President Madison homebase CB serial numbers

[cb4ever104]

Looks good. Thought these might have been made in Japan like similar Uniden radios of the time , but they must have moved production around this time. I have the later MB8719 President and Uniden badged versions.

[Videobyrb1]

These photos are of the back of the 10 pin connector, the inside of the connector and where the wires are connected to a board. Maybe someone modified for a frequency counter.
Any thoughts would be appreciated.

[cb4ever104]

I can't enlarge the photos to see the part numbers , but it looks as if it might be for a counter . Where does it connect to the main pcb ?

[Videobyrb1]

Here is a wider view of the inside, I can do better photos if I know what I need to share.

[cb4ever104]

Still can't see that . Anyway . As I said . Once you see where it's connected , then you'll figure out what it does .

Cheers

[Videobyrb1]

Since we can only post a 2mb photo per comment. I will try to do 3 from different angles and better resolutions to be seen easier. #1

[Videobyrb1]

Photo #2

[Videobyrb1]

Photo #3

[cb4ever104]

The 75492PC is a display driver , so I'd say yes , there was probably an external counter display connected to it via that cable . Also , you've got a coax cable coming in to that pcb , which is presumably coming from the VCO circuit . If it was mine , then I'd probably rip all that stuff out .

S.

[Videobyrb1]

Thank you so much for your help. Great suggestion about taking it out but for the moment I am going to leave it in the radio.

[Otter]

The 75492PC is a display driver , so I'd say yes , there was probably an external counter display connected to it via that cable . Also , you've got a coax cable coming in to that pcb , which is presumably coming from the VCO circuit . If it was mine , then I'd probably rip all that stuff out .
S.

I wouldn't touch it tbh. The MM55110 is a PLL chip, and that radio needs at least one of them.

[cb4ever104]

The MM55110 is a PLL chip, and that radio needs at least one of them.

I saw that too , but I'd still rip it all out . Let it run with the uPD858 and buy a Maurer module for it . Just my 2c .