?
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Old 10-29-2012, 10:39 AM
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Yes i do have a volt meter, and i will also check all the connections tonight also.
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Old 10-29-2012, 10:47 AM   #13
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I would disconnect both ends of the cable and check the resistance. Pin to Pin should read 0-ohms and pin to shield should read infinity (Max ohms).

I found a video on YouTube that shows how to tune the SWR. Its poorly done but they do get the message across.
CB Antenna Tuning fiberglass Cobra 29 LTD SWR checking 4x4 toyota 4x4 - YouTube
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Old 10-29-2012, 10:53 AM   #14
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You do have a great radio. It's one the most popular sold. Do you have the MOS-FET upgrade? The upgrade bumps it up to about 35 Watts.
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Old 10-29-2012, 02:24 PM
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no i dont have that upgrade, how do i get it?
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Old 10-29-2012, 05:07 PM   #16
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Most parts are available through Radio Shack or any CB/HAM shack.

Here is a write-up (not mine) for doing the MOSFET upgrade to your transceiver. There is soldering involved; if you are not a seasoned solderer this is not the project to learn on. You will need to find a twidget near you. Any HAM guy would probably do it for you for a couple cold beverages just for the fun of it.(But don't give him the beer until he is done or you may be receiveing radio free saigon before he is done..

MOSFET Supertune (29LTD classic and newer):
Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing).
Remove R56 and in its place install a 470-ohm resistor in series with a common switching diode (1n914 or similar), with the banded end of the diode towards the front of the radio.
Remove C53 and solder it across C59.
In C53's place solder a 3.3k resistor.
Remove C61 and solder it across C62.
Remove C126.
Remove R55 and solder a 22pf cap in its place.
Remove the slug from L14.
Replace C71 with a 33-47uf cap.
Turn VR4 (AMC) counterclockwise fully.
Gently spread L13 and L12 and tweak the spreads for best PEP when modulated.
Tweak L20 and L17 for best PEP when modulated.
After tuning is finished, set VR4 to half-way.
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Old 10-29-2012, 05:58 PM   #17
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Quote:
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...Any HAM guy would probably do it for you for a couple cold beverages just for the fun of it....
Loose my license and get a multi-thousand $ fine? I'll pass.

Part 97 of the FCC states 4watt max for CB band, as well saying changing FCC approved devices is a violation.

Know what you are doing
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Old 10-29-2012, 06:03 PM
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o my god, way to much for me.. but thank you !
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Old 10-29-2012, 08:57 PM   #19
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Loose my license and get a multi-thousand $ fine? I'll pass.

Part 97 of the FCC states 4watt max for CB band, as well saying changing FCC approved devices is a violation.

Know what you are doing
Well, there is that...
Everything comes with a disclaimer.
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Old 10-29-2012, 08:58 PM   #20
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Did you get a chance to check your cable?
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Old 10-29-2012, 09:05 PM   #21
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Quote:
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Well, there is that...
Everything comes with a disclaimer.
Lmao, thats great man. I almost peed a lil I laughed so hard.

I'm with Mr Bill here (used to work with a feller I called that). You seem to have a short somewhere if you are getting 3+ swr, if not in the mount then in the coax. Test it for resistance as he said, you should be able to track it down that way.
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Old 10-30-2012, 06:08 PM
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ok, i checked my cable and it is in good shape. I also did

Set the channel to 20.
Set the S/RF-SWR-CAL switch to CAL.
On the meter look for the red arrow next to where it says CAL.
Key the MIC and adjust the SWR CAL knob to align the indicator with the arrow.
With the MIC keyed switch the S/RF-SWR-CAL switch to SWR and you want to read less than 3. The further to the left the better.

When i keyed the mike and SWR It will not go to the green at all enless i bring it down using the CAL knob. Also the red antenna light is still on.

mike
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Old 10-30-2012, 07:00 PM
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watching the video and doing what he did it looks like i need a much longer antenna? mine is 46in long... what is the norm for you guys?
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Old 10-30-2012, 07:02 PM   #24
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You need to take a swr reading on ch 1 then on ch 40. Then you will know if it is short or long.
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Old 10-30-2012, 07:42 PM   #25
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watching the video and doing what he did it looks like i need a much longer antenna? mine is 46in long... what is the norm for you guys?
No, you're antenna is about 108" long. It is wrapped around a 46" shaft. Every mounting location on every vehicle will have it's own length, though some may be consistently close.
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Old 10-30-2012, 08:05 PM
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i did the swr reading on 1 and 40, on one it was at the red arrow, on 40 it was just below the red arrow. never went to the green.
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Old 10-30-2012, 08:15 PM   #27
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Try adding a spring or a quick disconnect.
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Old 11-01-2012, 11:00 AM
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a spring? or quick disconnect? where?
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Old 11-01-2012, 12:45 PM   #29
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Between the mount and antenna.
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Old 11-01-2012, 01:44 PM   #30
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I would find a known good antenna and cable and see if you get a different results. Your VSWR is so bad I don't think it is just a matter of tuning the antenna.

What do you read if you remove the antenna and measure the resistance between the center pin on the antenna mount and ground? (With the CB off)

some more fact finding....
1. Is the system installed?
2. Is the CB chassis and the antenna grounded to the same source?
3. Did this CB/cable/antenna work and then stop working? or did they never work together?

If the CB, cable, and antenna worked before and now they don't I would still suspect the cable or connectors.


A spring may not be the answer but you should have one, it could save your antenna on the trail.
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