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Total Members Voted: 10

[ratchet]

Did it sound one time when you armed the console for the test?
I have had them go off if I arm the system shortly after they where sounding from an alarm.
I think the circuit that triggers after the on off cycles have added up. Need time to totally discharge or they start sounding again.
Some of the 2007-2009 Date Code units sounded evertime the console was armed.

I have no idea if they made a peep even when I armed as I had the ear protectors on.  Relative to the on/off cycle, is that what they do during an alarm?  Thank you!  

[Brian H]

The Powerhorns trigger on a one second cycle of power line signals. Takes about 4 cycles to trigger them and they sound for about 4 seconds after the cycle stops.
All Lights On, All Units Off to the House Code they are set to or an On, Off cycle to its Address.

The problem is the new SC1200A and the Radio Shack 49-1000MC. That was made by X10 for them.
Sends the two Light Address. The old model console only send one address and uses All Lights On, All Units Off.
Like A1, A2, AOn. Then A1, A2, AOff. Some versions of the Powerhorns did not trigger because the second address being sent messed up the Powerhorns seeing the cycle correctly.
Some sounded sporadically and some just take extra time to start triggering.
I have two Date Code 2010 ones that trigger then stop then start again. My 2004s just take extra time to trigger. A 2009 sounds one blast everytime the SC1200 is armed and the lights flash to indicate a successful arm.
All my findings are for the PH508 Large Powerhorn. I have no real data on the SH10A Small Powerhorns and how they work with a SC1200A.

[Brian H]

If you want to trigger them as a test. You can do it without triggering an alarm.

On the SC1200As keyboard. Enter the address the Powerhorns are set to. Then repeatedly send an On then Off with the buttons. It should sound after maybe 4 cycles for as long as the On and Off cycle is being sent and stop in about 4 seconds after the signals stop.
Any lights on the address will also go On and Off.