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Xpr doorbell

pkuntzy

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We have a system of roughly 30 xpr 3300e's and an xpr 8400. We have 3 channels. 2 on the same frequency through the 8400 and one radio to radio.

What I am looking to accomplish is as follows. Our security gaurd goes on patrol regularly. We need an outside doorbell that rings the only gaurds radio while he is still on any channel to alert him to return to the gaurd shack. A bonus would be and intercom. Any thoughts on how this could work?
 

AM909

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Presumably this is DMR, since you said "2 on the same frequency through the 8400". How about a callbox, programmed to selcall just the guard's radio. Ritron has the HD series that apparently does DMR or NXDN now. Based on the stack of the older ones in our boneyard, I'm going to guess you should get a spare.
 

ramal121

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You can certainly signal radios with a logic input using the telemetry function. Easy enough to hook up a doorbell to a control base.

The problem is you cannot span the telemetry across two different time slots (which I assume you have) and the direct channel all at once. You'd need three separate radios to do this.

What may work is to make a third channel on the repeater with a different contact ID just for the telemetry function. Either slot would work. Add this channel to the radios and set up permanent autoscan to this channel so any of the other channels will fall over to the doorbell channel when activated.

I did similar once for a remote gate for "doorbell"/intercom/gate open at a large ranch.
 
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ramal121

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Looking back, You only want this to operate on the one guard channel, correct?
 
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ramal121

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Forget what I said, XPR3300 do not do telemetry. You'd have to upgrade. I used XPR7550's.

Maybe use the emergency function? Just throwing things out there.
 

TampaTyron

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I fourth the callbox. You could use the "Faux ALL CALL" method of scanning a third "fake" channel that causes radios to stop on that channel during their scan cycle. The only issue is whichever slot you use will have some contention if anyone else is using the repeater at the same time as the fake all call channel.

TT
 
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