Today's Message Index:
----------------------
1. 03:23 AM - Re: Position Lights/Strobes (Stuart Hutchison)
2. 03:52 AM - Re: A refresher question about switching for the battery and "al (tomcostanza)
3. 04:25 AM - Re: A refresher question about switching for the battery and "alternator." (Andrew Zachar)
4. 06:53 AM - (Phil Hildebrand)
5. 07:16 AM - Re: (Ralph E. Capen)
6. 07:47 AM - Re: (Bruce)
7. 08:18 AM - Transponder Ground Plane (Phil Hildebrand)
8. 08:33 AM - Re: (Ralph E. Capen)
9. 08:34 AM - Re: Transponder Ground Plane (Ralph E. Capen)
10. 08:44 AM - Re: (John Grosse)
11. 08:47 AM - Re: Transponder Ground Plane (John Grosse)
12. 09:28 AM - Re: (Bruce)
13. 10:23 AM - Re: (Eric Tiethoff)
14. 11:28 AM - Re: (Ralph E. Capen)
15. 01:14 PM - 300mA AA NiMh charger design needed (rparigoris)
16. 09:23 PM - Re: Re: A refresher question about switching for the battery and "al (Robert L. Nuckolls, III)
17. 09:24 PM - Re: A refresher question about switching for the battery and "alternator." (Robert L. Nuckolls, III)
18. 09:25 PM - Re: (Robert L. Nuckolls, III)
19. 09:28 PM - Re: (Robert L. Nuckolls, III)
20. 09:34 PM - Re: (Robert L. Nuckolls, III)
21. 09:35 PM - Re: Transponder Ground Plane (Robert L. Nuckolls, III)
22. 09:47 PM - Re: 300mA AA NiMh charger design needed (Robert L. Nuckolls, III)
Message 1
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| Subject: | Position Lights/Strobes |
G'day Rick,
I liked the Aveo range and I already have several of their products, but I
wouldn't recommend them to anyone. If first sought sponsorship and the
answer was no, but I nevertheless went ahead and bought Aveo products
because I liked the gear. I then discovered a broken return wire in my new
AveoMaxx landing light module earlier this year. There was no strain relief
for the wires, no chafe protection where they passed through the anodised
metal body and no beam angle adjustment. There were also a raft of errors
and omissions in the advertising for the product itself and they refused to
honour the warranty when I said that I removed three ordinary screws holding
the lens in place (to see what was wrong). I expected a replacement light
because I had already cut my wingtips to suit the larger lights, but they
insisted a refund was the only option. I experienced one helpful,
constructive person at Aveo USA, but customer service at the decision-level
was abysmal and insulting.
Cheers, Stu
_____
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Rick Lark
Sent: Wednesday, September 28, 2011 6:28 AM
Subject: AeroElectric-List: Position Lights/Strobes
Hi all
I'm researching lighting options for my RV10 project. I've looked at Aveo
Leds, Aero Leds, Whelen, and Kuntzleman. The Aveo & Aero leds look like
great products but pricey. The Whelen products also look nice but again
pricey.
I'm leaning towards the Kuntzlemean package that has the 3 position lights
(led), with integrated Xe flash tubes, or a home made system which, when you
add all the componets up, starts to approach the Kuntzleman price of $620.
The homemade system also carries a posible issue with the LED position
lights not having the proper 110/140 degree beams.
My goal is to have red, green and white led position lights, and 3 strobes
with at least the wing tips strobes synchronized.
Anyone have an opinion on Kuntzlemman products? Sounds like they've been
arounf for about 20 years, but I know nothing about them.
All opinions welcomed.
Rick
#40956
Southampton, Ont
Message 2
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| Subject: | Re: A refresher question about switching for the battery |
and "al
I would have thought that starting the engine on with the alternator field powered
would load the engine, not the alternator. And with a marginal battery, in
cold weather, it might make a difference as to whether the engine started or
not.
> One of the larger discussions is with reference to the split rocker: "1) Leave
the alternator switch OFF BEFORE starting the engine," and "2) Turn the alternator
switch ON AFTER the engine is running." Mr. Nuckolls responds to this by
pointing out there is "there is no demonstration in the physics of how alternators
workthat will support this notion...[that starting the engine with both
sides powered somehow overloads the alternator, causing failure.]" Okay. I understand.
--------
Clear Skies,
Tom Costanza
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=353396#353396
Message 3
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| Subject: | Re: A refresher question about switching for the battery |
and "alternator."
Thanks for your quick response, Mr. Nuckolls.
So I'll need a way to remove excitation current for battery only ops (either
crowbar cb or 3-position switch).
Makes sense. With one more question, I think I'll have my path. (Whoops! It
turned into two!)
Knowing that I won't damage anything while cranking with the excitation
current there, does a 3-position switch (so I can crank
without excitation current) help with cranking ability? (I guess the same
question goes for various other electrical equipment/avionics; I know
cranking with avionics ON won't hurt the avionics, but will turning
electrical equipment off during cranking provide better cranking
performance? I think we're talking 200 to 300 amps versus just a couple
amps...maybe I have more issues if those few extra amps are making a big
difference.)
Thanks again.
On Tue, Sep 27, 2011 at 4:59 PM, Robert L. Nuckolls, III <
nuckolls.bob@aeroelectric.com> wrote:
> At 01:50 PM 9/27/2011, you wrote:
> Good afternoon, everyone.
>
> <snip>
>
>
> Okay, so while I won't hurt the alternator by cranking with both sides
> powered, you shouldn't sit around (with the engine not running) with them
> both on for fun...
>
> * Correct. When the alternator field is ON but the shaft not
> turning, the field draws full-up excitation current that
> only serves to waste battery energy.
>
> *
> Here's the actual question. I see in Figure 11-20 of AEC (page 8-98), the
> example DC Power master is a DPST switch (same with Z-10/8 and Z-13/8), but
> some of the other diagrams show a DPDT with OFF-BATT-BATT/ALT. Why the
> difference?
>
> I'd rather use a DPST, but is there a good reason to use the DPDT? If I
> have a DPST, will pulling the ALT FLD breaker be the same as leaving the ALT
> side of the split rocker OFF in the few cases I'll be "sitting around
> listening to the radio?" I think the answer is no (removing field circuit
> power instead of voltage regulator power), but then how do I mitigate
> against the scenarios above?
>
> * What ever means you choose to used for removing
> field excitation during battery-only ops is up
> to you. If you opt for crowbar ov protection,
> then the CB offers a convenient means for accomplishing
> the task with a simpler switch. You choose.
>
> ***
>
> ** Bob . . .
>
> *
>
> *
>
>
--
Andrew Zachar
andrew.d.zachar@gmail.com
Message 4
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I have a Lancair ES and am having Transponder issues.
Should the ground plane be grounded or does it matter.
Philip Hildebrand
Message 5
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| Subject: | Re: ectric-List: |
IIRC the Lancair is not metal-skinned....
The ground-plane should be electrically connected to the shield of the coax - which
should also be electrically connected to the ground-side of the electrical
system via the radio.
-----Original Message-----
>From: Phil Hildebrand <Philh@thepritchardgroup.com>
>Sent: Sep 28, 2011 9:49 AM
>To: aeroelectric-list@matronics.com
>Subject: AeroElectric-List:
>
> I have a Lancair ES and am having Transponder issues.
>Should the ground plane be grounded or does it matter.
>
>
>
>
>
>Philip Hildebrand
>
Message 6
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Then why do some radio manufacturers require a ground plane of a minimum
diameter? If the ground plane was connected to the aircraft ground, size
would not matter. (no puns please)
Bruce
WWW.Glasair.org
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Ralph
E. Capen
Sent: Wednesday, September 28, 2011 10:13 AM
Subject: Re: AeroElectric-List:
<recapen@earthlink.net>
IIRC the Lancair is not metal-skinned....
The ground-plane should be electrically connected to the shield of the
coax - which should also be electrically connected to the ground-side of
the electrical system via the radio.
-----Original Message-----
>From: Phil Hildebrand <Philh@thepritchardgroup.com>
>Sent: Sep 28, 2011 9:49 AM
>To: aeroelectric-list@matronics.com
>Subject: AeroElectric-List:
>
> I have a Lancair ES and am having Transponder issues.
>Should the ground plane be grounded or does it matter.
>
>
>
>
>
>Philip Hildebrand
>
Message 7
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| Subject: | Transponder Ground Plane |
The Lancair belly is E glass. What is the proper method of attaching the coax
shield to the ground plane. At the present time my BNC connector to the antenna
is isolated from the ground plane.
Philip Hildebrand, CET
TPG The Pritchard Group
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Ralph E. Capen
Sent: Wednesday, September 28, 2011 9:13 AM
Subject: Re: AeroElectric-List:
IIRC the Lancair is not metal-skinned....
The ground-plane should be electrically connected to the shield of the coax - which
should also be electrically connected to the ground-side of the electrical
system via the radio.
-----Original Message-----
>From: Phil Hildebrand <Philh@thepritchardgroup.com>
>Sent: Sep 28, 2011 9:49 AM
>To: aeroelectric-list@matronics.com
>Subject: AeroElectric-List:
>
> I have a Lancair ES and am having Transponder issues.
>Should the ground plane be grounded or does it matter.
>
>
>
>
>
>Philip Hildebrand
>
Message 8
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The ground plane of minimum diameter provides for the reflection of the RF energy
at the antenna - specifically for non metallic airframes. I think there is
at least one Berkut out there that is set up this way.
In my case, I have my transponder antenna mounted inside my engine cowl pointing
downward with an aluminum circle providing the ground plane. It is isolated
from physical grounding by the mount and is electrically 'bonded' to the ground
system.
Bob could probably explain the theory better - I took it in to practice and it
works well for me.
-----Original Message-----
>From: Bruce <BGray@glasair.org>
>Sent: Sep 28, 2011 10:43 AM
>To: aeroelectric-list@matronics.com
>Subject: RE: AeroElectric-List:
>
>
>Then why do some radio manufacturers require a ground plane of a minimum
>diameter? If the ground plane was connected to the aircraft ground, size
>would not matter. (no puns please)
>
>Bruce
>WWW.Glasair.org
>
>-----Original Message-----
>From: owner-aeroelectric-list-server@matronics.com
>[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Ralph
>E. Capen
>Sent: Wednesday, September 28, 2011 10:13 AM
>To: aeroelectric-list@matronics.com
>Subject: Re: AeroElectric-List:
>
><recapen@earthlink.net>
>
>IIRC the Lancair is not metal-skinned....
>
>The ground-plane should be electrically connected to the shield of the
>coax - which should also be electrically connected to the ground-side of
>the electrical system via the radio.
>
>
>-----Original Message-----
>>From: Phil Hildebrand <Philh@thepritchardgroup.com>
>>Sent: Sep 28, 2011 9:49 AM
>>To: aeroelectric-list@matronics.com
>>Subject: AeroElectric-List:
>>
>> I have a Lancair ES and am having Transponder issues.
>>Should the ground plane be grounded or does it matter.
>>
>>
>>
>>
>>
>>Philip Hildebrand
>>
>
>
Message 9
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| Subject: | Re: Transponder Ground Plane |
The coax shield should be attached to the connector thereby physically connecting
it to the ground plane - that's how mine is....
-----Original Message-----
>From: Phil Hildebrand <Philh@thepritchardgroup.com>
>Sent: Sep 28, 2011 11:14 AM
>To: aeroelectric-list@matronics.com
>Subject: AeroElectric-List: Transponder Ground Plane
>
>
> The Lancair belly is E glass. What is the proper method of attaching the coax
shield to the ground plane. At the present time my BNC connector to the antenna
is isolated from the ground plane.
>
>Philip Hildebrand, CET
>TPG The Pritchard Group
>
>
>-----Original Message-----
>From: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Ralph E. Capen
>Sent: Wednesday, September 28, 2011 9:13 AM
>To: aeroelectric-list@matronics.com
>Subject: Re: AeroElectric-List:
>
>
>IIRC the Lancair is not metal-skinned....
>
>The ground-plane should be electrically connected to the shield of the coax -
which should also be electrically connected to the ground-side of the electrical
system via the radio.
>
>
>-----Original Message-----
>>From: Phil Hildebrand <Philh@thepritchardgroup.com>
>>Sent: Sep 28, 2011 9:49 AM
>>To: aeroelectric-list@matronics.com
>>Subject: AeroElectric-List:
>>
>> I have a Lancair ES and am having Transponder issues.
>>Should the ground plane be grounded or does it matter.
>>
>>
>>
>>
>>
>>Philip Hildebrand
>>
>
>
Message 10
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| Subject: | Re: ectric-List: |
I believe that the minimum size of the ground plane is related to the
wave length of the radio.
John Grosse
Bruce wrote:
> --> AeroElectric-List message posted by: "Bruce"<BGray@glasair.org>
>
> Then why do some radio manufacturers require a ground plane of a minimum
> diameter? If the ground plane was connected to the aircraft ground, size
> would not matter. (no puns please)
>
> Bruce
> WWW.Glasair.org
Message 11
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| Subject: | Re: Transponder Ground Plane |
I would attach a jumper wire to the to the shield (preferably under the
crimp) and then attach that to the ground plane with a screw or bolt.
John Grosse
Phil Hildebrand wrote:
> --> AeroElectric-List message posted by: "Phil Hildebrand"<Philh@thepritchardgroup.com>
>
> The Lancair belly is E glass. What is the proper method of attaching the coax
shield to the ground plane. At the present time my BNC connector to the antenna
is isolated from the ground plane.
>
> Philip Hildebrand, CET
> TPG The Pritchard Group
>
Message 12
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Then why does my WX-500 require a 12 inch ground plane? It only receives
RF.
Bruce
WWW.Glasair.org
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Ralph
E. Capen
Sent: Wednesday, September 28, 2011 11:31 AM
Subject: RE: AeroElectric-List:
<recapen@earthlink.net>
The ground plane of minimum diameter provides for the reflection of the
RF energy at the antenna - specifically for non metallic airframes. I
think there is at least one Berkut out there that is set up this way.
In my case, I have my transponder antenna mounted inside my engine cowl
pointing downward with an aluminum circle providing the ground plane.
It is isolated from physical grounding by the mount and is electrically
'bonded' to the ground system.
Bob could probably explain the theory better - I took it in to practice
and it works well for me.
-----Original Message-----
>From: Bruce <BGray@glasair.org>
>Sent: Sep 28, 2011 10:43 AM
>To: aeroelectric-list@matronics.com
>Subject: RE: AeroElectric-List:
>
>
>Then why do some radio manufacturers require a ground plane of a
minimum
>diameter? If the ground plane was connected to the aircraft ground,
size
>would not matter. (no puns please)
>
>Bruce
>WWW.Glasair.org
>
>-----Original Message-----
>From: owner-aeroelectric-list-server@matronics.com
>[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of
Ralph
>E. Capen
>Sent: Wednesday, September 28, 2011 10:13 AM
>To: aeroelectric-list@matronics.com
>Subject: Re: AeroElectric-List:
>
><recapen@earthlink.net>
>
>IIRC the Lancair is not metal-skinned....
>
>The ground-plane should be electrically connected to the shield of the
>coax - which should also be electrically connected to the ground-side
of
>the electrical system via the radio.
>
>
>-----Original Message-----
>>From: Phil Hildebrand <Philh@thepritchardgroup.com>
>>Sent: Sep 28, 2011 9:49 AM
>>To: aeroelectric-list@matronics.com
>>Subject: AeroElectric-List:
>>
>> I have a Lancair ES and am having Transponder issues.
>>Should the ground plane be grounded or does it matter.
>>
>>
>>
>>
>>
>>Philip Hildebrand
>>
>
>
Message 13
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Try it without the groundplane and you will find out why you need the
thing...
Met vriendelijke groet en
verzonden vanaf de bijna
illegale Samsung Galaxy S2,
Eric Tiethoff.
Op 28 sep. 2011 18:36 schreef "Bruce" <BGray@glasair.org> het volgende:
>
> Then why does my WX-500 require a 12 inch ground plane? It only receives
> RF.
>
> Bruce
> WWW.Glasair.org
>
> -----Original Message-----
> From: owner-aeroelectric-list-server@matronics.com
> [mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Ralph
> E. Capen
> Sent: Wednesday, September 28, 2011 11:31 AM
> To: aeroelectric-list@matronics.com
> Subject: RE: AeroElectric-List:
>
> <recapen@earthlink.net>
>
> The ground plane of minimum diameter provides for the reflection of the
> RF energy at the antenna - specifically for non metallic airframes. I
> think there is at least one Berkut out there that is set up this way.
>
> In my case, I have my transponder antenna mounted inside my engine cowl
> pointing downward with an aluminum circle providing the ground plane.
> It is isolated from physical grounding by the mount and is electrically
> 'bonded' to the ground system.
>
> Bob could probably explain the theory better - I took it in to practice
> and it works well for me.
>
>
> -----Original Message-----
>>From: Bruce <BGray@glasair.org>
>>Sent: Sep 28, 2011 10:43 AM
>>To: aeroelectric-list@matronics.com
>>Subject: RE: AeroElectric-List:
>>
>>
>>Then why do some radio manufacturers require a ground plane of a
> minimum
>>diameter? If the ground plane was connected to the aircraft ground,
> size
>>would not matter. (no puns please)
>>
>>Bruce
>>WWW.Glasair.org
>>
>>-----Original Message-----
>>From: owner-aeroelectric-list-server@matronics.com
>>[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of
> Ralph
>>E. Capen
>>Sent: Wednesday, September 28, 2011 10:13 AM
>>To: aeroelectric-list@matronics.com
>>Subject: Re: AeroElectric-List:
>>
>><recapen@earthlink.net>
>>
>>IIRC the Lancair is not metal-skinned....
>>
>>The ground-plane should be electrically connected to the shield of the
>>coax - which should also be electrically connected to the ground-side
> of
>>the electrical system via the radio.
>>
>>
>>-----Original Message-----
>>>From: Phil Hildebrand <Philh@thepritchardgroup.com>
>>>Sent: Sep 28, 2011 9:49 AM
>>>To: aeroelectric-list@matronics.com
>>>Subject: AeroElectric-List:
>>>
>>> I have a Lancair ES and am having Transponder issues.
>>>Should the ground plane be grounded or does it matter.
>>>
>>>
>>>
>>>
>>>
>>>Philip Hildebrand
>>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>
>
Message 14
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Not the expert on the theory - but I think RF exhibits the same behaviour relative
to the antenna regardless of being transmitted or received.
-----Original Message-----
>From: Bruce <BGray@glasair.org>
>Sent: Sep 28, 2011 12:24 PM
>To: aeroelectric-list@matronics.com
>Subject: RE: AeroElectric-List:
>
>
>Then why does my WX-500 require a 12 inch ground plane? It only receives
>RF.
>
>Bruce
>WWW.Glasair.org
>
>-----Original Message-----
>From: owner-aeroelectric-list-server@matronics.com
>[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Ralph
>E. Capen
>Sent: Wednesday, September 28, 2011 11:31 AM
>To: aeroelectric-list@matronics.com
>Subject: RE: AeroElectric-List:
>
><recapen@earthlink.net>
>
>The ground plane of minimum diameter provides for the reflection of the
>RF energy at the antenna - specifically for non metallic airframes. I
>think there is at least one Berkut out there that is set up this way.
>
>In my case, I have my transponder antenna mounted inside my engine cowl
>pointing downward with an aluminum circle providing the ground plane.
>It is isolated from physical grounding by the mount and is electrically
>'bonded' to the ground system.
>
>Bob could probably explain the theory better - I took it in to practice
>and it works well for me.
>
>
>-----Original Message-----
>>From: Bruce <BGray@glasair.org>
>>Sent: Sep 28, 2011 10:43 AM
>>To: aeroelectric-list@matronics.com
>>Subject: RE: AeroElectric-List:
>>
>>
>>Then why do some radio manufacturers require a ground plane of a
>minimum
>>diameter? If the ground plane was connected to the aircraft ground,
>size
>>would not matter. (no puns please)
>>
>>Bruce
>>WWW.Glasair.org
>>
>>-----Original Message-----
>>From: owner-aeroelectric-list-server@matronics.com
>>[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of
>Ralph
>>E. Capen
>>Sent: Wednesday, September 28, 2011 10:13 AM
>>To: aeroelectric-list@matronics.com
>>Subject: Re: AeroElectric-List:
>>
>><recapen@earthlink.net>
>>
>>IIRC the Lancair is not metal-skinned....
>>
>>The ground-plane should be electrically connected to the shield of the
>>coax - which should also be electrically connected to the ground-side
>of
>>the electrical system via the radio.
>>
>>
>>-----Original Message-----
>>>From: Phil Hildebrand <Philh@thepritchardgroup.com>
>>>Sent: Sep 28, 2011 9:49 AM
>>>To: aeroelectric-list@matronics.com
>>>Subject: AeroElectric-List:
>>>
>>> I have a Lancair ES and am having Transponder issues.
>>>Should the ground plane be grounded or does it matter.
>>>
>>>
>>>
>>>
>>>
>>>Philip Hildebrand
>>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>
>
Message 15
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| Subject: | 300mA AA NiMh charger design needed |
Hi Group
I need a design for an easy to build, low parts count and inexpensive constant
current circuit to charge 3,000mA AA NiMh batteries (~300mA rate C/10 for 14 to
16 hours) from a 12 volt lead acid battery that could have the input voltage
ranging anywhere from ~ 12.2 to 14.5volts.
I would prefer to have as many cells in series as possible when charging.
I have the charge stick figured out to hold cells in series by using 1/2" PVC water
pipe that's a pretty good fit for AA cells.
Thanking you in advance.
Ron Parigoris
BTW I just ordered 50 AA NiMh supposedly 3,000mA batteries from E-bay including
shipping for $25.85 (~$.52 each) Buy it now. I will report on self discharge
rate, ability to dump amps and capacity once I get them.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=353455#353455
Message 16
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| Subject: | Re: A refresher question about switching for |
the battery and "al
At 05:49 AM 9/28/2011, you wrote:
><Tom@CostanzaAndAssociates.com>
>
>I would have thought that starting the engine on with the alternator
>field powered would load the engine, not the alternator.
Don't think anyone said it loaded the alternator.
It's the battery that has to supply 3 or so amps
alternator field excitation when the alternator
is not spinning. Hence it is the battery that
is 'loaded'.
> And with a marginal battery, in cold weather, it might make a
> difference as to whether the engine started or not.
The mechanical 'load' is not zero but it's so tiny
a percentage of what's necessary to crank
the engine that adding it to the mix is
insignificant.
Bob . . .
Message 17
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| Subject: | Re: A refresher question about switching for the |
battery and "alternator."
>Knowing that I won't damage anything while cranking with the
>excitation current there, does a 3-position switch (so I can crank
>without excitation current) help with cranking ability?
Yes . . . but by so small a value as to make
it unobservable without precision measurements.
> (I guess the same question goes for various other electrical
> equipment/avionics; I know cranking with avionics ON won't hurt the
> avionics, but will turning electrical equipment off during cranking
> provide better cranking performance? I think we're talking 200 to
> 300 amps versus just a couple amps...maybe I have more issues if
> those few extra amps are making a big difference.)
A few percent reduction in battery load for
cranking will have no significant impact on
how well the engine starts.
Bob . . .
Message 18
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At 08:49 AM 9/28/2011, you wrote:
> I have a Lancair ES and am having Transponder
> issues. Should the ground plane be grounded or does it matter.
>
The ground plane is a ground for the antenna.
No other grounds are needed.
Bob . . .
Message 19
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| Subject: | Re: ectric-List: |
At 09:13 AM 9/28/2011, you wrote:
><recapen@earthlink.net>
>
>IIRC the Lancair is not metal-skinned....
>
>The ground-plane should be electrically connected to the shield of
>the coax - which should also be electrically connected to the
>ground-side of the electrical system via the radio.
I think he was asking if the ground plane needed
some extra conductor from the metal over to
the electrical system ground.
There is no value in adding such wires from
an RF perspective. I've seen such bonding
conductors added for lightning strike issues
on composite aircraft.
Bob . . .
Message 20
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At 09:43 AM 9/28/2011, you wrote:
>
>Then why do some radio manufacturers require a ground plane of a minimum
>diameter? If the ground plane was connected to the aircraft ground, size
>would not matter. (no puns please)
The ideal ground plane is an infinite number
of radial conductors having the same length
as the antenna itself. In other words, a 22"
comm antenna would ideally sit on a 44" diameter
disk.
The 2.6" transponder antenna sits on a 5.2" disk.
Since the ideal, 'tuned' disk is impractical
for most aircraft installations, the next best
thing is to have 4-8, 22" radials fan out from the
base of the comm antenna and conform to the inside
surface of the aircraft.
Aircraft power ground and antenna RF ground are
completely separate, unrelated systems. See chapter
on antennas and feedlines in the 'Connection.
Bob . . .
Message 21
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| Subject: | Re: Transponder Ground Plane |
At 10:14 AM 9/28/2011, you wrote:
><Philh@thepritchardgroup.com>
>
> The Lancair belly is E glass. What is the proper method of
> attaching the coax shield to the ground plane. At the present time
> my BNC connector to the antenna is isolated from the ground plane.
What kind of antenna? If it's like
this
http://aeroelectric.com/Pictures/Antenna/Transponder_1.jpg
or a shark fin style antenna, then the act of mounting
the antenna to the ground plane takes care of the
connection between BNC connector shell and the
ground plane.
Bob . . .
Message 22
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| Subject: | Re: 300mA AA NiMh charger design needed |
At 03:10 PM 9/28/2011, you wrote:
><rparigor@suffolk.lib.ny.us>
>
>Hi Group
>
>I need a design for an easy to build, low parts count and
>inexpensive constant current circuit to charge 3,000mA AA NiMh
>batteries (~300mA rate C/10 for 14 to 16 hours) from a 12 volt lead
>acid battery that could have the input voltage ranging anywhere from
>~ 12.2 to 14.5volts.
>
>I would prefer to have as many cells in series as possible when charging.
The simplest is an LM317 wired as shown here
http://diyparadise.com/yhlmccs.html
The resistor would be 1.25/.3 or 39 ohms.
The CC Gen will need at least 3 volts
of 'headroom' so 12.5 - 3.0 leaves
9.5 volts worth of cells. This means
you can charge 6 cells in series.
This charge rate will heat the cells.
Plastic pipe may not be the best holder
for allowing the string of cells to
reject heat.
If you like, I could take a few of those
cells and discharge them on the system I
used to produce this article:
http://aeroelectric.com/articles/AA_Bat_Test.pdf
Bob . . .
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