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JimT
Joined: 27 Feb 2006
Posts: 22
Location: Auburn, ME
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 Posted: Sat Aug 22, 2009 10:34 am Post subject: Collins 350A |
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This is more avionics then electric but a question anyway.
Wiring a Garmin 300 xl to a collins ind 350-A indicator. The Garmin does not provide a resolver H output.
What is the function pf resolver H ( or any of the other Resolvers)?
Is it necessary in this setting?
Jim Timoney
[quote][b]
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rjquillin
Joined: 13 May 2007
Posts: 123
Location: KSEE
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| Posted: Sun Aug 23, 2009 9:14 am Post subject: Collins 350A |
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At 11:28 8/22/2009, you wrote:
| Quote: | This is more avionics then electric but a question anyway.
Wiring a Garmin 300 xl to a collins ind 350-A indicator. The Garmin does not provide a resolver H output.
What is the function pf resolver H ( or any of the other Resolvers)?
Is it necessary in this setting?
Jim Timoney |
And likely may get a better answer there as well, but here goes...
Resolvers, generally associated with NAV and VOR's, most commonly have a six wire interface. Rotor connections A & C are fed a 30Hz reference signal and stator sin and cos connections D & E and F & G are connected to phase detectors in the receiver to resolve the difference between the reference and received, based on position relative to a VOR station, signal.
For a heading system, perhaps with a remote flux gate, some similar sounding connections exist. There is again a rotor with H & C connections, and a stator with three, 120 deg spaced windings labeled X, Y & Z.
Notice the similarity with the rotor; A & C vs. H & C. Where C is generally a common, and perhaps at ground potential, and the A and H connections are 'hot'. There seems to be a tendency not to differentiate in labeling between the A & H signals, and in both cases, heading system and VOR resolver, to call hot signal connection "H".
Some GPS navigators incorporate the capability for an OBS like mode where a course can be defined as a 'radial' to or from an active waypoint; in a manner analogous to a radial to or from a VOR station. For this feature to function, a NAV, VOR or HSI head with OBS setting capability must be connected to the navigator. Minimally this will require four connections, a common connection, stator 'hot' sin and cos signals D & F and a rotor 'hot' connection A or H, depending on how the manufacturer has chosen to label the rotor hot signal.
Hope this helps...
Ron Q.
[quote][b]
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BobsV35B(at)aol.com
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| Posted: Sun Aug 23, 2009 9:49 am Post subject: Collins 350A |
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Good Morning Jim and Ron,
While all such electronic discussions are over my head, I do have a Garmin 300XL mounted in my Stearman without using a resolver. I doubt if I could get the FAA to certificate it for IFR the way I have it, but I can do all of the IFR functions. With a blanket over my head and a safety pilot in the front pit, I have shot all of the GPS approaches in our area.
The resolver was one of the very stupid requirements forced on the industry by one particular FAA inspector who was in charge of all GPS approvals. He wanted all GPSs to work just like a VOR and he insisted that a resolver be used. Trimble, Apollo, and Northstar realized the absurdity of the situation and fought the good fight to not have a resolver.
Garmin caved in as did King. They got their boxes approved a full year before Trimble, Apollo, and Northstar.
I still think the Trimble was the best of the lot and the Northstar was a close second, but by caving in to that one FAA inspector, Garmin got a major jump on the competition and we see who is left. Trimble and Northstar managed to get that inspector replaced, but they still lost the war!
In any case, you really do not need the resolver function to use all the capabilities of the 300XL. It takes a bit more understanding of the system, but it is not hard at all.
Incidentally, if you are flying a 430 or a 530 and just ignore the message that tells you to set in the course. The set will still do everything it needs to do. The resolver is not needed with either of those sets to get the job done. It is just a carry over from one misguided FAA inspector.
The only disadvantage of not setting in the course is when you are using an HSI.
If you don't set in the correct course, the HSI picture will look funny. Still works fine, just looks different. Not having to have the resolver saved over one thousand 1994 dollars in every installation.
As you can tell this is a VERY sore subject with me<G>!
Happy Skies,
Old Bob
Stearman N3977A
Brookeridge Air Park LL22
In a message dated 8/23/2009 12:15:19 P.M. Central Daylight Time, rjquillin(at)gmail.com writes:
| Quote: | At 11:28 8/22/2009, you wrote:
| Quote: | This is more avionics then electric but a question anyway.
Wiring a Garmin 300 xl to a collins ind 350-A indicator. The Garmin does not provide a resolver H output.
What is the function pf resolver H ( or any of the other Resolvers)?
Is it necessary in this setting?
Jim Timoney |
And likely may get a better answer there as well, but here goes...
Resolvers, generally associated with NAV and VOR's, most commonly have a six wire interface. Rotor connections A & C are fed a 30Hz reference signal and stator sin and cos connections D & E and F & G are connected to phase detectors in the receiver to resolve the difference between the reference and received, based on position relative to a VOR station, signal.
For a heading system, perhaps with a remote flux gate, some similar sounding connections exist. There is again a rotor with H & C connections, and a stator with three, 120 deg spaced windings labeled X, Y & Z.
Notice the similarity with the rotor; A & C vs. H & C. Where C is generally a common, and perhaps at ground potential, and the A and H connections are 'hot'. There seems to be a tendency not to differentiate in labeling between the A & H signals, and in both cases, heading system and VOR resolver, to call hot signal connection "H".
Some GPS navigators incorporate the capability for an OBS like mode where a course can be defined as a 'radial' to or from an active waypoint; in a manner analogous to a radial to or from a VOR station. For this feature to function, a NAV, VOR or HSI head with OBS setting capability must be connected to the navigator. Minimally this will require four connections, a common connection, stator 'hot' sin and cos signals D & F and a rotor 'hot' connection A or H, depending on how the manufacturer has chosen to label the rotor hot signal.
Hope this helps...
Ron Q.
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