Whelen Core PA

[TheSpotter]

Good evening,

I have a Whelen Cencom Core system installed. I have a PA microphone installed How do I add a second PA microphone? Is it possible and if so what equipment would I need to accomplish this. Thank you

 

[NoLimitSquads]

Good evening,

I have a Whelen Cencom Core system installed. I have a PA microphone installed How do I add a second PA microphone? Is it possible and if so what equipment would I need to accomplish this. Thank you

There is a long answer to this. You can buy a splitter, I believe 911 circuits makes one. Then you just plug two whelen pa mic cables to the single port on the Core. Or, get two cables, and just splice them both together. Here is the issue; the PA mics are noise canceling. So when you just hook two cables together, you are keying up both mics at the same time, and this causes your output volume to be much quieter. The only way around this issue, is to hook up both mic cables via relays, so that only one cable is hooked up at a time. In the applications that I have been doing, there is a second mic in the hatch of the suv. I use the hatch open as a trigger to switch the relays to the cable in the back. There are 3 wires in the PA cable, and all 3 wires will need their own relay.

 

[TheSpotter]

Thanks for the info. That’s exactly what I want to do is put the second PA in my trunk. I’m not too experienced with electrical work. Any chance you can send me a guide and what parts I would need for this project. That would be awesome.

 

[NoLimitSquads]

You will need the obvious, an extra PA cable and Mic. You don’t need the splitter, but if you get it, you can cut that apart vs cutting apart the pa cable. Then you need (3) 5-pin relays. If you dont get the y-harness, cut the ends off of the PA cables, giving yourself enough wire on one of the plugs to reach the location where your relays will be mounted. From the plug on the core, attach each one of the three wires to pin 30 on each relay. For your front mic cable, attach each wire to pin 87a on each relay. For the rear cable, attach each wire to pin 87 on the relays. Ground pin 85 on each relay, and attach each pin 86 to your trigger wire that will switch from front mic to rear mic. Set up like this, the front mic will be the default, and your rear will only work when triggered. You can use whatever you want to trigger it, a switch, or an output from core that triggers automatically under certain conditions,