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APX New Version of O3 HHCH?

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james_garner

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Jan 22, 2005
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I have several O3 HHCH units and the latest one I bought has siren control buttons.
Do I need a SLIM to make it work with an APX 7500 or will it work on its own like a O9 control head?

Thanks and 73,

N5VV
 

Mr_Boh

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There are a couple ways to do lights and sirens, with varying degrees of difficulty and reliability. Someone on eBay has the Whelen siren that directly interfaces for sale, but I have heard mixed reviews of the reliability. You could also do a relay box and trigger them that way.

The only difference between the two O3 is the keypad itself, and you can buy that on it’s own.
 

sfd119

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Jul 18, 2009
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There are a couple ways to do lights and sirens, with varying degrees of difficulty and reliability. Someone on eBay has the Whelen siren that directly interfaces for sale, but I have heard mixed reviews of the reliability. You could also do a relay box and trigger them that way.

The only difference between the two O3 is the keypad itself, and you can buy that on it’s own.

Got a link?
 
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