Today's Message Index:
----------------------
0. 12:18 AM - What Listers Are Saying... (Matt Dralle)
1. 06:57 AM - Re: TRIM Disconnect Switch (Eric M. Jones)
2. 07:05 AM - Re: TRIM Disconnect Switch (Hinde, Frank George (Corvallis))
3. 07:14 AM - Batteries (Kevin Boddicker)
4. 08:20 AM - Re: TRIM Disconnect Switch (marcausman)
5. 08:29 AM - Garmin Power Requirements (George, Neal E Capt MIL USAF 605TES/TSI)
6. 08:56 AM - Re: Re: TRIM Disconnect Switch (Dan Morrow)
7. 09:08 AM - Re: [Probable SPAM] Re: TRIM Disconnect Switch ()
8. 09:23 AM - Re: Garmin Power Requirements ()
9. 09:36 AM - Re: Re: TRIM Disconnect Switch (Kenneth Melvin)
10. 10:07 AM - Re: 496 Audio--easy fix (Dave Saylor)
11. 01:18 PM - Re: Questions on Z-16 Diagram (vozzen)
12. 02:45 PM - Re: 496 Audio--easy fix (Fisher Paul A.)
13. 03:13 PM - CH701 Rotax 912 (John Swanson)
14. 03:26 PM - Re: 496 Audio--easy fix (Vernon Little)
15. 04:04 PM - Re: CH701 Rotax 912 (Robert L. Nuckolls, III)
16. 04:12 PM - Re: Re: TRIM Disconnect Switch (Robert L. Nuckolls, III)
17. 04:14 PM - Re: Re: Questions on Z-16 Diagram (Robert L. Nuckolls, III)
18. 05:25 PM - New product announcement (Robert L. Nuckolls, III)
19. 07:47 PM - Re:496 Audio--easy fix (Emrath)
20. 07:47 PM - Re:496 Audio--easy fix (Emrath)
21. 09:07 PM - Re: New product announcement (Jim Dabney)
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Subject: | What Listers Are Saying... |
November is Matronics List Fund Raiser month and a number people been sending some
really nice comments regarding the Lists. I thought I'd share a few below.
The Lists are completely supported by your Contributions. All of the bills for
new hardware, connectivity, and electricity are paid by the generous support
of the List members.
Please make your Contribution today to support the continued operation of the List
and Forums:
http://www.matronics.com/contribution
Thank you!
Matt Dralle
Matronics Email List Administrator
================= What Listers Are Saying ================
Flying and building is much safer with this List!!
Robert D.
Thanks for having and maintaining such a great resource to
all of us builders and flyers.
Wayne E.
Love the fact that you haven't caved to advertising!
Peter J.
..a great resource!!
Robert C.
Not building at the moment, but the Lists keeps me right
up to date with what's going on.
Chris D.
The web forum has been running great.
James O.
I enjoy this [List] site very much...
Paul C.
This is a great list!
Albert G.
..a valuable resource!
Roger C.
I am deployed to Pakistan right now, and being able
to go on-line and keep up with the aircraft discussions
helps keep the aircraft building dream alive in my mind!
Gregory C.
..fantastic service!
Roger M.
..clearly a work of passion!
Mike C.
It is a great service to us!
Kevin C.
The list is a wonderful resource...
Ralph O.
[The Lists] have been the single greatest resource in
building my RV-9A and now my RV-10.
Albert G.
..a valuable and always improving service.
Dick S.
STILL THE BEST BARGAIN AROUND!!
Owen B.
..such a valuable tool.
Jon M.
[The Lists] have been an invaluable resource for me
as a Zenith homebuilder.
David G.
The opportunity to meet (on line at least) many other
interesting builders and to make some new friends is
truly appreciated.
Albert G.
Message 1
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Subject: | Re: TRIM Disconnect Switch |
Runaway trim....I agree with those who point out that the aircraft's maximum trim
should still be flyable. But the problem still needs fixing.
I would also like to point out that one should use environmentally-sealed switches
for stick-grip trim switches. A sweaty hand on non-sealed switches leads to
early failure.
I have worked on a system that used the "watchdog" idea from computers where the
trim system has to get a periodic signal from the controller, otherwise the
trim actuator resets to some "safe" position. This is trivial to do.
I have also sold plenty of my "True Servo Conversion for MAC/RAC". These seem to
be a great way to make the MAC/RAC trim box work like the Cessna trim wheel.
But recently I have doubted the utility of the elevator trim at all. Why bother?
Well...so the pilot won't have to push on the stick constantly. This leads to fatigue.
So how about putting a strain gauge on the elevator cable (perhaps near
the trim box) and auto-trimming the elevator to remove the force on the stick?
Easy to do, and one more pilot distraction eliminated. Anybody want a patent?
"When the Oakies left Oklahoma and moved to California,
it raised the I.Q. of both states."
--Will Rogers
--------
Eric M. Jones
www.PerihelionDesign.com
113 Brentwood Drive
Southbridge, MA 01550
(508) 764-2072
emjones@charter.net
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=144404#144404
Message 2
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Subject: | TRIM Disconnect Switch |
And if you have a fast airplane like an RV or Glassair and the stick
forces get too high then simply slow down.
I certainly would not bother with another switch.
Frank
RV 7a
________________________________
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of
Robert McCallum
Sent: Tuesday, November 06, 2007 6:06 PM
Subject: Re: AeroElectric-List: TRIM Disconnect Switch
Trim runaway should hopefully be of minor concern for several reasons.
1; The likelihood of it happening is very low. (probably not worth
worrying about)
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Bob,
A few weeks back someone on the list posted a url for some low priced
AA and AAA cells.
You asked him to send some to you for evaluation, if he made the
purchase.
I did indeed make that purchase. If the other lister has not send you
any cells, I would be happy to. They are from Batteries dot com. 500
cells for $49.99 + $11.98 shipping. Thats 12.3 cents per cell
delivered! The cells have a 12 2012 out date. I was concerned that
they might be short dated for that price.
If you would like to hook them up to your battery runner downer I
please let me know, I will send some to you.
Kevin Boddicker
Tri Q 200 N7868B 77.9 hours
Luana, IA.
Message 4
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Subject: | Re: TRIM Disconnect Switch |
The electric trim on my RV-7 is run by the Vertical Power system. The trim motors
are controlled with solid-state switches - no mechanical relays. It provides
runaway trim protection (stops the motor) by simply holding down the opposite
trim switch, then after 3 seconds it disconnects the trim switches. You can
then use the backup switches on the display to return the trim back to a neutral
position. There is also a visual indicator when the trim is running, and soon
audio as well. And it's all simpler to wire than a conventional system with
mechanical relays. Of course it's part of a broader system - you can;t buy just
the trim alone - but the whole point is to make overall wiring alot simpler.
--------
Marc Ausman
http://www.verticalpower.com
RV-7 IO-390 Flying
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=144418#144418
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Subject: | Garmin Power Requirements |
Listers -
Do any of you have actual, measured current draws for Garmin radio
equipment? Specifically, I'd like to see the "idling" receive-mode
current draws for GNS-430, SL-30 and GTX-327. I'm not looking for
recommended fuse ratings - I have those. I'm looking for "real,"
observed power requirements in an effort to properly assess my true
alternator size requirement.
Neal
RV-7 N8ZG
Gluing Canopy
Message 6
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Subject: | Re: TRIM Disconnect Switch |
>From my reading of aviation magazines, I gather the BIG airplanes often
come with auto-trim systems. It's a good idea but probably already patented
or covered by "prior art".
----- Original Message -----
From: "Eric M. Jones" <emjones@charter.net>
Sent: Wednesday, November 07, 2007 6:53 AM
Subject: AeroElectric-List: Re: TRIM Disconnect Switch
> <emjones@charter.net>
> Well...so the pilot won't have to push on the stick constantly. This leads
> to fatigue. So how about putting a strain gauge on the elevator cable
> (perhaps near the trim box) and auto-trimming the elevator to remove the
> force on the stick? Easy to do, and one more pilot distraction eliminated.
> Anybody want a patent?
>
Message 7
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Subject: | Re: TRIM Disconnect Switch |
Another good reason to go Vertical. I will be doing the same thing.
Remember the Ray Allen sticks operate on the principle of shorting out
the connection to move the trim, so a short represents a signal to move.
A dead short will also cause the servo to go nuts, so short prevention
is the best design goal.
A panic switch may be used to open the system completely. That could be
on the panel with a big red button rather than using a spot on the
stick. If the trim has already moved substantially before you hit the
panic button, you need to fight it to the ground to land. Inconvenient,
but not dangerous unless your load is imbalanced - pretty messy in the
wind too. Once on the ground put a nut/bolt through the gap to guarantee
it won't move on the way home.
Another option for TruTrak users is to buy the automatic trim controller
system which incorporates a fail-safe runaway feature.
Somebody should design a feature that returns the servo to neutral when
disconnect from power. Now there's an idea.
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of
marcausman
Sent: Wednesday, November 07, 2007 11:17 AM
Subject: [Probable SPAM] AeroElectric-List: Re: TRIM Disconnect Switch
--> <marc@verticalpower.com>
The electric trim on my RV-7 is run by the Vertical Power system. The
trim motors are controlled with solid-state switches - no mechanical
relays. It provides runaway trim protection (stops the motor) by simply
holding down the opposite trim switch, then after 3 seconds it
disconnects the trim switches. You can then use the backup switches on
the display to return the trim back to a neutral position. There is also
a visual indicator when the trim is running, and soon audio as well. And
it's all simpler to wire than a conventional system with mechanical
relays. Of course it's part of a broader system - you can;t buy just the
trim alone - but the whole point is to make overall wiring alot simpler.
--------
Marc Ausman
http://www.verticalpower.com
RV-7 IO-390 Flying
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=144418#144418
Message 8
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Subject: | Garmin Power Requirements |
Vertical readily shows those values. Not sure if you're in a hurry ?? I
am not quite setup, but I will make a note of those items when complete.
Differences, I have a 530, sl30 and gtx330, but they should be similar.
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of
George, Neal E Capt MIL USAF 605TES/TSI
Sent: Wednesday, November 07, 2007 11:25 AM
Subject: AeroElectric-List: Garmin Power Requirements
Listers -
Do any of you have actual, measured current draws for Garmin
radio equipment? Specifically, I'd like to see the "idling"
receive-mode current draws for GNS-430, SL-30 and GTX-327. I'm not
looking for recommended fuse ratings - I have those. I'm looking for
"real," observed power requirements in an effort to properly assess my
true alternator size requirement.
Neal
RV-7 N8ZG
Gluing Canopy
Message 9
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Subject: | Re: TRIM Disconnect Switch |
The Tru-Trak autopilots already offer such an auto-trim function. Works
magnificently.
Kenneth Melvin
RV9A
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Subject: | 496 Audio--easy fix |
You can run the XM volume up and down by tapping the power button and
scrolling left/right. QUIT to exit. Not quite as easy as a knob but at
least it's all there already.
_____
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of
N81JG@aol.com
Sent: Tuesday, November 06, 2007 5:52 PM
Subject: Re: AeroElectric-List: 496 Audio--easy fix
HI Dave,
I just got my RV7A panel all together and the XM antenna working. When I
turned on the XM, radio and intercom ( I don't have an audio panel since I
have only an SL30) I had the XM come on at high volume. I then noted that
there was no volume control for the XM other than the intercom or headset
controls. The GPS warning came through clear. I guess I will have to place a
potentiometer in the GPS 1/8" output line to control the XM volume. Does
anyone know how and where I get the right pot to do the volume control? I
decided when I wired the Flightcom intercom and set the dip switches I
didn't want the music to mute each time the radio or intercom squelch was
broken so I will have to keep the music volume toned down so I will not miss
any reception or warning. Oh, I guess the warnings will be toned down with
the music. I'll have to see how that works. Mainly I want to be able to
control XM music volume independent of the radio.
John Greaves
RV7A nearing completion
VariEze N81JG nearing replacement of overhauled engine
Redding, CA
_____
See what'
Message 11
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Subject: | Re: Questions on Z-16 Diagram |
>What problems have you deduced for wiring
as suggested?
None-- looks great. I was using the outdated Rev.K, which showed C-lead coming
thru the OV trip breaker circuit, instead of direct from battery (via Master
Sw).
Thanks, Bob, for your continuing attention.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=144466#144466
Message 12
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Subject: | 496 Audio--easy fix |
Dave,
Thank you for posting your solution. I had kept your original note because
I intend to do the same thing you described. My intention was when I got
closer I would contact you to see where you ended up. Now I'll just keep t
his one!
I'm glad to hear you got everything working. Your solution was certainly n
ot intuitively obvious (meaning I would have never figured it out!).
Thanks for being the pioneer!
Paul A. Fisher
RV-7A (still finishing!)
________________________________
From: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelectr
ic-list-server@matronics.com] On Behalf Of Dave Saylor
Sent: Tuesday, November 06, 2007 18:02
Subject: AeroElectric-List: 496 Audio--easy fix
We have the audio working as desired from the 496. It turned out to be a v
ery simple solution.
To recount:
It was my intention to have terrain warnings from a Garmin 496 wired to the
unswitched audio input of a Garmin GMA340 audio panel.
Garmin sells a "power/data cable" that provides wiring for audio output alo
ng with serial data and 12VDC to power the GPS. The audio wires are labele
d "voice+" and "voice-". Garmin also sells a similar cable that terminates
in a speaker housed adjacent to a 12V plug for using in the car. I took t
he speaker housing apart and confirmed that the voice+/- wires connected to
the speaker.
When we ran the voice wires into the audio panel, we got nothing. We tried
several approaches, including running the audio into DME (nothing), ADF (n
othing), though an audio transformer, though a potentiometer and through va
rious simple resistors (zip, zero, nada). Just dead air from the 496.
Finally, Jacek Kesy, who works at AirCrafters, discovered that when the "vo
ice-" wire from the GPS was disconnected from the audio panel, everything w
orked perfectly. Audio must be grounding somewhere else, and the wire that
certainly seems like audio ground is actually "audio disable". Once the v
oice- wire is grounded, you have to turn the 496 off and back on to get any
audio.
Here is how the final scenario is wired:
1/8" audio jack is wired to Music 1 on the audio panel. It outputs warning
s and XM audio. Music 1 is muted by intercom activity or incoming transmis
sions.
As an aside, I also have a 1/8" audio jack wired through a toggle so I can
select either XM or some other source for Music 1. But that has no bearing
on the 496 audio problem.
>From the 496 power/data cable, the "voice+" wire ties to a 220 ohm resistor
, then to the unswitched audio input at the audio panel. The only other un
switched audio input is from the EFIS. It also goes through a 220 ohm resi
stor. Perhaps someone else can tell us what exactly the 220 ohm resistors
do--my understanding is that they balance the two audio signals. I don't k
now what would happen without them.
So now, even though the warnings coming from Music 1 are at time muted, I a
lways get the EFIS warnings and the terrain warnings, as long as the audio
panel is on.
There are a bunch of setup parameters for the 496 as well on the Sound page
of the main menu. Those are all pretty intuitive and seem to mostly effec
t the audio jack, not the output to the power/data cable.
So that's it. Problem solved basically by trial and error, but it's workin
g the way I want it to now.
Dave Saylor
AirCrafters LLC
140 Aviation Way
Watsonville, CA
831-722-9141
831-750-0284 CL
www.AirCraftersLLC.com
Message 13
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|
Installing Rotax 912 into CH701.
Trying to wire the switch to the Mags. How do i install the flat pin
terminal
to the shielded wire?
What tool do i need?
Thanks
John
seems as if the last 10% takes longer
Message 14
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Subject: | 496 Audio--easy fix |
For anyone who knows: I wired my GPSMap 296 this way about 2 years ago
using my Sigtronics SPA-400 intercom and the Vx-Aviation AMX-1A Audio
Bus,
hoping that Garmin would introduce voice warnings on the 296. The audio
works fine: I get a voice alarm when power fails and a voice prompt
when I
change volume. I don't get any other voice warnings, however.
I imagine the 496 and 296 share a lot of common code, so I would expect
the
296 to have voice warnings as well.
Has anyone been successful in getting voice warnings from the 296, or am
I
doomed to upgrade to a 496 to get this feature?
Thanks, Vern Little
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of
Fisher
Paul A.
Sent: November 7, 2007 2:40 PM
Subject: RE: AeroElectric-List: 496 Audio--easy fix
Dave,
Thank you for posting your solution. I had kept your original note
because
I intend to do the same thing you described. My intention was when I
got
closer I would contact you to see where you ended up. Now I'll just
keep
this one!
I'm glad to hear you got everything working. Your solution was
certainly
not intuitively obvious (meaning I would have never figured it out!).
Thanks for being the pioneer!
Paul A. Fisher
RV-7A (still finishing!)
_____
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Dave
Saylor
Sent: Tuesday, November 06, 2007 18:02
Subject: AeroElectric-List: 496 Audio--easy fix
We have the audio working as desired from the 496. It turned out to be
a
very simple solution.
To recount:
It was my intention to have terrain warnings from a Garmin 496 wired to
the
unswitched audio input of a Garmin GMA340 audio panel.
Garmin sells a "power/data cable" that provides wiring for audio output
along with serial data and 12VDC to power the GPS. The audio wires are
labeled "voice+" and "voice-". Garmin also sells a similar cable that
terminates in a speaker housed adjacent to a 12V plug for using in the
car.
I took the speaker housing apart and confirmed that the voice+/- wires
connected to the speaker.
When we ran the voice wires into the audio panel, we got nothing. We
tried
several approaches, including running the audio into DME (nothing), ADF
(nothing), though an audio transformer, though a potentiometer and
through
various simple resistors (zip, zero, nada). Just dead air from the 496.
Finally, Jacek Kesy, who works at AirCrafters, discovered that when the
"voice-" wire from the GPS was disconnected from the audio panel,
everything
worked perfectly. Audio must be grounding somewhere else, and the wire
that
certainly seems like audio ground is actually "audio disable". Once the
voice- wire is grounded, you have to turn the 496 off and back on to get
any
audio.
Here is how the final scenario is wired:
1/8" audio jack is wired to Music 1 on the audio panel. It outputs
warnings
and XM audio. Music 1 is muted by intercom activity or incoming
transmissions.
As an aside, I also have a 1/8" audio jack wired through a toggle so I
can
select either XM or some other source for Music 1. But that has no
bearing
on the 496 audio problem.
>From the 496 power/data cable, the "voice+" wire ties to a 220 ohm
resistor,
then to the unswitched audio input at the audio panel. The only other
unswitched audio input is from the EFIS. It also goes through a 220 ohm
resistor. Perhaps someone else can tell us what exactly the 220 ohm
resistors do--my understanding is that they balance the two audio
signals.
I don't know what would happen without them.
So now, even though the warnings coming from Music 1 are at time muted,
I
always get the EFIS warnings and the terrain warnings, as long as the
audio
panel is on.
There are a bunch of setup parameters for the 496 as well on the Sound
page
of the main menu. Those are all pretty intuitive and seem to mostly
effect
the audio jack, not the output to the power/data cable.
So that's it. Problem solved basically by trial and error, but it's
working
the way I want it to now.
Dave Saylor
AirCrafters LLC
140 Aviation Way
Watsonville, CA
831-722-9141
831-750-0284 CL
www.AirCraftersLLC.com
.matronics.com/contribution
ist">http://www.matronics.com/Navigator?AeroElectric-List
ics.com
Message 15
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Subject: | Re: CH701 Rotax 912 |
At 06:04 PM 11/7/2007 -0500, you wrote:
>Installing Rotax 912 into CH701.
>Trying to wire the switch to the Mags. How do i install the flat pin terminal
>to the shielded wire?
>What tool do i need?
I presume you're wrestling with the shield connection.
No special tools needed. You need to convert the shield
braid into wire like so:
http://aeroelectric.com/articles/pigtail/pigtail.html
Once both conductors at the end of your shielded
wire are "plain wire", you can use the standard
PIDG terminals and appropriate tool.
Bob . . .
Message 16
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Subject: | Re: TRIM Disconnect Switch |
>
>But recently I have doubted the utility of the elevator trim at all. Why
>bother?
>
>Well...so the pilot won't have to push on the stick constantly. This leads
>to fatigue. So how about putting a strain gauge on the elevator cable
>(perhaps near the trim box) and auto-trimming the elevator to remove the
>force on the stick? Easy to do, and one more pilot distraction eliminated.
>Anybody want a patent?
Demonstrated this for Lear about 30 years ago.
They had a flight test aircraft fitted with
a pilot pitch effort strain gage. We closed the
loop on stick force and used the servoed trim
system I'd already certified. The pilot held an
AUTO TRIM button on the stick. He would hand-fly
to desired pitch condition and the trim system would
be constantly driving to take force out of the
stick. Worked great, marketing couldn't see enough
demand to justify developing it into a product.
But that was on Lears and 30 years ago, we're working
a whole new market now.
Bob . . .
Message 17
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Subject: | Re: Questions on Z-16 Diagram |
At 01:15 PM 11/7/2007 -0800, you wrote:
>
> >What problems have you deduced for wiring
>as suggested?
>
>None-- looks great. I was using the outdated Rev.K, which showed C-lead
>coming thru the OV trip breaker circuit, instead of direct from battery
>(via Master Sw).
>
>Thanks, Bob, for your continuing attention.
No problem . . . and I wasn't trying to challenge you
on the 'modification' . . . I'm just trying to be
sensitive to errors in my perceptions and
evolution in new products.
Bob . . .
Message 18
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Subject: | New product announcement |
I wasn't predicting this item to be the first
new product on the website this year but I had
a need for the device in some other activities.
Production parts are on order and bench testing is
far enough along to bolster my confidence that
this 20A Solid State Relay is ready to go up on
the website. It will probably be about 30 days
before I can take orders. I don't build products
here any more and my production house needs
some time. We'll probably build 100 of these for
the first batch.
In the mean time, I'd be pleased to answer
any questions about it. See:
http://aeroelectric.com/Catalog/AECcatalog.html
This product uses a newly developed, standard
package philosophy that reduces assembly time
It also reduces time needed to get new products
on the market. The electronics are easy, the
packaging can be a real cost driver. There's a
stream of 6 or so so new devices on burners
that will fit into this same package or the next
size up.
Bob . . .
----------------------------------------
( "Problems are the price of progress. )
( Don't bring me anything but trouble. )
( Good news weakens me." )
( -Charles F. Kettering- )
----------------------------------------
Message 19
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Subject: | RE:496 Audio--easy fix |
John,
I believe, if you are using a Garmin portable held for the XM feed, there
are some settings on the "Sound" page to control the volume.
Time: 05:52:53 PM PST US
From: N81JG@aol.com
Subject: Re: AeroElectric-List: 496 Audio--easy fix
HI Dave,
I just got my RV7A panel all together and the XM antenna working. When I
turned on the XM, radio and intercom ( I don't have an audio panel since I
have
only an SL30) I had the XM come on at high volume. I then noted that there
was
no volume control for the XM other than the intercom or headset controls.
The GPS warning came through clear. I guess I will have to place a
potentiometer in the GPS 1/8" output line to control the XM volume. Does
anyone know how
and where I get the right pot to do the volume control? I decided when I
wired the Flightcom intercom and set the dip switches I didn't want the
music to
mute each time the radio or intercom squelch was broken so I will have to
keep the music volume toned down so I will not miss any reception or
warning.
Oh, I guess the warnings will be toned down with the music. I'll have to
see
how that works. Mainly I want to be able to control XM music volume
independent
of the radio.
John Greaves
RV7A nearing completion
VariEze N81JG nearing replacement of overhauled engine
Redding, CA
Marty
Message 20
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Subject: | RE:496 Audio--easy fix |
Dave,
First, thank you for your diligence in this matter and for sharing your
knowledge openly on this list.
If I understand your comments below the "Voice -" line from the 496 is left
open, right?
I think the only reason for the 220 ohm resistor may be due to having the
EFIS voice on the same input connection. I think Bob has commented on this
before on this list or it may be in his book, I seem to recall something
about this in his audio amplifier section dealing with audio isolation.
Bob, can you "weigh-in" on this issue?
Marty
Time: 04:03:32 PM PST US
From: "Dave Saylor" <Dave@AirCraftersLLC.com>
Subject: AeroElectric-List: 496 Audio--easy fix
We have the audio working as desired from the 496. It turned out to be a
very simple solution.
To recount:
It was my intention to have terrain warnings from a Garmin 496 wired to the
unswitched audio input of a Garmin GMA340 audio panel.
Garmin sells a "power/data cable" that provides wiring for audio output
along with serial data and 12VDC to power the GPS. The audio wires are
labeled "voice+" and "voice-". Garmin also sells a similar cable that
terminates in a speaker housed adjacent to a 12V plug for using in the car.
I took the speaker housing apart and confirmed that the voice+/- wires
connected to the speaker.
When we ran the voice wires into the audio panel, we got nothing. We tried
several approaches, including running the audio into DME (nothing), ADF
(nothing), though an audio transformer, though a potentiometer and through
various simple resistors (zip, zero, nada). Just dead air from the 496.
Finally, Jacek Kesy, who works at AirCrafters, discovered that when the
"voice-" wire from the GPS was disconnected from the audio panel, everything
worked perfectly. Audio must be grounding somewhere else, and the wire that
certainly seems like audio ground is actually "audio disable". Once the
voice- wire is grounded, you have to turn the 496 off and back on to get any
audio.
Here is how the final scenario is wired:
1/8" audio jack is wired to Music 1 on the audio panel. It outputs warnings
and XM audio. Music 1 is muted by intercom activity or incoming
transmissions.
As an aside, I also have a 1/8" audio jack wired through a toggle so I can
select either XM or some other source for Music 1. But that has no bearing
on the 496 audio problem.
>From the 496 power/data cable, the "voice+" wire ties to a 220 ohm
>resistor,
then to the unswitched audio input at the audio panel. The only other
unswitched audio input is from the EFIS. It also goes through a 220 ohm
resistor. Perhaps someone else can tell us what exactly the 220 ohm
resistors do--my understanding is that they balance the two audio signals. I
don't know what would happen without them.
So now, even though the warnings coming from Music 1 are at time muted, I
always get the EFIS warnings and the terrain warnings, as long as the audio
panel is on.
There are a bunch of setup parameters for the 496 as well on the Sound page
of the main menu. Those are all pretty intuitive and seem to mostly effect
the audio jack, not the output to the power/data cable.
So that's it. Problem solved basically by trial and error, but it's working
the way I want it to now.
Dave Saylor
AirCrafters LLC
140 Aviation Way
Watsonville, CA
831-722-9141
831-750-0284 CL
www.AirCraftersLLC.com
Message 21
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Subject: | Re: New product announcement |
Bob,
Will this new solid state relay be suitable for use as the alternator
relay for the SD-8 (Z-13) or for the alternator relay for a Jabiru 20
amp alternator, replacing relay S704-1? As I recall, you said in your
Houston class that the solid state relays have much lower holding
current than conventional relays.
Jim
At 08:23 PM 11/7/2007, you wrote:
><nuckolls.bob@cox.net>
>
>I wasn't predicting this item to be the first
>new product on the website this year but I had
>a need for the device in some other activities.
>
>Production parts are on order and bench testing is
>far enough along to bolster my confidence that
>this 20A Solid State Relay is ready to go up on
>the website. It will probably be about 30 days
>before I can take orders. I don't build products
>here any more and my production house needs
>some time. We'll probably build 100 of these for
>the first batch.
>
>In the mean time, I'd be pleased to answer
>any questions about it. See:
>
>http://aeroelectric.com/Catalog/AECcatalog.html
>
>This product uses a newly developed, standard
>package philosophy that reduces assembly time
>It also reduces time needed to get new products
>on the market. The electronics are easy, the
>packaging can be a real cost driver. There's a
>stream of 6 or so so new devices on burners
>that will fit into this same package or the next
>size up.
>
>
> Bob . . .
>
> ----------------------------------------
> ( "Problems are the price of progress. )
> ( Don't bring me anything but trouble. )
> ( Good news weakens me." )
> ( -Charles F. Kettering- )
> ----------------------------------------
>
>
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