Today's Message Index:
----------------------
1. 01:03 AM - Re: IMPORTANCE OF ESSAY WRITING (meoos)
2. 08:32 AM - Re: GRT EIS Issues When Transmitting (Robert L. Nuckolls, III)
3. 09:12 AM - Re: GRT EIS Issues When Transmitting (William Hunter)
4. 10:43 AM - Re: AOG question and Shipping address for the AGM battery? (Robert L. Nuckolls, III)
5. 10:44 AM - Re: GRT EIS Issues When Transmitting (Robert L. Nuckolls, III)
Message 1
| INDEX | Back to Main INDEX |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: IMPORTANCE OF ESSAY WRITING |
I want to order thesis on https://paperleaf.ca/do-my-homework/ so the defence would
be assessed with highest mark. I know there is a lot of what they do, abstracts
and homeworks are among them for sure. There are very good reviews about
them. What can you say about this service? Should I trust them? This thesis
is really important for me, it`s just that I can`t screw this up.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=489084#489084
Message 2
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: GRT EIS Issues When Transmitting |
Greeting,
I am posting for a friend who fly a Velocity?and I will get him to
sign up for the Aeroelectric.
His Question:
I need help with further troubleshooting an anomaly.
When I key the radio, all EGT & CHT temps drop about
25 degrees and stay there until the transmission is
released at which time they return to normal. This is
repeatable with the engine running or not. The EIS
has been replaced with a brand new one. I have swapped
radios on the antenna. Whichever radio is using
the stbd antenna causes the anomaly. I inspected
the antenna wire (RG-400) as much as possible without
removing it. No wear or nicks. System, both EIS and
radios have been flawless since installation in 2016.
ALL instrumentation-grade electro-whizzies
have SOME vulnerability to strong local
radio energy. When design goals target
installation in aircraft, the prudent
designer will consider building
a certain level of tolerance to radio
energy. If the device is destined to
fly in TC aircraft, then legacy qualification
testing will have been conducted to verify
the designer's successful achievement of
design goals.
I was unable to quickly locate any info
on GRT claims for environmental robustness
but they've been in the game for a long
time. It seems likely that their products
demonstrate adequate robustness to EM
radiation.
Further, the difficulty you're citing
is a new condition which suggests a
profound CHANGE in conditions between
the antagonist/propagation-path/victim
triad.
As a general rule, electro-whizzies once
demonstrated to meet design goals do
not suddenly go "weak" with respect
to electro-magnetic compatibility.
This is why the FIRST line of investigation
involves researching the propagation-path
which generally consists of things 'hung
out in the breeze' with respect to
potential for damage or failure. The
fact that one of two antennas is unique
to the symptoms strongly suggests some
CHANGE in the pathway between connector
at the radio and the antenna itself.
The first thing I do in these cases is
check antenna SWR (and compare with
other antenna). I think it likely that
you'll find the 'bad' antenna has a
much higher SWR. Damaged coax is the
LEAST likely cause. Disconnection of
either the center conductor or shield
at the connectors is most likely.
A very reasonable test tool for pursuing
this investigation is seen here:
https://tinyurl.com/y64t9nse
Emacs!
(caution, there are both VHF/UHF and
HF versions . . . get the VHF/UHF
device)
You'll probably also need a two-pak
of these adapters:
https://tinyurl.com/y66wn6ua
and a short BncM to BncM jumper cable
https://tinyurl.com/y3b7lvfp
Have even installed a ferrite sleeve on the cht/egt
wire bundle. No change. Transmission and reception
on the radio is loud and clear.
Ferrite sleeves are marginally effective
in meeting original design goals for
EMC . . . we used to see these included in
computer interconnect cables . . .
Emacs!
. . . but in the aviation world, they're
considered an un-acceptable 'band-aid'
to a problem that should be taken care
of INSIDE the electro-whizzies. I don't
even have such things in my inventory.
I have a GRT EIS mounted [at the back of the copilot
side of the airplane] on the floor. The wires run through the
[fiberglass conduit] to the engine.
The closest the antenna gets to the EIS is about 18 inches.
I presume your talking about the ANTENNA COAX
here . . . which should never be a factor
in preventing/fixing an EMC problem.
In the TC aircraft world, coax cables are
routinely routed in bundles with the most
vulnerable and antagonistic of wires
on the aircraft. The coax itself can
become problematic when it's improperly
terminated as discussed above.
Bob . . .
Message 3
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: GRT EIS Issues When Transmitting |
Bob,
As always I am grateful for your help.
I forwarded your response to my friend on the Velocity Owners Builders
Association forum and encouraged him to join the aeroelectric list. A
bunch of the VOBA guys are already here and I hope more will join up.
I will report back on what he discovered the problem was.
Thanks,
Bill Hunter
On Sat, May 4, 2019, 08:39 Robert L. Nuckolls, III <
nuckolls.bob@aeroelectric.com> wrote:
> Greeting,
>
>
> I am posting for a friend who fly a Velocity?and I will get him to sign up
> for the Aeroelectric.
>
>
> His Question:
>
> I need help with further troubleshooting an anomaly.
> When I key the radio, all EGT & CHT temps drop about
> 25 degrees and stay there until the transmission is
> released at which time they return to normal. This is
> repeatable with the engine running or not. The EIS
> has been replaced with a brand new one. I have swapped
> radios on the antenna. Whichever radio is using
> the stbd antenna causes the anomaly. I inspected
> the antenna wire (RG-400) as much as possible without
> removing it. No wear or nicks. System, both EIS and
> radios have been flawless since installation in 2016.
>
> ALL instrumentation-grade electro-whizzies
> have SOME vulnerability to strong local
> radio energy. When design goals target
> installation in aircraft, the prudent
> designer will consider building
> a certain level of tolerance to radio
> energy. If the device is destined to
> fly in TC aircraft, then legacy qualification
> testing will have been conducted to verify
> the designer's successful achievement of
> design goals.
>
> I was unable to quickly locate any info
> on GRT claims for environmental robustness
> but they've been in the game for a long
> time. It seems likely that their products
> demonstrate adequate robustness to EM
> radiation.
>
> Further, the difficulty you're citing
> is a new condition which suggests a
> profound CHANGE in conditions between
> the antagonist/propagation-path/victim
> triad.
>
> As a general rule, electro-whizzies once
> demonstrated to meet design goals do
> not suddenly go "weak" with respect
> to electro-magnetic compatibility.
>
> This is why the FIRST line of investigation
> involves researching the propagation-path
> which generally consists of things 'hung
> out in the breeze' with respect to
> potential for damage or failure. The
> fact that one of two antennas is unique
> to the symptoms strongly suggests some
> CHANGE in the pathway between connector
> at the radio and the antenna itself.
>
> The first thing I do in these cases is
> check antenna SWR (and compare with
> other antenna). I think it likely that
> you'll find the 'bad' antenna has a
> much higher SWR. Damaged coax is the
> LEAST likely cause. Disconnection of
> either the center conductor or shield
> at the connectors is most likely.
>
> A very reasonable test tool for pursuing
> this investigation is seen here:
>
> https://tinyurl.com/y64t9nse
>
> [image: Emacs!]
>
> (caution, there are both VHF/UHF and
> HF versions . . . get the VHF/UHF
> device)
>
> You'll probably also need a two-pak
> of these adapters:
>
> https://tinyurl.com/y66wn6ua
>
> and a short BncM to BncM jumper cable
>
> https://tinyurl.com/y3b7lvfp
>
> Have even installed a ferrite sleeve on the cht/egt
> wire bundle. No change. Transmission and reception
> on the radio is loud and clear.
>
> Ferrite sleeves are marginally effective
> in meeting original design goals for
> EMC . . . we used to see these included in
> computer interconnect cables . . .
>
> [image: Emacs!]
> . . . but in the aviation world, they're
> considered an un-acceptable 'band-aid'
> to a problem that should be taken care
> of INSIDE the electro-whizzies. I don't
> even have such things in my inventory.
>
>
> I have a GRT EIS mounted [at the back of the copilot
> side of the airplane] on the floor. The wires run through the
> [fiberglass conduit] to the engine.
>
>
> The closest the antenna gets to the EIS is about 18 inches.
>
> I presume your talking about the ANTENNA COAX
> here . . . which should never be a factor
> in preventing/fixing an EMC problem.
>
> In the TC aircraft world, coax cables are
> routinely routed in bundles with the most
> vulnerable and antagonistic of wires
> on the aircraft. The coax itself can
> become problematic when it's improperly
> terminated as discussed above.
>
> Bob . . .
>
Message 4
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: AOG question and Shipping address for the AGM battery? |
At 10:58 AM 5/4/2019, you wrote:
>Hi Bob,=C2
>
>I've got a dead charging system away from home
>but, before I ask about that, did you receive the battery I sent?
I did and thank you so much . . . it's
being evaluated as we speak before
letting the Battery Minder do it's
pixie-dust thing . . .
>On to my charging system... It's a typical
>external regulator configuration as shown on
>your basic drawings.=C2 I recently repaired a
>broken b-lead at the alternator and, with that
>repair, I had to replace the regulator. The ANL
>looked good visually but I did not test it.=C2 It tested good after
repair.=C2 =C2
>
>It worked for a 5.5 hr flight flight to Boulder
>City Nevada. Though there was some cycling
>visible on the load meter.=C2 The ANL blew on
>next start.=C2 Cheap voltmeter measures zero ohms
>from alt b+ output measured at the ship side of
>the b+ lead (disconnected fro the rest of the
>ship did wiring) I haven't pulled the alternator
>yet..=C2 while I haven't confirmed there is not a
>short on the b+ lead I think it unlikely.=C2 Do
>alternator diodes fail shorted?=C2 If that
>happens, is my new regulator toast?=C2 I was
>hoping to fix it today but, sigh, I'm not sure I'll find everything I
need...
Yup, that's how they fail. The only way
an ANL should pop is if you've got TWO
or more diodes shorted. The broken b-lead
deprived the regulator of information vital
to keeping alternator output under control.
The regulator would have full-fielded the
alternator causing output to rise to many,
many volts . . . in this case, more than
the diodes could take . . . hence reverse
voltage cascade and meltdown.
Your new regulator is probably just fine.
Bob . . .
Message 5
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: GRT EIS Issues When Transmitting |
At 11:03 AM 5/4/2019, you wrote:
>Bob,=C2
>
>As always I am grateful for your help.=C2
>
>I forwarded your response to my friend on the
>Velocity Owners Builders Association forum and
>encouraged him to join the aeroelectric
>list.=C2 A bunch of the VOBA guys are already
>here and I hope more will join up.=C2
>
>I will report back on what he discovered the problem was.
Please do . . . My missives are always
based on best information I have at the
time . . . but that doesn't rule out
something-new-under-the-sun.
Would be pleased to know the outcome.
Bob . . .
Other Matronics Email List Services
These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.
-- Please support this service by making your Contribution today! --
|