Today's Message Index:
----------------------
1. 03:48 AM - LED post lights for instrument lighting? (Ian Scott)
2. 04:01 AM - Re: RF power (Cy Galley)
3. 05:42 AM - Make your own AOA indicator? Using $50 guage? (Ian Scott)
4. 05:58 AM - sawmotors (Gary Casey)
5. 10:04 AM - Hall Effect Ammeters (Geoff Evans)
6. 10:09 AM - Ampers (Terry Lamp)
7. 10:37 AM - Re: Multiple GPS feeds (Scot Stambaugh)
8. 11:38 AM - Re: Hall Effect Ammeters (Robert L. Nuckolls, III)
9. 11:43 AM - Re: LED post lights for instrument lighting? (Robert L. Nuckolls, III)
10. 12:47 PM - Re: sawmotors (lonnwood)
11. 03:56 PM - Re: LED post lights for instrument lighting? (RSwanson)
12. 04:41 PM - Re: LED post lights for instrument lighting? (Tom Brusehaver)
13. 05:06 PM - Re: Multiple GPS feeds (Scot Stambaugh)
14. 05:29 PM - Re: Hall Effect Ammeters (Geoff Evans)
15. 05:32 PM - PM-OV and E-bus switch (Geoff Evans)
16. 05:42 PM - Re: LED post lights for instrument lighting? (Cy Galley)
17. 05:53 PM - Re: Multiple GPS feeds (Alex Peterson)
18. 06:04 PM - Re: Make your own AOA indicator? Using $50 guage? (Jerzy Krasinski)
19. 06:08 PM - Re: Multiple GPS feeds (Steve J Hurlbut)
20. 06:13 PM - Re: PM-OV and E-bus switch ()
21. 06:35 PM - Fw: RV-List: Electrical System Gremlin (Tom & Cathy Ervin)
22. 07:43 PM - Multiple GPS feeds (Ronald Cox)
23. 08:14 PM - Re: Fw: RV-List: Electrical System Gremlin (Phil Birkelbach)
24. 09:32 PM - Re: Multiple GPS feeds (Todd Houg)
Message 1
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| Subject: | LED post lights for instrument lighting? |
--> AeroElectric-List message posted by: "Ian Scott" <jabiru22@yahoo.com.au>
HI BOB and all,
Have you got any ideal, examples for LED post lights for cockpit
instrument lighting?
Thanks
Ian
Message 2
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--> AeroElectric-List message posted by: "Cy Galley" <cgalley@qcbc.org>
Make sure the antenna cable in the back of the transponder is seated. Had
that happen with my Bellanca on a King 76A
Cy Galley - Bellanca Champion Club
Newsletter Editor & EAA TIC
www.bellanca-championclub.com
We support Aeroncas
----- Original Message -----
From: "Bill Hibbing" <n744bh@bellsouth.net>
Subject: Re: AeroElectric-List: RF power
> --> AeroElectric-List message posted by: "Bill Hibbing"
<n744bh@bellsouth.net>
>
>
> > If the tech was using a ramp tester to read your encoder, then
> > he would have been able to detect ANY output power. Was the
> > reply light reacting to the ramp tester?
> >
> > Bob . . .
> >
> > Thanks for the reply Bob. The tech was using a ramp tester to read the
> blind encoder output and we couldn't get any reading of power, or
altitude,
> at all. As I recall, the reply light was not reacting to the ramp tester.
> He had just finished my other plane so we know the ramp test unit was
> working ok. We had 12.5 volts feeding the system so that should not have
> caused any problem. What I want to do here is exhaust all the trouble
> shooting options available to me before I take the xpnder in to have it
> bench checked. It is a "yellow tagged" unit...KT 76A. The encoder is a
> Ameri-King AK-350 which is new. I bought the encoder from one of the
> "Coast" avionics outfits and they did the plug wiring for me. Do you have
> any more ideas for me.
> Bill
> Glasair SIIS-FT
>
>
Message 3
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| Subject: | Make your own AOA indicator? Using $50 guage? |
--> AeroElectric-List message posted by: "Ian Scott" <jabiru22@yahoo.com.au>
I know it is not electric, however looks really good? (plus you could
put a LED light in it and therefore it is relevant to list.
http://www.snyder.on.ca/pages/lri.htm
Ian
Message 4
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--> AeroElectric-List message posted by: "Gary Casey" <glcasey@adelphia.net>
Sorry about extending the off-topic discussion, but I will certainly weigh
in with Bob on the idea of using current, not rpm as the measurement of
choice. I would bet that the motor is a 3-phase induction type and as such
the rpm will only drop about 3% from no-load to full load, a very small
range to monitor on a tach. Once the rpm drops below this the speed will
rapidly drop and the motor may likely stall. Most "real" installations I
have seen of this type have current monitors and this would be very easy to
monitor so the feed speed could be adjusted. The current will rise from
maybe 30% to 100% when going from no load to full load.
Gary Casey
Message 5
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| Subject: | Hall Effect Ammeters |
--> AeroElectric-List message posted by: Geoff Evans <hellothaimassage@yahoo.com>
A few months back in the archives, Bob wrote:
-----
You can also use the hall-sensor to measure
the current in more than one wire wherein the sensor
sees the algebraic sum of all the currents. Not much
application for this in airplanes but there is ONE
two-wire opportunity. You can run the b-lead for both
the main and aux alternators through the sensor and it
will read either alternator or the sum of both should they
both happen to be on and delivering power.
----
I'm not quite sure how one could do this, as the b-leads from the different
alternators seem to go to different places. In drawing Z-13, for example, the
main b-lead goes the the starter and then the battery contactor, but the
alternate b-lead goes to the *other* side of the battery contactor.
Am I missing something, or is there a way to run two b-leads through a single
hall effect sensor when the b-leads need to go to different places?
Thanks.
-Geoff
http://tax.yahoo.com
Message 6
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04/04/2003 01:11:08 PM
--> AeroElectric-List message posted by: "Terry Lamp" <tlamp@genesishcs.org>
I was flying my new LongEZ last evening. (28 hours now)
I noticed that my VM1000 amp gauge was fluxuating from 11 amps then 8,6,4, then
back to 11 and so on. Cycling over about 1 min.
The induction pick up is inline of the charging wire off of the alt. to the battery,
2 ga. wire since it also doubles as the power to the starter,
both of which are of course out back.
Does this sound normal.
I run one Elec Ign. the usual VFR stuff and the strodes were on.
Nip alt, B&C voltage reg (LR3), ship wiring as in Z-9.
Thanks,
Terry Lamp Long EZ N977JT Ohio
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Message 7
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| Subject: | Re: Multiple GPS feeds |
--> AeroElectric-List message posted by: Scot Stambaugh <sstambaugh@qualcomm.com>
Steve,
The GPS 35 is a complete 12 channel GPS receiver, not just an
antenna. once power is applied, it finds satellites and gathers a
longitude and latitude position coordinates as well as developing a error
metric and a number of other variables that it can offer to whatever devise
it is connected to, such as a Trutrak A/P or a Chelton Flight Systems EFIS
or Control Vision's Anywhere moving map package. The interface to the GPS
35 is a RS-232 two way serial connection that reports the various
information to the above instruments. RS-232 is intended to be a
point-to-point protocol, which means one unit on each end of the
cable. Since the above mentioned units assume that there is only one
device on the other end of the cable it only sends the information that is
requested of it. So, consider this situation. If you have one GPS 35 and
you connect it to the Trutrak and also the GTX 327. The GTX 327 may only
request Lat/Lon information and never ask for any of the other data that
the unit makes available, but the Trutrak wants to also request position
error data for example. What could happen is the Trutrack would send a
command to the GPS requesting a position error message and the GPS promptly
replies. The GTX 327 is connected to the same wire and gets the position
error message same as the Trutrak but one of two things will happen. The
design engineer for the GTX 327 assumed that this would always be a
point-to-point connection and that all messages are for him only and would
attempt to decipher the "position error" message as Lat/Lon. It would
either get confused and declare an error, or worse, it would somehow
convince itself that the data string is a Lat/Lon and treat it as
such. Now everything is hosed.
Now, onto your original question, GPS antenna signals should be able to be
split and shared between GPS receivers but the signal is not real
strong. It dissipates over long cable runs and should be carefully managed
when adding additional loads to it such as making it drive two GPS's. You
can purchase GPS amplifiers for long cable runs or just to boost the signal
but you need to know what your doing because if you don't need to boost the
signal that much and you give the GPS receiver too much signal that will
cause signal distortion. A reduction in signal power to the GPS receiver
will usually result in a difficultly for the receiver to detect and acquire
as many satellites. This increases position error and can cause signal
loss conditions more often.
Sorry for the long dissertation. I am in a similar situation, with a GPS
35 driving my CFS EFIS-2000 and needing (but not wanting) a second GPS 35
to drive my Anywhere map PDA system as a backup.
good luck,
scot
At 10:02 PM 4/3/2003 -0500, you wrote:
>--> AeroElectric-List message posted by: "Steve J Hurlbut"
><sjhdcl@kingston.net>
>
>Can a GPS antenna feed more than 1 GPS device?
>
>Trutrak Flight Systems says no, Garmin says yes.
>
>Which is it and anybody have experience doing this?
>
>Specically I want to feed GPS signal to my Digitrak autopilot and GTX 327
>transponder.
>I have a GPS 35 receiver as recommended by Trutrak Flight Systems.
>
>Steve
>Rv7A
>Wiring
>
>
Message 8
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| Subject: | Re: Hall Effect Ammeters |
--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <bob.nuckolls@cox.net>
At 10:04 AM 4/4/2003 -0800, you wrote:
>--> AeroElectric-List message posted by: Geoff Evans
><hellothaimassage@yahoo.com>
>
>A few months back in the archives, Bob wrote:
>
>-----
> You can also use the hall-sensor to measure
> the current in more than one wire wherein the sensor
> sees the algebraic sum of all the currents. Not much
> application for this in airplanes but there is ONE
> two-wire opportunity. You can run the b-lead for both
> the main and aux alternators through the sensor and it
> will read either alternator or the sum of both should they
> both happen to be on and delivering power.
>----
>
>I'm not quite sure how one could do this, as the b-leads from the different
>alternators seem to go to different places. In drawing Z-13, for example, the
>main b-lead goes the the starter and then the battery contactor, but the
>alternate b-lead goes to the *other* side of the battery contactor.
>
>Am I missing something, or is there a way to run two b-leads through a single
>hall effect sensor when the b-leads need to go to different places?
The hall sensor has no way of knowing where the wires
it watches goes and doesn't care. It measures the total
magnetic field around the wire(s) and converts this to
a voltage proportional to magnetic field which is in
turn proportional to the sum of currents in the wires.
Now, suppose you had a pair of wires, each carrying
5A in the same direction through the sensor. The sensor
has no way to know if it's one wire with 10A or 5 wires
with 2A. Suppose you had two wires; one carrying
10A in one direction and a second wire with 3A
in the OPPOSITE direction, the hall sensor would "see"
a field proportional to 7A and would respond appropriately.
You can run both alternator output leads through the
same sensor. If both are running, then the sensor would
report the sum total of output from both irrespective
of their sizes . . . in most cases, the alternators
do not run at the same time. In the "All-Electric-Airplane-
on-a-Budget" drawing, running both alternator feed wires
through the same sensor would allow it to read EITHER
or BOTH alternators, depending on which ones were turned
on. Given that this system is designed to operate on
alternator at a time, whatever the Amps display says
at the moment is the output load for the alternator
currently ON.
Bob . . .
>Thanks.
>-Geoff
>
>http://tax.yahoo.com
>
>
Bob . . .
|-------------------------------------------------------|
| The man who does not read good books has no advantage |
| over the man who cannot read them. |
| - Mark Twain |
|-------------------------------------------------------|
Message 9
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| Subject: | Re: LED post lights for instrument lighting? |
--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <bob.nuckolls@cox.net>
At 09:47 PM 4/4/2003 +1000, you wrote:
>--> AeroElectric-List message posted by: "Ian Scott" <jabiru22@yahoo.com.au>
>
>
>HI BOB and all,
>
>Have you got any ideal, examples for LED post lights for cockpit
>instrument lighting?
This is possible but for the moment, difficult
to do practically. Output beam-width LEDs is narrow
compared to the more spherical output from lamps.
Getting an LED to illuminate a post light fixture
in the same manner as the incandescent lamp would
take some doing. The light fixtures I've purchased
from RS in the past for my LV Warn indicators appears
to have been discontinued. I'm looking for a new fixture
that gives me the nice scattering pattern in front
of the LED as the old one did . . . it's not a plug-n-
play situation across the spectrum of fixtures.
There are LEDs with sufficient light output to do
what you propose but the physics on which they
operate makes them a less than idea substitute.
Bob . . .
Message 10
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--> AeroElectric-List message posted by: "lonnwood" <lonnwood@msn.com>
Thanks Bob and everybody else that responded.
Such a wealth of knowledge and experience.
I think I will look into rigging up an ammeter.
Lonnie
Message 11
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| Subject: | Re: LED post lights for instrument lighting? |
--> AeroElectric-List message posted by: RSwanson <rswan19@comcast.net>
I built some that provide adequate light. The LEDs came from Radio Shack
and have a 180 degree light pattern. I machined reflectors from 1/2
aluminum rod tapped 8-32 and mounted with drilled brass screws with their
heads removed.
I found out they were discontinuing them and bought all I could find.
R
----- Original Message -----
From: "Robert L. Nuckolls, III" <bob.nuckolls@cox.net>
Subject: Re: AeroElectric-List: LED post lights for instrument lighting?
> --> AeroElectric-List message posted by: "Robert L. Nuckolls, III"
<bob.nuckolls@cox.net>
>
> At 09:47 PM 4/4/2003 +1000, you wrote:
> >--> AeroElectric-List message posted by: "Ian Scott"
<jabiru22@yahoo.com.au>
> >
> >
> >HI BOB and all,
> >
> >Have you got any ideal, examples for LED post lights for cockpit
> >instrument lighting?
>
> This is possible but for the moment, difficult
> to do practically. Output beam-width LEDs is narrow
> compared to the more spherical output from lamps.
> Getting an LED to illuminate a post light fixture
> in the same manner as the incandescent lamp would
> take some doing. The light fixtures I've purchased
> from RS in the past for my LV Warn indicators appears
> to have been discontinued. I'm looking for a new fixture
> that gives me the nice scattering pattern in front
> of the LED as the old one did . . . it's not a plug-n-
> play situation across the spectrum of fixtures.
>
> There are LEDs with sufficient light output to do
> what you propose but the physics on which they
> operate makes them a less than idea substitute.
>
> Bob . . .
>
>
Message 12
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| Subject: | Re: LED post lights for instrument lighting? |
--> AeroElectric-List message posted by: Tom Brusehaver <cozytom@mn.rr.com>
I built mine, and I think they do a fine job
(in the basement with all the lights off I am
comfortable sitting in front of the panel,
and things look good).
I am using 3000mcd red LEDs that I got originally
from radio shack, but the last batch I bought
at all electronics.
I used plastruct that you can buy at the hobby
store. I used 3/16" tube about 1-1/2" long,
then a 3/8x1/4 rectangular tube glued on at a
right angle.
+------------------+
| |
| | <-- 3/8
+--+---+-----------+
| | \__\
| |
| |
----- LED
| |
3/16 tube->| |
| |
| |
| |
| |
---------------------------Panel
I wired up the LEDs with 1/4 watt 1K ohm resistor
and stuffed it in the rectangular area. then ran
the wires down the tube. Put some tape over one
end of the rectangular area, and filled the
rectangular tube with 5min epoxy. When the epoxy
hardened, I filed the ends round for aesthetics.
I'll probably paint them black eventually.
Because the cone of the LED light is rather narrow,
I put the LEDs quite far from the panel, and angled
better than 45degrees toward the center of the
instrument. The first few I did at 45, and they will
probably be fine for 2-1/4" instruments, but for
3-1/8" ones I needed a little more angle.
The styrene is quite flexible, so some bumping would
be fine, but if someone were to step on one or tweak
it just right, it would break off.
I think the 15 I have built so far maybe cost $30
plus I have materials to build another 4 or 5.
Robert L. Nuckolls, III wrote:
> --> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <bob.nuckolls@cox.net>
>
> At 09:47 PM 4/4/2003 +1000, you wrote:
>
>>--> AeroElectric-List message posted by: "Ian Scott" <jabiru22@yahoo.com.au>
>>
>>
>>HI BOB and all,
>>
>>Have you got any ideal, examples for LED post lights for cockpit
>>instrument lighting?
>
>
> This is possible but for the moment, difficult
> to do practically. Output beam-width LEDs is narrow
> compared to the more spherical output from lamps.
> Getting an LED to illuminate a post light fixture
> in the same manner as the incandescent lamp would
> take some doing. The light fixtures I've purchased
> from RS in the past for my LV Warn indicators appears
> to have been discontinued. I'm looking for a new fixture
> that gives me the nice scattering pattern in front
> of the LED as the old one did . . . it's not a plug-n-
> play situation across the spectrum of fixtures.
>
> There are LEDs with sufficient light output to do
> what you propose but the physics on which they
> operate makes them a less than idea substitute.
>
Message 13
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| Subject: | Re: Multiple GPS feeds |
--> AeroElectric-List message posted by: Scot Stambaugh <sstambaugh@qualcomm.com>
Steve,
I just went to the Garmin web site and looked at the GTX327. I couldn't
find any features that made any use of an interface between the GNS430 and
GTS327. The GTX330/330D have mode S capability that allows uplink of data
that can then be sent to the 430 for display.
What is the nature of the link you are implementing between the 430 and the
327?
scot
At 10:02 PM 4/3/2003 -0500, you wrote:
>--> AeroElectric-List message posted by: "Steve J Hurlbut"
><sjhdcl@kingston.net>
>
>Can a GPS antenna feed more than 1 GPS device?
>
>Trutrak Flight Systems says no, Garmin says yes.
>
>Which is it and anybody have experience doing this?
>
>Specically I want to feed GPS signal to my Digitrak autopilot and GTX 327
>transponder.
>I have a GPS 35 receiver as recommended by Trutrak Flight Systems.
>
>Steve
>Rv7A
>Wiring
>
>
Message 14
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| Subject: | Re: Hall Effect Ammeters |
--> AeroElectric-List message posted by: Geoff Evans <hellothaimassage@yahoo.com>
Bob wrote:
>>
The hall sensor has no way of knowing where the wires it watches goes and
doesn't care.
<<
I see where my mistake was.. I looking at the picture of the hall effect meter
on page 7-16 of your book, I neglected to notice the hole in the middle of it.
I thought the b-leads actually bolted on to the lugs somehow, where it wouldn't
be possible to split the feeds apart again after you combined them. Now I see
the hole in the box, and all is well.
Thanks.
-Geoff
do not archive
http://tax.yahoo.com
Message 15
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| Subject: | PM-OV and E-bus switch |
--> AeroElectric-List message posted by: Geoff Evans <hellothaimassage@yahoo.com>
Bob. I sent this question to you via email, but perhaps it got lost by the
wayside. I'll repeat the question here.
I have a question about the B&C PM-OV 14 product.
It looks like all the same stuff you recommed for protecting the SD-8
alternator, except the relay has extra lugs on it for the light bulb. The B&C
website says that, if wired according to their diagram, that the light will
illuminate if the alternator switch is left off or if the crowbar trips.
I think I understand how the circuit trips, but I don't understand why you
would want a light that illuminates when the alternator is turned off...
Assuming that I'm going to use the SD-8 as a backup alternator, and following
your advice about not putting two alternators on the same bus at the same time,
why would I want a light that functioned in this manner? The light would be on
for all normal operations.
Perhaps this product is designed to be used with the SD-8 when it is the only
alternator in the airplane, or when it is running on a separate, isolated
bus...
------
On a totally different subject.. What happens in your Z-11 circuit philosophy
if the E-bus alternate feed switch is on at the same time the battery master
switch is on? It looks to me like absolutely nothing, but I just wanted to make
sure.
Thanks.
-Geoff
RV-8 QB Fuselage
http://tax.yahoo.com
Message 16
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| Subject: | Re: LED post lights for instrument lighting? |
--> AeroElectric-List message posted by: "Cy Galley" <cgalley@qcbc.org>
do you have any pictures?
Cy Galley, TC - Chair, Emergency Aircraft Repair, Oshkosh
Editor, EAA Safety Programs
cgalley@qcbc.org or experimenter@eaa.org
Always looking for articles for the Experimenter
----- Original Message -----
From: "Tom Brusehaver" <cozytom@mn.rr.com>
Subject: Re: AeroElectric-List: LED post lights for instrument lighting?
> --> AeroElectric-List message posted by: Tom Brusehaver
<cozytom@mn.rr.com>
>
>
> I built mine, and I think they do a fine job
> (in the basement with all the lights off I am
> comfortable sitting in front of the panel,
> and things look good).
>
> I am using 3000mcd red LEDs that I got originally
> from radio shack, but the last batch I bought
> at all electronics.
>
> I used plastruct that you can buy at the hobby
> store. I used 3/16" tube about 1-1/2" long,
> then a 3/8x1/4 rectangular tube glued on at a
> right angle.
>
>
> +------------------+
> | |
> | | <-- 3/8
> +--+---+-----------+
> | | \__\
> | |
> | |
> ----- LED
> | |
> 3/16 tube->| |
> | |
> | |
> | |
> | |
> ---------------------------Panel
>
> I wired up the LEDs with 1/4 watt 1K ohm resistor
> and stuffed it in the rectangular area. then ran
> the wires down the tube. Put some tape over one
> end of the rectangular area, and filled the
> rectangular tube with 5min epoxy. When the epoxy
> hardened, I filed the ends round for aesthetics.
> I'll probably paint them black eventually.
>
> Because the cone of the LED light is rather narrow,
> I put the LEDs quite far from the panel, and angled
> better than 45degrees toward the center of the
> instrument. The first few I did at 45, and they will
> probably be fine for 2-1/4" instruments, but for
> 3-1/8" ones I needed a little more angle.
>
> The styrene is quite flexible, so some bumping would
> be fine, but if someone were to step on one or tweak
> it just right, it would break off.
>
> I think the 15 I have built so far maybe cost $30
> plus I have materials to build another 4 or 5.
>
>
> Robert L. Nuckolls, III wrote:
> > --> AeroElectric-List message posted by: "Robert L. Nuckolls, III"
<bob.nuckolls@cox.net>
> >
> > At 09:47 PM 4/4/2003 +1000, you wrote:
> >
> >>--> AeroElectric-List message posted by: "Ian Scott"
<jabiru22@yahoo.com.au>
> >>
> >>
> >>HI BOB and all,
> >>
> >>Have you got any ideal, examples for LED post lights for cockpit
> >>instrument lighting?
> >
> >
> > This is possible but for the moment, difficult
> > to do practically. Output beam-width LEDs is narrow
> > compared to the more spherical output from lamps.
> > Getting an LED to illuminate a post light fixture
> > in the same manner as the incandescent lamp would
> > take some doing. The light fixtures I've purchased
> > from RS in the past for my LV Warn indicators appears
> > to have been discontinued. I'm looking for a new fixture
> > that gives me the nice scattering pattern in front
> > of the LED as the old one did . . . it's not a plug-n-
> > play situation across the spectrum of fixtures.
> >
> > There are LEDs with sufficient light output to do
> > what you propose but the physics on which they
> > operate makes them a less than idea substitute.
> >
>
>
Message 17
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| Subject: | Multiple GPS feeds |
--> AeroElectric-List message posted by: "Alex Peterson" <alexpeterson@usjet.net>
> I just went to the Garmin web site and looked at the GTX327.
> I couldn't
> find any features that made any use of an interface between
> the GNS430 and
> GTS327. The GTX330/330D have mode S capability that allows
> uplink of data
> that can then be sent to the 430 for display.
> What is the nature of the link you are implementing between
> the 430 and the
> 327?
Having done this in my plane, I can tell you the links. First, the 430
sends a serial data stream to the 327 which, among other things, tells
the 327 when the ground speed is above 40 knots. This signal can be
used to switch the transponder from standby to altitude and vice versa,
a nice feature. It is a remarkably common thing to hear ATC asking a
pilot who just took off to switch his transponder on. The 327 sends
back a serial data stream to the 430 which includes the altitude
information the transponder is receiving from the altitude encoder. The
430 uses this data to refine/compare the altitude data gathered from the
GPS receiver in some fashion. I can't tell you exactly how the 430 uses
the altitude data, but it does inform me if I turn off the transponder
with a message like "not receiving altitude information". Possibly, it
will inform one of differences greater than some amount between the two
altitude systems, I don't know.
Alex Peterson
Maple Grove, MN
RV6-A N66AP 291 hours
www.rvforum.org
www.usfamily.net/web/alexpeterson
Message 18
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|
| Subject: | Re: Make your own AOA indicator? Using $50 guage? |
--> AeroElectric-List message posted by: Jerzy Krasinski <krasinski@direcway.com>
Replace the pressure gauge with a pressure/voltage transducer, connect
the output to a bargraph driver and display it using a bar of LEDs with
different colors, and it is ALL electric. Doing it this way you do not
have to mess with alignment of the mechanical gauge "...until it
shows..." whatever. Just mount it roughly at 45 degres to the flow and
thats it, since you can make voltage correction electronically. Or
better yet, make two pressure sensing openings at the front of the wing,
say in the wing tip. One of them should be sensing the pressure above
the nose of the airfoil and the other one below, at points where the
flows would be ~orthogonal to each other. Increasing the attack angle
you would make more pressure from the lower opening and less pressure
from the upper. This way you get an invisible probe.
A transducer like that, with a pressure range of 5" of water, 0.25%
precision, would cost $40 from Digikey, (cat # 356-1036-ND), and the
bargraph driver you can find in Radio Shack.
Jerzy
Ian Scott wrote:
>--> AeroElectric-List message posted by: "Ian Scott" <jabiru22@yahoo.com.au>
>
>
>I know it is not electric, however looks really good? (plus you could
>put a LED light in it and therefore it is relevant to list.
>
>
>http://www.snyder.on.ca/pages/lri.htm
>
>Ian
>
>
>
>
Message 19
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|
| Subject: | Re: Multiple GPS feeds |
--> AeroElectric-List message posted by: "Steve J Hurlbut" <sjhdcl@kingston.net>
The GTX327 has the ability to automatically switch from STBY to ALT and
back by detecting ground speed above 40 kts. It also starts a flight timer
when this speed
is reached.
In order to be able to get these features to work the GTX327 needs GPS info.
As far as I have been able to determine you can't wire the GTX327 directly
to
a GPS antenna. Instead it must get the required info from another unit such
as the
430.
If all you have is an antenna and the GTX327 you will not get automatic
switching
and flight time information.
Steve
RV7A
Wiring
----- Original Message -----
From: "Scot Stambaugh" <sstambaugh@qualcomm.com>
Subject: Re: AeroElectric-List: Multiple GPS feeds
> --> AeroElectric-List message posted by: Scot Stambaugh
<sstambaugh@qualcomm.com>
>
> Steve,
>
> I just went to the Garmin web site and looked at the GTX327. I couldn't
> find any features that made any use of an interface between the GNS430 and
> GTS327. The GTX330/330D have mode S capability that allows uplink of data
> that can then be sent to the 430 for display.
> What is the nature of the link you are implementing between the 430 and
the
> 327?
>
> scot
>
> At 10:02 PM 4/3/2003 -0500, you wrote:
> >--> AeroElectric-List message posted by: "Steve J Hurlbut"
> ><sjhdcl@kingston.net>
> >
> >Can a GPS antenna feed more than 1 GPS device?
> >
> >Trutrak Flight Systems says no, Garmin says yes.
> >
> >Which is it and anybody have experience doing this?
> >
> >Specically I want to feed GPS signal to my Digitrak autopilot and GTX 327
> >transponder.
> >I have a GPS 35 receiver as recommended by Trutrak Flight Systems.
> >
> >Steve
> >Rv7A
> >Wiring
> >
> >
>
>
Message 20
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|
| Subject: | Re: PM-OV and E-bus switch |
--> AeroElectric-List message posted by: <315@cox.net>
Hi Geoff,
I just ask this same question at B&C a month ago. I learned a bit of the
history of the use of the PM Alternators. B&C had aerobatic pilots who used
them as a primary and sole alternator. The PM-OV was developed for that
design philosophy.
The concept of using the PM alternator as a backup came thru Bob's All
Electric Airplane Article. I learned that once the PM Alternator is
energized it continues to generate current as long as it is rotating. So
that if one were using the PM as a backup and he chose to test its function
during preflight then it would continue to generate even though it was
electrically isolated. It was mentioned that the long term affect of this
was probably not detrimental but B&C had not really tested that.
I Hope I understood correctly and have not mislead you.
Ned
----- Original Message -----
From: "Geoff Evans" <hellothaimassage@yahoo.com>
Subject: AeroElectric-List: PM-OV and E-bus switch
> --> AeroElectric-List message posted by: Geoff Evans
<hellothaimassage@yahoo.com>
>
> Bob. I sent this question to you via email, but perhaps it got lost by the
> wayside. I'll repeat the question here.
>
> I have a question about the B&C PM-OV 14 product.
>
> It looks like all the same stuff you recommed for protecting the SD-8
> alternator, except the relay has extra lugs on it for the light bulb. The
B&C
> website says that, if wired according to their diagram, that the light
will
> illuminate if the alternator switch is left off or if the crowbar trips.
>
> I think I understand how the circuit trips, but I don't understand why you
> would want a light that illuminates when the alternator is turned off...
> Assuming that I'm going to use the SD-8 as a backup alternator, and
following
> your advice about not putting two alternators on the same bus at the same
time,
> why would I want a light that functioned in this manner? The light would
be on
> for all normal operations.
>
> Perhaps this product is designed to be used with the SD-8 when it is the
only
> alternator in the airplane, or when it is running on a separate, isolated
> bus...
>
> ------
>
> On a totally different subject.. What happens in your Z-11 circuit
philosophy
> if the E-bus alternate feed switch is on at the same time the battery
master
> switch is on? It looks to me like absolutely nothing, but I just wanted to
make
> sure.
>
> Thanks.
> -Geoff
>
> RV-8 QB Fuselage
>
> http://tax.yahoo.com
>
>
Message 21
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|
| Subject: | Fw: RV-List: Electrical System Gremlin |
--> AeroElectric-List message posted by: "Tom & Cathy Ervin" <tcervin@valkyrie.net>
List, Worked all day (It's Friday) and nothing was wired wrong or were
there any loose grounds!! My A/P just came down with his handy dandy high
tech equipment and determined either my Van's Amp. Gauge or the Shunt is
Junk!
am drawing about a 4 amp. discharge which he says is about right.
Does anyone know a test that will show if it's the Gauge or
Shunt? If I replace the Amp. Gauge with another 2 1/4" Steam Gauge what have
you had luck with??
Thanks
for all the help! Tom in Ohio
----- Original Message -----
From: "Tom & Cathy Ervin" <tcervin@valkyrie.net>
Subject: Re: RV-List: Electrical System Gremlin
> Seems to be the approach recommended by most. I have Friday off so
> hopefully I will run this down! Boy I thought the Slider was tough.
>
> Tom in Ohio
>
> ----- Original Message -----
> From: "kempthornes" <kempthornes@earthlink.net>
> To: <rv-list@matronics.com>
> Sent: Monday, March 31, 2003 12:02 PM
> Subject: Re: RV-List: Electrical System Gremlin
>
>
> > --> RV-List message posted by: kempthornes <kempthornes@earthlink.net>
> >
> > Tom,
> >
> > I would begin by checking out the amp gauge all by itself. Battery, amp
> > gauge, light bulb, ground. I would continue by testing one item at a
> > time. Pull all fuses, off all breakers, switch off all you can,
> disconnect
> > everything else etc.
> >
> > Concentrate on one bird at a time, don't try to shoot the covey.
> >
> > K. H. (Hal) Kempthorne
> > RV6-a N7HK flying!
> > PRB (El Paso de Robles, CA)
> >
> >
> > At 08:09 PM 3/30/2003 -0500, you wrote:
> > >--> RV-List message posted by: "Tom & Cathy Ervin"
<tcervin@valkyrie.net>
> > >
> > > Any suggestions of where to start looking would be appreciated
> >
> >
> >
> >
> >
> >
> >
> >
>
Message 22
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|
| Subject: | Multiple GPS feeds |
--> AeroElectric-List message posted by: "Ronald Cox" <racox@ix.netcom.com>
Steve:
Why bother?
I bought a couple of GPS antennas which work superbly (on my Garmin 295) for
$20 each on eBay, and they're available on many sites on the net.
Why not just put in another antenna?
Ron Cox
Glasair Super II F/T under construction.
Time: 07:07:31 PM PST US
From: "Steve J Hurlbut" <sjhdcl@kingston.net>
Subject: AeroElectric-List: Multiple GPS feeds
--> AeroElectric-List message posted by: "Steve J Hurlbut"
<sjhdcl@kingston.net>
Can a GPS antenna feed more than 1 GPS device?
Trutrak Flight Systems says no, Garmin says yes.
Which is it and anybody have experience doing this?
Specically I want to feed GPS signal to my Digitrak autopilot and GTX 327
transponder.
I have a GPS 35 receiver as recommended by Trutrak Flight Systems.
Steve
Rv7A
Wiring
Message 23
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|
| Subject: | Re: Fw: RV-List: Electrical System Gremlin |
--> AeroElectric-List message posted by: "Phil Birkelbach" <phil@petrasoft.net>
You should be able to check the shunt with a good voltmeter. Figure out how
many mV you should read with 4 amps and see if you get that accross the
shunt. You could test the voltmeter with a small lamp or something to sink
some current and a different sized resistor. Voltage Drop = Current x
Resistance. Figure the resistor that you would need to get a given voltage
drop which should equal a certain current reading on the gauge.
Godspeed,
Phil Birkelbach
----- Original Message -----
From: Tom & Cathy Ervin <tcervin@valkyrie.net>
Subject: AeroElectric-List: Fw: RV-List: Electrical System Gremlin
> --> AeroElectric-List message posted by: "Tom & Cathy Ervin"
<tcervin@valkyrie.net>
>
> List, Worked all day (It's Friday) and nothing was wired wrong or were
> there any loose grounds!! My A/P just came down with his handy dandy high
> tech equipment and determined either my Van's Amp. Gauge or the Shunt is
> Junk!
> am drawing about a 4 amp. discharge which he says is about right.
> Does anyone know a test that will show if it's the Gauge or
> Shunt? If I replace the Amp. Gauge with another 2 1/4" Steam Gauge what
have
> you had luck with??
>
Thanks
> for all the help! Tom in Ohio
>
>
> ----- Original Message -----
> From: "Tom & Cathy Ervin" <tcervin@valkyrie.net>
> To: <rv-list@matronics.com>
> Subject: Re: RV-List: Electrical System Gremlin
>
>
> > Seems to be the approach recommended by most. I have Friday off so
> > hopefully I will run this down! Boy I thought the Slider was tough.
> >
> > Tom in Ohio
> >
> > ----- Original Message -----
> > From: "kempthornes" <kempthornes@earthlink.net>
> > To: <rv-list@matronics.com>
> > Sent: Monday, March 31, 2003 12:02 PM
> > Subject: Re: RV-List: Electrical System Gremlin
> >
> >
> > > --> RV-List message posted by: kempthornes <kempthornes@earthlink.net>
> > >
> > > Tom,
> > >
> > > I would begin by checking out the amp gauge all by itself. Battery,
amp
> > > gauge, light bulb, ground. I would continue by testing one item at a
> > > time. Pull all fuses, off all breakers, switch off all you can,
> > disconnect
> > > everything else etc.
> > >
> > > Concentrate on one bird at a time, don't try to shoot the covey.
> > >
> > > K. H. (Hal) Kempthorne
> > > RV6-a N7HK flying!
> > > PRB (El Paso de Robles, CA)
> > >
> > >
> > > At 08:09 PM 3/30/2003 -0500, you wrote:
> > > >--> RV-List message posted by: "Tom & Cathy Ervin"
> <tcervin@valkyrie.net>
> > > >
> > > > Any suggestions of where to start looking would be appreciated
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> >
>
>
Message 24
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|
| Subject: | Multiple GPS feeds |
--> AeroElectric-List message posted by: Todd Houg <thoug@attglobal.net>
Actually, GPS devices that support a serial interface typically support the NMEA
data stream protocol. The NMEA protocol defines a continuous stream of data
that the GPS provides. Although the GPS is not "required" to provide all of the
data types defined by the NMEA. For instance, a GPS-35 receiver as Scott mentions
is a complete GPS unit that provides an NMEA data stream. However, you can't
program in a course or waypoints like you can on a panel or handheld GPS.
Thus the GPS-35 has no clue where you want to go, only which way you're going.
As such, it cannot provide cross track error information which is part of the
data stream definition. Thus a GPS-35 cannot drive a Navaid autopilot even with
the smartcoupler because it has no course information to determine if your
off track.
But I digress . . .
The NMEA is a data stream and is not a request protocol as Scott mentions below.
This data stream is a one way communication from GPS to whatever is connected
at the other end. Some GPS's can be configured to send different optional data
types, but this is not done by a device requesting information. The data continually
streams out of teh receiver, and the autopilot/transponder/moving map
just sucks it up. Thus it is possible to hook up this one way data stream to
more than one device as Garmin indicated. As such, a single GPS receiver CAN
drive the NMEA data stream to more than one device. However, If the discussion
with TruTrack was relating to hooking up multiple GPS antenna's, then the answer
to that is no, you can't hookup a single antenna to more than one receiver.
Todd Houg
RV9A - N194TH - reserved
-----Original Message-----
From: Scot Stambaugh [SMTP:sstambaugh@qualcomm.com]
Subject: Re: AeroElectric-List: Multiple GPS feeds
--> AeroElectric-List message posted by: Scot Stambaugh <sstambaugh@qualcomm.com>
Steve,
The GPS 35 is a complete 12 channel GPS receiver, not just an
antenna. once power is applied, it finds satellites and gathers a
longitude and latitude position coordinates as well as developing a error
metric and a number of other variables that it can offer to whatever devise
it is connected to, such as a Trutrak A/P or a Chelton Flight Systems EFIS
or Control Vision's Anywhere moving map package. The interface to the GPS
35 is a RS-232 two way serial connection that reports the various
information to the above instruments. RS-232 is intended to be a
point-to-point protocol, which means one unit on each end of the
cable. Since the above mentioned units assume that there is only one
device on the other end of the cable it only sends the information that is
requested of it. So, consider this situation. If you have one GPS 35 and
you connect it to the Trutrak and also the GTX 327. The GTX 327 may only
request Lat/Lon information and never ask for any of the other data that
the unit makes available, but the Trutrak wants to also request position
error data for example. What could happen is the Trutrack would send a
command to the GPS requesting a position error message and the GPS promptly
replies. The GTX 327 is connected to the same wire and gets the position
error message same as the Trutrak but one of two things will happen. The
design engineer for the GTX 327 assumed that this would always be a
point-to-point connection and that all messages are for him only and would
attempt to decipher the "position error" message as Lat/Lon. It would
either get confused and declare an error, or worse, it would somehow
convince itself that the data string is a Lat/Lon and treat it as
such. Now everything is hosed.
Now, onto your original question, GPS antenna signals should be able to be
split and shared between GPS receivers but the signal is not real
strong. It dissipates over long cable runs and should be carefully managed
when adding additional loads to it such as making it drive two GPS's. You
can purchase GPS amplifiers for long cable runs or just to boost the signal
but you need to know what your doing because if you don't need to boost the
signal that much and you give the GPS receiver too much signal that will
cause signal distortion. A reduction in signal power to the GPS receiver
will usually result in a difficultly for the receiver to detect and acquire
as many satellites. This increases position error and can cause signal
loss conditions more often.
Sorry for the long dissertation. I am in a similar situation, with a GPS
35 driving my CFS EFIS-2000 and needing (but not wanting) a second GPS 35
to drive my Anywhere map PDA system as a backup.
good luck,
scot
At 10:02 PM 4/3/2003 -0500, you wrote:
>--> AeroElectric-List message posted by: "Steve J Hurlbut"
><sjhdcl@kingston.net>
>
>Can a GPS antenna feed more than 1 GPS device?
>
>Trutrak Flight Systems says no, Garmin says yes.
>
>Which is it and anybody have experience doing this?
>
>Specically I want to feed GPS signal to my Digitrak autopilot and GTX 327
>transponder.
>I have a GPS 35 receiver as recommended by Trutrak Flight Systems.
>
>Steve
>Rv7A
>Wiring
>
>
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