Today's Message Index:
----------------------
1. 04:41 AM - Re: Inspection camera (Harley)
2. 07:15 AM - Re: Spike catcher diode (Eric M. Jones)
3. 08:09 AM - Re: Spike catcher diode (Robert L. Nuckolls, III)
4. 08:20 AM - Re: Icom A-210 intercom (Robert L. Nuckolls, III)
5. 08:56 AM - Altitude Encoder Readout (LARRY SHARRATT)
6. 09:18 AM - Re: Spike catcher diode ()
7. 09:18 AM - Grounding question (Gilles.Thesee@ac-grenoble.fr)
8. 09:59 AM - Re: Spike catcher diode (Matt Prather)
9. 10:05 AM - Re: Altitude Encoder Readout (Ken)
10. 10:09 AM - Re: Altitude Encoder Readout (Matt Prather)
11. 12:54 PM - Re: Icom A-210 intercom (Ken)
12. 03:13 PM - Re: Spike catcher diode (Wade Roe)
Message 1
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Subject: | Re: Inspection camera |
>>About the closest it seemed to focus was ~4 inches...<<
I think I did mention that in one of the emails I sent. In response to
other concerns over the camera's diameter being too large to fit in a
spark plug hole, I also mentioned that there is a 9 mm camera and
extension available for the Ridgid unit, that might fit the HF one. I
believe that smaller camera version was listed as having a shorter focal
length.
So, if we can find out if the smaller, 9mm camera works with this unit,
we can kill two birds...fitting in small holes, and focal distance.
>>Were any planning on using this for any form of detailed
inspection,or just a "what's in there" look-see?<<
I originally got it so that I could find dropped washers, nuts, sockets,
etc. (done that many times!) inside the wing spar on my Long EZ, instead
of fishing around with a mirror in one hand, a flashlight in another,
and the grabbing device in my third...<G> I was happy to see that this
camera came with a magnet and a fishing hook.
Will also be handy for inspecting fuel tanks when I get the filler holes
cut, the hell hole, inside the cowling when attached, checking for
insects and chipmunk and mouse storage locations (I recently found a
whole walnut shoved into the wingtip light mounting hole on one
wing...probably a squirrel, but I didn't need the camera to see it). I
really wasn't concerned with viewing anything much closer than a few
inches.
Already used it at a friends house to locate some small parts that were
dropped behind her entertainment center. We used to have to move that
behemoth to retrieve anything! Also used it to see behind my desk here
(it's a huge oak desk that has the computer side mounted at a right
angle to the rest of the desk, so it fits in the corner against TWO
walls...almost impossible to move and difficult to see behind without
laying down on top of the desk..after taking the time to clear it off.
I feel I've received my money's worth already!
Harley
------------------------------------------------------------------------
ronburnett@charter.net wrote:
>
> In my hangar we fight mud dobbers and I will look through the wing inspection
holes and be able to tell them at 4" or greater. It'll be worth it for me for
just that use.
> Ron Burnett
> N1131B-8A Moscow Mills, MO
> --
>
>
> ---- Ron Quillin <rjquillin@gmail.com> wrote:
>
> ============
> Apologies; found more of the thread.
> Looks like others too are also finding close work not great.
>
> Any further opinions?
>
>
>> Huge long thread here and perhaps I missed some of the discussion...
>> HF had them on sale plus I had a 20% off coupon; had to bite.
>> Finally got around to playing with it.
>> Pretty cute, but...
>> The manual has no mention of focal distances.
>> For some reason I expected some form of adjustment; nada.
>> About the closest it seemed to focus was ~4 inches.
>> Tried to read some text and stamped serial numbers; nearly impossible.
>>
>> Were any planning on using this for any form of detailed inspection,
>> or just a "what's in there" look-see?
>>
>> As cute as it is, I'm finding it difficult to find an application
>> where any detail at all is required.
>> Others having different results?
>>
>> Ron Q.
>>
>
>
>
Message 2
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Subject: | Re: Spike catcher diode |
This issue has been argued here for years, so spare me your flames Bob.
Today, no electronic engineer recommends diodes for contactor coil suppression.
They are not the best, nor the second, nor the third, nor even fourth best way
to do the job.
Mechanical relays and contactors depend upon magnetism generated by an electric
current running through a wire coil. When the current stops, the magnetic field
collapses. But the relay does not know the difference between a wire coil moving
in a magnetic field (as in a generator) or a magnetic field moving in a
wire coil (as in a collapsing magnetic field). Thus a large voltage1000V to 1500V
typicallyis induced in the coil. This current goes the same direction the
original current didso it slows the contact openingallowing arcing, chatter, bouncing,
contact welding and even re-closure! Perihelion Design sells 18V 600W
Bi-Directional Zener Transient Voltage Suppressors P6KE18CA (for 14.5V systems)
that provide the most modern technical solution to relay coil suppression.
See my website or buy your own. The Gigavac GX11 contactor already has bidirectional
zeners for coil suppression. Gee, I wonder why!?
This issue has been argued here for years, so ignore me Bob.
"When I look up at the night sky and think about the billions of stars out there,
I think to myself: I'm amazing."
- Peter Serafinowicz
--------
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=252099#252099
Message 3
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Subject: | Spike catcher diode |
At 10:53 AM 7/7/2009, you wrote:
>On the stock Van=92s battery contactor, there is
>only three terminals (two 5 1/6 and one 3/16
>front and center). I am unsure where to install
>the IN5400 diode. Can anyone comment on proper
>placement? Also, what about the diode placement
>on the Van=92s stock starter contactor? Please
>excuse my very =93green=94 hands regarding electronics=85learning!
One of the battery contactor's large terminals
should be marked "BAT". The diode's banded end
connects to this terminal. The other end goes
to the 3/16" terminal.
This was the image of Van's starter contactor
from his website.
Emacs!
The right small terminal is marked "I" and
is not used. The left small terminal is power
from the starter push button on the panel.
The banded end of the diode connects to
this terminal also. The other end connects to
one of the contactor's mouning bolts
which is also airframe ground.
Bob . . .
---------------------------------------
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
---------------------------------------
Message 4
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Subject: | Re: Icom A-210 intercom |
At 01:41 PM 7/6/2009, you wrote:
>Kevin - funny you should mention that. Yesterday I was running the
>engine with the intercom turned on, for the first time. I couldn't
>adjust the VOX squelch enough to prevent it coming on, anywhere
>above 1,500 RPM. They don't seem to have enough range in the
>adjustment. Let me know if you hear anything from their Tech Support.
Keep in mind that adjustable VOX systems are WATCHING for
an increase in signal from the microphone which it ASSUMES
is YOU TALKING. Depending on microphone's signal to noise
radio (ability to cancel background noise), increases
in cabin noise will cause the VOX system to open up and
requires resetting the threshold level.
I've never encountered a microphone/intercom combination
that did not require readjustment for engine off versus
climb versus level flight conditions. If the microphone
noise canceling abilities are poor, then some VOX systems
will be unable to make the distinction between your voice
and other noises in the cabin. Cabin noise varies greatly
from one airplane to another.
I worked with a customer some years ago to add a
combination of active frequency filters and a software
driven threshold detector that could make a distinction
between syllabic voice signals and the relatively
constant characteristics of cabin noise. But even this
system could be undone if you didn't use a pretty good
noise cancelling microphone with it.
Bob . . .
---------------------------------------
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
---------------------------------------
Message 5
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Subject: | Altitude Encoder Readout |
Don't know if this is the proper forum for this, but here goes:
Some years ago, maybe 15 or so, there was an article in Sport Aviation regarding
a kit for a panel-mounted device which would give a constant display of what
the encoder was sending. Since then, I haven't heard of any such instrument,
except what's incorporated in the newer transponders. Does anyone on this forum
know of any such self-contained instrument that could be used with the older
transponders/encoders?
Thanks
Larry Sharratt
Message 6
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Subject: | Spike catcher diode |
Wade,
Which approach (Zeners, Diodes or nothing) you choose is up to you. On
my website link below you can see where I employed Van's "blue" starter
diode (I have an extra contactor 'cause it's IR) which uses the same
approach. As Bob indicated I snaked the other end around the contactor
to the mounting bolt. Van's little direction sheet is quite clear -
don't deviate from it. In my case the solenoids are mounted on carbon
fiber so I use a ground back to the FG. I haven't decided if I'm going
to use zeeners, diodes or just replace the solenoid on some scheduled
basis. I've yet to see anything from anyone which shows how much longer
(days, weeks or years) a solenoid lasts by adding these gadgets. The
problem is real, but actual life expectancy needs to be measured to
satisfy my interest. If you are the typical pilot which flies 35 hours /
year it will fail from sitting around before it fails from arching.
http://2.bp.blogspot.com/_hkAHk0Xu6wo/SdymLdP-KbI/AAAAAAAAA1A/rF4p8Xvi2U
U/s1600-h/IMG_1312.JPG
Glenn
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Wade
Roe
Sent: Tuesday, July 07, 2009 11:54 AM
Subject: RE: AeroElectric-List: Spike catcher diode
On the stock Van's battery contactor, there is only three terminals (two
5 1/6 and one 3/16 front and center). I am unsure where to install the
IN5400 diode. Can anyone comment on proper placement? Also, what about
the diode placement on the Van's stock starter contactor? Please excuse
my very "green" hands regarding electronics...learning!
Thanks!
Wade Roe
EAA 557
Aeronca 7AC flying
RV-7 nearing completion
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of
Robert L. Nuckolls, III
Sent: Friday, July 03, 2009 1:33 PM
Subject: Re: AeroElectric-List: Spike catcher diode
At 11:09 AM 7/3/2009, you wrote:
I have the stock Van's master and starter contactors. Does anyone know
if either of these items have internal diodes? Also, what size diode
should be used on the starter contactor assuming an external is needed?
I'm referencing AEC Z-13/8. Thanks!
The master certainly would not. The starter MIGHT
and would say so stamped on the under side of
the mounting flange. In any case, two suppressors
are better than no suppressors.
There are no rectifier diodes you can pick that
will be at-risk for electrical overload. My personal
favorites are the electrical over-kill (but
mechanically robust) 1N540x series. These
are really inexpensive and available from
Radio Shack and others . . .
http://aeroelectric.com/Pictures/Misc/RS_Diodes.jpg
The 1A, 1N400x series are electrically quite
adequate but more fragile.
Bob . . .
---------------------------------------
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
---------------------------------------
- The AeroElectric-List Email Forum -
--> http://www.matronics.com/Navigator?AeroElectric-List
- MATRONICS WEB FORUMS -
--> http://forums.matronics.com
- List Contribution Web Site -
Thank you for your generous support!
-Matt Dralle, List Admin.
--> http://www.matronics.com/contribution
Message 7
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Subject: | Grounding question |
Hi Bob and all,
A buddy asked for help in adapting the wiring of his factory built Rotax 912 S
aircraft.
He wishes something more similar to fig Z16
His battery, contactor, regulator and capacitor are under the seats, whereas the
ground bus is on the firewall.
The factory originally grounded the regulator and battery contactor direct at the
minus post of the battery.
Is it advisable to retain this configuration, or would it be better to ground those
at the ground bus on the firewall, and retain only one fat ground wire running
from the fwl to the minus pole of the battery.
Thanks in advance for your help,
Best regards,
Gilles
http://contrails.free.fr
Message 8
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Subject: | Spike catcher diode |
My thinking is that going without spike protection will cause the
controlling switch to have a shorter service life. The high voltage is
across the coil... ANY of the spike protection methods will provide the
controlling switch with a relatively easy life.
The question of WHICH protection method is about RELAY performance and
life. Then too I would expect many of the relays in the airplane to not
particularly care about which protection method is employed. Many of them
aren't switching very high current, at least not very often. The
alternator relay should last "forever" as it should rarely if ever be
asked to switch the alternator when it's making much current.
The starter relay is the one that regularly gets hit hard - switching
hundreds of amps in many aircraft each flight. Setting that relay up to
open and close as succinctly as possible should help its service life. I
would think electrically operated landing gear controlling relays would be
the next one in terms of severity of duty.
Regards,
Matt-
> Wade,
>
>
> Which approach (Zeners, Diodes or nothing) you choose is up to you. On
> my website link below you can see where I employed Van's "blue" starter
> diode (I have an extra contactor 'cause it's IR) which uses the same
> approach. As Bob indicated I snaked the other end around the contactor
> to the mounting bolt. Van's little direction sheet is quite clear -
> don't deviate from it. In my case the solenoids are mounted on carbon
> fiber so I use a ground back to the FG. I haven't decided if I'm going
> to use zeeners, diodes or just replace the solenoid on some scheduled
> basis. I've yet to see anything from anyone which shows how much longer
> (days, weeks or years) a solenoid lasts by adding these gadgets. The
> problem is real, but actual life expectancy needs to be measured to
> satisfy my interest. If you are the typical pilot which flies 35 hours /
> year it will fail from sitting around before it fails from arching.
>
>
> http://2.bp.blogspot.com/_hkAHk0Xu6wo/SdymLdP-KbI/AAAAAAAAA1A/rF4p8Xvi2U
> U/s1600-h/IMG_1312.JPG
>
>
> Glenn
>
>
> From: owner-aeroelectric-list-server@matronics.com
> [mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Wade
> Roe
> Sent: Tuesday, July 07, 2009 11:54 AM
> To: aeroelectric-list@matronics.com
> Subject: RE: AeroElectric-List: Spike catcher diode
>
>
> On the stock Van's battery contactor, there is only three terminals (two
> 5 1/6 and one 3/16 front and center). I am unsure where to install the
> IN5400 diode. Can anyone comment on proper placement? Also, what about
> the diode placement on the Van's stock starter contactor? Please excuse
> my very "green" hands regarding electronics...learning!
>
>
> Thanks!
>
>
> Wade Roe
>
>
> EAA 557
>
> Aeronca 7AC flying
>
> RV-7 nearing completion
>
>
> -----Original Message-----
> From: owner-aeroelectric-list-server@matronics.com
> [mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of
> Robert L. Nuckolls, III
> Sent: Friday, July 03, 2009 1:33 PM
> To: aeroelectric-list@matronics.com
> Subject: Re: AeroElectric-List: Spike catcher diode
>
>
> At 11:09 AM 7/3/2009, you wrote:
>
>
> I have the stock Van's master and starter contactors. Does anyone know
> if either of these items have internal diodes? Also, what size diode
> should be used on the starter contactor assuming an external is needed?
> I'm referencing AEC Z-13/8. Thanks!
>
>
> The master certainly would not. The starter MIGHT
> and would say so stamped on the under side of
> the mounting flange. In any case, two suppressors
> are better than no suppressors.
>
> There are no rectifier diodes you can pick that
> will be at-risk for electrical overload. My personal
> favorites are the electrical over-kill (but
> mechanically robust) 1N540x series. These
> are really inexpensive and available from
> Radio Shack and others . . .
>
> http://aeroelectric.com/Pictures/Misc/RS_Diodes.jpg
>
> The 1A, 1N400x series are electrically quite
> adequate but more fragile.
>
>
> Bob . . .
>
> ---------------------------------------
> ( . . . a long habit of not thinking )
> ( a thing wrong, gives it a superficial )
> ( appearance of being right . . . )
> ( )
> ( -Thomas Paine 1776- )
> ---------------------------------------
>
>
> - The AeroElectric-List Email Forum -
> --> http://www.matronics.com/Navigator?AeroElectric-List
>
> - MATRONICS WEB FORUMS -
> --> http://forums.matronics.com
>
> - List Contribution Web Site -
> Thank you for your generous support!
> -Matt Dralle, List Admin.
> --> http://www.matronics.com/contribution
>
>
Message 9
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Subject: | Re: Altitude Encoder Readout |
Any chance you need an excuse to acquire an MRX traffic detector ;)
The MRX will display transponder code and the altitude you are
transmitting but it's around $500. A MRX plus a new bottom end
transponder made more sense to me than spending the same or more for a
more expensive transponder though. There are enough units around that
you could likely borrow one if the need is short term.
Ken
LARRY SHARRATT wrote:
> Don't know if this is the proper forum for this, but here goes:
> Some years ago, maybe 15 or so, there was an article in Sport Aviation
> regarding a kit for a panel-mounted device which would give a constant
> display of what the encoder was sending. Since then, I haven't heard of
> any such instrument, except what's incorporated in the newer
> transponders. Does anyone on this forum know of any such self-contained
> instrument that could be used with the older transponders/encoders?
>
> Thanks
>
> Larry Sharratt
>
Message 10
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Subject: | Re: Altitude Encoder Readout |
I believe the article in question starts on page 66 of the Feb 1992 issue
of Sport Aviation.. I don't know if the plans/kits are still available.
If you are an EAA member, the article can be downloaded from the Sport
Aviation website.
Regards,
Matt-
> Don't know if this is the proper forum for this, but here goes:
> Some years ago, maybe 15 or so, there was an article in Sport Aviation
> regarding a kit for a panel-mounted device which would give a constant
> display of what the encoder was sending. Since then, I haven't heard of
> any such instrument, except what's incorporated in the newer transponders.
> Does anyone on this forum know of any such self-contained instrument that
> could be used with the older transponders/encoders?
>
> Thanks
>
> Larry Sharratt
>
Message 11
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Subject: | Re: Icom A-210 intercom |
This seems to have been solved in the Flighttech intercom although in a
different manner. I believe he uses a telephone noise cancelling chip on
the mic. Anyway I find that it works perfectly for me with no detectable
background noise on the ground or in the air, and no delays or clipped
speech. Unlike VOX systems, no cabin noise comes through when talking
either!
It does not affect my VHF icom A200 transmissions as those don't route
through the intercom chip.
Ken
>
> I worked with a customer some years ago to add a
> combination of active frequency filters and a software
> driven threshold detector that could make a distinction
> between syllabic voice signals and the relatively
> constant characteristics of cabin noise. But even this
> system could be undone if you didn't use a pretty good
> noise cancelling microphone with it.
>
>
> Bob . . .
>
Message 12
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Subject: | Spike catcher diode |
Thanks for everyone's comments.
Wade Roe
-----Original Message----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of
Robert L. Nuckolls, III
Sent: Wednesday, July 08, 2009 10:07 AM
Subject: RE: AeroElectric-List: Spike catcher diode
At 10:53 AM 7/7/2009, you wrote:
On the stock Van's battery contactor, there is only three terminals (two
5 1/6 and one 3/16 front and center). I am unsure where to install the
IN5400 diode. Can anyone comment on proper placement? Also, what about
the diode placement on the Van's stock starter contactor? Please excuse
my very "green" hands regarding electronics.learning!
One of the battery contactor's large terminals
should be marked "BAT". The diode's banded end
connects to this terminal. The other end goes
to the 3/16" terminal.
This was the image of Van's starter contactor
from his website.
Emacs!
The right small terminal is marked "I" and
is not used. The left small terminal is power
from the starter push button on the panel.
The banded end of the diode connects to
this terminal also. The other end connects to
one of the contactor's mouning bolts
which is also airframe ground.
Bob . . .
---------------------------------------
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
---------------------------------------
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