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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

Here's what a stock one should look like underneath

Here are a few files I have.

That's similar to what I have done to those a few times.

Here's a video on where to find the gears. I've done this a few times. The only thing I had to do was to open up the hole just a little in the one gear so it would slide over the shaft. I bought the timers from eBay for about $8.00 each.

I have been using a RS .64 for quite a few years. The coil was long gone in it when I got it, so I use the matching and beta rods from a P500 on it.

Here's a Radio Shack ad from 1978 that shows all their base antennas are called Crossbows. And another from 1972 that shows a 5 element Crossbow beam.

When the 40 channel radios came out in 1977 the P500 manual set the new length at 22' 6' to cover the higher frequencies allowed. Here is a copy of the 1981 manual.

They just need to be assembled like the original P500 to work properly on 11 meters, which is what you did there. Without an electrical connection through the matching rod from the coax to the antenna mast, there is no way it could work. Poor assembly on the part of the manufacturer, for sure.

Actually, the TRC449, 457,and 458 were only made in 1977 and 78. In 1979 the PD858 board was discontinued and the MB8719/MB8734 board was introduced. The TRC450 and 490 replaced the 449 and 458. There was no replacement for the 457.

Just connect a frequency counter to it, then run through the channels 1-40 on transmit to see what channels the switch gives you.

The schematic shows resistors 301-314 as 680 ohms. According to the manual parts list they are individual ones and not a couple of resistor networks. You may want to check these. If they are bad or too high in value the segments won't light.

Also, a sniffer probe is a good thing to have. It can be used to read a signal without direct contact. A direct connection can sometimes pull the signal down a bit and give you an incorrect frequency reading. If the sniffer probe it is insulated, you won't have to worry about touching something...

I doubt you will get a reply. His last post on this group was in Feb. 2012.

The Tram Titans like a few other DSBSC radios transmitted on both sidebands at the same time, so their output was divided between the two. Wasn't much better than AM.