Today's Message Index:
----------------------
1. 01:16 AM - Century 1 Autopilot Musings (Peter Mather)
2. 01:48 AM - Re: NAV splitter grounded? (John MacCallum)
3. 08:22 AM - Re: Century 1 Autopilot Musings (gregmchugh)
4. 11:28 AM - Re: NAV splitter grounded? (Martymason)
5. 04:02 PM - Re: Anyone interested in a 9lb battery/jumpstart kit? (rparigoris)
6. 06:16 PM - Re: Re: Anyone interested in a 9lb battery/jumpstart kit? (Sam Marlow)
Message 1
INDEX | Back to Main INDEX |
NEXT | Skip to NEXT Message |
LIST | Reply to LIST Regarding this Message |
SENDER | Reply to SENDER Regarding this Message |
|
Subject: | Century 1 Autopilot Musings |
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
Message 2
INDEX | Back to Main INDEX |
PREVIOUS | Skip to PREVIOUS Message |
NEXT | Skip to NEXT Message |
LIST | Reply to LIST Regarding this Message |
SENDER | Reply to SENDER Regarding this Message |
|
Subject: | NAV splitter grounded? |
It will depend on the type of Antenna and where it is mounted but
ordinarily it would not matter if the spacing between the Antenna and
another object]is more than a qtr wave.
Mulitpath and Rayleighan fading will vary constant anyway on a moving
object such as an aircraft.
Cheers
John MacCallum
Builder #41016
VH-DUU
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of David
Lloyd
Sent: Monday, 4 June 2012 3:27 AM
Subject: Re: AeroElectric-List: NAV splitter grounded?
I am wondering if the antenna, mounted under the all metal airframe is
possibly seeing multiple images off the metal structures with phasing caused
by the different paths.....
D
_____
----- Original Message -----
From: Rob Kochman <mailto:rv10rob@gmail.com>
Sent: Sunday, June 03, 2012 9:40 AM
Subject: Re: AeroElectric-List: NAV splitter grounded?
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.
-Rob
On Sat, Jun 2, 2012 at 6:50 AM, Robert L. Nuckolls, III
<nuckolls.bob@aeroelectric.com> wrote:
<nuckolls.bob@aeroelectric.com>
At 08:33 PM 6/1/2012, you wrote:
Quick question: Should the Comant CI-507 Nav/GS splitter (between my antenna
and GNS430) be isolated from the airframe ground? Seems like the answer is
"yes" but I didn't think about it when wiring my panel, and it's currently
not isolated. I'm thinking this could be responsible for my "jumpy"
needles.
As Dave pointed out, the metallic enclosure
of your splitter has continuity to ground
by way of the coax shields that are tied
to it through the connectors.
Things that go on 'inside the wall of shields'
in a feed line system is pretty much an isolated
world. Just how and where the shields get tie
to the airframe . . . or whether they ever get
tied to airframe has no influence upon the
business of getting radio frequency power from
one end to the other.
Are you seeing similar symptoms with more than
one steering needle? Both VOR or is one of them
a Glide Slope?
Bob . . .
==========================================
_ities such as List Un/Subscription,
www.matronics.com/Navigator?AeroElectric-List"
target="_blank">http://www.matronics.com/Navigator?AeroElectric-List
======================ttp://forums.matronics.com/"
target="_blank">http://forums.matronics.com
====================== -Matt Dralle, List Admin.
===============================
--
Rob Kochman
RV-10 Flying since March 2011
Woodinville, WA
http://kochman.net/N819K
href="http://www.matronics.com/Navigator?AeroElectric-List">http://www.matro
nics.com/Navigator?AeroElectric-List
href="http://forums.matronics.com">http://forums.matronics.com
href="http://www.matronics.com/contribution">http://www.matronics.com/c
Message 3
INDEX | Back to Main INDEX |
PREVIOUS | Skip to PREVIOUS Message |
NEXT | Skip to NEXT Message |
LIST | Reply to LIST Regarding this Message |
SENDER | Reply to SENDER Regarding this Message |
|
Subject: | 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
INDEX | Back to Main INDEX |
PREVIOUS | Skip to PREVIOUS Message |
NEXT | Skip to NEXT Message |
LIST | Reply to LIST Regarding this Message |
SENDER | Reply to SENDER Regarding this Message |
|
Subject: | Re: NAV splitter grounded? |
Rob,
If you only have one NAV receiver connected to the splitter, then the second leg
of the splitter is open and is not terminated. This condition will result in
reflected signals at the connected receiver and may result in your jumpy needles.
I would remove the un-needed splitter and connect the antenna directly to
the receiver using a BNC-BNC connector. If the jumpiness disapears then problem
solved.
Marty Mason
Retired CATV engineer (Much work with antennas and co-axial cable networks)
--------
Marty Mason
Europa XS Mono
10%
Norcross, GA
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=374689#374689
Message 5
INDEX | Back to Main INDEX |
PREVIOUS | Skip to PREVIOUS Message |
NEXT | Skip to NEXT Message |
LIST | Reply to LIST Regarding this Message |
SENDER | Reply to SENDER Regarding this Message |
|
Subject: | Re: Anyone interested in a 9lb battery/jumpstart kit? |
Hi Sam
Sorry, but I misplaced your E-mail address and couldn't find it on a Aeroelectric
search. Could not find your phone number in a Google search.
Anyway I sent off your two jump start kits today with an expected delivery 06-05-2012.
If by chance you don't receive a day or two after that, please E-mail or call me.
Ron Parigoreis
Hm 631-979-7675 (OK till 9PM)
Cell 631-839-3636
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=374715#374715
Message 6
INDEX | Back to Main INDEX |
PREVIOUS | Skip to PREVIOUS Message |
NEXT | Skip to NEXT Message |
LIST | Reply to LIST Regarding this Message |
SENDER | Reply to SENDER Regarding this Message |
|
Subject: | Re: Anyone interested in a 9lb battery/jumpstart |
kit?
Thanks Ron!
Sam 513-482-1233
rparigoris wrote:
> --> AeroElectric-List message posted by: "rparigoris"<rparigor@suffolk.lib.ny.us>
>
> Hi Sam
>
> Sorry, but I misplaced your E-mail address and couldn't find it on a Aeroelectric
search. Could not find your phone number in a Google search.
>
> Anyway I sent off your two jump start kits today with an expected delivery 06-05-2012.
>
> If by chance you don't receive a day or two after that, please E-mail or call
me.
>
> Ron Parigoreis
> Hm 631-979-7675 (OK till 9PM)
> Cell 631-839-3636
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=374715#374715
>
>
Other Matronics Email List Services
These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.
-- Please support this service by making your Contribution today! --
|