AeroElectric-List Digest Archive

Tue 06/05/12


Total Messages Posted: 6



Today's Message Index:
----------------------
 
     1. 01:00 AM - Re: NAV splitter grounded? (D L Josephson)
     2. 05:40 AM - Re: Re: Anyone interested in a 9lb battery/jumpstart kit? (ROGER & JEAN CURTIS)
     3. 06:05 AM - Re: Re: Century 1 Autopilot Musings (Peter Mather)
     4. 06:52 AM - Re: Re: NAV splitter grounded? (Rob Kochman)
     5. 10:18 AM - 9lb battery/jumpstart kits, all orders shipped except three orders I received over the last few days. (rparigor@suffolk.lib.ny.us)
     6. 11:08 AM - Re: Century 1 Autopilot Musings (Paul Millner)
 
 
 


Message 1


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    Time: 01:00:11 AM PST US
    From: D L Josephson <dlj04@josephson.com>
    Subject: Re: NAV splitter grounded?
    Rob Kochman<mailto:rv10rob@gmail.com> wrote > Thanks, guys... I have only one nav radio, and I'm seeing jumpy needles on > both the lateral (VOR and localizers) as well as glideslope. GPS needle > (lateral only) is rock solid. I have this antenna: > http://www.rami.com/product-view.php?pid=8. It's mounted under the > horizontal stabilizer on an RV-10. Going to do more testing today. Can you provide a little more info on "jumpy needles?" Are you getting this in a place where the signals from the VOR or localizer and the glideslope are expected to be strong? If you fly the whole ILS, at some point (certainly before you reach the outer marker) both of these signals should be big enough to swamp any sort of interference in the airplane. Do you hear any unusual noises in the VOR/LOC audio? Someone suggested getting rid of the splitter but of course you need that to feed the glideslope receiver. As Bob suggested, there's not likely to be a grounding or ground loop issue no matter where the coax is grounded, but there can be lots of other problems. -- David Josephson


    Message 2


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    Time: 05:40:55 AM PST US
    From: "ROGER & JEAN CURTIS" <mrspudandcompany@verizon.net>
    Subject: Re: Anyone interested in a 9lb battery/jumpstart
    kit? > > Anyway I sent off your two jump start kits today with an expected delivery 06-05-2012. Ron, Do you have a projected shipping schedule for the remainder of the orders? Roger


    Message 3


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    Time: 06:05:06 AM PST US
    From: "Peter Mather" <peter@mather.com>
    Subject: Re: Century 1 Autopilot Musings
    Greg Thanks for the link - I'll study it and see where it gets me.I've home built Arduino based circuits before so this looks a good start Best Regards Peter ----- Original Message ----- From: "gregmchugh" <gregmchugh@aol.com> Sent: Monday, June 04, 2012 5:13 PM Subject: AeroElectric-List: Re: Century 1 Autopilot Musings > > Peter, > > As a starting point I would take a look at the ArduPilot software to > see if there is an option to simplify it down to what you need. The > complete autopilot functionality is there but I don't know how > modular the software architecture is and if it would be difficult > to simplify the functionality down to what you need. The ArduPilot > hardware would be more than you need but you could configure > a stripped down hardware version using Arduino boards for > the reduced functionality. > > If you want to leave room for adding more functions you could go > with the $199 full hardware configuration and add more autopilot > functions in the future. In any case the software is freely available for > you to take a look at the algorithms needed for your application. > Somewhere in there is an algorithm for course following. > I have not looked at the software and documentation so I don't > know how hard it would be to do what I am suggesting. Here is > a starting point that will lead you to more info. > > http://www.diydrones.com/notes/ArduPilot > > Greg McHugh > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=374673#374673 > > >


    Message 4


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    Time: 06:52:58 AM PST US
    Subject: Re: NAV splitter grounded?
    From: Rob Kochman <rv10rob@gmail.com>
    Thanks, David... I need to do more testing before I can be sure of too much. It seems to be better closer to the station, though it's sometimes still jumpy fairly close to the station. It also seems to be worse in rain and clouds. Here's a video that shows an example halfway down an ILS. In this one, the localizer is stable, but the glideslope is moving around. http://www.youtube.com/watch?v=UkClTxpcPB8 I'll report back more info when I have it. I do appreciate the help. -Rob On Tue, Jun 5, 2012 at 12:58 AM, D L Josephson <dlj04@josephson.com> wrote: > dlj04@josephson.com> > > Rob Kochman<mailto:rv10rob@gmail.**com <rv10rob@gmail.com>> wrote > > Thanks, guys... I have only one nav radio, and I'm seeing jumpy needles >> on >> both the lateral (VOR and localizers) as well as glideslope. GPS needle >> (lateral only) is rock solid. I have this antenna: >> http://www.rami.com/product-**view.php?pid=8<http://www.rami.com/product-view.php?pid=8>. >> It's mounted under the >> horizontal stabilizer on an RV-10. Going to do more testing today. >> > > Can you provide a little more info on "jumpy needles?" Are you getting > this in a place where the signals from the VOR or localizer and the > glideslope are expected to be strong? If you fly the whole ILS, at some > point (certainly before you reach the outer marker) both of these signals > should be big enough to swamp any sort of interference in the airplane. Do > you hear any unusual noises in the VOR/LOC audio? Someone suggested getting > rid of the splitter but of course you need that to feed the glideslope > receiver. As Bob suggested, there's not likely to be a grounding or ground > loop issue no matter where the coax is grounded, but there can be lots of > other problems. > > -- > David Josephson > > -- Rob Kochman RV-10 Flying since March 2011 Woodinville, WA http://kochman.net/N819K


    Message 5


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    Time: 10:18:41 AM PST US
    Subject: 9lb battery/jumpstart kits, all orders shipped except
    three orders I received over the last few days.
    From: rparigor@suffolk.lib.ny.us
    Hi Roger All orders have been shipped except for three I received over the last few days. Those will ship within the next week. Your order has a scheduled delivery 06-06-2012. I will be sending out a second round of particulars within the hour. Ron Parigoris CURTIS" > <mrspudandcompany@verizon.net> > >> >> Anyway I sent off your two jump start kits today with an expected >> delivery > 06-05-2012. > > Ron, > > Do you have a projected shipping schedule for the remainder of > the orders? > > Roger > > > > > > > > >


    Message 6


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    Time: 11:08:13 AM PST US
    From: Paul Millner <millner@me.com>
    Subject: Re: Century 1 Autopilot Musings
    Porcine Associates, principal Jim Ham, makes JUST such a device! Paul On 6/4/2012 1:14 AM, Peter Mather wrote: > <peter@mather.com> > > The Century 1 autopilot is a competent wing leveller but has very > basic tracking capability - however, upgrading to a higher spec > aoutopilot is too expensive to contemplate. Basically all the Century > 1 sees is the course deviation output from a GPS or Nav set. It has no > knowledge of course, track etc. This is easily demonstrated by > engaging tracking when well off course with, for example, the > deviation at full scale left. The autopilot correctly turns towards > the course but if the deviation stays full scale the aircraft then > circles endlessly. > > It seems to me that a simple microprocessor program could read in the > NMEA output of a GPS and artificially create a course deviation > output. So for example if you are well left of track it could create a > full left deviation until the aircraft has turned onto a 30degree > intersection course at which point it could send a centered signal. > Then when approaching the desired track it could send a right > deviation to turn the aircraft onto the track. > > Has anyone tried playing with such an idea or can anyone point me at > any algorithms that might provide a starting point? > > Thanks > > Peter > > -- Please note my new email address! millner@me.com




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