Question about Cobra 19 Ultra II CB Radio

2 Answers

How do i turn peak and tune my cobra 19 ultra 3 myself no cb shop close by

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Un-solder 1 leg of D11 diode, pull it out of the board, and make sure it does not short against anything.

That will bring your modulation up all the way. there are other adjustments that can be done, but without proper meters, you will most likely mess up the radio.

D11 will be a big step up any way.

Posted on Oct 03, 2009

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I am not up todate on the Ultra II but most 19
are almost the same,on the Plus model adj.
RV501 some will have RV4 they are for
modulation,the plain 19 adj.VR501 the Classic
is VR4 so you see how much alike they are
100% modulation is all you can do to be in the
limit but I have seen 125% to150% out of some
Maybe this will get you started,

Posted on Sep 09, 2009

  • Mark Downey Sep 15, 2009

    Try VR501 or RV4 to adj. modulation

    Maybe this will help.

  • Mark Downey Sep 17, 2009

    My schematic go back to far,Iwill dive you one

    on a 19 ultra maybe thay are close to the sane

    for Modulaiion RV501 or cut D502

    for AM power L306 an L305.Maybe this wlll

    help,good luck

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A lot of people will say that you need to peak and tune the radio to get more range. And it will, but what it really comes down to is your antenna system.

Even with the best peak and tune, if you don't have a good antenna system, it won't do you any good.

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See here. Hope this helps you.

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I can not get out on my cb i can hear them but they can not hear me its a cobra


turn the mic gain all the way up. Make sure the antenna has been tuned for best SWR.

Take your radio to a CB shop and have them peak and tune it.

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How to increse the watts?


Take your radio to a CB Shop and have them 'tune it up' or 'peak' it. It is usually a modest fee and will improve the transmit range of the radio. There are usually shops near truck stops, just ask around on channel 19 in the area if there is a shop nearby.

Some radios do better than others, there may not be a great improvement on your particular radio.

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