Today's Message Index:
----------------------
1. 05:01 AM - Re: Contactor orientation (racerjerry)
2. 07:11 AM - Re: Can Someone PLEASE Double Check My Homework?!?!?! (user9253)
3. 07:39 AM - Re: Re: Can Someone PLEASE Double Check My Homework?!?!?! (William Hunter)
4. 08:16 AM - Re: Re: Contactor orientation (Jim Baker)
5. 09:13 AM - Transponder antenna (Steve Kelly)
6. 09:40 AM - Re: Transponder antenna (Robert L. Nuckolls, III)
7. 11:32 AM - breaker as switch for aux alternator? (Ken Ryan)
8. 01:27 PM - Re: Re: Contactor orientation (Jim Baker)
9. 01:46 PM - Re: Transponder antenna (Peter Pengilly)
10. 06:58 PM - Re: Transponder antenna (Steve Kelly)
Message 1
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| Subject: | Re: Contactor orientation |
Jim Baker, the CPA contactor article you are looking for appeared in the April
2015 issue of their magazine.
--------
Jerry King
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=458217#458217
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| Subject: | Re: Can Someone PLEASE Double Check My Homework?!?!?! |
> what Pole do I connect the bus tie switch grounding wire to?
The small right terminal that only has one diode connected to it. Notice that
the banded end of the diode does NOT connect to the small right terminal.
Also notice that in the picture that Bob posted,
http://www.bandc.aero/pdfs/S701-2_Wiring.pdf
that there are 3 diodes and each banded end is connected to the small left terminal.
Bill, your picture is not very clear, but it looks like one of the 3 diodes
is missing and is replaced with a plain jumper wire. If so, something bad
will happen.
> it does not matter what side of the relay is the power side and what side goes
to the starter motor... is this correct?
Correct
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=458218#458218
Message 3
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| Subject: | Re: Can Someone PLEASE Double Check My Homework?!?!?! |
>Notice that the banded end of the diode does NOT connect to the small
right terminal.
Also notice that in the picture that Bob posted...
that there are 3 diodes and each banded end is connected to the small left
terminal. Bill, your picture is not very clear, but it looks like one of
the 3 diodes is missing and is replaced with a plain jumper wire.
Sorry. Bad photo. Using a smartphone camera if the flash is on then some
items get washed out and if the flash is off then some items are not
visible. Then when I compress the photo it makes it worse.
Thanks for the confirmation and yes my bus tie contactor does indeed have 3
diodes as delivered.
Thanks to all of your help on this forum... when I flip the switch on my
electrical system for the first time... it will not have any of the smoke
escape from the wires!
Bill Hunter
On Jul 15, 2016 7:18 AM, "user9253" <fransew@gmail.com> wrote:
>
>
> > what Pole do I connect the bus tie switch grounding wire to?
> The small right terminal that only has one diode connected to it. Notice
> that the banded end of the diode does NOT connect to the small right
> terminal.
> Also notice that in the picture that Bob posted,
> http://www.bandc.aero/pdfs/S701-2_Wiring.pdf
> that there are 3 diodes and each banded end is connected to the small left
> terminal. Bill, your picture is not very clear, but it looks like one of
> the 3 diodes is missing and is replaced with a plain jumper wire. If so,
> something bad will happen.
>
> > it does not matter what side of the relay is the power side and what
> side goes to the starter motor... is this correct?
> Correct
>
> --------
> Joe Gores
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=458218#458218
>
>
Message 4
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| Subject: | Re: Contactor orientation |
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Message 5
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| Subject: | Transponder antenna |
I'm at that point where I need to install a transponder antenna on the bottom of
my fiberglass fuselage. Research shows differing opinions on several issues.
-Location, For a number of reasons I am limited to the area below the pilot/
copilot seats. Some say thats too close to your body. Some say it doesn't matter.
I have read that the radiation pattern from the antenna is horizontal and
in the shape of a donut. If this is true then under seat would seem to be a
good location. Also, since I need to add a ground plane, would this serve to
reflect any radiation?
-Ground plane, I have room for up to a 16" square ground plane. I am unsure
as to the size and shape. I have read that if it's round it has to be a certain
size, But don't know what that size is. It seems that size doesn't matter
as much if its square or octagonal. Also, should I make ground plane as large
as I have room for?
The antenna is just the standard post and ball from B&C.
Would appreciate any feedback, Steve
--------
Steve
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=458221#458221
Message 6
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| Subject: | Re: Transponder antenna |
At 11:09 AM 7/15/2016, you wrote:
>
>I'm at that point where I need to install a transponder antenna on
>the bottom of my fiberglass fuselage. Research shows differing
>opinions on several issues.
> -Location, For a number of reasons I am limited to the area below
> the pilot/ copilot seats. Some say thats too close to your body.
> Some say it doesn't matter.
It doesn't . . . there are no biological hazards associated
with proximity to the transponder antenna.
> I have read that the radiation pattern from the antenna is
> horizontal and in the shape of a donut.
Sort of . . . it's 'half a donut' . . .
Emacs!
If this is true then under seat would seem to be a good
location. Also, since I need to add a ground plane, would this serve
to reflect any radiation?
The ground plane is essential to antenna performance.
It it isn't provided by 'very large' surface areas
like the skin of a metal aircraft, . . .
> -Ground plane, I have room for up to a 16" square ground
> plane. I am unsure as to the size and shape. I have read that if
> it's round it has to be a certain size, But don't know what that
> size is. It seems that size doesn't matter as much if its square
> or octagonal. Also, should I make ground plane as large as I have room for?
The RADIUS of a minimal ground plane is equal to the
seated height of the associated antenna. For a transpoder,
this is 5.3" in diameter.
> The antenna is just the standard post and ball from B&C.
> Would appreciate any feedback, Steve
That would be my choice. See chapter 13 of
http://tinyurl.com/pt97pha
Bob . . .
Message 7
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| Subject: | breaker as switch for aux alternator? |
For a two alternator (alternator + generator) one battery system similar to
Z-13/8 where the generator is the auxiliary and is wired for over voltage
so the relay cuts the current TO the regulator (as in Z-16), would it be
acceptable to just use the 5 amp panel breaker as the on-off switch for the
auxiliary generator, rather than using a toggle switch? In this case the C
wire from the regulator would go directly to the main bus (the master
switch would be used for the main alternator field wire and battery
contactor).
I can't see why a push-pull breaker would not be adequate for activating
and deactivating the auxiliary generator. Normal use would be once on
startup to check that the auxiliary charging system is functional, and then
only in the event of a failure of the primary charging system during flight.
Message 8
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| Subject: | Re: Contactor orientation |
Well, that made it easy. Thanks!
Jim Baker
405 426 5377
-----Original Message-----
From: racerjerry <gnking2@verizon.net>
Sent: Fri, 15 Jul 2016 8:00
Subject: AeroElectric-List: Re: Contactor orientation
Jim Baker, the CPA contactor article you are looking for appeared in the April
2015 issue of their magazine.
--------
Jerry King
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=458217#458217
Message 9
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| Subject: | Transponder antenna |
The maths to figure the size of the ground plane are quite straight forward
when you know that speed of light = frequency x wavelength.
For a transponder 3 x 10^8 m/s = 1090 x 10^6 x wavelength
Wavelength = 3/10.9 = 0.275m (or 10.84")
Most antennas we use are 1/4 wave dipoles, the ground plane should be tuned
to the antenna, so the radius should 69mm, diameter 138mm (5.42").
Peter
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Steve
Kelly
Sent: 15 July 2016 17:10
Subject: AeroElectric-List: Transponder antenna
--> <amsk22@gmail.com>
I'm at that point where I need to install a transponder antenna on the
bottom of my fiberglass fuselage. Research shows differing opinions on
several issues.
-Location, For a number of reasons I am limited to the area below the
pilot/ copilot seats. Some say thats too close to your body. Some say it
doesn't matter. I have read that the radiation pattern from the antenna is
horizontal and in the shape of a donut. If this is true then under seat
would seem to be a good location. Also, since I need to add a ground plane,
would this serve to reflect any radiation?
-Ground plane, I have room for up to a 16" square ground plane. I am
unsure as to the size and shape. I have read that if it's round it has to
be a certain size, But don't know what that size is. It seems that size
doesn't matter as much if its square or octagonal. Also, should I make
ground plane as large as I have room for?
The antenna is just the standard post and ball from B&C.
Would appreciate any feedback, Steve
--------
Steve
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=458221#458221
Message 10
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| Subject: | Re: Transponder antenna |
Thank you. Those are the answers I was looking for.
Steve
--------
Steve
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=458227#458227
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