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1. 06:32 AM - Re: AeroElectric-List: Garmin-AT ACU resolver questions (Ralph E. Capen)
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<aeroelectric-list@matronics.com>
| Subject: | Re: AeroElectric-List: Garmin-AT ACU resolver questions |
--> Avionics-List message posted by: "Ralph E. Capen" <recapen@earthlink.net>
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" <alexpeterson@usjet.net>
Subject: RE: AeroElectric-List: Garmin-AT ACU resolver questions
> --> AeroElectric-List message posted by: "Alex Peterson"
<alexpeterson@usjet.net>
>
>
> >
> > 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
>
>
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