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I can't locate D14 or D203 in my Uniden Pro 510XL, I did find D302

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Mechanic688
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SOURCE: modification of frequency output of uniden pro 510xl

deweyp, hi, if you are wanting to turn the power up some on the radio, do this; tune L4, L5, L6, L9 for
maximum RF forward output. There are 2 versions of the radio, and both are listed as 510xl. If you are wanting to expand the freq's or add channels, then no, there is no mod for that radio. If your going to tune the radio for more power, make sure you have a power meter to watch the output. It is preferable to tune into a dummy load so your not broadcasting over the air. You tune the radio for peak output, using a steady awwww sound in to the mic. Just be careful as that radio has a fairly small driver and final transistor. Don't want to let the factory smoke out of it,,,
Here is what the little variable adjustments are for and what they control;
VR1 Squelch
VR2 TX Meter
VR3 RX Meter
VR4 RX IF Gain
Hope this helps you out, let us know,, Mechanic

Posted on Feb 19, 2008

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1 Answer

Pro510xl schematic


do a search for it. uniden pro 510XL schematic. I found it.

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How to turn the wattage up on a uniden pro 510xl


why does everyone want to turn up the wattage. the most you can legally put out is 4 watts.leave it as is and get a small 100 watt linier amp and you will smoke em.

Dec 01, 2012 | Cobra Radio Communications

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On my uniden pro 510e I can transmit but I cant receive all I get back is static got any clues?


Hi,

Which radio are you referring to, the Pro 510e or the Pro 510xl?

In any event, to transmit and receive clearly depends on your antenna, it's location and it's surroundings and HEIGHT.

Radio waves on these radios depend mainly on line of sight and propagation factors, If you have an indoor antenna, that could be the problem, if it's an outdoor fixture, it needs to be in such a position so that the coax cable isn't being interfered with by another electrical fixture, the Height of the antenna, is most important, the higher, the better, taking in all these factors and a bit of try this and see approach should find a solution to your reception/transmition issues. That's part of the fun of setting up a base radio, experimentation, configuration and the results you want will be worth the effort.

I hope this has been helpful for you.

Cheers, Peter

Jan 29, 2012 | Uniden PRO510XL 40-Channels Base CB Radio

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I looking for sxematic diagram uniden pro 510xl


I hope you find the schematic diagram for your radio......

Aug 25, 2011 | Uniden PRO510XL 40-Channels Base CB Radio

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How to turn the power down uniden pro 520 xl


For this radio you adjust power through coils in the back of the radio. Using a watt meter and a plastic screw driver push coils L201 and L202 together and the power output will decrease. If D203 (modulation limiter) has been removed you can replace that as well. This should get you fixed up. Good luck.

Jan 10, 2011 | Uniden PRO520XL 40-Channels Base CB Radio

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I just have Uniden Por510XL (used) but don't know how to set the channel (programming) so it can match with my handheld radio (i use motorola GP2000)


well a GP2000 has a Frequency range of 136 - 174 MHz, 403-440 MHz or 435-480mhz
a uniden pro 510XL is a 27 mhz radio as far as i know...

Dec 09, 2010 | Uniden PRO510XL 40-Channels Base CB Radio

1 Answer

Uniden Pro 510xl can send but not receive


If you look on the solder side of board you shoud see a straight line of 5-7 solder joints, look on the other side the audio vhjp is a bmack thin retangular ic chip. Not to worry you wont hurt anything by doing this. Its an old cb tech trick to test audio chips.GOOD LUCK.

Oh one other thing does the radio have same same problem in either vehicle? A insulating washer on the antenna bracket can cause this also,
Happy New Year , Tom

Dec 30, 2008 | Uniden PRO510XL 40-Channels Base CB Radio

1 Answer

1987 uniden pro 510 xl


Wow, from what you are saying, you should not be messing with the insides of the radio. Finals, are not resistors, that are TRANSISTORS, and they do not have resistance values at all.

The final is the little black transistor attached to the heat sink at the back of the radio. You can't just change the final. there are other parts that need to be changed if you want to do a high power mod. Don't even mess with it. you don't need too.

Next, D14 is not the uniden model. thats what you mess with in a cobra. Don't cut d14 in that radio or you will prolly blow it up. The diode you want to cut out is D203. DON'T CUT IT!!, Just un solder one leg of the diode. You won't be over modulated. That will bring you modulation up and your peak watts. it will swing to maybe 15-20 watts peak. That alone with make the radio louder.

You really don't need to raise the dead key. With a lower dead key you have higher swing. Its all about the audio. 2 watts for dead key is fine. Thats what I run.

You cannot do any other peaking with out a meter. If you have a meter you can spread the 2 coils behind the large transformer a tiny bit until you have peak wattage. L201 and L202. but from reading what you said, you should probably leave them alone, you will gain only a watt or 2, and its not worth it if you mess it up.

To be honest with you, all you really need to do is unsolder one leg of D203. Make sure you pull the leg out, and make sure it is not touching anything so it will not short.

Now if you do this, and it splatters, you can always solder it back in, and then turn RT201 all the way to the right, I think. If you turn it all the way to the right, and there is not modulation, you just turn it all the way to the left.

Please don't mess with anything else or you will screw the radio up.

Mar 19, 2008 | Uniden PRO510XL 40-Channels Base CB Radio

6 Answers

Modification of frequency output of uniden pro 510xl


deweyp, hi, if you are wanting to turn the power up some on the radio, do this; tune L4, L5, L6, L9 for
maximum RF forward output. There are 2 versions of the radio, and both are listed as 510xl. If you are wanting to expand the freq's or add channels, then no, there is no mod for that radio. If your going to tune the radio for more power, make sure you have a power meter to watch the output. It is preferable to tune into a dummy load so your not broadcasting over the air. You tune the radio for peak output, using a steady awwww sound in to the mic. Just be careful as that radio has a fairly small driver and final transistor. Don't want to let the factory smoke out of it,,,
Here is what the little variable adjustments are for and what they control;
VR1 Squelch
VR2 TX Meter
VR3 RX Meter
VR4 RX IF Gain
Hope this helps you out, let us know,, Mechanic

Feb 19, 2008 | Uniden PRO510XL 40-Channels Base CB Radio

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