Question about Uniden PRO510XL 40-Channels Base CB Radio

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I have a Uniden Pro 510xl, it's about 9 yrs old. I went to use it last week and after turning it on, found that there was no sound, (turned the squelch up) . When I keyed the mic, I saw that I was transmitting, but again no sound. Know nothing about radios, any suggestions.....

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Chk mic, lose cable in **** plug test with other mic .. also test with Ext speaker.. do u get any reading on meter / LED display during RX? does PA work? otherwise your sound chip is dead

Posted on Jan 04, 2011

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How do you turn down the modulation on a uniden pro510xl?


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No they are different. the pro 510 doesn't have a variable like the 29.
just trace the audio wire back to the audio transformer there should be a transistor on that section. best is to change the value of the resistors controling it to increase modulation.. if you take it out.. it will be wide open.. and can cause issues like splattering on adjacent channels. same goes for cutting the audio limiting diode, will cause the same issues. leave the parts in the circuits just change the values to achieve 100% modulation on a scope or wattmeter with a modulation function.

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I looking for sxematic diagram uniden pro 510xl


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

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1 Answer

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)


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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,
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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;
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Hope this helps you out, let us know,, Mechanic

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

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