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Thread: What is a resolver on a CDI

  1. #1

    What is a resolver on a CDI

    I'm looking at a Mid-Continent CDI that could be used with a KLN-89B.

    The description includes the wore "resolver."

    What's that?


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  2. #2

    What is a resolver on a CDI

    > I'm looking at a Mid-Continent CDI that could be used with a KLN-89B.
    >
    > The description includes the wore "resolver."
    >
    > What's that?

    *** It's the gizmo inside the CDI that's hooked to the OBS knob. The
    resolver converts the position that you set on the knob to an electrical
    signal that goes to the converter, telling it what course you're interested
    in.

    The resolver is actually a sort of specialized variable transformer that
    takes 30Hz AC at the input and transforms it into 30Hz AC at the output -
    with a specific phase relationship to the AC that was at the input. The
    phase is shifted by the number of degrees corresponding to the desired
    radial.

    For me, these things are about as close to "magic" as it gets in the
    world of electronics.

    - Jerry Kaidor ( jerry@tr2.com )


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  3. #3
    Orbiting Earth Orbiting Earth corcoran's Avatar
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    What is a resolver on a CDI

    BAC/MMers

    If these words were part of my primary pilot learning... I would have taken up antique cars instead.

    "The resolver is actually a sort of specialized variable transformer that
    takes 30Hz AC at the input and transforms it into 30Hz AC at the output -
    with a specific phase relationship to the AC that was at the input. The
    phase is shifted by the number of degrees corresponding to the desired
    radial."

    Jerry Kaidor, Even if you made all that up I'm still impressed.

    Tom Corcoran
    c-o-l-d Boston!



    -----Original Message-----
    From: Jerry Kaidor <jerry@tr2.com>
    To: cloyd vanhook <cloydvanhook@yahoo.com>
    Cc: BAC Mail <bac-mail@beechaeroclub.org>
    Sent: Wed, 14 Dec 2005 08:50:20 -0800 (PST)
    Subject: Re: [BAC-Mail] What is a resolver on a CDI


    > I'm looking at a Mid-Continent CDI that could be used with a KLN-89B.
    >
    > The description includes the wore "resolver."
    >
    > What's that?

    *** It's the gizmo inside the CDI that's hooked to the OBS knob. The
    resolver converts the position that you set on the knob to an electrical
    signal that goes to the converter, telling it what course you're interested
    in.

    The resolver is actually a sort of specialized variable transformer that
    takes 30Hz AC at the input and transforms it into 30Hz AC at the output -
    with a specific phase relationship to the AC that was at the input. The
    phase is shifted by the number of degrees corresponding to the desired
    radial.

    For me, these things are about as close to "magic" as it gets in the
    world of electronics.

    - Jerry Kaidor ( jerry@tr2.com )


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  4. #4

    What is a resolver on a CDI

    Part of the certification process of an IFR GPS is to calibrate the Resolver
    to the GPS.
    After having some radio work done, they did not match anymore and my
    avionics guy appologized for not checking it. THe GPS will insure that the
    resolver is close to the desired track otherwise it flashes MSG and tells
    you to "line them up"

    Dr Bill
    76 Sundowner
    N9230S


    -----Original Message-----
    From: bac-mail-bounces@beechaeroclub.org
    [mailto:bac-mail-bounces@beechaeroclub.org]On Behalf Of
    mediareps@aol.com
    Sent: Wednesday, December 14, 2005 5:43 PM
    To: jerry@tr2.com; cloydvanhook@yahoo.com
    Cc: bac-mail@beechaeroclub.org
    Subject: Re: [BAC-Mail] What is a resolver on a CDI


    BAC/MMers

    If these words were part of my primary pilot learning... I would have taken
    up antique cars instead.

    "The resolver is actually a sort of specialized variable transformer that
    takes 30Hz AC at the input and transforms it into 30Hz AC at the output -
    with a specific phase relationship to the AC that was at the input. The
    phase is shifted by the number of degrees corresponding to the desired
    radial."

    Jerry Kaidor, Even if you made all that up I'm still impressed.

    Tom Corcoran
    c-o-l-d Boston!



    -----Original Message-----
    From: Jerry Kaidor <jerry@tr2.com>
    To: cloyd vanhook <cloydvanhook@yahoo.com>
    Cc: BAC Mail <bac-mail@beechaeroclub.org>
    Sent: Wed, 14 Dec 2005 08:50:20 -0800 (PST)
    Subject: Re: [BAC-Mail] What is a resolver on a CDI


    > I'm looking at a Mid-Continent CDI that could be used with a KLN-89B.
    >
    > The description includes the wore "resolver."
    >
    > What's that?

    *** It's the gizmo inside the CDI that's hooked to the OBS knob. The
    resolver converts the position that you set on the knob to an electrical
    signal that goes to the converter, telling it what course you're interested
    in.

    The resolver is actually a sort of specialized variable transformer that
    takes 30Hz AC at the input and transforms it into 30Hz AC at the output -
    with a specific phase relationship to the AC that was at the input. The
    phase is shifted by the number of degrees corresponding to the desired
    radial.

    For me, these things are about as close to "magic" as it gets in the
    world of electronics.

    - Jerry Kaidor ( jerry@tr2.com )


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  5. #5
    dvance at star-comm.net
    Guest

    What is a resolver on a CDI

    Hmmm. THe phase won't change until you get past a 180 degree rotation. A
    transformer is not a linear phase changing device. BUT the voltage will
    either increase or decrease, (depending on whether you are reading the sine
    or cosine output) from minimum to maximum.
    David
    81N


    At 10:50 AM 12/14/2005, Jerry Kaidor wrote:

    > > I'm looking at a Mid-Continent CDI that could be used with a KLN-89B.
    > >
    > > The description includes the wore "resolver."
    > >
    > > What's that?
    >
    >*** It's the gizmo inside the CDI that's hooked to the OBS knob. The
    >resolver converts the position that you set on the knob to an electrical
    >signal that goes to the converter, telling it what course you're interested
    >in.
    >
    > The resolver is actually a sort of specialized variable transformer that
    >takes 30Hz AC at the input and transforms it into 30Hz AC at the output -
    >with a specific phase relationship to the AC that was at the input. The
    >phase is shifted by the number of degrees corresponding to the desired
    >radial.
    >
    > For me, these things are about as close to "magic" as it gets in the
    >world of electronics.
    >
    > - Jerry Kaidor ( jerry@tr2.com )
    >
    >
    >_______________________________________________
    >BAC-Mail mailing list
    >BAC-Mail@beechaeroclub.org
    >http://www.beechaeroclub.org/mailman/listinfo/bac-mail

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  6. #6

    What is a resolver on a CDI

    > Hmmm. THe phase won't change until you get past a 180 degree rotation. A
    > transformer is not a linear phase changing device. BUT the voltage will
    > either increase or decrease, (depending on whether you are reading the
    > sine
    > or cosine output) from minimum to maximum.

    *** Well, it isn't _exactly_ a transformer. But it definitely manipulates
    phase. Because phase is where it's at for the VOR system.

    There is a 30-Hz sine wave amplitude-modulated onto the signal from the
    station. There is a second 9960-Hz carrier that is frequency modulated with
    a SECOND 30Hz sine wave. The phase of these two 30-Hz sine waves varies
    with respect to where you are around the station. If you are on radial
    360, the phase angle is zero.

    I got curious enough about the VOR system to simulate it in software. I
    wrote a program I call "vorgen" that generates the NAV signal
    algorithmically. With this program, you can hook an indicator up to your
    computer and it will indicate.

    Silly, I know, but I'm easily amused .

    - Jerry Kaidor ( jerry@tr2.com )







    > David
    > 81N
    >
    >
    > At 10:50 AM 12/14/2005, Jerry Kaidor wrote:
    >
    >> > I'm looking at a Mid-Continent CDI that could be used with a KLN-89B.
    >> >
    >> > The description includes the wore "resolver."
    >> >
    >> > What's that?
    >>
    >>*** It's the gizmo inside the CDI that's hooked to the OBS knob. The
    >>resolver converts the position that you set on the knob to an electrical
    >>signal that goes to the converter, telling it what course you're
    >> interested
    >>in.
    >>
    >> The resolver is actually a sort of specialized variable transformer
    >> that
    >>takes 30Hz AC at the input and transforms it into 30Hz AC at the output -
    >>with a specific phase relationship to the AC that was at the input. The
    >>phase is shifted by the number of degrees corresponding to the desired
    >>radial.
    >>
    >> For me, these things are about as close to "magic" as it gets in the
    >>world of electronics.
    >>
    >> - Jerry Kaidor ( jerry@tr2.com )
    >>
    >>
    >>______________________________________________ _
    >>BAC-Mail mailing list
    >>BAC-Mail@beechaeroclub.org
    >>http://www.beechaeroclub.org/mailman/listinfo/bac-mail
    >


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