Today's Message Index:
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1. 05:42 AM - Re: Interesting thread on overvoltage event (MMiller)
2. 06:55 AM - Re: Audio Isolation Amplifier Boards (Robert L. Nuckolls, III)
3. 08:46 AM - FW: ADS-B and Transponder Antenna Radiation Concerns (William Hunter)
4. 11:51 AM - Re: ADS-B and Transponder Antenna Radiation Concerns (user9253)
5. 01:03 PM - Re: FW: ADS-B and Transponder Antenna Radiation Concerns (Kent or Jackie Ashton)
6. 07:14 PM - Matronics Internet Connectivity Upgrades April 17-18 2017 (Matt Dralle)
Message 1
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| Subject: | Re: Interesting thread on overvoltage event |
In a PM generator like the Rotax, frequency is not a function of the number of
coils in the stator, it's a function of the number of magnets in the rotor divided
by two. Divided by two because the magnets are installed in the rotor with
the poles alternating. Just look at the flux lines of one circuit. Two magnets
in series inducing a field through the laminated stator of two coils. The
two coils are connected in series with one of the coils "crossed" so the magnetic
effect is additive.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=468412#468412
Message 2
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| Subject: | Re: Audio Isolation Amplifier Boards |
At 10:47 PM 12/11/2016, you wrote:
><bob.nuckolls@aeroelectric.com>
>
>I've had some requests for the bare etched circuit board called out
>in the DIY amplifier
>project featured at http://tinyurl.com/hn28p2q Also for the
>lvwarn/aux battery manager
>project at http://tinyurl.com/6mvso29
I ordered a second batch of audio
and lv/abmm boards. There
are 4 audio boards and 1 lv/abmm
board left . . .
Email me directly if intereseted.
Bob . . .
Message 3
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| Subject: | FW: ADS-B and Transponder Antenna Radiation Concerns |
Hi All,
I am building a radio rack/shelf in a Velocity (fiberglass pusher) and I
am thinking of getting creative in the installation location of the
ADS-B and/or transponder antenna location so as to reduce antennae farms
under the airplane and the resultant drag.
I was considering mounting the transponder and/or ADS-B antenna upside
down under my newly built radio shelf that will be installed on top of
the =9Ccanard=9D in the =9Ccanard doghouse=9D.
In the Velocity pusher design, the =9Ccanard=9D is the front
wing of the airplane and the =9Cdoghouse=9D is the space
above the canard center section and it is essentially a large faring
that streamlines the airplane nose and fuselage to the canard. The
design is such that the canard mounts to the airplane in front of the
windshield and it is installed pretty much directly above the
pilot/copilot foot well (above the rudder pedals).
See attached picture of partially built radio shelf and this view is as
if you were looking down from the windshield to the top of the canard
center section (doghouse) and directly below this radio shelf would be
the pilot/copilot foot well and rudder pedals.
I could drill a hole in the aluminum shelf and install the antenna
(antennae) sticking straight down below the aluminum sheet metal and
that would require drilling a vertical hole straight down through the
canard skin and foam (making sure to avoid drilling through the canard
spar). That area of the canard is not considered to be a structural
component because the canard has a main spar and this is just a
fiberglass skin/foam core/skin sandwich construction. The antenna would
pretty much be completely inside the fuselage envelope and surrounded by
foam and fiberglass and the aluminum shelf would act as the ground
plane.
My electrical concerns are:
-Is having a high frequency transponder antenna mounted 24 inches above
my feet a good idea?
-The ADS-B antenna is a dual band receive only antenna so if I just went
with the ADS-B antenna mounted above my feet there would not be a
concern of irradiating my feet however the other concern would be the
interference of the metal rudder pedals and the metal control linkage
below the antenna interfering with its signal. Would that make the
ADS-B reception less sensitive?
Just some thoughts to ponder for the transponder.
THANKS!!!
Bill Hunter
Message 4
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| Subject: | Re: ADS-B and Transponder Antenna Radiation Concerns |
> Is having a high frequency transponder antenna mounted 24 inches above my feet
a good idea?
I do not know, but probably is a bad idea.
> Would that make the ADS-B reception less sensitive?
Yes, but probably not significantly. I would install the receiving antenna wherever
you want, then try it out. You can always move it if necessary.
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=468431#468431
Message 5
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| Subject: | Re: FW: ADS-B and Transponder Antenna Radiation Concerns |
> On Apr 15, 2017, at 11:14 AM, William Hunter <billhuntersemail@gmail.com> wrote:
>
>
> I was considering mounting the transponder and/or ADS-B antenna upside down under
my newly built radio shelf that will be installed on top of the canard in
the canard doghouse.
>
The transponder antenna must have line-of-sight to the radar station with no engines,
avionics or people (bags of water) in between. When departing a radar
station at say 5000 AGL and 25 NM, the look angle from the airplane to the station
is only about 2 degrees down so the antenna almost has to go on the bottom
of the airplane.
Even fiberglass builders who mount them in the nose have problems keeping radar
contact on departure. A 2 degree angle of attack and 1 degree climb angle puts
the passengers between the antenna and the radar station.
It is fine to mount the antenna under your seat or under your feet. The transmit
pulse is so brief that it has negligible effect. My ground plane in under
the seat and the antenna sticks out the bottom of the airplane.
-Kent
Message 6
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| Subject: | Matronics Internet Connectivity Upgrades April 17-18 |
2017
Dear Matronics Email List an/or Forum User,
The Matronics Internet connectivity will be upgraded on April 17 through April
18, 2017. During the upgrade connections to the Matronics and AeroElectric web
servers may be unavailable. Additionally, Matronics Email List email will not
be redistributed.
Internet Connectivity bandwidth will be significantly increased by a factor of
7X for downloads and 50X for uploads, which represents a significant increase
in performance. Reliability should also increase in terms.
I will send out a follow up message when the upgrade has been completed.
Best Regards,
Matt Dralle
Matronics Email List and Forum Admin.
Matt G Dralle | Matronics | 581 Jeannie Way | Livermore | CA | 94550
925-606-1001 V | 925-606-6281 F | dralle@matronics.com Email
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