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

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Uniden pc68xl how to install modulation swing kit on uniden pc68xl or how to improve more amps on the radio

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Re: uniden pc68xl

This is no solution but rather a suggestion,I bought a PC68XL from a for 68.00 total with a mosfet swing kit installed,I was able to contact the seller before I got the radio ...what i asked him was what was the radio going to dead key in turn he told me some rididculous amount like 5 watts swinging to 25 ... I told him I wanted the radio to dead key one watt and swing to whatever it went to(it ended up at 3/4 swinging to 7),I have a small amp 2 mrf455's this setup does key the amp and has my 90 watts swinging from about 18 to the 90... I do use a power mic actually 2 different ones both sound great (a 575-M6 and the newer model of the Minuteman) when you keep the mic gain on the radio at about halfway up and the mics just cracked open enough to see your meter at 100% otherwise they will squeal ... I use a Wilson 5000 with a flat swr... I do get my head beat in talking skip but I do talk(on a daily basis) on Channel 11 mostly and do get an honorable mention on channel 6 from time to time ... talked to Manchester, England just the other day on 11 so this set up works for a grand total of about 250.00 bucks. Moral of the story is you do not need to pump up the wattage on these radio's.

Posted on Mar 03, 2012

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Re: 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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Can i connect a Uniden UH089NB UHF 2way radio to 12 & 24v

Hi John,

Page 5 of the manual for this radio specifies a 13.8 VDC (12VDC car / truck electrical system) power supply to power the radio.

Connecting to a 24 VDC system will damage the radio and likely require expensive repair or replacement.

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I am new to the world of cb radio and was very excited when I bought a uniden pc68xl for thirty bucks. I installed I have the ground and the positive post on my battery I've got a ten foot coaxial cable nd...

hi first of all buying a radio for $30 rings alarm bells ! your 1ft antenna will definitely not work on cb band maybe vhf but not cb band ,secondly the solution to your problem is this Match the antenna to your rig you can purchase a fairly cheap or expencive antenna that is entirely up to you but i recommend the Wilson 1000 for mobile use you will also need to purchase a swr /power metre if you are unsure of these items get a friend or someone that knows how to install them properly .My opinion is that you have bought a faulty rig but you can try it with someone whom has a proper matching antenna this will rule out radio problem if not then you may have to get it repaired by a quilified tech.. hope you get it sorted all the best EI5GLB 73

Apr 11, 2011 | Uniden PC68XL (40 Channels) 2-Way Radio

1 Answer

Uniden grant lt transmit and receives normally but when i key up on AM the AM power regulator gets hot quick i changed out the driver and final and replaced the regulator still does the same thing and it...

Sounds like a "short" if it affects modulation + power. Try to inspect board with magnifier for solder bridges, and bad resistors. Change a few resistors near back with new ones. take out slugs near back finals like L10 or L20's not sure if its same as Uniden Pc68xl. but try that. I found turning L19 up to top gave great Modulation. clip D9, Sread coils 1/16 inch in back. Try to get lower carrier. Carrier does not mean anything much. Modulation is what you need. With less Carrier it may cool down that chip. It may be too wound out.

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Best modulation for PC68XL

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).

Oct 08, 2010 | Uniden PC68XL (40 Channels) 2-Way Radio

1 Answer

Blows fuse when you plug power in, it is not

Make sure you're connecting the radio with the proper polarity. There is a protection diode inside that will cause the power supply fuse to blow or go into overcurrent shutdown if you have + and - reversed. It's also possible this diode has been shorted. You can't tell by looking at electronic components (unless they are physically damaged) whether they are good. An ohmmeter can be used to test for shorted diodes. Look at the board where the power leads connect for the diode.

Mar 12, 2010 | Uniden PC68XL (40 Channels) 2-Way Radio

1 Answer

Uniden pc68xl does not tx or rx. all lights comes on. I have no schematics to work with.

Try to change a 1k resistor R6(I believe) near back of radio. If not, try to change Final. Maybe small transistors near center back to back of radio. If you're not experienced take it to a Radio shop. Sorry i don't have much on this problem.

Jan 05, 2010 | Uniden PC68XL (40 Channels) 2-Way Radio

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If the stations are just "gone" chances are that they've moved to digital and/or trunked systems. Without knowing your exact location and the frequencies/services that you "lost" a more specific answer isn't possible. But yes, technology is changing and a lot of metropolitan area services are moving to improve the reliability and security of their communications.

Bill B.
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Try moving your antennas further apart. If they are already a couple feet apart, mount the Uniden in another location away from the stereo if possible. You might check with a radio shop about a filter. Your Uniden operates in the 150MHz range and the stereo receives in the 88-107MHz range. Good Luck.

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Uniden GMR-1035 2-way radion, with advertised 10 mile range

The range estimates are inflated by every manufacturer I am familiar with.
Even with line-of-sight transmission, I have found none that meet the claimed distance under common circumstances.

If you have a friend who is a radio amatuer, you might let him crack the case on one to see if there are any adjustments that could be improved; an 'old dog' would be able to locate the right area in which to look and perhaps tweak something to improve either transmitted power (he should have an instrument that would monitor it for adujstment if not for actual measurement) or improve receiver sensitivity.

The factory is only concerned with function and cost, not performance.

That the Motorola meets its stated range doesn't surprise me; they were long one of the most ethical companies around.
I'm not sure of their honesty today since profit (or even survival) has become more important.

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