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Hi, I was asking about a schematic for a "black label" Palomar 225 a while back and was wondering if anybody was able to find it? I have one for blue label 225 & they def aren't the same! Thanks

So are you saying that it can't be used as a HF amp? What if the VHF transistors were swapped out for MRF455's (and a bunch of other parts, no doubt!)? Or am I screwed by the Chinese yet again? Lol

Thanks for your response. Do you know which parts are most likely bad then? Or how to go about repairing it?

I have a page 75 linear and am wondering if anyone can tell me anything about it? Preamp doesn't work but everything else seems to.

Thanks for all your help! I brought out my vintage Uniden pc68xl, put an adjustable swing mod in it .

Thanks for your response! I've seen a (foreign language) video on YouTube of a guy swapping an electrolytic cap for one of a different value (see pic w green scribbles), cutting a trace on PCB, removing a surface mount (400 ohm?) resistor, adding I think 2 15 ohm and a 75 ohm resistors (see...

I bought a $100 bj-300 linear(?) amp and attempted 1 time to hook it up and to put it mildly, it did not go well...AT ALL! I've never seen so much screeching feedback , high swr, ant warning lights going off at once! I'm surprised something didn't explode or at least burst into flames! Lol...

Thank you SO MUCH for your response! The information you provided is awesome and I can't wait to "dig in"! It'll be a week or so as I have a project ahead of this one, but I'll post how it came out Thanks again!

That's interesting. Thanks for your response. This one has a pair of MRF455's, do you suppose the ones you mentioned with the SRF3749's are better, or more powerful? I gave a hundred dollar bill for it, didn't even try to talk the guy down. Excited to get variable dead key installed on my radio...

Thanks for your response! Here's a few pictures (sorry, they are kinda crappy!) of the Uniden PC78XL circuit board, I'm currently running the Cobra 29 LTD NW in my car, I can probably post a picture of it in the next couple days...

Are there any good variable swing mod kits and/or tutorials for new style surface mount 29 LTD NW/PC78XL?

Thanks! I have no problem with pulling the PC board out and desoldering that cap! I want to clean the flux off it anyway and put fresh thermo paste on the power transistors.

I just picked up a blue label Palomar 225 with 2 455's (see pics). I am wondering if it's possible to eliminate the delay when keying it up, and when were these made, if they are "good" amps (better than black label 225's?), and how much they should actually put out with a proper "low dead key"?

Thanks for your responses! I have another question pertaining to this mod, and it is: What are the equivalents on the pc68xl to VR4 and L14 on a Cobra 29? Thanks again for all your help!

Ok, thanks. It helps a lot!

So JV17 (grn arrow) is the equivalent of J36 in the Cobras?

I'm very interested in the dk module you referred to on ebay, but the circuit board in the Uniden pc68xl is a little different than the Cobra 29. So, would the module work in the pc68xl, and where would I install it? What jumper, etc. Thanks!

I have an older Uniden PC68XL (made in Philippines, ser#95002515), and am wondering if there's any"swing mods" to adjust the dead key between 1 watt or less to max power for this radio, like there is for cobra 29's?

I re-checked radio only carrier and it was 3.8 watts...?

54 watts out on low...