Today's Message Index:
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1. 03:45 AM - led trim display (bob noffs)
2. 04:09 AM - Re: Re: Cessna dual electronic stall/gear warning horn (Robert L. Nuckolls, III)
3. 08:30 AM - Re: led trim display (Eric M. Jones)
4. 09:37 AM - Re: New Electronic Device "Smart" Charging Source (jonlaury)
5. 01:05 PM - Re: Re: Cessna dual electronic stall/gear warning horn (Robert L. Nuckolls, III)
Message 1
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Subject: | led trim display |
i have a ray allen trim display. it has a vertical row of led's. when i
keey the mike [pilot or passenger ptt] the led that was lit brightly goes
out and the top led lights up but dimly. is this wiring or interference
from transmission? radio and indicator otherwise work perfect.
bob noffs
Message 2
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Subject: | Re: Cessna dual electronic stall/gear warning |
horn
> From this data I deduce that input #1 is always ported
> to both speakers (if connected) and headset audio
> irrespective of condition for any system controls.
Does your PMA8000 already drive the speakers?
If so, there is risk for creating a feed-back
loop in your audio system if speaker signals
are sampled and fed back into on of the system's
inputs.
Most pilots with sophisticated audio systems
use headsets but in your case, you'll want
to make sure that your PMA8000 speaker driving
features are turned off. As I mentioned earlier,
without wiring diagrams for the as-installed
system, it's a challenge to catch all the
'rats in the woodpile'.
Bob . . .
Message 3
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Subject: | Re: led trim display |
I like Ray Allen stuff, but the RP3 indicator and the trim boxes have limitations.
One of them is that the full-scale voltage returned from the trim box pot
is 1.2V. This is an issue when the wiring is close to the transmitter because
the voltages are way down in the RFI/EMI mud. The other is the nature of the LED
bar graph, which is an old design that can only get so bright, and updates
to the design, like an LCD aren't happening.
See attached schematic.
My approach was to eliminate the indicator and turn the "trim box" into a true
servo. I designed the TSCMR, true servo control to do that. Alternatively, I designed
a more advanced version, BUT DON'T SELL IT, that uses 12V full-scale voltage
at the trim box potentiometer, the bar graph, an "In Transit" led, a "locked"
led and a setting knob.
--------
Eric M. Jones
www.PerihelionDesign.com
113 Brentwood Drive
Southbridge, MA 01550
(508) 764-2072
emjones(at)charter.net
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=407633#407633
Attachments:
http://forums.matronics.com//files/tscmr_installation_manual_416.pdf
http://forums.matronics.com//files/rac_trim_and_trim_indicator_schematics_433.pdf
Message 4
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Subject: | Re: New Electronic Device "Smart" Charging Source |
Mike Welch wrote:
> List members,
>
> snip... I'm already familiar with them and they make good stuff!
> The company is called PLX Devices, and they make incredible high quality products,
gages,
> etc, mostly for the auto industry.
> snip...
>
> Mike Welch
I can attest to the high quality, simple operation of the PLX's Air Fuel Ratio
Meter. Probably the simplest, no-brainer way to tune EFI. I installed a Simple
Digital Systems EFI on a Franklin 6 cylinder and set it up using the PLX device.
Amounted to putting a temporary O2 sensor in the 3 into 1 collector on one
cylinder bank and connecting to the PLX device (velcroed to my panel) and gauge.
Start the engine and your real-time air fuel ratio is displayed. Change the
mixture (fuel value) on the EFI and watch the gauge reflect the change. Set
it up for 12.5 to 1 max power at 250 RPM increments in the useable RPM range.
Took about 15 minutes to map the 5 point rpm fuel curve.
When I was done, I had the feeling that it couldn't be that simple.
It was.
The gauge is nice looking with it's digital display and progressive LED "needle",
but once the AFR is set there's no need for gauge so it can be removed.
I would bet the PLX battery charger is equally well designed and built.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=407640#407640
Message 5
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Subject: | Re: Cessna dual electronic stall/gear warning |
horn
>The current audio panel which will be replaced by the PMA8000 has
>no output to the speakers and the only thing driving the speakers is the
>stall and landing gear warning system.
Very good, then there is zero possibility for feedback.
>By the way this is what Mark Scheuer, the President of PS Engineering had to
>say about your proposal, " Wow what a great and thorough response from Bob,
>I see no reason why his system would not work, it appears you now have a
>solution!"
>
>Mark was the one who originally said he could not offer a solution to my
>problem, so I ran your idea by him to make sure there was not something that
>we were missing.
If Mark's happy with it, then I'll up the prediction
for probability of success to 99.9!
>Very nice of you to follow up with the warning.
>
>Years ago, I enjoyed your presentation at our EAA Chapter 65 in Stoney
>Creek, Ontario, Canada. I was impressed then and I'm even more impressed by
>you now. If your travels ever take you through Southern Ontario, please let
>me know. I'd love to treat you to a nice dinner and flight.
Dr. Dee and I enjoyed that trip very much. Wouldn't mind
doing another seminar in the future. I don't recall the
gentleman's name but that trip got me a ride in a nicely
done Falco. Flew over Niagara Falls and vicinity.
Let us know how this install works out for you.
Bob . . .
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