Today's Message Index:
----------------------
1. 01:06 AM - Re: Noise Cancelling headphones (danb)
2. 06:16 AM - Re: Re: Noise Cancelling headphones (Kelly McMullen)
3. 07:15 AM - Re: For sale (DeWitt Whittington)
4. 07:33 AM - Re: Re: Noise Cancelling headphones (Vern Little)
5. 07:55 AM - Re: Re: Noise Cancelling headphones (danielj.billingsley@yahoo.com)
6. 08:21 AM - Re: Re: Noise Cancelling headphones (rv7a.builder)
7. 09:47 AM - Re: For sale (Larry Mac Donald)
8. 11:34 AM - Re: For sale (Michael Orth)
9. 01:05 PM - Re: For sale (Larry Mac Donald)
10. 08:08 PM - UN-FUSED MAIN BUS FEEDER (user9253)
11. 09:30 PM - Re: UN-FUSED MAIN BUS FEEDER (Robert L. Nuckolls, III)
12. 09:46 PM - Re: UN-FUSED MAIN BUS FEEDER (Jeff Luckey)
Message 1
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| Subject: | Re: Noise Cancelling headphones |
John,
I recently bought a set of Bose headsets and had a similar thing happen. Oddly
enough, I was able to hit the PTT and talk to ground fine, however, when i went
to tower and hit the PTT I got a loud squeal. Strange how a different frequency
on the radio induces the noise. Anyone have a thought? use a filter?
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=436876#436876
Message 2
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| Subject: | Re: Noise Cancelling headphones |
I had that problem with a previous plane, where radio mostly worked fine
with lower frequencies, but would squeal with frequencies above say
125.0. Once I put my radio in another aircraft that didn't have
problems, it was obvious the problem existed in my airplane outside of
the radio. Turned out to be the antenna cable, which was made in the
days before crimped connectors were common. On the radio end of the
cable there was a cold solder joint on the shield, allowing RF to
feedback into the radio. I was given all kinds of theories in trouble
shooting, of problems in the radio, problems with the brand headset not
having shielded wires, etc. etc.
New cable completely eliminated the problem.
So I suggest trying a different PTT, try your radio in a different
airframe that has same model radio, see if the problem follows the
components or not.
On 1/12/2015 2:05 AM, danb wrote:
>
> John,
> I recently bought a set of Bose headsets and had a similar thing happen. Oddly
enough, I was able to hit the PTT and talk to ground fine, however, when i went
to tower and hit the PTT I got a loud squeal. Strange how a different frequency
on the radio induces the noise. Anyone have a thought? use a filter?
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=436876#436876
>
>
Message 3
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Hello Larry,
I sent in a bid for a number of items, but never heard from you. I assume
you easily sold them all?
Dee
DeWitt (Dee) Whittington
Richmond, VA
804-677-4849 iPhone
804-358-4333 Home
On Mon, Dec 8, 2014 at 3:05 PM, Larry Mac Donald <lm4@juno.com> wrote:
>
> I am offering the following aviation tools for sale.
> If you are interested, make a reasonable offer.
>
> Whitney hand punch
> Tubing cutter
> Hole flanging tool
> Seaming tool
> Fly-cutter
> Micro stop countersink
> Aviation snips-left-right & straight
> 3X rivet gun
> Safety wire twister
> Magnetic base protractor
> Rivet spacer
> Air grinder
> Pop rivet tool
> Rivet gauges
> Cleco pliers
> Deburring tool
> Countersink
> Fluting plier
> Bucking bar
> Rivet squeezer with 1-1/2 yoke
> 3 In. yoke
> Pneumatic Rivet squeezer with 1-1/2 in. yoke
> Rivet squeezer dies
> Dimpleing dies
> Blind rivet kit
> Air drill
> Clecos
> Hand seamer
>
>
> ____________________________________________________________
> NetZero now offers 4G mobile broadband. Sign up now.
> http://www.netzero.net/?refcd=NZINTISP0512T4GOUT1
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| Subject: | Re: Noise Cancelling headphones |
Try also taking your headset cord and wrap three turns of it around your han
d and secure it with a pair of tie wraps. You've just made an RF choke that
may eliminate conduct RF energy into the headset.
Vern
=====
Vernon R. Little | Chairman, Iris Dynamics Ltd. | President, Vx Aviation
> On Jan 12, 2015, at 6:15 AM, Kelly McMullen <kellym@aviating.com> wrote:
>
om>
>
> I had that problem with a previous plane, where radio mostly worked fine w
ith lower frequencies, but would squeal with frequencies above say 125.0. On
ce I put my radio in another aircraft that didn't have problems, it was obvi
ous the problem existed in my airplane outside of the radio. Turned out to b
e the antenna cable, which was made in the days before crimped connectors we
re common. On the radio end of the cable there was a cold solder joint on th
e shield, allowing RF to feedback into the radio. I was given all kinds of t
heories in trouble shooting, of problems in the radio, problems with the bra
nd headset not having shielded wires, etc. etc.
> New cable completely eliminated the problem.
> So I suggest trying a different PTT, try your radio in a different airfram
e that has same model radio, see if the problem follows the components or no
t.
>> On 1/12/2015 2:05 AM, danb wrote:
>>
>> John,
>> I recently bought a set of Bose headsets and had a similar thing happen. O
ddly enough, I was able to hit the PTT and talk to ground fine, however, whe
n i went to tower and hit the PTT I got a loud squeal. Strange how a differe
nt frequency on the radio induces the noise. Anyone have a thought? use a fi
lter?
>>
>>
>>
>>
>> Read this topic online here:
>>
>> http://forums.matronics.com/viewtopic.php?p=436876#436876
>
>
==========================
=========
==========================
=========
==========================
=========
==========================
=========
>
>
>
Message 5
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| Subject: | Re: Noise Cancelling headphones |
Thanks Kelly, that's good =C2-information and gives me something to look
at.Dan
From: Kelly McMullen <kellym@aviating.com>
To: aeroelectric-list@matronics.com
Sent: Monday, January 12, 2015 7:15 AM
Subject: Re: AeroElectric-List: Re: Noise Cancelling headphones
m
I had that problem with a previous plane, where radio mostly worked fine
with lower frequencies, but would squeal with frequencies above say
125.0. Once I put my radio in another aircraft that didn't have
problems, it was obvious the problem existed in my airplane outside of
the radio. Turned out to be the antenna cable, which was made in the
days before crimped connectors were common. On the radio end of the
cable there was a cold solder joint on the shield, allowing RF to
feedback into the radio. I was given all kinds of theories in trouble
shooting, of problems in the radio, problems with the brand headset not
having shielded wires, etc. etc.
New cable completely eliminated the problem.
So I suggest trying a different PTT, try your radio in a different
airframe that has same model radio, see if the problem follows the
components or not.
On 1/12/2015 2:05 AM, danb wrote:
>
> John,
> I recently bought a set of Bose headsets and had a similar thing happen.
Oddly enough, I was able to hit the PTT and talk to ground fine, however, w
hen i went to tower and hit the PTT I got a loud squeal. Strange how a diff
erent frequency on the radio induces the noise. Anyone have a thought? use
a filter?
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=436876#436876
>
>
=C2- =C2- =C2- =C2- =C2- -Matt Dralle, List Admin.
-
S -
Message 6
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| Subject: | Re: Noise Cancelling headphones |
My headsets are plugged into the bulkhead right behind the baggage area in
my RV-7A. The thought was to keep the cords out of the way. When I bought t
he nose canceling headsets it became difficult to reach the headset control
ler(volume, Bluetooth, on/off) so I bought a 5ft extension from Aircraft Sp
ruce and I no longer have any squealing? Go Figure? This 5ft extension also
allows me to easily unplug my headset if I have to use my handheld as a ba
ckup. Previously I would have to=C2-yank the cord from the back bulkhead
which I am sure is not a good idea. Thank you guys for all of your input. J
ohn=C2-
On Monday, January 12, 2015 7:32 AM, Vern Little <voltar@vx-aviation.c
om> wrote:
Try also taking your headset cord and wrap three turns of it around your h
and and secure it with a pair of tie wraps. =C2-You've just made an RF ch
oke that may eliminate conduct RF energy into the headset.
Vern
======Vernon R. Little | Chairman, Iris Dynamics Ltd. | Preside
nt, Vx Aviation
On Jan 12, 2015, at 6:15 AM, Kelly McMullen <kellym@aviating.com> wrote:
m>
I had that problem with a previous plane, where radio mostly worked fine wi
th lower frequencies, but would squeal with frequencies above say 125.0. On
ce I put my radio in another aircraft that didn't have problems, it was obv
ious the problem existed in my airplane outside of the radio. Turned out to
be the antenna cable, which was made in the days before crimped connectors
were common. On the radio end of the cable there was a cold solder joint o
n the shield, allowing RF to feedback into the radio. I was given all kinds
of theories in trouble shooting, of problems in the radio, problems with t
he brand headset not having shielded wires, etc. etc.
New cable completely eliminated the problem.
So I suggest trying a different PTT, try your radio in a different airframe
that has same model radio, see if the problem follows the components or no
t.
On 1/12/2015 2:05 AM, danb wrote:
John,
I recently bought a set of Bose headsets and had a similar thing happen. Od
dly enough, I was able to hit the PTT and talk to ground fine, however, whe
n i went to tower and hit the PTT I got a loud squeal. Strange how a differ
ent frequency on the radio induces the noise. Anyone have a thought? use a
filter?
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=436876#436876
www.aeroelectric.cre www.buildersbooks.comnbsp;=C2-=C2-* My Pilot Stor
e wwonsulting www.mrrace.com
http://www.matronics.com/contribution http://www.matronics.com/Navigator?A
eroElectric-List
= =C2-=C2-=C2-=C2-=C2-=C2-=C2-=C2-=C2-=C2-=C2-=C2
-&nb =C2-=C2---> http://forums.ma============
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Message 7
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Dee, Sorry things didn't work out quite that way.
First of all i did not receive your bid. Second, that was between
december 10th and 15th. and i was starting to feel out of breath
around that time. By the 20th i had to check into a Hospital and
spent Christmas week there. i was released Christmas eve and
have been weak and sleepy ever since. Others have inquired
and have asked for photos and i will have to accommodate them
as soon as I get the strength to clean and photograph the items.
That's where i stand now. When i can get these things done i will
get back to you. i'm sorry for the delay.
Larry
12, 2015, at 10:13 AM, DeWitt Whittington wrote:
> Hello Larry,
>
> I sent in a bid for a number of items, but never heard from you. I ass
ume you easily sold them all?
>
> Dee
>
> DeWitt (Dee) Whittington
> Richmond, VA
> 804-677-4849 iPhone
> 804-358-4333 Home
>
>
> On Mon, Dec 8, 2014 at 3:05 PM, Larry Mac Donald <lm4@juno.com> wrote:
m>
>
> I am offering the following aviation tools for sale.
> If you are interested, make a reasonable offer.
>
> Whitney hand punch
> Tubing cutter
> Hole flanging tool
> Seaming tool
> Fly-cutter
> Micro stop countersink
> Aviation snips-left-right & straight
> 3X rivet gun
> Safety wire twister
> Magnetic base protractor
> Rivet spacer
> Air grinder
> Pop rivet tool
> Rivet gauges
> Cleco pliers
> Deburring tool
> Countersink
> Fluting plier
> Bucking bar
> Rivet squeezer with 1-1/2 yoke
> 3 In. yoke
> Pneumatic Rivet squeezer with 1-1/2 in. yoke
> Rivet squeezer dies
> Dimpleing dies
> Blind rivet kit
> Air drill
> Clecos
> Hand seamer
>
>
>
> ____________________________________________________________
> NetZero now offers 4G mobile broadband. Sign up now.
> http://www.netzero.net/?refcd=NZINTISP0512T4GOUT1
>
> ==========
> br> fts!)
> r> > com" target="_blank">www.aeroelectric.com
> w.buildersbooks.com" target="_blank">www.buildersbooks.com
> p.com" target="_blank">www.homebuilthelp.com
> e.com" target="_blank">www.mypilotstore.com
> " target="_blank">www.mrrace.com
> target="_blank">http://www.matronics.com/contribution
> -Matt Dralle, List Admin.
> ==========
> -
> Electric-List" target="_blank">http://www.matronics.com/Navigator?Ae
roElectric-List
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> _blank">http://forums.matronics.com
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____________________________________________________________
The #1 Worst Carb Ever?
Click to Learn #1 Carb that Kills Your Blood Sugar (Don't Eat Th
is!)
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Message 8
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>(I) was starting to feel out of breath around that time
Larry,
Pulmonary embolism?
Michael
-------------------------------------------------------------------------
-------
-------------------------------------------------------------------------
-------
----- Original Message -----
From: Larry Mac Donald
To: aeroelectric-list@matronics.com
Sent: Monday, January 12, 2015 9:45 AM
Subject: Re: AeroElectric-List: For sale
Dee, Sorry things didn't work out quite that way.
First of all i did not receive your bid. Second, that was between
december 10th and 15th. and i was starting to feel out of breath
around that time. By the 20th i had to check into a Hospital and
spent Christmas week there. i was released Christmas eve and
have been weak and sleepy ever since. Others have inquired
and have asked for photos and i will have to accommodate them
as soon as I get the strength to clean and photograph the items.
That's where i stand now. When i can get these things done i will
get back to you. i'm sorry for the delay.
Larry
12, 2015, at 10:13 AM, DeWitt Whittington wrote:
Hello Larry,
I sent in a bid for a number of items, but never heard from you. I
assume you easily sold them all?
Dee
DeWitt (Dee) Whittington
Richmond, VA
804-677-4849 iPhone
804-358-4333 Home
On Mon, Dec 8, 2014 at 3:05 PM, Larry Mac Donald <lm4@juno.com>
wrote:
<lm4@juno.com>
I am offering the following aviation tools for sale.
If you are interested, make a reasonable offer.
Whitney hand punch
Tubing cutter
Hole flanging tool
Seaming tool
Fly-cutter
Micro stop countersink
Aviation snips-left-right & straight
3X rivet gun
Safety wire twister
Magnetic base protractor
Rivet spacer
Air grinder
Pop rivet tool
Rivet gauges
Cleco pliers
Deburring tool
Countersink
Fluting plier
Bucking bar
Rivet squeezer with 1-1/2 yoke
3 In. yoke
Pneumatic Rivet squeezer with 1-1/2 in. yoke
Rivet squeezer dies
Dimpleing dies
Blind rivet kit
Air drill
Clecos
Hand seamer
____________________________________________________________
NetZero now offers 4G mobile broadband. Sign up now.
http://www.netzero.net/?refcd=NZINTISP0512T4GOUT1
==========
br> fts!)
r> > com" target="_blank">www.aeroelectric.com
w.buildersbooks.com" target="_blank">www.buildersbooks.com
p.com" target="_blank">www.homebuilthelp.com
e.com" target="_blank">www.mypilotstore.com
" target="_blank">www.mrrace.com
target="_blank">http://www.matronics.com/contribution
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Electric-List"
target="_blank">http://www.matronics.com/Navigator?AeroElectric-List
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href="http://www.aeroelectric.com/">www.aeroelectric.com
href="http://www.buildersbooks.com/">www.buildersbooks.com
href="http://www.homebuilthelp.com/">www.homebuilthelp.com
href="http://www.mypilotstore.com/">www.mypilotstore.com
href="http://www.mrrace.com/">www.mrrace.com
href="http://www.matronics.com/contribution">http://www.matronics.com/c
ontribution
href="http://www.matronics.com/Navigator?AeroElectric-List">http://www.
matronics.com/Navigator?AeroElectric-List
href="http://forums.matronics.com/">http://forums.matronics.com
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No virus found in this message.
Checked by AVG - www.avg.com
01/12/15
Message 9
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C.O.P.D. plus a cold in the lower throat plus a cold in
the upper throat plus all my sinuses infected.
Larry
On Jan 12, 2015, at 2:32 PM, Michael Orth wrote:
> >(I) was starting to feel out of breath around that time
>
> Larry,
> Pulmonary embolism?
> Michael
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NetZero now offers 4G mobile broadband. Sign up now.
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| Subject: | UN-FUSED MAIN BUS FEEDER |
It is common practice not to fuse the main bus feeder between the battery and the main power bus. But what about aircraft with small electrical loads and small feeders? For example, the RV-12 typically uses 10 to 15 amps total. The main feeder is 12 awg per the factory plans. This thread, http://www.vansairforce.com/community/showthread.php?t=120999
is about a fire (while on the ground) that was caused by the main feeder shorting
out to the choke cable. Do we need to rethink the practice of not fusing the
main power feeder? Or are good wiring practices safe enough?
Joe
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=436938#436938
Message 11
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| Subject: | Re: UN-FUSED MAIN BUS FEEDER |
At 22:07 2015-01-12, you wrote:
>
>It is common practice not to fuse the main bus feeder between the
>battery and the main power bus. But what about aircraft with small
>electrical loads and small feeders? For example, the RV-12
>typically uses 10 to 15 amps total. The main feeder is 12 awg per
>the factory plans. This thread,
>http://www.vansairforce.com/community/showthread.php?t=120999
>is about a fire (while on the ground) that was caused by the main
>feeder shorting out to the choke cable. Do we need to rethink the
>practice of not fusing the main power feeder? Or are good wiring
>practices safe enough?
>Joe
The FARS speak to the risks for ENGINE CRANKING
feeders where bus feeders are on the same order
of risk as the cranking circuits.
Airplanes that are powered with 'tiny' alternators
tend to have bus feeders to match and are
at greater risk from battery-fed faults. The
thread is extensive and riddled with unclear
and/or erroneous words. I'll need to digest
it a bit . . .
The short answer is that some form of transient
tolerant fault protection wouldn't hurt but better
installation of the potentially vulnerable wire
would be better. So yes, good wiring practices
are the first line of defense against such events.
The fact that this wire became mechanically
compromised speaks to questionable shop practice.
I'll sift through the narrative and report back.
Watch this space.
Bob . . .
Message 12
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| Subject: | Re: UN-FUSED MAIN BUS FEEDER |
Joe,
Thanks for bringing this to our attention. Very scary and very interesting. A
poster on the VansAirforce forum states that the RV-12 is "certified" under an
ASTM standard.
I found this:
ASTM F2245 - 14. Standard Specification for Design and Performance of a Light Sport Airplane. http://www.astm.org/Standards/F2245.htm
The abstract for that document suggests that it discusses electrical systems.
I would like to get a look at that document but I'm hesitant to spend $60 just
for a look-see.
Does anyone have a copy of that document that I could look at? Has anyone on this
forum seen/read that document and would care to comment on it.
Back to the VansAirforce post - The original poster did not post any pictures of
the before & after. That's a shame because it might be very instructive if
we could see how that feeder was routed.
-Jeff
PS - As long-time members of this forum may recall, I have been a proponent of
protecting all feeders and my designs incorporate such protection. This current
(no pun intended) issue is a good example of why. If this fire had occurred
while airborne the results could have been catastrophic.
On Monday, January 12, 2015 8:24 PM, user9253 <fransew@gmail.com> wrote:
It is common practice not to fuse the main bus feeder between the battery and the main power bus. But what about aircraft with small electrical loads and small feeders? For example, the RV-12 typically uses 10 to 15 amps total. The main feeder is 12 awg per the factory plans. This thread, http://www.vansairforce.com/community/showthread.php?t=120999
is about a fire (while on the ground) that was caused by the main feeder shorting
out to the choke cable. Do we need to rethink the practice of not fusing the
main power feeder? Or are good wiring practices safe enough?
Joe
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=436938#436938
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