Linear Question

Discussion in 'CB Radio Forum' started by CloudNine, Jan 31, 2015.

  1. CloudNine

    CloudNine Bobtail Member

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    Jan 24, 2015
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    I have checked it with a swr meter with the amp both on and off and it's been below 1.5 that's why I asked if its normal that it comes on only when the amp is on. There are no cb shops in my area unfortunately that's why I'm asking so many questions here lol.
     
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  3. WisconsinF150

    WisconsinF150 Light Load Member

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    Dec 21, 2014
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    I'm a ham operator, I've never been able to do that above 20 meters (14 MHZ) and it's even hard that low. 40 meters (7 MHZ) works well all night and day long. 40 meters is probably what most hams prefer.

    All radio literature that I've read also says the same thing.

    If you are getting skip during the night, above 20 meters (14MHZ), you've got something good going there.

    You should get a video of it, showing that it's dark outside, and put it on youtube. You'll get tons of hits. You'll also get tons of hams saying it's impossible. But who cares what they say. Make sure you sign up in such a way that you get paid for all the views you have on that video.
     
  4. CloudNine

    CloudNine Bobtail Member

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    Jan 24, 2015
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    Will turning up vr4 modulation pot help me out at all? Just watched a couple YouTube vids of people doing it to their cobra 29 lx.
     
  5. WisconsinF150

    WisconsinF150 Light Load Member

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    Dec 21, 2014
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    I don't know. JesseJamesDallas sounds like he's a lot more technical than me. Hopefully he'll respond with an answer.

    You could also buy this book:

    http://www.cbcintl.com/

    Jump over the counter of most of these cb repair shops and you'll probably see a copy of the C.B. repair manual :

    The Screwdriver Experts Guide to CB repair and Modifications.

    http://www.cbcintl.com/



    [​IMG]

    Click on pic to see larger view.

    Or find a cb radio forum and ask around.
     
  6. mike5511

    mike5511 Road Train Member

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    Don't mess with your radio unless you really know what you are doing is my advice, but it's yours so do whatever you want. The extra power coming out of the amp when it is on can cause all kinds of weird things to happen. If your SWR is O.K. with the amp in line when it is off, it will be fine when it is on, in my opinion. I wouldn't worry about it. I've seen that happen many times.
     
  7. jessejamesdallas

    jessejamesdallas Road Train Member

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    VR4 is just your modulation adjustment pod, all that will do is max-out your modulation making you sound a little louder, but at the same time can cause you to sound garbled up or splatter. Not really pessary to max out when running a Amp, because it can make you sound over-modulated.

    What you may try is lowering your DK. Your Cobra 29LX probably has a 3 - 3 1/2 watt DK from the factory, so if you can get it down to 2w's, that will probably take care of your warning light issue, plus it will be easier on the Amp not driving it so hard.
     
  8. CloudNine

    CloudNine Bobtail Member

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    Jan 24, 2015
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    Ok how can I do that with my cobra 29 lx? Is there a pot I can adjust I have a swr/watt meter ifu knew what pot to adjust. Like I have stated before there's no cb shop on my area so if I could do it that would be great not really wanting to have to send it away if I don't have to.
     
  9. jessejamesdallas

    jessejamesdallas Road Train Member

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    On some radios there's a pod you can adjust to lower the DK, but I think on all the Cobra's you have to install a resister...I could be wrong on the 29lx, but I think that's still the case with them too...You might be able to find more info on this if you look on cbtricks.com ... Or you can join their Forum and in the "Cobra section" look and see if anyone else has asked this question, or make a new post and see what the experts say! http://www.cbtricks.com/forum/index.php
     
    mike5511 Thanks this.
  10. jessejamesdallas

    jessejamesdallas Road Train Member

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    Like I said...I talk on 11 Meter all the time after dark....Not that unusual at all. This videogate is from tonight after dark...This was from around 6:30PM, I have a couple more from after 7pm and one gate on 38lsb around 7:30pm to Australia which I will post up soon as it gets threw downloading to youtube.....enjoy
    [video=youtube_share;r9A2YNTAKV0]http://youtu.be/r9A2YNTAKV0[/video]
     
    WisconsinF150 and mike5511 Thank this.
  11. mike5511

    mike5511 Road Train Member

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    What antenna are you talking on in the above video JesseJamesDallas?
     
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