Question about Uniden Bearcat Pro PC68XL 40-Channels Base CB Radio

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ONLY 2 WATTS DEAD KEY AFTER BEING PEEKED/TUNED AND MOD KIT.

AFTER BEING PEEKED /TUNED AND MOD KIT, DEAD KEY WAS ABOUT 5 WATTS SWINGING OFF THE METER WHILE MODULATING. NOW IT ONLY SHOWS ABOUT TWO WATTS DEADKEY WITH LESS SWING ON THE METER.

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Has anything changed with your antenna or your power supply ? The only real way to get an accurate reading is to check it with a dummy load and form a base line from there.Good Luck

Posted on May 23, 2009

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It sound that a can has been set of balance, or the output  transister has crashed. did you up grade the output before ajusting for more output.

Posted on May 22, 2009

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1 Answer

Galaxy saturn tubro 100 watt power is sticking after key up.


Not sure what you mean completely. If you mean, when you key up, it keys at 100 watts and stays, then this is probably not a problem.

If it doesn't swing, it is either the watt meter you are using, or you have the power up too high, or both.

I usually key my saturn turbo around 80 watts. You have to be careful with these radios. they get hot fast and when they do, they get whacky. Make sure you have a PC fan plowing on the heat sink on the back.

The higher the dead key, the less swing you will see.

Now as for the watt meter....

There are a few types of meters out there. The 2 most common are ones that read AVG, or average watts, or PEP or Peak envelope power, which in short terms is your Peak wattage. Some meters do both.

An AVG meter will not read peak wattage, or swing. So if you meter is an AVG meter, or is set to AVG, then it will not read swing, and will show you your dead key, and that's it. Some times the needle will move a little, but it is not showing your true swing.

All in all a PEP meter is a loose representation any way, because you really cannot get an accurate reading when there is modulation. But it's close enough. You would need a spectrum analyzer to really see what you are putting out with modulation. AVG with no modulation is a more accurate reading however you cannot see swing.

Now PEP while transmitting in SSB with modulation, would be accurate. Just not AM, but like I said, its close enough and is what every one goes by.

I don't know if your Saturn turbo has been modded or peaked and tuned but, you should see a max of about 170 to 200 watts swing on that radio if its been done right. But you will need a PEP reading meter to see that.

I wouldn't run it past 80 watt dead key for long. With that radio you should really only run what you need. For instance, when I am using mine, I start at around 70--80 watts, and do a check, and if it's not strong enough I bring it up a little, until the audio sounds good to who I am talking too.

Like I said, you have to keep it from getting too hot.

Nov 04, 2010 | Radio Communications

1 Answer

Cobra 29 modulation modification


did you make sure the caps stripe is facing the back of the radio? If not, its the wrong way.

Also, don't use a 1/4 watt resistor because it will get too hot for it to last. use 1/8th.

changing the cap size will not change output, however it will change the tone. Bigger the cap, the deeper the tone of audio.

to be honest with you, high output mods are worthless in these radios. they are fine with out them. mosfets are unstable and are very dirty transmit finals. As well if you are planning to use a linear you may hit it too hard unless its a high drive, in which case you will need more then 35 watts swing to drive it fully. A stock cobra 29 that has been peaked and tuned, then the swing mod put in, 220uf e cap and 100 ohm resistor, which should give you about 2 watts, should swing to about 27 watts, and kick an amp in the pants.

I run a cobra 29 in my blazer with a dave made 5 pill, and I key on 6 pills and I near keyed on a 2x8. very close. All that I have done to the radio is peak and tune, (of course I have a few tricks with that up my sleave which I don't usually share with just any one.) and variable power, wich will control the dead key, which is basically a varible swing kit. I run it just under 2 watts, just enoug to get a 125 watt dead key out of the amp. The amps swings over 920 watts.

any more swing from the radio will beat up the pills in the amp.

Jan 06, 2010 | Cobra 29 LTD CB Radio

3 Answers

Wat power does this radio push


Generally All CB Radios will only push 4 watts. This is only if you have a SWR of 1:1

Jul 11, 2009 | Magnum S9 Base CB Radio

1 Answer

Tunring up a cobra 150 gtl/dx


Um... What?? This is hooked to a switch? CB radio by FCC regulations is only supposed to have a max of 4 watts total output. If you can flip it to 7 watts dead key, you are doing really good. It won't do much more then that. It sounds like its set up to run on a linear amplifier, which cannot have more then 3 watts dead key transmitting into it.

Dead key, and modulation are different. You may have a meter that only reads dead key, and won't see the modulation. This radio is probably swinging close to 15-20 watts. you need a meter that can read PEP, Peak envelope power. Cheap meters only read AVG, or average power, witch will only show your dead key.

7 watts dead key is really good for that radio.especially since stock only has 4 watts. you cannot get any higher then that without changing finals.

at 3 watt dead key, or 7 watt dead key, your modulation wattage is still swinging much higher.

Also, you will get more swing with a lower dead key any way, which is better if you want it to be loud.

Leave it alone. its probably set just right.

May 12, 2009 | Cobra 150 GTL DX Base CB Radio

2 Answers

Cobra 29 ltd classic ant light


Your SWR is probably NOT fine. You need to use an external meter if you have had work done to the radio. Especially if you have had a swing mod done to the radio. When you do this, the dead key of the radio is lower then the calibration knob on the radio can adjust for. It will always come up lower then it actually is.

Your radio might have been fine before the work was done on it because it was putting out very little power. Now you are most likely putting out 50 watts or more. Big jump from 4 watts.

When your raise the power in a radio, you will notice more when the antenna is not properly tuned.

In most cases with a stock CB, even when the antenna is not even near tuned, you will get a reading less then 1.5 anyway.

the more power you put out, the more important it is to have a good match.

But an external SWR meter, and check it. be careful if the ANT light is on.

You might also want to check your coax, connections to it, and your antenna for anything wrong.

Apr 22, 2009 | Cobra 29 LTD CB Radio

1 Answer

Low output power


On the meter you are using, does it mesure Average power or peak envelope power?

This is very important to know when you are measuring.

AVG measures basically your dead key. It usually will very little if at all.

PEP measures your peak output, or swing. Modulation.

So even if you have a radio that has been peaked, on a meter that reads AVG, it will still read around 3 to 4 watts. And, if it has a swing kit in it, it will read even less. A swing kit lowers the dead key it increase modulation. Higher PEP.

For example. I peaked my cobra 29 and it does some where around 22 -25 watts PEP. I have variable power in it as well, but usually run the dead key at 2 watts because I have a linear. The Radio alone, when mesureing on PEP with key up at 2 watts, and then when you talk, swings to about 22 -25 watts.

If I flip the meter to AVG, it stays at 2 watts even with talking.

If you have one of those cheap pyramid meters, etc, they usually only read AVG.

Get a meter from radioshack. They have a fairly decent radio for the money. It reads both PEP and AVG and has SWR as well.

If the radio has been peaked and it has a swing mod, it will most likely be swinging to some where in the 20 watt range.

On a side note. According to FCC regulations, a CB radio is only allowed to transmit with 4 watts of final power. Most times the manufacturer will have it a hair under so that they are leagal.

Basically it is illegal to use a CB that puts out more then 4 Watts.

But its a free for all these days. There is no more funding to the FCC for monitoring CB radio, so they do not want anything to do with it. As long as you don't over do it, have over 50000 watts and terrorize a small community with RF, you can do what you want.

Now a days most cb radio's bought have already been peaked if you got it from a cb shop, or off a website that does it.

Apr 21, 2009 | Cobra 148 GTL 120-Channels Base CB Radio

1 Answer

Modulation with my linear


the radio you are trying to fry your amp with is driving the amp to hard. that radio has a toshiba 80 watt final inside the radio you are killing your radio with the dead key at 2 watts it causes the final to overheat and shut down because it is not built to be turned down that much. its best to turn the radio back up and use the radio.

Mar 07, 2009 | Cobra 29 WX NW ST 40-Channels Base CB...

1 Answer

Cobra 29 wx st


Take it back to your 'pro'. Let him fix it.

Jun 22, 2008 | Cobra 29 WX NW ST 40-Channels Base CB...

1 Answer

Question about my cobra 200


no need to increase power output. you can take a radio with 100 watts and a radio with 10 watts that had had a modulation kit installed and the 10 watt radio will out talk the 100 watt radio ALL day long. the best thing to do would to put a mod kit in it and have the dead key cut back to 1/2 watt then put as little amp behind it. with those mods it will be loud and clear. hope that helps

Dec 30, 2007 | Cobra 200 GTL DX 4-Channels Base CB Radio

2 Answers

Uniden pc68xl


Since this is illegal to do I can't instruct on this matter, but you might do a search on cb sam website. good luck
Ed
NC Electronic
Mills, Wyoming

Nov 08, 2007 | Uniden PC68XL (40 Channels) 2-Way Radio

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