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The best thing to do with that radio is to take the bottom board out. About a dozen screws and four wires to unsolder. That's the board with the large cap that always seems to leak and destroys the traces. It's much easier to work on then, instead of constantly flipping that heavy radio over and...

You don't tune electronics unless you have a piece such as a radio with a VFO and you are tuning in stations. Cars and musical instruments are tuned. Electronic devices are aligned.

Here is a video showing the number for the timer to get the gears from. I have done this in the past, and the last timer I bought about 7 years ago cost me $7.95 from eBay. Just remember the clock runs on 120vac, so when the radio is plugged in the clock has 120v to it.

That's one of the earliest original hy-gain Penetrator 500s from the early 1970s. They had 3 section ground radials that were held to the mounting plate with 2 bolts, and the clamps had a bolt that went through the clamp instead of through the ends of the clamp. The later hy-gains used the later...

It was in 1976 when they came out with a lot of new rules for the 1977 models of CB radios. They let them have 40 channels, but limited output to 4 watts AM, 12 watts PEP for SSB, and only your voice could be transmitted. No roger beeps, music or any "noise toys". That's why Browning couldn't...

No it's not. That was so, if the radio was used as a mobile with a positive ground, it would function properly. If used solely as a base, the board and the chassis ground can be connected together.

Here are a few other things I have for these. I also have more for other CPI products along with some advertising.

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All that's true to a point, but that won't always get people good jobs that pay well with good benefits. In my 43-year career, I worked for three corporations that were always designing and building equipment with the latest technology available to be competitive and stay at the top in their...

Nothing wrong with N.O.S. It's new old stock. Or new original stock. Some don't understand what it is and will call it N.O.S. even though it's not. Many Chinese sellers will call it N.O.S. so beware! Items such as transistors, ICs, diodes, transformers, chokes, non-carbon composition resistors...

The words tech and engineer get thrown around on these internet groups all the time. It seems like anyone that does anything to a piece of electronics is suddenly an engineer or tech. Real techs and engineers have a paper to prove they are educated and trained in electronics, just like in any...

I got my CDL back in the late 70's and you could operate any transmission. When did they change that rule?

AM transmit frequency is adjusted in AM mode. Try using this. The SAMS book states to connect a frequency counter to the antenna jack with radio on channel 1 AM transmit and adjust VR9 to 26.965 MHz. Makes sense right? If I remember correctly, the AM crystal only sets the AM receive. The USB...

I'm not tramdr, I'm tramd. I've used that "handle" for almost 30 years out here on the internet. tramdr came along much later. He used to be the Undertaker, not to be confused with the Undertaker here on this site. People always think I'm him, or he is me. I actually don't live far from you...

There is one on eBay for sale. I just saw it a few minutes ago.

There are two different boards for the D201A 40 channel radio. They both are marked 17029-A. The early one has L203 on the far right-hand side of it. The second version doesn't have L203, but has a transistor with some caps and resistor changes. Also, 14.4 VDC was added to pin 2 of the chassis...

Must be a lot of youngsters in here if they didn't know the internet didn't exist publicly back then.

The D300 has the Uniden single conversion PC-385 board like the Cobra 140GTL/142GTL, Uniden Washington, Realistic TRC490/TRC450, Robyn SB505D and a few other brands. The Cobra 2000,148GTL, newer President and Uniden Grants, and newer Madison have the Uniden dual conversion PC-497 board.

Here are the schematics for versions A, C1, C2, D, E, and H. The version is on the paper tag on the back of the radio. It will read 223 then the letter of the version like in the pic below.

Here is the schematic you need. The potentiometer that you are missing (R69) is part of the ALC circuit that the 1974 and later transmitters had. Also, the instructions you need are here on this site under: CB Radio Modifications