---------------------------------------------------------- Avionics-List Digest Archive --- Total Messages Posted Sun 11/02/03: 1 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 06:32 AM - Re: AeroElectric-List: Garmin-AT ACU resolver questions (Ralph E. Capen) ________________________________ Message 1 _____________________________________ Time: 06:32:13 AM PST US From: "Ralph E. Capen" Subject: Avionics-List: Re: AeroElectric-List: Garmin-AT ACU resolver questions --> Avionics-List message posted by: "Ralph E. Capen" Alex, ACU is the acronym for Annunciation Control Unit. Essentially a relay box designed to switch between GPS and NAV signals to a single display head and indicate which source is in use...in addition to a couple of other functions reguired for IFR operations. I am describing the course deviation signals that you have referred to and agree completely with your statement about more than one signal.... I know what I can do about it - my intent here is to determine if I need to as even the UPSAT / Garmin AT website shows a diagram with the potential for both signals to get to the display. See: http://www.garmin-at.com/dwnlds/stackdoc/fullstackwiring.pdf It clearly shows their CDI directly attached to their SL-30 and through their ACU. We'll get to the bottom of this soon - I hope! Ralph Capen ----- Original Message ----- From: "Alex Peterson" Subject: RE: AeroElectric-List: Garmin-AT ACU resolver questions > --> AeroElectric-List message posted by: "Alex Peterson" > > > > > > I am installing a UPSAT full stack with GX-60 and SL-30 with > > their ACU attached to a Century NSD-1000 HSI as the primary > > display indicator. > > > > Here's my question: With the SL-30 NAV side set to output > > resolver signals (not switched by the ACU - supposed to be > > direct connected to the display) and the GX-60 outputting > > converter signalling (all it has) switched through the ACU, > > with the ACU set for GPS (sending the GPS converter > > signalling to the display) the SL-30 being direct connected > > can still send its resolver signals to the display....what > > happens when the display "sees" both sets of signals? I > > would think that they could cause the indicator to do weird > > things - especially if they are directionally conflicting. > > Ralph, I cannot understand your question. Please clarify a couple > things. > > What is an ACU? > > When you talk about resolver stuff, are you perhaps talking about the > course deviation indicator signals? My understanding of the resolver is > that it is the method by which the Nav radio knows what direction you > have the OBS pointed. > > In any case, it would seem not right to have a situation where more than > one signal can get to anything. > > Alex Peterson > Maple Grove, MN > RV6-A N66AP 397 hours > www.usfamily.net/web/alexpeterson > >