one for the radio hams??? 40 way CB channel switch pinout

[Gazz]

I have taken the 40 way channel selector switch out of an old CB radio, and want to see if i can figure out how it works, with a view of using it on my computer (i need 10 switch detents over a 90 degree arc for a control lever, hence the 40 switch detents over 360 degrees of the CB switch gives me what i want when i use a quarter of a turn on it)

The switch is made by uniden, and has the following markings on it... SR-334, P-79 2-5A, they are stamped in, the UNIDEN word is cast in the back plate as well as 'PSS-23'

i apeers to be made up of 4 x wafers, each individual wafer has 5 pins, and they are stacked front to back, i.e. there's room for 6 pins, but one is missing giving 2 space 3 pins, then the next wafer is 3 space 2 pins and repeat.

that gives a total of 20 pins,

i'm going to play with the multimeter on it, but wondered if anyone knew how they work internaly,

i need to make it work like a 2 bit gray scale rotary encoder, know how to do that with a single pole rotary switch where there's an obvious 1 common pin and the switched pins (uses a few diodes to give the A, B, AB, 0, A, B AB etc output) but can i do that with this switch?

[Ian Jackson]

In message , Gazz writes

In the 1980s, I modified a few UK CB sets for use at the top end of the amateur 10m band. Most designs used a limited variety of dedicated synthesiser ICs - the LC7317 being a typical example (the intention being to make it difficult to move them off the original CB frequencies), and the channel was selected by a binary coded decimal address. The channel selection switch was designed to provide the appropriate address directly. However, I don't really have any immediate access to any further useful information.

[The Natural Philosopher]

Fairly sure that there are logic chips to turn the sorts of outputs that might give to whatever you want. Or use a PIC/ATMEL etc and a few lines of code..

[tony sayer]

In article , Gazz scribeth thus

I rather doubt that you can use that as a 1 pole 10 way switch as such its likely to be sort of BCD coded .. and feed a synth chip...

Probably best to sit down for a while with a meter and work it out;!..

[Gazz]

that makes sense, the switch's pins went via a 10 or so way ribbon cable to the channel ic, terminology lets me down here... but the chip at the front of the pcb that you soldered another on ontop of, with one pin left off going to a switch... usually the output power switch, to give 80 channels,

but i havent done any playing with cb's for about 15 years, and all i did was follow instructions for things like the 'cept' channel add ons, replace output trannies, and faff about with echo chambers and multi tone roger bleeps,

[Ian Jackson]

In message , tony sayer writes

If the OP still has the CB set, he could have a look and see what the synthesiser is, then have a look at its data sheet. That might assist in finding out what code BCD codes are in each switch position.