hasbroucka(at)yahoo.com
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 Posted: Mon Dec 02, 2013 1:01 pm Post subject: Two Audios wired to One PM-3000 input thru a 500ohm resistor |
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Hi,
I am installing a PM-3000, 11931-A in my SeaRey Amphibian. This device has two Un-switched inputs, and I have three audio output warning devices. I have gained some understanding from the archives that an isolation amplifier is needed to make this work properly, but the SeaRey factory and dealer are telling me that all I need to do is to connect my Gear Alert and my Power Buss alert audio wires to a 500ohm resistor each, and connect them to a single un-switched audio input on the PM-3000. Both of these devices have adjustable gain. The remaining input connects to the SkyView audio out.
The instruction is qualified with the fact that this has been performed satisfactorily on many of these aircraft. Yet what I learned from The List, and from AE Connection, leaves me skeptical.
I sent a note to PS Engineering over a week ago, no response yet.
Can anyone shed some light on how acceptable this is, or why and how I should do something different?
I also am a little troubled by the SkyView instructions for multiple SV Screens, that CLEARLY state; to electrically connect both left and right stereo outputs together at each screen connector (creating a Mono output), PLUS to jumper across all screens. This is to ensure that regardless of power to any screen, all audio warning will be heard. This is not only clearly communicated, they provide an example making clear all 4 audio outputs of a two screen system are twisted together and fed to one input on the Intercom. Any comments regarding this instruction?
Thanks,
Alan ,
HasbrouckA(at)yahoo.com
SeaRey Amphibian, Assembled and Painted. Working on VFR avionics and wiring (Dynon Skyview full suite). Top Priority is keep it light, and place weight forward!
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