i have done a similar install at a horse ranch. the distance is the biggest problem. the install that i done was 1500 feet. the intercom was a TnT (Touch and Talk) that works through regular house phone. They sell a Impedance matching transfomer that will change the speaker impedance so that...
Theres no way of doing this over ip. that would mean the m1 would have the way of doing voice over ip and it doesn't. plus how would you listen to it, is there a gui that you access so you can listen in on your computer.
I found a VOX activated relay board on line, have not used it but i think i might. this can be used in other applications as well.
http://www.quasarelectronics.com/cpm014.htm
Excellent. Also note that "Ramp" is also another term for Extended. A good example of this ALC feature is its ability to take hours to slowly brighten (or dim). I use this often. Here is an example. Tell your system to start the ramp (from off) 45 minutes before sunset and take 45 minutes to...
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