Today's Message Index:
----------------------
1. 02:06 AM - Re: Electrical System Gremlin (Tom & Cathy Ervin)
2. 06:18 AM - Re: Filter inductor question (Robert L. Nuckolls, III)
3. 07:00 AM - Trim wiring (Fergus Kyle)
4. 07:43 AM - Re: Trim wiring (Michel Therrien)
5. 07:44 AM - Power trivia (Gary Casey)
6. 08:34 AM - Re: Trim wiring (Mark Phillips)
7. 09:29 AM - RG400 (Fergus Kyle)
8. 09:58 AM - Re: Filter inductor question (Gilles.Thesee)
9. 10:15 AM - Re: Electrical System Gremlin (Robert L. Nuckolls, III)
10. 10:15 AM - Matronics ISP Upgrade TODAY... (Matt Dralle)
11. 11:04 AM - Re: RG400 Opps, forgot the link (Robert L. Nuckolls, III)
12. 11:04 AM - Re: RG400 (Robert L. Nuckolls, III)
13. 11:47 AM - wiring diagram (Jones, Michael)
14. 12:54 PM - Garmin 196 and DB up/download (Werner Schneider)
15. 03:16 PM - Re: Landing Light - on e-buss or main buss??? (Shannon Knoepflein)
16. 04:00 PM - Re: Electrical System Gremlin (Tom & Cathy Ervin)
17. 04:10 PM - Re: Electrical System Gremlin (Tom & Cathy Ervin)
18. 07:43 PM - Re: Landing Light - on e-buss or main (Robert L. Nuckolls, III)
19. 07:43 PM - Re: Landing Light - on e-buss or main (Robert L. Nuckolls, III)
20. 07:48 PM - Re: Filter inductor question (Robert L. Nuckolls, III)
21. 08:30 PM - Re: Landing Light - on e-buss or main buss??? (Shannon Knoepflein)
22. 10:05 PM - Re: Landing Light - on e-buss or main buss??? (Jerzy Krasinski)
Message 1
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| Subject: | Re: Electrical System Gremlin |
--> AeroElectric-List message posted by: "Tom & Cathy Ervin" <tcervin@valkyrie.net>
Bob, The antenna's are on the belly of the plane. Other possible
contributors to my problem may be:
1) I am transmitting in a 24 x 52 garage
2) Forward top skin over the panel is off.
I still need to find out why my Amp. Gauge shows about a 10-12 Amp.
discharge when the Master Switch is thrown and every other circuit is still
off including the radio's. This is probably unrelated to the RF problem?
Thanks for any help. Tom in Ohio
----- Original Message -----
From: "Robert L. Nuckolls, III" <bob.nuckolls@cox.net>
Subject: Re: AeroElectric-List: Electrical System Gremlin
> --> AeroElectric-List message posted by: "Robert L. Nuckolls, III"
<bob.nuckolls@cox.net>
>
> At 08:09 PM 3/30/2003 -0500, you wrote:
> >--> AeroElectric-List message posted by: "Tom & Cathy Ervin"
> ><tcervin@valkyrie.net>
> >
> > Just finished up all the Electrics on my RV6-A in the Hanger (garage)
> > out back and have a small Gremlin. Everything works including transmit
> > and receiving on both Comm's.
> > Symptoms are as follows after turning on the Master:
> > 1) About a 15 Amp. discharge shown on the Amp.
Gauge
> > with only the Oil Pressure Light and BC Regulator Charge light
activated?
> > 2) Everything works with no more discharge shown no
> > matter how many things are brought online?
> > 3) Now it gets interesting........If I transmit on
> > either radio the following occurs:
> > a) CHT & EXT Gauges dance like crazy!
> > b) Amp Gauge goes Nuts!
> > c) Flap & Trim Indicators leds dance!
> > d) Fuel gauges advance very slightly even
> > though the wings and thus indicators are not hooked up?
> > The airport which is 3 miles away says I am transmitting
> > crystal clear even from inside my garage with a belly antenna?!?
> > Any suggestions of where to start looking would be appreciated as
I
> > don't want to put the forward skin down till I get this fixed.
>
> sounds like an RF interference problem . . . had another
> builder with similar situation just a week ago. Where
> are your antennas located?
>
> Bob . . .
>
>
Message 2
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| Subject: | Re: Filter inductor question |
--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <bob.nuckolls@cox.net>
At 09:46 AM 4/1/2003 +0200, you wrote:
>--> AeroElectric-List message posted by: "Gilles.Thesee"
><Gilles.Thesee@ac-grenoble.fr>
>
>
>Bob,
>Thanks for the responding.
>
>
> >
> > I measured one on the bench and it comes out to about 1 Millihenry
> > and is wound with 22AWG wire which gives it a current rating on the
> > order of 2A or so.
> >
>
>Is it in the form of a strait coil, or some torroidal affair ?
Any inductor with the right characteristics will do. The 270-030
particular part is wound on E-I laminations stacked
all one direction with an air-gap.
Bob . . .
Message 3
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--> AeroElectric-List message posted by: "Fergus Kyle" <VE3LVO@rac.ca>
"They recommend a 1A fuse for the indicator and an 1A
fuse for the servo. I checked how much current these
devices are taking and elected to use a single 1A fuse
for both of them. "
Cheers,
Let us remember that fuses protect the wiring...........
Ferg
Message 4
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--> AeroElectric-List message posted by: Michel Therrien <mtherr@yahoo.com>
Exactly. That's why I thought that if a 1A fuse
protects adequately all the wires of either the servo
and the indicator and both units together take less
than 1/2A (I don't remember what measurement I made),
I was more than safe enough.
--- Fergus Kyle <VE3LVO@rac.ca> wrote:
> --> AeroElectric-List message posted by: "Fergus
> Kyle" <VE3LVO@rac.ca>
>
> Cheers,
> Let us remember that fuses protect the
> wiring...........
> Ferg
http://platinum.yahoo.com
Message 5
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--> AeroElectric-List message posted by: "Gary Casey" <glcasey@adelphia.net>
<<Further, since the e-bus (in the architectures I have been looking at,
like
z-11) is fed by a diode, the more power you run through it, the more power
it dissipates. This might be a minor issue, but I think its worth
considering.
Once you have a 8A (100W) light turned on, you are burning an additional
4.8W (8A*0.6V) just running it through the diode. I think 4W will keep
the main
bus contactor closed.>>
A little trivial, but adding a diode in series with a light will make the
total power consumption go down, not up. The diode drop lowers the actual
voltage at the light, reducing the current draw, but not in direct
proportion to the voltage drop. The reason is that the reduced voltage will
lower the filament temperature, reducing its resistance slightly. The power
dissipated in the diode is power that would have been dissipated at the
light if the diode weren't there. Other types of loads behave differently.
Gary Casey
Message 6
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--> AeroElectric-List message posted by: Mark Phillips <ripsteel@edge.net>
Plus, if your trim indicator goes blank, you know you've lost your trim....
From The PossumWorks
Mark
>
> Exactly. That's why I thought that if a 1A fuse
> protects adequately all the wires of either the servo
> and the indicator and both units together take less
> than 1/2A (I don't remember what measurement I made),
> I was more than safe enough.
Message 7
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--> AeroElectric-List message posted by: "Fergus Kyle" <VE3LVO@rac.ca>
Bob,
I have lots of experience with RG-8 and RG-58, etc. but none
with the RG400 which has two coax screens. Now that I'm connecting the coax
to antenna elements (by the usual 'picking' coax screen to get at insulator
and central wire), can you please tell me how to connect each screen?
That is one, both or either to ground element?
Thanks, ferg
Message 8
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| Subject: | Re: Filter inductor question |
--> AeroElectric-List message posted by: "Gilles.Thesee" <Gilles.Thesee@ac-grenoble.fr>
> Any inductor with the right characteristics will do. The 270-030
> particular part is wound on E-I laminations stacked
> all one direction with an air-gap.
>
> Bob . . .
Thanks once more Bob,
Ahem, still another question....
I'm unable to locate a 1N4744 Zener diode in this part of the world. I
understand it is a 15 V, 1 watt zener.
But we have lots of 15 V, 1.3 watt or even 5 watt Zener diodes (1N5352B).
Will that do for the filter ? Maybe a single 5 watt Zener will be up to the
job ?
This is hopefully my last question since I found a suitable capacitor ;-)
Thank you,
Gilles
Message 9
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| Subject: | Re: Electrical System Gremlin |
--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <bob.nuckolls@cox.net>
At 05:01 AM 4/1/2003 -0500, you wrote:
>--> AeroElectric-List message posted by: "Tom & Cathy Ervin"
><tcervin@valkyrie.net>
>
>Bob, The antenna's are on the belly of the plane. Other possible
>contributors to my problem may be:
> 1) I am transmitting in a 24 x 52 garage
> 2) Forward top skin over the panel is off.
I wouldn't expect instruments to be that sensitive
to RF with the amount of isolation you seem to have.
What brand and model numbers of affected instruments
are we talking about?
>I still need to find out why my Amp. Gauge shows about a 10-12 Amp.
>discharge when the Master Switch is thrown and every other circuit is still
>off including the radio's. This is probably unrelated to the RF problem?
I suspect this is the case. If you have an ammeter that
shows "discharge" I presume your system architecture is
something other than one of those illustrated in
Appendix-Z?
Bob . . .
Message 10
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| Subject: | Matronics ISP Upgrade TODAY... |
--> AeroElectric-List message posted by: Matt Dralle <dralle@matronics.com>
Dear Listers,
The time has finally arrived for the Internet Service Provider (ISP)
upgrade! You'll recall that I was looking into upgrading the existing SDSL
connection from 768k to 1.1M. As it turned out, the copper line wouldn't
support any speeds greater than the current 768k. In light of that news, I
just bit-the-bullet and ordered a full, commercial-grade T1
connection. The T1 connection will provide a full-duplex, high priority,
1.5Mb Internet connection which should be a substantial performance
enhancement for all of the List services!
Pacbell delivered the T1 Loop last week and it tested out fine. This past
weekend I pulled the tail circuit from the demark to the office. This
afternoon, Tuesday 4/1/03, the ISP is suppose come and install the new
router and bring up routing on a test subnet. Assuming that everything
checks out okay with the T1, new router, and routing, I will have them
swing the main Matronics subnet off the SDSL and onto the T1. In theory,
the swing could be nearly transparent to users, but that's usually not the
case... ;-)
Please expect a bit of instability in connectivity this afternoon as we
work though the transition issues. I will post a follow up message when
everything is up and running on the new T1 line.
Finally, please know that it is solely your Contributions that make these
kinds of List upgrades happen! There is no advertising budget (aka,
flashing banner ads and annoying pop up browser windows) to pay these
bills; operational support is solely from List members like you during the
yearly List Fund Raiser. If you would like to make your Contribution to
support the Lists and upgrades like this T1 connectivity enhancement,
please see the List Contribution Web Site where you can make your
Contribution with a Credit Card, PayPal, or Personal Check. You can even
get a free List Archive CDROM with a qualifying List Contribution! The URL
is: http://www.matronics.com/contribution
Thanks again to EVERYONE that made a generous Contribution last year and
enabled this awesome upgrade to T1 service!
Matt Dralle
Matronics Email List Admin.
Matt G Dralle | Matronics | PO Box 347 | Livermore | CA | 94551
925-606-1001 V | 925-606-6281 F | dralle@matronics.com Email
http://www.matronics.com/ WWW | Featuring Products For Aircraft
Message 11
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| Subject: | Re: RG400 Opps, forgot the link |
--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <bob.nuckolls@cox.net>
At 12:32 PM 4/1/2003 -0500, you wrote:
>--> AeroElectric-List message posted by: "Fergus Kyle" <VE3LVO@rac.ca>
>
>Bob,
> I have lots of experience with RG-8 and RG-58, etc. but none
>with the RG400 which has two coax screens. Now that I'm connecting the coax
>to antenna elements (by the usual 'picking' coax screen to get at insulator
>and central wire), can you please tell me how to connect each screen?
> That is one, both or either to ground element?
Treat them as a single shield. Insulation is sufficiently
heat resistant to soldering shield end directly to antenna
element.
Here's a series of photos I did for a Shop Notes posting
that I've not yet taken time to post.
http://www.aeroelectric.com/temp/Antenna
Bob . . .
Message 12
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--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <bob.nuckolls@cox.net>
At 12:32 PM 4/1/2003 -0500, you wrote:
>--> AeroElectric-List message posted by: "Fergus Kyle" <VE3LVO@rac.ca>
>
>Bob,
> I have lots of experience with RG-8 and RG-58, etc. but none
>with the RG400 which has two coax screens. Now that I'm connecting the coax
>to antenna elements (by the usual 'picking' coax screen to get at insulator
>and central wire), can you please tell me how to connect each screen?
> That is one, both or either to ground element?
Treat them as a single shield. Insulation is sufficiently
heat resistant to soldering shield end directly to antenna
element.
Here's a series of photos I did for a Shop Notes posting
that I've not yet taken time to post.
Bob . . .
Message 13
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--> AeroElectric-List message posted by: "Jones, Michael" <MJones@hatch.ca>
hi bob
attached is pdf of wiring diagram for all electric airplane as you have
shown on your web site. i have your load/voltmeter on order wit westach and
was hoping you could have look at how the two switches are show to allow
switching between main and backup bus.
mike
<<rebel007-schematic.pdf>>
Message 14
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| Subject: | Garmin 196 and DB up/download |
--> AeroElectric-List message posted by: "Werner Schneider" <wernerschneider@compuserve.com>
Hello "Neters",
I have a question about the Garmin 196, I like the GPS, I'm living in Europe
and my main use would be here. Now I love to go to Australia from time to
time and to some intensive flying over there.
As I can upload a new Database into the Garmin, this seems not to be a
problem, but, can I download the European (Atlantic) version first, then
upload the Australia (Pacific) database and when I'm coming back from my
holidays do it the other way round? What program do I need? Yes, I know, I
could have a plugable datacard, but is there a way without it?
Many thanks for your help
Werner
Message 15
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| Subject: | Landing Light - on e-buss or main buss??? |
--> AeroElectric-List message posted by: "Shannon Knoepflein" <kycshann@kyol.net>
On the note of a diode, I would like to highly recommend Eric Jones
Superdiode that he supplied to me. I have these units feeding my two
avionics busses, one of which is the E-bus, in my z-14 style system. I
powered the panel up for the first time this weekend (pictures to
follow), and I'm happy to report a very small voltage drop across these
diodes. I don't have hard numbers in front of me (will get later during
final assembly), but it was much less than the standard .6 or .7, on the
order of .2 or .3 I believe. This is significant. Thanks Eric.
---
Shannon Knoepflein <---> kycshann@kyol.net
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Matt
Prather
Subject: Re: AeroElectric-List: Landing Light - on e-buss or main
buss???
--> AeroElectric-List message posted by: "Matt Prather"
<mprather@spro.net>
I would put the landing light onto the main bus because it will only be
used during the final portions of the approach, by which time the main
bus can be re-lit. The battery WILL have the capacity to power
everything you need for the few minutes that you are on approach
because you designed your airplane to have more battery than gasoline,
right?
The e(ndurance)-bus is designed to have only the minimum equipment
required for long distance flight on your remaining power source. The
landing
light doesn't fit into the category of things that are needed for
endurance. The
goal of the e-bus is to turn off everything but the things required to
keep the
wings upright, stay on course, and be able to tell someone about it.
Further, since the e-bus (in the architectures I have been looking at,
like
z-11) is fed by a diode, the more power you run through it, the more
power
it dissipates. This might be a minor issue, but I think its worth
considering.
Once you have a 8A (100W) light turned on, you are burning an additional
4.8W (8A*0.6V) just running it through the diode. I think 4W will keep
the main
bus contactor closed.
Matt-
N34RD
> --> AeroElectric-List message posted by: Julia <wings97302@yahoo.com>
>
>
> Bob:
>
> If I remember correctly you put the landing light on the Main buss -
> rather than on the E-bus. Wouldn't it be good to be able to turn it
on
> when landing at night?? If it appeared to be killing my bat. then I
> could flip it off again and land without it - but if I had enough
juise
> in the bat. why not make it so I could use it??
>
>
Message 16
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| Subject: | Re: Electrical System Gremlin |
--> AeroElectric-List message posted by: "Tom & Cathy Ervin" <tcervin@valkyrie.net>
----- Original Message -----
From: "Robert L. Nuckolls, III" <bob.nuckolls@cox.net>
Subject: Re: AeroElectric-List: Electrical System Gremlin
> --> AeroElectric-List message posted by: "Robert L. Nuckolls, III"
<bob.nuckolls@cox.net>
>
> At 05:01 AM 4/1/2003 -0500, you wrote:
> >--> AeroElectric-List message posted by: "Tom & Cathy Ervin"
> ><tcervin@valkyrie.net>
> >
> >Bob, The antenna's are on the belly of the plane. Other possible
> >contributors to my problem may be:
> > 1) I am transmitting in a 24 x 52 garage
> > 2) Forward top skin over the panel is off.
>
> I wouldn't expect instruments to be that sensitive
> to RF with the amount of isolation you seem to have.
> What brand and model numbers of affected instruments
> are we talking about?
>
>
> >I still need to find out why my Amp. Gauge shows about a 10-12 Amp.
> >discharge when the Master Switch is thrown and every other circuit is
still
> >off including the radio's. This is probably unrelated to the RF problem?
>
> I suspect this is the case. If you have an ammeter that
> shows "discharge" I presume your system architecture is
> something other than one of those illustrated in
> Appendix-Z?
>
> Bob . . .
>
>
Message 17
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| Subject: | Re: Electrical System Gremlin |
--> AeroElectric-List message posted by: "Tom & Cathy Ervin" <tcervin@valkyrie.net>
Bob, All gauges are from Van's but look very similar including the shunt
to Isspro Gauges handled by Chief Aircraft in Or. The Flap and Trim
Indicators are made by Ray Allen being the only other items effected.
Sadly the architecture is a lot like a Cessna with breakers etc.
but I do have a B&C Aternator and Regulator.
Tom in Ohio
----- Original Message -----
From: "Robert L. Nuckolls, III" <bob.nuckolls@cox.net>
Subject: Re: AeroElectric-List: Electrical System Gremlin
> --> AeroElectric-List message posted by: "Robert L. Nuckolls, III"
<bob.nuckolls@cox.net>
>
> At 05:01 AM 4/1/2003 -0500, you wrote:
> >--> AeroElectric-List message posted by: "Tom & Cathy Ervin"
> ><tcervin@valkyrie.net>
> >
> >Bob, The antenna's are on the belly of the plane. Other possible
> >contributors to my problem may be:
> > 1) I am transmitting in a 24 x 52 garage
> > 2) Forward top skin over the panel is off.
>
> I wouldn't expect instruments to be that sensitive
> to RF with the amount of isolation you seem to have.
> What brand and model numbers of affected instruments
> are we talking about?
>
>
> >I still need to find out why my Amp. Gauge shows about a 10-12 Amp.
> >discharge when the Master Switch is thrown and every other circuit is
still
> >off including the radio's. This is probably unrelated to the RF problem?
>
> I suspect this is the case. If you have an ammeter that
> shows "discharge" I presume your system architecture is
> something other than one of those illustrated in
> Appendix-Z?
>
> Bob . . .
>
>
Message 18
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| Subject: | Landing Light - on e-buss or main |
buss???
--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <bob.nuckolls@cox.net>
At 06:11 PM 4/1/2003 -0500, you wrote:
>--> AeroElectric-List message posted by: "Shannon Knoepflein"
><kycshann@kyol.net>
>
>On the note of a diode, I would like to highly recommend Eric Jones
>Superdiode that he supplied to me. I have these units feeding my two
>avionics busses, one of which is the E-bus, in my z-14 style system. I
>powered the panel up for the first time this weekend (pictures to
>follow), and I'm happy to report a very small voltage drop across these
>diodes. I don't have hard numbers in front of me (will get later during
>final assembly), but it was much less than the standard .6 or .7, on the
>order of .2 or .3 I believe. This is significant. Thanks Eric.
Actually, it's not very significant . . . we've discussed this
at length numerous times. None-the-less, Eric's product does
produce about 1/2 the heat of the silicon junction devices.
Given that the e-bus continuous loads on most aircraft are on
the order of 2-5A, this means that loss of 1.5 to 3.5 watts in
a 560 to 840 watt system can be reduced to 0.4 to 1.5 watts . . .
a battery contactor tosses about 10 watts . . . and it too
is no big deal.
On the voltage side, consider that the whole reason for
the e-bus is to insure second-path, battery-power during
alternator and/or contactor failures. Batteries DELIVER
energy at 12.5 to 10.5 volts. The only time the e-bus
carries current is when the alternator is running . . .
the bus should be 13.8 to 14.6 volts. Assuming a 0.7
volt drop, the MINIMUM voltage on the e-bus during normal
ops is 13.1 volts . . . about 0.6 volts higher than
you'll get battery-only. If you expect your e-bus
powered goodies to perform well at 12.5 and below,
13.1 and above should be okay too.
I considered Schottky diodes in early days of e-bus
evolution. After considering the cost of having
to package a device (like Eric's product) against
ease of use for an off-the-shelf silicon bridge
rectifier, it seemed like a no-brainer decision.
Bob . . .
Message 19
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| Subject: | Landing Light - on e-buss or main |
buss???
--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <bob.nuckolls@cox.net>
At 06:11 PM 4/1/2003 -0500, you wrote:
>--> AeroElectric-List message posted by: "Shannon Knoepflein"
><kycshann@kyol.net>
>
>On the note of a diode, I would like to highly recommend Eric Jones
>Superdiode that he supplied to me. I have these units feeding my two
>avionics busses, one of which is the E-bus, in my z-14 style system. I
>powered the panel up for the first time this weekend (pictures to
>follow), and I'm happy to report a very small voltage drop across these
>diodes. I don't have hard numbers in front of me (will get later during
>final assembly), but it was much less than the standard .6 or .7, on the
>order of .2 or .3 I believe. This is significant. Thanks Eric.
Actually, it's not very significant . . . we've discussed this
at length numerous times. None-the-less, Eric's product does
produce about 1/2 the heat of the silicon junction devices.
Given that the e-bus continuous loads on most aircraft are on
the order of 2-5A, this means that loss of 1.5 to 3.5 watts in
a 560 to 840 watt system can be reduced to 0.4 to 1.5 watts . . .
a battery contactor tosses about 10 watts . . . and it too
is no big deal.
On the voltage side, consider that the whole reason for
the e-bus is to insure second-path, battery-power during
alternator and/or contactor failures. Batteries DELIVER
energy at 12.5 to 10.5 volts. The only time the e-bus
carries current is when the alternator is running . . .
the bus should be 13.8 to 14.6 volts. Assuming a 0.7
volt drop, the MINIMUM voltage on the e-bus during normal
ops is 13.1 volts . . . about 0.6 volts higher than
you'll get battery-only. If you expect your e-bus
powered goodies to perform well at 12.5 and below,
13.1 and above should be okay too.
I considered Schottky diodes in early days of e-bus
evolution. After considering the cost of having
to package a device (like Eric's product) against
ease of use for an off-the-shelf silicon bridge
rectifier, it seemed like a no-brainer decision.
Bob . . .
Message 20
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| Subject: | Re: Filter inductor question |
--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <bob.nuckolls@cox.net>
At 07:56 PM 4/1/2003 +0200, you wrote:
>--> AeroElectric-List message posted by: "Gilles.Thesee"
><Gilles.Thesee@ac-grenoble.fr>
>
> > Any inductor with the right characteristics will do. The 270-030
> > particular part is wound on E-I laminations stacked
> > all one direction with an air-gap.
> >
> > Bob . . .
>
>Thanks once more Bob,
>
>Ahem, still another question....
>I'm unable to locate a 1N4744 Zener diode in this part of the world. I
>understand it is a 15 V, 1 watt zener.
>But we have lots of 15 V, 1.3 watt or even 5 watt Zener diodes (1N5352B).
>Will that do for the filter ? Maybe a single 5 watt Zener will be up to the
>job ?
That would do fine. I like the 1W glass devices because
they fail shorted rather quickly and do a sort of one-part
crowbar effort against the fuse (you ARE using a fuse
to feed this thing?). I've not tested a larger zener
but it's very likely to be a suitable substitute.
Bob . . .
Message 21
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| Subject: | Landing Light - on e-buss or main buss??? |
--> AeroElectric-List message posted by: "Shannon Knoepflein" <kycshann@kyol.net>
My point was I think that the devices that Eric is building are a step
in the right direction for OBAM aircraft (these include several solid
state relay devices in addition to the diodes). Also, considering
Eric's diode is the only one readily available that will handle the 20A
my one buss requires is significant.
As always, thanks for setting me straight and putting it all in
perspective. Your vast understanding in really incredible. Thanks.
Shannon
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of
Robert L. Nuckolls, III
Subject: RE: AeroElectric-List: Landing Light - on e-buss or main
buss???
--> AeroElectric-List message posted by: "Robert L. Nuckolls, III"
<bob.nuckolls@cox.net>
At 06:11 PM 4/1/2003 -0500, you wrote:
>--> AeroElectric-List message posted by: "Shannon Knoepflein"
><kycshann@kyol.net>
>
>On the note of a diode, I would like to highly recommend Eric Jones
>Superdiode that he supplied to me. I have these units feeding my two
>avionics busses, one of which is the E-bus, in my z-14 style system. I
>powered the panel up for the first time this weekend (pictures to
>follow), and I'm happy to report a very small voltage drop across these
>diodes. I don't have hard numbers in front of me (will get later
during
>final assembly), but it was much less than the standard .6 or .7, on
the
>order of .2 or .3 I believe. This is significant. Thanks Eric.
Actually, it's not very significant . . . we've discussed this
at length numerous times. None-the-less, Eric's product does
produce about 1/2 the heat of the silicon junction devices.
Given that the e-bus continuous loads on most aircraft are on
the order of 2-5A, this means that loss of 1.5 to 3.5 watts in
a 560 to 840 watt system can be reduced to 0.4 to 1.5 watts . . .
a battery contactor tosses about 10 watts . . . and it too
is no big deal.
On the voltage side, consider that the whole reason for
the e-bus is to insure second-path, battery-power during
alternator and/or contactor failures. Batteries DELIVER
energy at 12.5 to 10.5 volts. The only time the e-bus
carries current is when the alternator is running . . .
the bus should be 13.8 to 14.6 volts. Assuming a 0.7
volt drop, the MINIMUM voltage on the e-bus during normal
ops is 13.1 volts . . . about 0.6 volts higher than
you'll get battery-only. If you expect your e-bus
powered goodies to perform well at 12.5 and below,
13.1 and above should be okay too.
I considered Schottky diodes in early days of e-bus
evolution. After considering the cost of having
to package a device (like Eric's product) against
ease of use for an off-the-shelf silicon bridge
rectifier, it seemed like a no-brainer decision.
Bob . . .
Message 22
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| Subject: | Re: Landing Light - on e-buss or main buss??? |
--> AeroElectric-List message posted by: Jerzy Krasinski <krasinski@direcway.com>
Schottky diodes for 20A are in fact quite common, but not in Radio
Shack. Check www.digikey.com. Search for International Rectifier
Schottky rectifiers. You will find at least a hundred of different
Schottky diodes with max current anywhere between 20A and 400A.
The diodes between 20A and 40A cost roughly between $1 and $3, depending
on voltage . Those good for 40A to 80A cost anywhere between $3 and $10.
Digikey accepts telephone or email orders.
Jerzy
Shannon Knoepflein wrote:
>--> AeroElectric-List message posted by: "Shannon Knoepflein" <kycshann@kyol.net>
>
>My point was I think that the devices that Eric is building are a step
>in the right direction for OBAM aircraft (these include several solid
>state relay devices in addition to the diodes). Also, considering
>Eric's diode is the only one readily available that will handle the 20A
>my one buss requires is significant.
>
>As always, thanks for setting me straight and putting it all in
>perspective. Your vast understanding in really incredible. Thanks.
>
>Shannon
>
>-----Original Message-----
>From: owner-aeroelectric-list-server@matronics.com
>[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of
>Robert L. Nuckolls, III
>To: aeroelectric-list@matronics.com
>Subject: RE: AeroElectric-List: Landing Light - on e-buss or main
>buss???
>
>--> AeroElectric-List message posted by: "Robert L. Nuckolls, III"
><bob.nuckolls@cox.net>
>
>At 06:11 PM 4/1/2003 -0500, you wrote:
>
>
>>--> AeroElectric-List message posted by: "Shannon Knoepflein"
>><kycshann@kyol.net>
>>
>>On the note of a diode, I would like to highly recommend Eric Jones
>>Superdiode that he supplied to me. I have these units feeding my two
>>avionics busses, one of which is the E-bus, in my z-14 style system. I
>>powered the panel up for the first time this weekend (pictures to
>>follow), and I'm happy to report a very small voltage drop across these
>>diodes. I don't have hard numbers in front of me (will get later
>>
>>
>during
>
>
>>final assembly), but it was much less than the standard .6 or .7, on
>>
>>
>the
>
>
>>order of .2 or .3 I believe. This is significant. Thanks Eric.
>>
>>
>
> Actually, it's not very significant . . . we've discussed this
> at length numerous times. None-the-less, Eric's product does
> produce about 1/2 the heat of the silicon junction devices.
> Given that the e-bus continuous loads on most aircraft are on
> the order of 2-5A, this means that loss of 1.5 to 3.5 watts in
> a 560 to 840 watt system can be reduced to 0.4 to 1.5 watts . . .
> a battery contactor tosses about 10 watts . . . and it too
> is no big deal.
>
> On the voltage side, consider that the whole reason for
> the e-bus is to insure second-path, battery-power during
> alternator and/or contactor failures. Batteries DELIVER
> energy at 12.5 to 10.5 volts. The only time the e-bus
> carries current is when the alternator is running . . .
> the bus should be 13.8 to 14.6 volts. Assuming a 0.7
> volt drop, the MINIMUM voltage on the e-bus during normal
> ops is 13.1 volts . . . about 0.6 volts higher than
> you'll get battery-only. If you expect your e-bus
> powered goodies to perform well at 12.5 and below,
> 13.1 and above should be okay too.
>
> I considered Schottky diodes in early days of e-bus
> evolution. After considering the cost of having
> to package a device (like Eric's product) against
> ease of use for an off-the-shelf silicon bridge
> rectifier, it seemed like a no-brainer decision.
>
>
> Bob . . .
>
>
>
>
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