Today's Message Index:
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1. 03:18 AM - Re: GTX327 power switching (Kevin Horton)
2. 03:58 AM - Re: GTX327 power switching (Dave)
3. 05:32 AM - Re: GTX327 power switching (N395V)
4. 05:48 AM - Re: BNC angle adapter doesn't fit (Robert L. Nuckolls, III)
5. 06:16 AM - Re: battery cable routing (Robert L. Nuckolls, III)
6. 06:51 AM - Re: Is this solder okay?Annular slot transponder antennae? (Richard Hughes)
7. 07:17 AM - Re: no battery contactor? (j. davis)
8. 07:21 AM - Re: Is this solder okay?Annular slot transponder antennae? (Robert L. Nuckolls, III)
9. 09:07 AM - Re: GTX327 power switching (Erich_Weaver@URSCorp.com)
10. 10:12 AM - Making 28v from 2 14v sources (to enable an Air conditioning install) (Deems Davis)
11. 10:57 AM - Re: Making 28v from 2 14v sources (to enable an Air conditioning install) (Robert L. Nuckolls, III)
12. 12:11 PM - Re: GTX327 power switching (D Fritz)
13. 03:57 PM - Re: GTX327 power switching (William Gill)
14. 04:41 PM - Current limiter and/or Circuit breaker for alternator (Grant Neilson)
15. 08:47 PM - Re: Current limiter and/or Circuit breaker for alternator (Robert L. Nuckolls, III)
Message 1
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Subject: | Re: GTX327 power switching |
--> AeroElectric-List message posted by: Kevin Horton <khorton01@rogers.com>
On 1 Nov 2006, at 12:32, Erich_Weaver@URSCorp.com wrote:
> --> AeroElectric-List message posted by: Erich_Weaver@URSCorp.com
>
> Does anyone know whether there is something in the GTX327
> instrument set up
> that will allow me to change the default setting to power off
> instead of
> power on?
My GTX-327 does not automatically turn on. I must manually select it
ON. It is several years old, so perhaps they have changed the
firmware. It is possible that they added a configuration item for
this new feature, but there is no mention of it in my old
installation manual. Is there any mention of this feature in the
Configuration Pages section of your installation manual?
Kevin Horton RV-8 (finishing kit)
Ottawa, Canada
http://www.kilohotel.com/rv8
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Message 2
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Subject: | Re: GTX327 power switching |
--> AeroElectric-List message posted by: Dave <dave@abrahamson.net>
You don't mention whether you consulted the online installation
manual, but if not it's at
http://www.garmin.com/manuals/GTX327Transponder_InstallationManual.pdf.
I find no mention of power-up configuration options, and the pin
diagram for connector 3271 lists and "avionics master on", implying
there is none.
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Message 3
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Subject: | Re: GTX327 power switching |
--> AeroElectric-List message posted by: "N395V" <n395v@hughes.net>
Pin 1 is "avionics power on"
Pin 15 is "power input (11-33V)"
I believe if you wish it to remain off you need to disconnect pin one and run power
to pin 15
--------
Milt
N395V
F1 Rocket
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=71744#71744
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Message 4
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Subject: | Re: BNC angle adapter doesn't fit |
--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <nuckollsr@cox.net>
At 06:00 PM 11/1/2006 -0500, you wrote:
>--> AeroElectric-List message posted by: Ken <klehman@albedo.net>
>
>Thought I'd mention that the BNC angle adapter that I had in stock would
>not fit my TED transponder antenna. It's likely a low cost import adapter.
>In fact though none of the angle adapters in two local stores would push
>on far enough even though all the straight connectors that I tried fit
>fine. A minor mystery as I have not been able to figure out why they won't
>push on far enough despite being willing to do some surgery.
>
>Wish I'd known sooner as I just received an order from Steinair today and
>would have ordered one of theirs if I'd known mine wouldn't fit ;(
Radio Shack stocks an acceptable rt-angle adapter for
BNC connectors. I featured this adapter in the comic
book at:
http://www.aeroelectric.com/articles/BNC_Rt_Angle/BNC_Rt_Angle.html
Bob . . .
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Message 5
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Subject: | Re: battery cable routing |
--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <nuckollsr@cox.net>
>Comments/Questions: I have a Glastar which is both a composite fuselage
>design with a steel cage. The Batteries are located in the rear and #2
>cables run forward to firewall. You mention that we need to run cables
>together. I'd like to run them together but split them so the (-) cable
>goes to left side of firewall and the (+) cable goes to the B&C ground
>block on the right. Im going with all electic plane per you design. Is
>this a problem or should I run them to the same side of the
>firewall? Thank You, Scott
Run them together as far as practical. Then splitting at
the firewall is fine.
Bob . . .
-----------------------------------------
( Experience and common sense cannot be )
( replaced with policy and procedures. )
( R. L. Nuckolls III )
-----------------------------------------
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Message 6
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Subject: | Re: Is this solder okay?Annular slot transponder antennae? |
--> AeroElectric-List message posted by: Richard Hughes <richardhughes260@yahoo.com>
Does anyone have any experience with an annular slot
antennae?
Please see the links:
-Rich
http://lea.hamradio.si/~s53mv/avionics/tranant.html
http://richardhughes260.googlepages.com/annularslottranant.GIF
(http://smallbusiness.yahoo.com)
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Message 7
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Subject: | Re: no battery contactor? |
--> AeroElectric-List message posted by: "j. davis" <jd@lawsonimaging.ca>
Thanks, Bob. Clear, concise and timely, as usual ;')
do not archive
Robert L. Nuckolls, III wrote:
> --> AeroElectric-List message posted by: "Robert L. Nuckolls, III"
> <nuckollsr@cox.net>
>
> At 08:59 AM 11/1/2006 -0500, you wrote:
>
>> --> AeroElectric-List message posted by: "j. davis" <jd@lawsonimaging.ca>
>>
>> Greetings...
>>
>> I'm just wondering what the justification for eliminating a battery
>> contactor as per Z17 or Z-20?
>
>
> The engine drive power sources for a number of small
> engines have limited output. The classic battery contactor
> implementation consumes 0.7 to 1.0 amps for the
> duration of flight. In most cases, there's energy-to-
> burn while the main alternator is functioning but
> for Rotax and Jabiru engines, this resource is small
> (8-18 amps) and a builder may elect to avoid power
> losses represented by the installation of a battery
> contactor.
>
> Indeed ANY airplane can use a manual switch in lieu
> of a contactor . . . but recall that one of the design
> goals for a contactor is that when the master switch
> is OFF, the amount of hot wiring between battery and
> battery switch is minimized.
>
>
>> Also, if the S700-2-10 split master type switch can be replaced by a
>> 2-3, per appendix Z, how should it be wired, exactly?
>
> A 2-3 is not progressive transfer . . . so the battery
> and alternator come on and off together. This presents
> a problem for conducting battery-only ground ops
> where an alternator might come alive even with the engine
> not running and load the battery unnecessarily during
> ground testing.
>
> If you use a 2-3, the pulling the alternator field
> breaker during ground ops takes the place of the
> progressive transfer feature of the 2-10 where
> the system can be alive on battery only.
>
> Looking at the back of the switch, the 2-3 is
> wired just like a 2-10.
>
> Bob . . .
>
>
>
>
>
--
Regards, J.
flying: Zenith STOL CH701/912 C-IGGY, 350 hrs.
building: Sonex #325, Jabiru 3300/6, 85% completed
+-------------------------------------------------------+
| J. Davis, M.Sc. | (computer science) |
| *NIX consulting, SysAdmin | jd at lawsonimaging.ca |
| c/o Brandywine Aviation | voice: 519.289.1527 |
| 5507 Irish Dr., Appin, ON | http://www.cleco.ca |
| N42 47.33 W081 36.50 31/13 | 2000+ x 60', elev: 740' |
+-------------------------------------------------------+
To most people the sky is the limit.
To those who love aviation, the sky is home.
Take charge of your attitude. Don't let someone else choose
it for you.
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Message 8
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Subject: | Re: Is this solder okay?Annular slot transponder |
antennae?
--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <nuckollsr@cox.net>
At 06:50 AM 11/2/2006 -0800, you wrote:
>--> AeroElectric-List message posted by: Richard Hughes
><richardhughes260@yahoo.com>
>
>Does anyone have any experience with an annular slot
>antennae?
>
>Please see the links:
>
>-Rich
>
>http://lea.hamradio.si/~s53mv/avionics/tranant.html
>
>http://richardhughes260.googlepages.com/annularslottranant.GIF
We used a number of antennas like this on our supersonic
targets (things that stick out in the breeze at Mach 4
tend to burn off). I can't speak to comparative performance
'cause I wasn't working those issues . . . and in any case,
we had no choice. At the same time, I didn't hear of any
antenna performance issues.
I believe they have a radiation pattern similar to this:
http://www.aeroelectric.com/Pictures/Misc/Circular_Aperture_Ant_Radiation_Pattern.pdf
. . . which makes them less than ideal for talking/listening
to stations on the horizon. We often had an array of 3 or 4 antennas
around the body of the aircraft fed by couplers so as to improve
on the "omni directional" radiation pattern.
I think I'd look long and hard for some lab test data on
suitability of this antenna to the task before crafting
one for the airplane. Know also that built-to-print often
does not yield the idealized antenna . . . the finished
device is best tested and optimized with the proper test
equipment. Then too . . . you can always try it and see
how it performs for your flight modes. Anecdotal data is
better than no data.
Bob . . .
---------------------------------------------------------
< What is so wonderful about scientific truth...is that >
< the authority which determines whether there can be >
< debate or not does not reside in some fraternity of >
< scientists; nor is it divine. The authority rests >
< with experiment. >
< --Lawrence M. Krauss >
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Message 9
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Subject: | re: GTX327 power switching |
--> AeroElectric-List message posted by: Erich_Weaver@URSCorp.com
Milt wrote:
Pin 1 is "avionics power on"
Pin 15 is "power input (11-33V)"
I believe if you wish it to remain off you need to disconnect pin one and
run power
to pin 15
Milt, Im sure you are correct, as I received the identical answer from
someone on the Vansairforce site. Thanks so much.
Erich Weaver
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Message 10
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Subject: | Making 28v from 2 14v sources (to enable an Air conditioning |
install)
--> AeroElectric-List message posted by: Deems Davis <deemsdavis@cox.net>
I have built a 14v dual battery, dual alternator system. (Z14). I live
in AZ and am interested in installing an air conditioning system. In
researching a/c systems, I'm uncomfortable with the added mechanical
complexity of running hoses and the engine driven compressor into the
engine compartment. I concede that this may be a more efficient means of
generating the power for the a/c, but it adds complexity/weight and a
load in an area that I would prefer not to. I have identified a couple
of sources that provide 28v AC systems. I have too much invested into my
build re 14 v components to warrant redoing the electrical system (to
28v). So in noodling it seems to me that _conceptually_ one should be
able to take a feed from each of the 14v systems and couple them
together to produce the 28v required for the ac unit. So, for those of
you further along the electro learning curve than I, is this
_practically_ possible? If so what components would be required to make
the connection to produce 28V?
Thanks in advance for any consideration and input.
PS Thanks for all of the input on the IPOD connect
Deems Davis # 406
Finishing - ( A Misnomer ! )
http://deemsrv10.com/
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Message 11
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Subject: | Re: Making 28v from 2 14v sources (to enable an Air |
conditioning install)
--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <nuckollsr@cox.net>
At 11:10 AM 11/2/2006 -0700, you wrote:
>--> AeroElectric-List message posted by: Deems Davis <deemsdavis@cox.net>
>
>I have built a 14v dual battery, dual alternator system. (Z14). I live in
>AZ and am interested in installing an air conditioning system. In
>researching a/c systems, I'm uncomfortable with the added mechanical
>complexity of running hoses and the engine driven compressor into the
>engine compartment. I concede that this may be a more efficient means of
>generating the power for the a/c, but it adds complexity/weight and a load
>in an area that I would prefer not to. I have identified a couple of
>sources that provide 28v AC systems. I have too much invested into my
>build re 14 v components to warrant redoing the electrical system (to
>28v). So in noodling it seems to me that _conceptually_ one should be able
>to take a feed from each of the 14v systems and couple them together to
>produce the 28v required for the ac unit. So, for those of you further
>along the electro learning curve than I, is this _practically_ possible?
>If so what components would be required to make the connection to produce 28V?
>
>Thanks in advance for any consideration and input.
>
>PS Thanks for all of the input on the IPOD connect
Not easy. You'd need to craft an electrically isolated
14 volt system to "stack" on top of the grounded system.
This would require a special alternator for the #2 machine.
Further, the "bottom" alternator would need to be scaled
to carry normal ship's loads + the a/c.
The "top" system would not be useable for backing up
the bottom system without some complex switching.
The pitfalls of all this are considerable not to mention
the time and $ to implement it.
I'd jump on a belt driven compressor in a heartbeat.
Bob . . .
---------------------------------------------------------
< What is so wonderful about scientific truth...is that >
< the authority which determines whether there can be >
< debate or not does not reside in some fraternity of >
< scientists; nor is it divine. The authority rests >
< with experiment. >
< --Lawrence M. Krauss >
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Message 12
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Subject: | Re: GTX327 power switching |
Erich,
I have the same transponder and it does the same thing yours does. I've looked into it a little bit, but am deployed so I can't look at the wiring on my unit. There appears to be a pin on the connector that, if powered, is set up to have the unit power on automatically in the same state as last used when the avionics master is turned on (or power applied to the endurance bus in your case). My guess is that this pin is jumpered to the bus power in my harness, I intend to check when I return. Take a look at figure B4 in the installation manual. (Here's a link to Andy Plunket's Glasair website with an install manual: http://glasairproject.com/docs/Garmin327im.pdf)
Dan Fritz
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Message 13
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Subject: | GTX327 power switching |
--> AeroElectric-List message posted by: "William Gill" <wgill10@comcast.net>
Leave pin 1 open and connect pin 15 to aircraft power (avionics bus)
Bill
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Dave
Sent: Thursday, November 02, 2006 5:57 AM
Subject: Re: AeroElectric-List: GTX327 power switching
--> AeroElectric-List message posted by: Dave <dave@abrahamson.net>
You don't mention whether you consulted the online installation
manual, but if not it's at
http://www.garmin.com/manuals/GTX327Transponder_InstallationManual.pdf.
I find no mention of power-up configuration options, and the pin
diagram for connector 3271 lists and "avionics master on", implying
there is none.
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Message 14
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Subject: | Current limiter and/or Circuit breaker for alternator |
If I install a current limiter, say an ANL80, should I still also install a
conventional 60 or 70 amp circuit breaker in the alternator output? Or is
that an unnecessary redundancy? If it's not necessary, is there any down
side to having both, other than the additional minimal weight and cost?
Thanks for any input.
Message 15
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Subject: | Re: Current limiter and/or Circuit breaker for alternator |
--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <nuckollsr@cox.net>
At 04:40 PM 11/2/2006 -0800, you wrote:
>If I install a current limiter, say an ANL80, should I still also install
>a conventional 60 or 70 amp circuit breaker in the alternator output? Or
>is that an unnecessary redundancy? If it's not necessary, is there any
>down side to having both, other than the additional minimal weight and cost?
>Thanks for any input.
The whole idea behind the ANL is to get the alternator
b-lead out of the cockpit . . . and if it's out of the
cockpit, then ANL or equivalent devices for circuit
protection are called for. Breakers under the cowl
don't make much sense.
Bob . . .
---------------------------------------------------------
< What is so wonderful about scientific truth...is that >
< the authority which determines whether there can be >
< debate or not does not reside in some fraternity of >
< scientists; nor is it divine. The authority rests >
< with experiment. >
< --Lawrence M. Krauss >
---------------------------------------------------------
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