Today's Message Index:
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1. 01:40 PM - Re: Trio Avionics ProPilot 130 Mhz interference problem (was noise problem on radio) (Sacha)
2. 05:42 PM - Re: Through-Hole Wire Metal (Robert L. Nuckolls, III)
3. 05:46 PM - Re: testing a coax lead (Robert L. Nuckolls, III)
4. 08:11 PM - circuit protection on contactors (Dj Merrill)
5. 11:08 PM - Re: circuit protection on contactors (Sprocket)
Message 1
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Subject: | Trio Avionics ProPilot 130 Mhz interference problem |
(was noise problem on radio)
>Glad to hear you solved your problem, Sacha.
Thank you.
> On the other hand, my first contact with Trio
> suggests that they've treated DO-160 as a 'requirement'.
> Given that they do not sell into the TC aircraft
> market, they seem to think DO-160 is not applicable/
> useful to their design efforts.
> I'll see if I can help them deduce the
> feature of their product that lets the interfering
> energy get outside their box . . . and hopefully
> there is a relatively painless solution. We'll
> see. It would be useful for them -AND- their
> customers to understand that DO-160 guidelines
> are recipes for blissful living in the
> community of airplane owners no matter where
> the airplane was built.
Bob, I have met the folks at Trio personally and believe that they would
appreciate your help. In fact they are the people who first pointed me to
the AeroElectric list. I'll forward this conversation to them to see if
they have any interest.
Sacha
Message 2
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Subject: | Re: Through-Hole Wire Metal |
At 08:06 PM 5/28/2014, you wrote:
>
>Some resistors and capacitors have tinned copper leads and some have
>steel leads. Does it matter? It seems to me that copper is better
>because it does not rust. What do you think?
All components crafted for use in
electronic assemblies have a finish
on leads that is conducive to soldering.
The actual material is seldom an issue
as long as they solder well.
Bob . . .
Message 3
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Subject: | Re: testing a coax lead |
At 11:18 PM 5/28/2014, you wrote:
>Hi folks,
>
>I am about to fly my RV 8 for the first time. Finished construction
>and am now tracking down glitches. I had a guy out to certify my
>pitot, static and transponder today. Pretty funny sequence. First,
>we couldn't get altitude data to the transponder. Turns out that
>you have to turn on the serial data feed in a GRT EFIS. Next,
>turned out the feed pin on was sub-D connector into the transponder
>was in the wrong spot. Finally got a read-out on the
>altitude. Last problem, the transponder signal was really weak.
>
>We disconnected the antenna and plugged the transponder directly
>into his tester. The unit, a Garmin 327, was working fine. That
>leaves the antenna and leads.
>
>I used a right angle adaptor as described in the comic book. One
>from the transponder and one into the antenna. Seems highly
>unlikely that there is a break in the cable itself. More likely,
>one of the connectors or the right angle adaptors is at fault.. Any
>good ideas about how to test this? I don't want to have the
>certification technician come out again until I am sure I have
>solved the problem. I also don't want to tear out the entire cable
>and start over--really inconvenient at this juncture. I didn't
>leave enough slack to cut off the connecters and start over so
>really, I just need to diagnose the location of the fault and repair it.
>
>Two questions: how to track down the fault; how to test the line
>and/or antenna to make sure it is functioning properly prior to
>calling out the technician again.
Unfortunately, doing SWR checks on antennas
at this frequency is beyond the range of most
pieces of amateur radio equipment.
Do an ohmmeter check from center pin to
center pin . . . from connector body
to connector body . . . I've never experienced
any problems the po' boy's right angle
connector . . . but simply replacing the
DIY with an on-purpose connector wouldn't
hurt. Do you have a RG-400 connector crimp
tool?
I can send you a connector.
Bob . . .
Message 4
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Subject: | circuit protection on contactors |
We generally put some form of circuit protection (fuse, breaker, etc) on
most of our circuits, including the circuit to activate the starter
contactor, but we usually do not put any type of protection on the
circuit to activate the master contactor or E-bus contactor.
I am curious, why is this?
Thanks,
-Dj, in the middle of re-wiring for a panel upgrade
--
Dj Merrill - N1JOV - VP EAA Chapter 87
Sportsman 2+2 Builder #7118 N421DJ - http://deej.net/sportsman/
Glastar Flyer N866RH - http://deej.net/glastar/
Message 5
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Subject: | Re: circuit protection on contactors |
The practice is to protect against wires shorting to ground. The circuit protection
trips due to large fault current.
The master or e-bus contactor control wires operate by grounding the conductor
with a switch. The current in this circuit is limited by the resistance of the
contactor coil, so it needs no protection. A short on this wire may cause undesirable
behaviour, but it won't melt or catch fire.
Vern
===================================================
Sent from my iThing. It is responsible for all gramma and typo terrors.
> On May 29, 2014, at 8:09 PM, Dj Merrill <deej@deej.net> wrote:
>
>
> We generally put some form of circuit protection (fuse, breaker, etc) on most
of our circuits, including the circuit to activate the starter contactor, but
we usually do not put any type of protection on the circuit to activate the master
contactor or E-bus contactor.
>
> I am curious, why is this?
>
> Thanks,
>
> -Dj, in the middle of re-wiring for a panel upgrade
>
> --
> Dj Merrill - N1JOV - VP EAA Chapter 87
> Sportsman 2+2 Builder #7118 N421DJ - http://deej.net/sportsman/
> Glastar Flyer N866RH - http://deej.net/glastar/
>
>
>
>
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