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We are refurbing and upgrading an existing system....Need a UHF Transmit and receive MT4 and a 16 channel controller MT4? New or otherwise just needs to be working.

Let me know please Fire season is coming and would like this project to be complete/

I'm not sure that I understand your reference to the 16 channel controller. Do you just need to be able to change the channels on a pair of MT4 transmit and receive modules?? If so, you can use the AC-3E audio module and add the channel switches.? You can use two switches if you want to select the transmit and receive channels independently or one if you want to gang them in pairs.? As I recall, Daniels used Grayhill 16 position BCD rotary switches.

It doesn't matter whether you are routing analog audio through the AC-3E or using the RJ-45 jacks on the MT4 front panel.

Hope this helps.

KE6CD

Thanks for the information The AC 3e looks like the way to go the way to go

If you are upgrading an existing MT-3 system, there are a few potential quirks you may encounter.

In MT-3 systems, there are typically one or more PL tone boards in the AC-3e.? This is not needed with the MT-4 as the tones are programmed in the RSS. Conflicts can occur if PL is active in both the MT-4 and the AC-3e, so you may want to remove or disable now unneeded the tone boards. This may be particularly important to avoid operator error depending upon who is using the repeater.

In MT-4e systems where the RX and TX modules are connected via the RJ-45 jacks, the receiver will not boot properly unless the transmitter is powered up.? Powering up both modules simultaneously also works.

MT-4e systems can use normal shielded Cat 5 or 6 RJ-45 cables to connect modules.? The earlier MT-4R or 4D modules must use six conductor cables because the outer two pins are used for programming. The cables Codan sells are six conductors and will work with either version but you can fabricate your own.

If I recall correctly, the BCD switch Codan/Daniels used for channel selection in the AC-3e,? CI-BC-4E, and CI-RC-4L is from the Grayhill 26AS22-01-1-16 series.? In order to get a more exact part number, I would need to pull and open a module. Perhaps I can do this by the weekend but no promises.

It appears that NOS versions of this switch -- that should work fine -- can be found on eBay for about $15 to $20, including shipping.? The usual places, such a Mouser and Digikey also carry these switches. You only need modest soldering skills to add the necessary leads, although switches with leads attached seem to be available on eBay for about $40.? When buying surplus switches, be sure that you get regular BCD encoding instead compliment or Gray encoding.

Codan may offer a kit that includes the switch with leads attached and perhaps a matching knob.? However, that is a more expensive option.?

KE6CD