MCS2000 COR pin

[tazmadman]

hi im trying to build a repeater using 2 mcs2000 radios but im unsure where the COR pin is in the acc plug
can anyone help me out please

 

[N1GTL]

Check www.repeater-builder.com

I think the pinout is the same as a CDM but double check.

 

[tazmadman]

I think the CDM has a different connector the mcs2000 has the d25 connector same as a printer port

 

[a417]

you will have to program an IO pin (I used pin 8 IIRC) for CAR RADIO MUTE, which should pull that pin to ground and gives you essentially a COR signal.

 

[mmckenna]

I think the CDM has a different connector the mcs2000 has the d25 connector same as a printer port

Yes, it does. CDM's use a 20 pin variant of the standard 16 pin Motorola connectors.
The MCS2000 uses a DB-25.
Another good source of info: GM900/MC900/GM1100/GM1200/GM2000/MCX1200/MCS2000/MCX2000/MC2100

 

[Firebuff880]

According to the JPS Interoperability Solutions - ACU Connection Template Pin 8 (IO_5) is COR but has to be enabled in the programming --

 

[cmdrwill]

And you would want that COR to be AND Squelch. Tone AND carrier squelch.

 

[tazmadman]

Thanks guys for your help

 

[tazmadman]

ok i have a problem when i transmit to it both radios lock on transmit and to stop i have to turn the power off to them
i enabled the car radio mute but i cannot find COR to be AND Squelch. Tone AND carrier squelch in the programming software
i have the radios wired
10 ground to 10 ground
21 ptt to pin 8
11 spk to 23 mic
does this look right thanks for everyone help

 

[a417]

Are pins 4-9 jumpered to prevent emergency activation?

Configuration --> Radio Wide --> Advanced --> AM/FM and Carrier Detect Operation --> 0 (selects the amount of time that the vehicle's stereo waits muted once a voice communication (TX or RX) has concluded. This extra mute period ensures that the stereo will NOT unmute in the middle of a radio conversation) - from helpfile

Conventional Personality --> RX Options --> Mute/Unmute Type --> And Unmuting,Or Muting (To unmute on Proper PL code detection AND Carrier Squelch detect, and to mute on loss of proper PL code OR loss of Carrier Squelch detect) - from helpfile.


just a couple of things to check, as well as verifying that your TX / RX radios aren't creating a loop - make sure your programming of the personalities is good.

 

[a417]

(duh - forgot)

is this a bidirectional system you're trying to build by just putting two radios back to back, or is this a 1 way?

pin 8 will go low on both TX AND RX on the MCS (as it is designed to prevent local noise from masking a transmission). If you're feeding that into a controller, the controller should have logic to prevent simultaneous keyups. If you're going back to back jumper wire installation, you will get exactly what you are seeing there, as in simultaneous keyup.

 

[davidgcet]

don't enable COR on both radios, only one should be setup as the RX radio to output the COR. ive done this before just to play with it, never actually put it in use though. the TX radio should be set to the TX freq only and the RX to the RX only. say you are using 462.000/467.000. The RX radio would have 467.000 programmed as an RX only channel, the TX radio would have 462.000 programmed in both RX and TX slots. Pin 8 would be enabled as COR on the RX radio and tied to the PTT pin on the TX radio.


if you are making a cross band repeater then of course my advice above is completely not applicable and you will need a controller.

 

[a417]

if you are making a cross band repeater then of course my advice above is completely not applicable and you will need a controller.

exactly right, I was thinking 1 way and not 2 way.

If you were to NEED to do it 2 way and use 2 MCS2ks with COR, this post from Batlabs describes a way to kludge it together.

 

[tazmadman]

thanks guys i got it working