Today's Message Index:
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1. 06:33 AM - Re: Re: Vans RPM Transducer IE VTACHGEN 12 (Robert L. Nuckolls, III)
2. 08:20 AM - Re: Vans RPM Transducer IE VTACHGEN 12 (Bubblehead)
3. 08:38 AM - Re: Vans RPM Transducer IE VTACHGEN 12 (Bubblehead)
4. 10:37 AM - Re: power wires to strobe power supply (MHerder)
5. 04:32 PM - Re: Re: power wires to strobe power supply (Robert L. Nuckolls, III)
6. 08:20 PM - Re: Re: 9024 questions (Robert L. Nuckolls, III)
7. 09:14 PM - Re: power wires to strobe power supply (MHerder)
Message 1
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| Subject: | Re: Vans RPM Transducer IE VTACHGEN 12 |
At 03:12 PM 9/29/2010, you wrote:
>
>Gosh. I feel so chastised.
>
>You're welcome for the help by the way. Try 1 pulse per revolution (PPR).
I'd be surprised if it were that low a number. When
sampling data for processing and then working with
the result to do something useful (like put numbers
on a screen) in real time you would like to have the
highest practical number of samples/second. I've
designed components of several tach systems, one of
the first being for Bonanzas and Barons when they
went to the "turbine style", 2-inch instruments. As
I recall, the transducer we built had 8 magnets flying
past a hall-effect transducer.
There ARE numerous techniques for resolving engine
RPM from about ANY number of pulses per revolution
but the lower you go, the more "wiggle" you get in
the display . . . or if you filter the wiggle out,
the display lags several seconds behind real numbers
as you try to adjust RPM.
It's VERY likely that the transducer in question is
a hall device which means you can hook it up with a
simple power supply and voltmeter on the bench and
just count the transitions as you rotate the shaft.
The sad feature in this discussion is that well
known and highly respected suppliers of goodies to
the OBAM aviation community cannot tell you anything
about the device they sold you. Lest anyone think
I'm picking on Van, know that the problem is pandemic
in the aviation community. Even the "big guys" suffer
from the malady.
Bob . . .
Message 2
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| Subject: | Re: Vans RPM Transducer IE VTACHGEN 12 |
Bob,
While I agree with all of your logic, Dynon Support says that the setting "1 PPR"
will work. It seems like before we go through lots of bench testing and hassle
we at least give that setting a chance. After all, this is just RPM. We
know that a Lyc should idle at about 600 to 1000 rpm. We would quickly know
if it is off by 2 or by 1/2 or is completely bogus. For instance, if the device
was putting out 360 pulses per rev (1 per degree) we would see the Dynon display
360000 at 1000 actual rpm.
I think too that perhaps we are thinking that this is a position encoder with many
pulses per revolution. It is not a position encoder, just a simple revolution
encoder that is used on a great many tachometers on many different vehicles.
Lots of people use the Dynon 180 and apparently have solved this riddle. I think
we're making it harder than it needs to be. We are solving a question that
does not even need to be answered.
--------
John Dalman
Keller, TX
RV-8 N247TD
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=314223#314223
Message 3
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| Subject: | Re: Vans RPM Transducer IE VTACHGEN 12 |
Here are some links that may provide some clues.
Here is a manufacturer of a tach drive unit that appears to be identical in appearance
to what Vans and others sell. Perhaps someone could contact them and
see if they supply Vans and then get a data sheet.
http://www.dakotadigital.com/index.cfm/page/ptype=product/product_id=109/category_id=311/home_id=59/mode=prod/prd109.htm
Here's a source
http://www.phoenixtuning.com/zenstore/index.php?main_page=product_info&cPath=3_34&products_id=459&zenid=aov3bkbts67jf26s7eenvttqa2
One on eBay
http://cgi.ebay.com/ebaymotors/DAKOTA-DIGITAL-GM-8K-PULSE-GENERATOR-SENDER-SEN-01-1-_W0QQcmdZViewItemQQitemZ370370121423QQptZMotorsQ5fCarQ5fTruckQ5fPartsQ5fAccessories
A data sheet (no info on pulses)
http://www.dakotadigital.com/PDF/SEN-01-1.PDF
Another source
http://www.summitracing.com/parts/DAK-SEN-01-1/
Depending on what source you look at they say it is either 8 pulses or 8000 pulses
per revolution.
I've looked through all my pictures of the encoder I installed on my -8 and I cannot
see a model number.
The setting that works on my EIS (yes, I know it's not a 180) is "4".
I hope some of this helps.
--------
John Dalman
Keller, TX
RV-8 N247TD
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=314225#314225
Message 4
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| Subject: | Re: power wires to strobe power supply |
I'm using aeroflash strobes, with non shielded wire. I'm gettng the whoop whop
whine sound. I've kept the wires away from the antanna as best as possible.
I've attached as close to the positve side of the terminal as possible and still
the sound. It comes through with the intercom on or off. The aeroflash
power supply comes with a ground lead, this is the only area that I have not used
a return all the way to the ground and I regret it now, and they are at my
wing tips. Should I have gone directly to the ground tabs with an actual wire,
would this make a difference in the sound.
--------
One Rivet at a Time!
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=314235#314235
Message 5
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| Subject: | Re: power wires to strobe power supply |
At 12:31 PM 9/30/2010, you wrote:
><michaelherder@beckgroup.com>
>
>I'm using aeroflash strobes, with non shielded wire. I'm gettng the
>whoop whop whine sound. I've kept the wires away from the antanna
>as best as possible. I've attached as close to the positve side of
>the terminal as possible and still the sound. It comes through with
>the intercom on or off. The aeroflash power supply comes with a
>ground lead, this is the only area that I have not used a return all
>the way to the ground and I regret it now, and they are at my wing
>tips. Should I have gone directly to the ground tabs with an actual
>wire, would this make a difference in the sound.
It takes TWO connections to LOOP. The fact that you
hear the noise with the intercom OFF sugests that your
headset jacks are not insulated from airframe ground.
Have you installed insulating washers on your headset
and microphone jacks?
Bob . . .
Message 6
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| Subject: | Re: 9024 questions |
> :)
>I look forward to you having the time again to shepherd AEL, but in
>the mean time I'm happily grazing on the grass in front of me and
>wish you and your family the absolute best of medical outcomes.
Thanks to all for their concerns and best wishes. Actually,
since my consulting clientele are either comatose or
slipping fast, I may actually have more time to devote to
AEC manufacturing.
I must confess also that I've been spending a lot of time
writing a book on ideas and issues for another forum.
That activity will be launched on a dedicated website
in the not too distant future. I do not have enough content
gathered together to fuel the launch. I'll announce the
activation of our sister website probably within the next
couple months. There will be a companion list-server for
that activity as well. Individuals interested in this activity
can watch the front page of aeroelectric.com for the launch
announcement.
In the mean time, I've just about got all the AEC manufacturing
ops loaded into my van and I've got a two-hour drive to figure
out how and where I'm going to get it set up in M.L. My volume
and floor space suited to electronics is about 1/3rd of what
I had in Wichita!
On the other side of that coin, I have a really nice wood shop.
I've been fabricating cabinets and remodeling patches for a house
Dr. Dee has in Lindsborg where she teaches. Had a high-priority
distraction this morning . . . my 3-year old grandson is learning
how to do "grandpa's famous scrambled eggs."
Bob . . .
Message 7
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| Subject: | Re: power wires to strobe power supply |
I've only insulated my mic jacks. I guess I'll insulationg my headph one jacks
too. Let me clarify this.... I hear the noise with the intercom on or off.
When the intercom is off it is bypassing the intercom in failsafe mode.
Flightcom 403 w/ stereo, Garmin SL 30 radio, Aeroflash strobes
--------
One Rivet at a Time!
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=314288#314288
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