Today's Message Index:
----------------------
1. 11:10 AM - Re: Right angle BNC (R&J. Curtis)
2. 11:25 AM - Direction Indicator Needs (Owen Baker)
3. 12:36 PM - Re: Direction Indicator Needs (Dj Merrill)
4. 01:39 PM - Re: testing a coax lead (MLWynn@aol.com)
5. 03:17 PM - Direction Indicator Needs (Owen Baker)
6. 04:02 PM - Re: Direction Indicator Needs (Ryan Brown)
Message 1
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| Subject: | Re: Right angle BNC |
>>Bob,
>>
>>I just received some of the right angle BNC connectors that we were
>>discussing a couple of weeks ago. They do come with no
>>instructions. I am assuming that the cable will be properly
>>prepared and the center conductor will be soldered into the notch in
>>the back end of the center conductor pin, then the barrel will crimp
>>over the braid as in a standard straight connector.
>>
>>Am I correct that the center conductor will be soldered?
>
> Correct. The trim dimensions for this connector are
> the same as for a straight connector . . . except
> the center conductor is a tad bit shorted and soldered
> to the notched stud as opposed to crimped.
>
> The treaded cap covers the finished joint.
Just as I thought! Thanks for the confirmation, Bob
Roger
Message 2
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| Subject: | Direction Indicator Needs |
6/10/2014
Hello Aeroelectric and Avionics Listers, I know that there are many
technically smart people on these lists and I would like to enlist your
assistance.
Picture this situation: There are hundreds (maybe thousands) of EAB
(Experimental Amateur Built) IFR capable aircraft flying around with
vacuum driven mechanical spinning mass gyroscopic attitude and
directional indicators. A large percentage of these builders and pilots
would like to (or need to) replace those indicators with something
electronic (other than expensive electrical motor driven mechanical
spinning mass gyroscopic) in nature and remove the entire vacuum system
from their EAB.
Replacing the attitude indicator does not appear to be a big problem in
meeting the requirement of 14 CFR 91.205 (d) (8) =9CGyroscopic
pitch and bank indicator (artificial horizon)=9D since there are
several offerings available. Here are some:
http://www.dynonavionics.com/docs/D6_intro.html
http://trutrakap.com/product/gemini-pfd/
http://www.grtavionics.com/mini.html
http://www.sandia.aero/?q=node/80
But there does not appear to be available an electronic directional
indicator that would meet the 14 CFR 91.205 (d) (9) criteria for a
=9CGyroscopic directional indicator (directional gyro or
equivalent)=9D if one believes that the Regulatory intended
direction to be indicated must indeed be the current aircraft magnetic
heading and not the current aircraft magnetic course (provided by GPS)
over the surface.
I feel that somewhere in the electronic magic that MEMS
<< https://www.memsnet.org/mems/what_is.html >>
and AHARS
<<
http://www.microstrain.com/inertial/3DM-GX3-25?gclid=CjgKEAjw2dqcBRC2q-
LXjpfxjnQSJAAeYF5LUC4gvWycBVg6DDW_mzzSdTyyF3q0yoQHrT6ij9VbvvD_BwE >>
represents there must be a practical, relatively inexpensive means of
creating a direction indicator that will meet the intended requirements
of 14 CFR 91.205 (d) (9). If so, I (and probably many others) would
like to buy one for my EAB airplane.
How about it experts (and entrepreneurs) are my desires hopeless and
unrealistic?
OC
'O C' Baker says "The best investment you can make is the effort to
gather and understand information."
Message 3
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| Subject: | Re: Direction Indicator Needs |
On 06/10/2014 02:24 PM, Owen Baker wrote:
> But there does not appear to be available an electronic directional
> indicator that would meet the 14 CFR 91.205 (d) (9) criteria for a
> Gyroscopic directional indicator (directional gyro or equivalent) if
> one believes that the Regulatory intended direction to be indicated must
> indeed be the current aircraft magnetic heading and not the current
> aircraft magnetic course (provided by GPS) over the surface.
>
I am not familiar with the other brands, but the GRT EFIS units come
with an external magnetometer box which gives magnetic heading
information to the EFIS.
Is that what you are asking about?
-Dj
--
Dj Merrill - N1JOV - VP EAA Chapter 87
Sportsman 2+2 Builder #7118 N421DJ - http://deej.net/sportsman/
Glastar Flyer N866RH - http://deej.net/glastar/
Message 4
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| Subject: | Re: testing a coax lead |
Problem solved.
So, Bob, your will be gratified to know that you DIY right angle connector
record remains intact. Nothing wrong with that.
I started with continuity testing. The pin at the transponder did not
have continuity with the pin at the antenna. My first thought was that I had
fouled up the connector. For whatever reason, I tested the ground
connector and discovered no continuity there, either.
After a short head scratch, I tested all the other antennae and discovered
that I had somehow switched the labels, and hence the connection, of the
transponder antenna with the marker beacon antenna. For future reference, a
transponder does not develop proper output when connected to a DIY marker
beacon antenna.
Fortunately, they were very close together so all I had to do was switch
the antenna inputs. Not quite enough slack to reproduce the nicely glued
DYI right angle, but the connection is solid enough and the transponder works
per specs.
So, thanks again for your help.
Regards,
Michael Wynn
RV 8 Finished!
San Ramon, CA
In a message dated 5/31/2014 9:37:17 A.M. Pacific Daylight Time,
nuckolls.bob@aeroelectric.com writes:
--> AeroElectric-List message posted by: "Robert L. Nuckolls, III"
<nuckolls.bob@aeroelectric.com>
Shoot me your mailing address and I'll get some
connectors in the mail to you today.
Sorry, I tought I had some rt-angle connectors
in inventory . . . I'm out.
Here's the source I've used for years
http://tinyurl.com/mfp9cfg
takes awhile to get parts but they've
been consistently good. I've just ordered
10 to refurbish my inventory.
http://tinyurl.com/m6ywj9p
Depending on how 'tight' you are for schedule, I
can offer connectors in when my order gets
here . . .will only take a few days longer
than ordering for yourself . . .
Bob . . .
Bob . . .
Message 5
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| Subject: | Direction Indicator Needs |
6/10/2014
Hello Dj Merrill, Thanks for your quick response. You wrote: ".... an
external magnetometer box which gives magnetic heading
information to the EFIS."
1) See here for information on what constitutes a magnetometer:
http://science.howstuffworks.com/magnetometer-info.htm
If the heading that appears on the display, see here:
http://www.grtavionics.com/mini.html#Features
is simply the indication of a remotely located magnetometer (which is
available for the Mini-X and Mini-AP, but not the Mini-B) then I don't think
that will meet the intended requirement of 14 CFR 91.205 (d) (9) criteria
for a Gyroscopic directional indicator (directional gyro or equivalent).
2) One other big downside of the Mini displays from GRT was GRT's failure to
package the units such that they could be readily installed in a standard
round nominally 3 inch instrument cut out hole where the old attitude
indicator resides. See here:
http://www.grtavionics.com/Mini%20Drawing%202.pdf
Needing to cut panel metal to install a Mini unit from GRT in an existing
panel raises the difficulty of a swap over significantly. Note that Sandia
recognized the significance of this issue and packaged the SAI 340 - Quattro
accordingly. See here:
http://www.sandia.aero/?q=system/files/SAI340BroR2Web.pdf
I am still searching.
OC
===================================================================
From: Dj Merrill
Sent: Tuesday, June 10, 2014 3:34 PM
Subject: Re: AeroElectric-List: Direction Indicator Needs
I am not familiar with the other brands, but the GRT EFIS units come
with an external magnetometer box which gives magnetic heading
information to the EFIS.
Is that what you are asking about?
-Dj
--
Dj Merrill - N1JOV - VP EAA Chapter 87
Sportsman 2+2 Builder #7118 N421DJ - http://deej.net/sportsman/
Glastar Flyer N866RH - http://deej.net/glastar/
================================================
On 06/10/2014 02:24 PM, Owen Baker wrote:
> But there does not appear to be available an electronic directional
> indicator that would meet the 14 CFR 91.205 (d) (9) criteria for a
> Gyroscopic directional indicator (directional gyro or equivalent) if
> one believes that the Regulatory intended direction to be indicated must
> indeed be the current aircraft magnetic heading and not the current
> aircraft magnetic course (provided by GPS) over the surface.
>
Message 6
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| Subject: | Re: Direction Indicator Needs |
The dynon d6 pilot guide says "Like a conventional gyro-stabilized magnetic
compass, magnetic heading reacts immediately to turn rate so that heading
changes are reflected immediately. It then uses magnetometer data over the
long term to ensure that it remains correct. Additionally, heading is
corrected for attitude so that it is accurate as you pitch and roll. "
Sounds equivalent to a dg to me.
The gemini feature list also includes "Track DG"
On Tue, Jun 10, 2014 at 11:24 AM, Owen Baker <bakerocb@cox.net> wrote:
> 6/10/2014
>
> Hello Aeroelectric and Avionics Listers, I know that there are many
> technically smart people on these lists and I would like to enlist your
> assistance.
>
> Picture this situation: There are hundreds (maybe thousands) of EAB
> (Experimental Amateur Built) IFR capable aircraft flying around with vacu
um
> driven mechanical spinning mass gyroscopic attitude and directional
> indicators. A large percentage of these builders and pilots would like to
> (or need to) replace those indicators with something electronic (other th
an
> expensive electrical motor driven mechanical spinning mass gyroscopic) in
> nature and remove the entire vacuum system from their EAB.
>
> Replacing the attitude indicator does not appear to be a big problem in
> meeting the requirement of 14 CFR 91.205 (d) (8) =9CGyroscopic pitc
h and bank
> indicator (artificial horizon)=9D since there are several offerings
> available. Here are some:
>
> http://www.dynonavionics.com/docs/D6_intro.html
>
> http://trutrakap.com/product/gemini-pfd/
>
> http://www.grtavionics.com/mini.html
>
> http://www.sandia.aero/?q=node/80
>
> But there does not appear to be available an electronic directional
> indicator that would meet the 14 CFR 91.205 (d) (9) criteria for a
> =9CGyroscopic directional indicator (directional gyro or equivalent
)=9D if one
> believes that the Regulatory intended direction to be indicated must inde
ed
> be the current aircraft magnetic heading and not the current aircraft
> magnetic course (provided by GPS) over the surface.
>
> I feel that somewhere in the electronic magic that MEMS
>
> << https://www.memsnet.org/mems/what_is.html >>
>
> and AHARS
>
> <<
> http://www.microstrain.com/inertial/3DM-GX3-25?gclid=CjgKEAjw2dqcBRC2q-
LXjpfxjnQSJAAeYF5LUC4gvWycBVg6DDW_mzzSdTyyF3q0yoQHrT6ij9VbvvD_BwE
> >>
>
> represents there must be a practical, relatively inexpensive means of
> creating a direction indicator that will meet the intended requirements o
f
> 14 CFR 91.205 (d) (9). If so, I (and probably many others) would like to
> buy one for my EAB airplane.
>
> How about it experts (and entrepreneurs) are my desires hopeless and
> unrealistic?
>
> OC
>
> 'O C' Baker says "The best investment you can make is the effort to gathe
r
> and understand information."
>
>
> *
>
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www.matronics.com/Navigator?AeroElectric-List>
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>
> *
>
>
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