Question about Uniden PC68XL (40 Channels) 2-Way Radio

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Best modulation for PC68XL - Uniden PC68XL (40 Channels) 2-Way Radio

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Most Cobra / Unidens are easy by clipping D9. On this one D9 and L19. Just turn up L19 to top. Clip D9 diode. spread coils 1/16" inch. Also use 100uf capacitor (-) toward final across JUMPER staple near Final Transistor in back. Use meter(adjust to best swing) spread back coils,remove L10,L20 slugs or adjust them to top. The only radio that clips different than D9 is Cobra 29Ltd (D11) or Uniden pro510xl(D14).

Posted on Mar 31, 2011

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Posted on Jan 02, 2017

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SOURCE: 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
NC Electronic
Mills, Wyoming

Posted on Jan 06, 2008

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How to turn up modulation on uniden PRO 510xl? I noticed it has tuneable vr4, I used vr4 to turn up the modulation on my cobra 29 ltd bt but are they the same on all cb radios?

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.

Oct 18, 2013 | Uniden Bearcat Pro PC68XL CB Radio

1 Answer

How do you calibrate a uniden pc68xl which has a built in swr meter but no calibration button?

That is not a built in SWR meter. The meter on that unit only measures S which is signal strength and relative transmit power.

Sep 04, 2013 | Uniden Bearcat Pro PC68XL CB Radio

1 Answer

I can,t get any modulation on my uniden pc68xl cb

you shouldn't be able to hear your modulation anyway,unless you have talkback. If you can't hear to well get a mono set of head phones or turn your radio volume up.

Mar 20, 2013 | Uniden Radio Communications

1 Answer

No modulation

I think you will find the Finals are blown in this radio.

usually caused by a bad antenna or a problem with the coaxial cable.

May 26, 2010 | Uniden Bearcat Pro PC68XL 40-Channels Base...

1 Answer

Need help in trying to boost mod/wattage on pc68xl dont have cash to take to radio shop and also add talk back. someone needed my conex more than i did use my radio everyday thank-you for your knowledge in...

Hi and welcome to FixYa,

Not much DIY (do-it-yourself) modifications on a Uniden Bearcat Pro PC68XL  Some that could be tried:
  • VR5 - adjust for max / best modulation;
  • L8, L9 & L10 - change coil spacing for maximum carrier output.
Good luck and thank you for asking FixYa.

Aug 01, 2009 | Uniden Radio Communications

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
NC Electronic
Mills, Wyoming

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

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