Today's Message Index:
----------------------
1. 05:54 AM - Re: Insulation displacement connectors???? (Charlie England)
2. 06:10 AM - Re: Insulation displacement connectors???? (Charlie England)
3. 07:48 AM - Re: Insulation displacement connectors???? (Bill Putney)
4. 08:00 AM - Re: Insulation displacement connectors???? (Robert L. Nuckolls, III)
5. 08:08 AM - Re: Insulation displacement connectors???? (Robert L. Nuckolls, III)
6. 08:48 AM - Re: Insulation displacement connectors???? (Eric Page)
7. 08:58 AM - Radio Buzz (Ross Home)
8. 10:58 AM - Re: Insulation displacement connectors???? (Charlie England)
9. 12:01 PM - Re: Insulation displacement connectors???? (David Josephson)
10. 12:02 PM - Re: Insulation displacement connectors???? (David Josephson)
11. 03:20 PM - Re: Radio Buzz (Ross Home)
12. 03:55 PM - Re: Radio Buzz (user9253)
13. 04:43 PM - Re: Re: Radio Buzz (n1deltawhiskey@comcast.net)
14. 05:17 PM - Re: Re: Radio Buzz ()
15. 05:39 PM - Re: Re: Radio Buzz ()
16. 06:21 PM - Re: Re: Radio Buzz (Dj Merrill)
17. 08:44 PM - Double Trouble (Bill Bradburry)
18. 10:19 PM - Re: Re: Radio Buzz (Kelly McMullen)
19. 11:20 PM - Re: Double Trouble (Graeme Hart)
Message 1
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Subject: | Re: Insulation displacement connectors???? |
Outlawed in the '70s? Maybe so on that particular connector, but I've
watched AT&T techs use
http://www.specialized.net/Specialized/3M-Scotchlok-IDC-UR2-Connectors-1926-AWG-100Pk-4051.aspx
as recently as a few weeks ago.
I appreciate the 'be safe' sentiment, but 'bet your life' on the signal
wires in an intercom? Isn't that a bit of a knee-jerk reaction to anything
unfamiliar? If I'm not mistaken, this list came out of the desire to find
products and techniques that are *not* 'in common aeronautical use', so we
can improve on the products and/or techniques. We wouldn't have composite
airframes (or even aluminum ones) if someone hadn't been the 1st to use
something that was not 'in common aeronautical use'.
It would be more helpful to me if you could say something at least
marginally quantified, like, 'That terminal fails in 0.05% of connections,
vs a 0.00004% failure rate for PIDG terminals'.
Thanks,
Charlie
On Wed, Jul 15, 2015 at 5:57 PM, Bill Putney <billp@wwpc.com> wrote:
> Charlie,
>
> I know splicers use to love these things but even the telco's outlawed
> these in the 70's (i think). I'm surprised you can even find them on eBay.
>
> I guess you can use whatever you want to bet your life on in experimental
> but I'd stick with what's in common aeronautical use.
>
> Bill
>
> On 7/15/15 3:12 PM, Charlie England wrote:
>
> Anyone know if any type of insulation displacement crimp connectors have
> ever been used in aircraft applications? I used hundreds (thousands?) of
> EA-7759 Plain B Wire Connectors, similar to
> http://www.ebay.com/itm/371364009928?rmvSB=true
>
> in burglar alarm & other data cable installations, & never have had a
> failed connection in 3 decades (though admittedly, I was stripping &
> twisting the wires prior to crimping). For those who haven't seen these,
> they have 'teeth' inside that pierce the insulation when crimped.
>
> I'm looking at the need to 'daisy chain' several signal grounds from a
> single dSub pin (in this case, an intercom), and these tiny connectors
> really look attractive to stagger the joints over several inches of wire
> near the pin. I tested one by opening the closed end with a pair of pliers,
> running the 'trunk' wire through the connector, inserting the 'branch'
> wire, and crimping (no wire stripping involved). Seems to work fine in
> penetrating the tefzel insulation, and I can't budge the wires with a
> manual tug test.
>
> I have no desire to do this for high current applications, but for
> signal wires, it sure makes an attractive package due to it's small size.
> Not sure about the type of insulation, but I'm pretty sure it won't
> spontaneously combust & drag the plane out of the sky.
>
> Thoughts?
>
> Charlie
>
>
> *
>
>
> *
>
>
Message 2
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Subject: | Re: Insulation displacement connectors???? |
On Wed, Jul 15, 2015 at 8:25 PM, Robert L. Nuckolls, III <
nuckolls.bob@aeroelectric.com> wrote:
> At 05:12 PM 7/15/2015, you wrote:
>
> Anyone know if any type of insulation displacement crimp connectors have
> ever been used in aircraft applications? I used hundreds (thousands?) of
> EA-7759 Plain B Wire Connectors, similar to=C3=82
> http://www.ebay.com/itm/371364009928?rmvSB=true
>
> in burglar alarm & other data cable installations, & never have had a
> failed connection in 3 decades (though admittedly, I was stripping &
> twisting the wires prior to crimping). For those who haven't seen these,
> they have 'teeth' inside that pierce the insulation when crimped
>
>
> Suggest you use bussed d-sub connectors
>
> http://tinyurl.com/nzm3e2f
>
> I've got some bussing boards available if
> you want them.
>
>
> Bob . . .
>
>
Thanks, Bob; I've already got one of those dSub avionics GND busses mounted
in the plane. My specific application for those crimps is the signal ground
terminal in a DRE intercom (it has two ground pins in the 25pin dSub which
are electrically common internally). My intent was to run one of the gnd
pins to the avionics GND bus and the other to the gnd terminals of the
various inputs/outputs (mic, headset, music, etc) to the intercom. The
crimps would have been used to bring the various signal ground wires to
within the 1st few inches of dSub connector on the DRE.
Would it work as well to just take all those signal grounds to the avionics
dSub ground bus? I was trying to take the signal grounds directly to the
intercom to keep ground loop possibilities to an absolute minimum, and an
additional dSub bus for just 3 or 4 wires seems to be overkill (and bulky).
Thanks,
Charlie
Message 3
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Subject: | Re: Insulation displacement connectors???? |
I know a lot of guys have the old beans squirreled away but they tend to
make noisy connections and are corrosion prone. The Scotchloks are what
the telco's moved to after they outlawed the beans.
I take things about my airplane very seriously. If nothing else I use
the "How stupid would I feel" rule. Like how stupid would I feel if my
intercom quit on short final to a busy towered airport in marginal
weather because I didn't take the time to strip the wires and use the
right connectors?
It's a human factors thing. People can handle about 3 things going wrong
before they completely unravel. If the weather suddenly gets bad you can
turn around and go the other way, add strong winds in that reverse
direction now depleting your fuel faster than you planned. If the
intercom goes out and you can't contact Flightwatch or ATC to find out
where the closest open airport is and you've got a real problem It
wouldn't have been a big problem in CAVU but this day it's the third
thing. I don't mean to say that every shortcut you take is going to kill
you but you never know what the third thing is going to be.
There are old pilots and there are bold pilots but there are very few
old bold pilots.
Bill
On 7/16/15 05:52, Charlie England wrote:
> Outlawed in the '70s? Maybe so on that particular connector, but I've
> watched AT&T techs use
> http://www.specialized.net/Specialized/3M-Scotchlok-IDC-UR2-Connectors-1926-AWG-100Pk-4051.aspx
> as recently as a few weeks ago.
>
> I appreciate the 'be safe' sentiment, but 'bet your life' on the
> signal wires in an intercom? Isn't that a bit of a knee-jerk reaction
> to anything unfamiliar? If I'm not mistaken, this list came out of the
> desire to find products and techniques that are *not* 'in common
> aeronautical use', so we can improve on the products and/or
> techniques. We wouldn't have composite airframes (or even aluminum
> ones) if someone hadn't been the 1st to use something that was not 'in
> common aeronautical use'.
>
> It would be more helpful to me if you could say something at least
> marginally quantified, like, 'That terminal fails in 0.05% of
> connections, vs a 0.00004% failure rate for PIDG terminals'.
>
> Thanks,
>
> Charlie
>
> On Wed, Jul 15, 2015 at 5:57 PM, Bill Putney <billp@wwpc.com
> <mailto:billp@wwpc.com>> wrote:
>
> Charlie,
>
> I know splicers use to love these things but even the telco's
> outlawed these in the 70's (i think). I'm surprised you can even
> find them on eBay.
>
> I guess you can use whatever you want to bet your life on in
> experimental but I'd stick with what's in common aeronautical use.
>
> Bill
>
> On 7/15/15 3:12 PM, Charlie England wrote:
>> Anyone know if any type of insulation displacement crimp
>> connectors have ever been used in aircraft applications? I used
>> hundreds (thousands?) of EA-7759 Plain B Wire Connectors, similar to
>> http://www.ebay.com/itm/371364009928?rmvSB=true
>>
>> in burglar alarm & other data cable installations, & never have
>> had a failed connection in 3 decades (though admittedly, I was
>> stripping & twisting the wires prior to crimping). For those who
>> haven't seen these, they have 'teeth' inside that pierce the
>> insulation when crimped.
>>
>> I'm looking at the need to 'daisy chain' several signal grounds
>> from a single dSub pin (in this case, an intercom), and these
>> tiny connectors really look attractive to stagger the joints over
>> several inches of wire near the pin. I tested one by opening the
>> closed end with a pair of pliers, running the 'trunk' wire
>> through the connector, inserting the 'branch' wire, and crimping
>> (no wire stripping involved). Seems to work fine in penetrating
>> the tefzel insulation, and I can't budge the wires with a manual
>> tug test.
>>
>> I have no desire to do this for high current applications, but
>> for signal wires, it sure makes an attractive package due to it's
>> small size. Not sure about the type of insulation, but I'm pretty
>> sure it won't spontaneously combust & drag the plane out of the sky.
>>
>> Thoughts?
>>
>> Charlie
>> *
>>
>>
>> *
>
> *
>
> ist" target="_blank">http://www.matronics.com/Navigator?AeroElectric-List
> tp://forums.matronics.com
> _blank">http://www.matronics.com/contribution
>
> *
>
>
> *
>
>
> *
Message 4
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Subject: | Re: Insulation displacement connectors???? |
>
>It would be more helpful to me if you could say something at least
>marginally quantified, like, 'That terminal fails in 0.05% of
>connections, vs a 0.00004% failure rate for PIDG terminals'.
How about, "I used ID connectors and ribbon cable
in a pitch trim project on a Lear waaayyy back when.
At about the 15-year mark, I inquired of the field
service guys who were supporting that product. Failure
rates were pleasingly low; that product was
a fleet retrofit of about 500+ airplanes and the
pitch trim controllers came in for attention about
5x a year . . . so about 1%/year for the design.
The ID connection devices accounted for about 50% of the
service issues.
Further, that box was located in the vertical fin,
just under the leading edge of the stabilizer . . .
hence, subject to about the worst of the sheltered
environs on the aircraft.
From that experience I would deduce that while
the failure rates for ID connections were low,
they still accounted for the majority of field
failures in the design.
Keep in mind also that the teleco's and network
communities have been using ID connections for
decades . . . of course the environments are not nearly
as severe as the interior of a biz-jet's vertical fin . . .
but still subject to humidity, temperature cycles and
exposure to noxious atmosphere. It would seem that
an ID connector used with wires in the connector's
design window is a low risk venture.
Bob . . .
Message 5
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Subject: | Re: Insulation displacement connectors???? |
>
>Thanks, Bob; I've already got one of those dSub avionics GND busses
>mounted in the plane. My specific application for those crimps is
>the signal ground terminal in a DRE intercom (it has two ground pins
>in the 25pin dSub which are electrically common internally). My
>intent was to run one of the gnd pins to the avionics GND bus and
>the other to the gnd terminals of the various inputs/outputs (mic,
>headset, music, etc) to the intercom. The crimps would have been
>used to bring the various signal ground wires to within the 1st few
>inches of dSub connector on the DRE.
>
>Would it work as well to just take all those signal grounds to the
>avionics dSub ground bus? I was trying to take the signal grounds
>directly to the intercom to keep ground loop possibilities to an
>absolute minimum, and an additional dSub bus for just 3 or 4 wires
>seems to be overkill (and bulky).
The core idea for the AGB was to craft a single
point ground for all signals, power and shields.
If it's just 3-4 wires and just shields, why
not solder and heat-shrink?
In reliability studies, a connector drives up
parts count . . . a soldered joint is calculated
as the joining of several parts into one part
such that there is better than 10 to the minus
bazillion reliability. Solder and shrink is almost
never a bad idea. Is is frowned upon in the factories
because solder is a skill-driven process with tools
that burn fingers, upholstery, carpets, etc. But
for the OBAM aircraft crowd, solder should represent
no unsurmountable hazard.
Bob . . .
Message 6
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Subject: | Re: Insulation displacement connectors???? |
One additional data point. I used IDCs very similar to those in the OP's qu
estion (mine were blue and slightly smaller) to wire an alarm system in my l
ast home in 2004. Those connections were in an attic in Phoenix, where unde
r-roof temperatures were regularly above 120 deg F (no mechanical stress or v
ibration, and very low humidity). The alarm system was functioning perfectl
y when I sold the house in March, almost eleven years after installation.
Eric
> On Jul 16, 2015, at 7:59 AM, Robert L. Nuckolls, III <nuckolls.bob@aeroele
ctric.com> wrote:
>
>>
>> It would be more helpful to me if you could say something at least margin
ally quantified, like, 'That terminal fails in 0.05% of connections, vs a 0.
00004% failure rate for PIDG terminals'.
>
> How about, "I used ID connectors and ribbon cable
> in a pitch trim project on a Lear waaayyy back when.
> At about the 15-year mark, I inquired of the field
> service guys who were supporting that product. Failure
> rates were pleasingly low; that product was
> a fleet retrofit of about 500+ airplanes and the
> pitch trim controllers came in for attention about
> 5x a year . . . so about 1%/year for the design.
> The ID connection devices accounted for about 50% of the
> service issues.
>
> Further, that box was located in the vertical fin,
> just under the leading edge of the stabilizer . . .
> hence, subject to about the worst of the sheltered
> environs on the aircraft.
>
> =46rom that experience I would deduce that while
> the failure rates for ID connections were low,
> they still accounted for the majority of field
> failures in the design.
>
> Keep in mind also that the teleco's and network
> communities have been using ID connections for
> decades . . . of course the environments are not nearly
> as severe as the interior of a biz-jet's vertical fin . . .
> but still subject to humidity, temperature cycles and
> exposure to noxious atmosphere. It would seem that
> an ID connector used with wires in the connector's
> design window is a low risk venture.
>
> Bob . . .
Message 7
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I know that asking about the cause of a buzz in your radios is like asking a
mechanic about a noise you hear when you are driving but since you are all
here and know way more than me I will describe my situation and how I plan
to proceed.
Set-up
RV-6A
GX-60 Com
SL-30 Com
SL-15 Intercom
Two COMANT VHF COMMUNICATIONS
<http://www.aircraftspruce.com/catalog/avpages/comant122.php> antenna
mounted on the centerline of the belly (one below the seat, one below the
baggage compartment)
I am getting significant static like noise when I connect either radio to
the front antenna. I have switched the antennas with no change. The front
antenna connection goes pretty much straight down to the floor with a short
male-male piece of coax (which I have changed with no result) to connect the
female ends of the antenna and radio coax. The antenna wire crosses a bunch
of wires at a 90 degree angle and goes right next to where I have a
temporary battery placed.
My conclusions:
The radios, antennas and cables are all ok so I must be picking up
interference from either the wires or the battery.
Solution:
Move the battery and see if it helps (I would have last night but ran out of
time)
What do you think?
Also, I get a very slight hum when I put my hand near (1 inch away) or touch
the SL-30. It doesn't bother me but I find it interesting that I just have
to get near the radio for the noise to happen.
Thanks all,
Ross Mickey
N9PT
RV-6A
Message 8
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Subject: | Re: Insulation displacement connectors???? |
On July 16, 2015 10:05:36 AM CDT, "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>
wrote:
>
>>
>>Thanks, Bob; I've already got one of those dSub avionics GND busses
>>mounted in the plane. My specific application for those crimps is
>>the signal ground terminal in a DRE intercom (it has two ground pins
>>in the 25pin dSub which are electrically common internally). My
>>intent was to run one of the gnd pins to the avionics GND bus and
>>the other to the gnd terminals of the various inputs/outputs (mic,
>>headset, music, etc) to the intercom. The crimps would have been
>>used to bring the various signal ground wires to within the 1st few
>>inches of dSub connector on the DRE.
>>
>>Would it work as well to just take all those signal grounds to the
>>avionics dSub ground bus? I was trying to take the signal grounds
>>directly to the intercom to keep ground loop possibilities to an
>>absolute minimum, and an additional dSub bus for just 3 or 4 wires
>>seems to be overkill (and bulky).
>
> The core idea for the AGB was to craft a single
> point ground for all signals, power and shields.
> If it's just 3-4 wires and just shields, why
> not solder and heat-shrink?
>
> In reliability studies, a connector drives up
> parts count . . . a soldered joint is calculated
> as the joining of several parts into one part
> such that there is better than 10 to the minus
> bazillion reliability. Solder and shrink is almost
> never a bad idea. Is is frowned upon in the factories
> because solder is a skill-driven process with tools
> that burn fingers, upholstery, carpets, etc. But
> for the OBAM aircraft crowd, solder should represent
> no unsurmountable hazard.
>
>
> Bob . . .
Solder/shrink is what I've done in other places, so that's no problem. But a 10
second operation vs a 10 minute one surely is tempting. :-)
Message 9
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Subject: | Re: Insulation displacement connectors???? |
In a word, no. B connectors are ugly, but work well given two
conditions: (a) DC sealing current to re-establish connection when
compromised by oxidation, and (b) no vibration. The later jelly-B
connectors try to solve the oxidation problem by immersing the pierces
wire in vaseline to keep air out. Not in my airplane.
Message 10
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Subject: | Re: Insulation displacement connectors???? |
In a word, no. B connectors are ugly, but work well given two
conditions: (a) DC sealing current to re-establish connection when
compromised by oxidation, and (b) no vibration. The later jelly-B
connectors try to solve the oxidation problem by immersing the pierces
wire in vaseline to keep air out. Not in my airplane.
Message 11
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More info.
My plane is not in a state that allows me to start the engine (wings are
off) so this is occurring with just the master switch on. No strobes or
landing lights on, just panel instruments on. The main change since I last
used the radios is the installation of a Advanced Flight System 5600 EFIS
but the only wiring from that which are near my antenna cable are the GPS,
Comm Radio and Autopilot serial/ARINC wires.
Ross
From: Ross Home [mailto:rossmickey@comcast.net]
Sent: Thursday, July 16, 2015 8:57 AM
Subject: Radio Buzz
I know that asking about the cause of a buzz in your radios is like asking a
mechanic about a noise you hear when you are driving but since you are all
here and know way more than me I will describe my situation and how I plan
to proceed.
Set-up
RV-6A
GX-60 Com
SL-30 Com
SL-15 Intercom
Two COMANT VHF COMMUNICATIONS
<http://www.aircraftspruce.com/catalog/avpages/comant122.php> antenna
mounted on the centerline of the belly (one below the seat, one below the
baggage compartment)
I am getting significant static like noise when I connect either radio to
the front antenna. I have switched the antennas with no change. The front
antenna connection goes pretty much straight down to the floor with a short
male-male piece of coax (which I have changed with no result) to connect the
female ends of the antenna and radio coax. The antenna wire crosses a bunch
of wires at a 90 degree angle and goes right next to where I have a
temporary battery placed.
My conclusions:
The radios, antennas and cables are all ok so I must be picking up
interference from either the wires or the battery.
Solution:
Move the battery and see if it helps (I would have last night but ran out of
time)
What do you think?
Also, I get a very slight hum when I put my hand near (1 inch away) or touch
the SL-30. It doesn't bother me but I find it interesting that I just have
to get near the radio for the noise to happen.
Thanks all,
Ross Mickey
N9PT
RV-6A
Message 12
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Is the temporary battery powering the avionics? Is the negative battery terminal
grounded to the airframe?
Turn everything on, then measure the voltage between the negative battery terminal
and the radio case. How many millivolts?
Joe
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=444845#444845
Message 13
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Subject: | Re: RE: Radio Buzz |
Ross,
What you are picking up is probably some sort of RFI or EMI. I doubt it will be
coming from your battery unless you have some grounding issues, and may not even
be coming from your wires.
That leaves the noise generators which includes all of your other avionics and
electrical devices and systems including strobes, engine/ignition system, etc.
And that is assuming there is no noise generated because of ground loops in your
aircraft. So the process is to eliminate noise generators, one by one, assuming
there is no noise in your antenna/cable/radio when tested with ALL other
electrical equipment turned off. If your radio still generates noise when you
put your hand near it, I would consider grounding the case.
Then, turn on one electrical device at a time to see if it generates any noise.
With my GX-60, I noticed the Dynon D10A introduced some hum in the system when
turned on. The strobe circuit also introduced some noise. Test each electrical
system sequentially to find the biggest "offenders". This process will give
you some idea of where to look to attempt to reduce noise in the com system.
I recently had my transponder checked and asked about noise in the radio system.
He commented that some noise tended to "go with the territory".
Not necessarily related, I queried him about very loud feedback when attempting
to transmit. Turns out that a setting in the GX-60 for the microphone was set
to the maximum as shipped from the factory. The point here is to also check you
GX-60 setup parameters. Some adjustments there might assist in correcting your
issues.
Doug Windhorn
Message 14
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Subject: | Re: RE: Radio Buzz |
http://www.warbirdinformationexchange.org/phpBB3/viewtopic.php?f=3&t=
52024
From: Ross Home
Sent: Thursday, July 16, 2015 6:19 PM
Subject: AeroElectric-List: RE: Radio Buzz
More info
My plane is not in a state that allows me to start the engine (wings are
off) so this is occurring with just the master switch on. No strobes or
landing lights on, just panel instruments on. The main change since I
last used the radios is the installation of a Advanced Flight System
5600 EFIS but the only wiring from that which are near my antenna cable
are the GPS, Comm Radio and Autopilot serial/ARINC wires.
Ross
From: Ross Home [mailto:rossmickey@comcast.net]
Sent: Thursday, July 16, 2015 8:57 AM
Subject: Radio Buzz
I know that asking about the cause of a buzz in your radios is like
asking a mechanic about a noise you hear when you are driving but since
you are all here and know way more than me I will describe my situation
and how I plan to proceed.
Set-up
RV-6A
GX-60 Com
SL-30 Com
SL-15 Intercom
Two COMANT VHF COMMUNICATIONS antenna mounted on the centerline of the
belly (one below the seat, one below the baggage compartment)
I am getting significant static like noise when I connect either radio
to the front antenna. I have switched the antennas with no change. The
front antenna connection goes pretty much straight down to the floor
with a short male-male piece of coax (which I have changed with no
result) to connect the female ends of the antenna and radio coax. The
antenna wire crosses a bunch of wires at a 90 degree angle and goes
right next to where I have a temporary battery placed.
My conclusions:
The radios, antennas and cables are all ok so I must be picking up
interference from either the wires or the battery.
Solution:
Move the battery and see if it helps (I would have last night but ran
out of time)
What do you think?
Also, I get a very slight hum when I put my hand near (1 inch away) or
touch the SL-30. It doesn=99t bother me but I find it interesting
that I just have to get near the radio for the noise to happen.
Thanks all,
Ross Mickey
N9PT
RV-6A
Message 15
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Subject: | Re: RE: Radio Buzz |
Ooops, cross post.
Do not archive.
From: kboatright1@comcast.net
Sent: Thursday, July 16, 2015 8:15 PM
Subject: Re: AeroElectric-List: RE: Radio Buzz
http://www.warbirdinformationexchange.org/phpBB3/viewtopic.php?f=3&t=
52024
From: Ross Home
Sent: Thursday, July 16, 2015 6:19 PM
Subject: AeroElectric-List: RE: Radio Buzz
More info
My plane is not in a state that allows me to start the engine (wings are
off) so this is occurring with just the master switch on. No strobes or
landing lights on, just panel instruments on. The main change since I
last used the radios is the installation of a Advanced Flight System
5600 EFIS but the only wiring from that which are near my antenna cable
are the GPS, Comm Radio and Autopilot serial/ARINC wires.
Ross
From: Ross Home [mailto:rossmickey@comcast.net]
Sent: Thursday, July 16, 2015 8:57 AM
Subject: Radio Buzz
I know that asking about the cause of a buzz in your radios is like
asking a mechanic about a noise you hear when you are driving but since
you are all here and know way more than me I will describe my situation
and how I plan to proceed.
Set-up
RV-6A
GX-60 Com
SL-30 Com
SL-15 Intercom
Two COMANT VHF COMMUNICATIONS antenna mounted on the centerline of the
belly (one below the seat, one below the baggage compartment)
I am getting significant static like noise when I connect either radio
to the front antenna. I have switched the antennas with no change. The
front antenna connection goes pretty much straight down to the floor
with a short male-male piece of coax (which I have changed with no
result) to connect the female ends of the antenna and radio coax. The
antenna wire crosses a bunch of wires at a 90 degree angle and goes
right next to where I have a temporary battery placed.
My conclusions:
The radios, antennas and cables are all ok so I must be picking up
interference from either the wires or the battery.
Solution:
Move the battery and see if it helps (I would have last night but ran
out of time)
What do you think?
Also, I get a very slight hum when I put my hand near (1 inch away) or
touch the SL-30. It doesn=99t bother me but I find it interesting
that I just have to get near the radio for the noise to happen.
Thanks all,
Ross Mickey
N9PT
RV-6A
href="http://www.matronics.com/Navigator?AeroElectric-List">http://www.
matronics.com/Navigator?AeroElectric-List
href="http://forums.matronics.com">http://forums.matronics.com
href="http://www.matronics.com/contribution">http://www.matronics.com/c
Message 16
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Subject: | Re: RE: Radio Buzz |
On 7/16/2015 6:19 PM, Ross Home wrote:
> My plane is not in a state that allows me to start the engine (wings are
> off) so this is occurring with just the master switch on. No strobes or
> landing lights on, just panel instruments on.
Just a random thought, but is this inside your hangar? Is there
anything on in the hangar, like lights, a refrigerator, etc?
The noise might not be coming from anything in the plane.
-Dj
--
Dj Merrill - N1JOV - EAA Chapter 87
Sportsman 2+2 Builder #7118 N421DJ - http://deej.net/sportsman/
Glastar Flyer N866RH - http://deej.net/glastar/
Message 17
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The last couple of days I have been getting duplicates of every msg from the
Aeroelectric list. Is anyone else having this problem? I don't think it is
on my end since only the list emails are affected.
Bill
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Subject: | Re: RE: Radio Buzz |
Excellent thought. I had squelch break of sorts on my SL30 until I
realized it came and went with the light switch. One florescent tube was
causing its ballast to put out a bunch of RFI. New tube, noise gone.
On 7/16/2015 6:20 PM, Dj Merrill wrote:
>
> On 7/16/2015 6:19 PM, Ross Home wrote:
>> My plane is not in a state that allows me to start the engine (wings are
>> off) so this is occurring with just the master switch on. No strobes or
>> landing lights on, just panel instruments on.
>
> Just a random thought, but is this inside your hangar? Is there
> anything on in the hangar, like lights, a refrigerator, etc?
>
> The noise might not be coming from anything in the plane.
>
> -Dj
>
Message 19
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Subject: | Re: Double Trouble |
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