Today's Message Index:
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1. 12:22 AM - Re: AeroElectric-List Digest: 7 Msgs - 06/09/12 (Franz Fux)
2. 08:21 AM - Re: Re: Found it! (Dan Billingsley)
3. 07:25 PM - Re: ELT Antenna Mount (David Lloyd)
4. 07:35 PM - Re: ELT Antenna Mount (Kelly McMullen)
5. 10:25 PM - Re: ELT Antenna Mount (David Lloyd)
Message 1
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Subject: | Re: AeroElectric-List Digest: 7 Msgs - 06/09/12 |
only intermittent access to e-mail until June 19th, in an urgent matter contact
info@lastfrontierheli.com
Message 2
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I just wanted to stop and thank everyone for their suggestions and help as
I was searching for this gremlin. The fix did turn out to be installing tha
t $11 in-line audio filter into the audio jack on the 396 and sending it on
its way to the intercom. Jumped in, fired it up and taxied around for the
first time in peace and quiet.-=0ADan=0A=0A=0A___________________________
_____=0A From: "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>=0A
M=0ASubject: Re: AeroElectric-List: Re: Found it!=0A =0A=0AAt 09:52 PM 5/29
/2012, you wrote:=0A=0A=0A=0A=0A>=0A>From: "Robert L.=0ANuckolls, III" <nuc
kolls.bob@aeroelectric.com>=0A>=0A>To: aeroelectric-list@matronics.com =0A>
=0A>Sent: Tuesday, May 29, 2012 7:31 PM=0A>=0A>Subject: Re: AeroElectric-Li
st: Re: Found it!=0A>=0A>=0A>At 09:14 PM 5/29/2012, you=0Awrote:=0A>Found t
his thread on VansAirforce-=0Ahttp://www.vansairforce.com/community/showt
hread.php?t=17882 =0A>>It looks like this is a common problem with the Ga
rmin 396. =0A>>Dan=0A>=0A>- Okay, where does the 396 get power ground. Tr
y grounding=0Ait=0A>=0A>- to the same place all the audio-lo or shield gr
ounds get=0A>=0A>- connected.=0A>=0A>=0A>=0A>- Bob . . . =0A>=0A>=0A>Wi
ll take another look Bob.=0AThanks =0A=0A- Just dug up the manual on the
396. I'm 99% certain=0A- that this is a ground loop problem. The telling
=0A- symptom is alternator noise that increases with=0A- ship's loads w
hen substantial currents travel over=0A- the airframe. I'll bet if you mo
ve the Garmin=0A- DC(-) lead to the same ground as all the avionics/=0A
=================
Message 3
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Subject: | Re: ELT Antenna Mount |
Jeff,
I viewed this late. Your are right, way too much signal blocking
structure, but, maybe even worse it is the antenna is positioned
horizontally. The polarization of the signal path is all wrong. It
must mounted vertically...
I am sure that you figured all this out by now....
Dave
-------------------------------------------------------------------------
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----- Original Message -----
From: Jeff Luckey
To: aeroelectric-list@matronics.com
Sent: Saturday, April 07, 2012 10:32 AM
Subject: AeroElectric-List: ELT Antenna Mount
Please see attached picture:
Please understand that my intention is not to be critical, but to
learn.
Is this an effective way to mount an ELT antenna?
I understand why this builder chose to mount it this way. But I have
concerns that there is a great deal of signal-blocking structure very
close to the antenna.
What do you RF gurus think?
-RF neophyte
Message 4
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Subject: | Re: ELT Antenna Mount |
How do you know what the antenna orientation will be after a crash? Only
then will orientation matter.
Even then, orientation to the satellite matters more than orientation to
terrestrial receivers.
Any mounting that prevents the antenna from being broken during the
crash will be better than one that lets the antenna be snapped off by
flipping the plane.
On 6/10/2012 7:17 PM, David Lloyd wrote:
> Jeff,
> I viewed this late. Your are right, way too much signal blocking
> structure, but, maybe even worse it is the antenna is positioned
> horizontally. The polarization of the signal path is all wrong. It
> must mounted vertically...
> I am sure that you figured all this out by now....
> Dave
> ------------------------------------------------------------------------
>
-----
No virus found in this message.
Checked by AVG - www.avg.com
Message 5
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Subject: | Re: ELT Antenna Mount |
Kelly,
I think the majority of crashes usually wind up in horizontal orientation.
If the antenna is mounted vertically in front of the vertical stabilizer in
most crashes that part of the airframe has a good chance of staying fairly
intact even upside down.
About the ELT... the older 121.5 broadcasting on the guard band is usually
not heard by a satellite but, overflying aircraft. The newer higher band
units should reach an overhead satellite. It would be interesting to see
how well the contact goes from an antenna that is oriented horizontally and
close the to earth, i.e. crash site.
I wonder if someone on the List would respond that knows the details about
the new ELT's performance under adverse conditions.
D
_________________________________________________________________
----- Original Message -----
From: "Kelly McMullen" <kellym@aviating.com>
Sent: Sunday, June 10, 2012 7:35 PM
Subject: Re: AeroElectric-List: ELT Antenna Mount
> <kellym@aviating.com>
>
> How do you know what the antenna orientation will be after a crash? Only
> then will orientation matter.
> Even then, orientation to the satellite matters more than orientation to
> terrestrial receivers.
> Any mounting that prevents the antenna from being broken during the crash
> will be better than one that lets the antenna be snapped off by flipping
> the plane.
>
> On 6/10/2012 7:17 PM, David Lloyd wrote:
>> Jeff,
>> I viewed this late. Your are right, way too much signal blocking
>> structure, but, maybe even worse it is the antenna is positioned
>> horizontally. The polarization of the signal path is all wrong. It must
>> mounted vertically...
>> I am sure that you figured all this out by now....
>> Dave
>> ------------------------------------------------------------------------
>>
>
>
> -----
> No virus found in this message.
> Checked by AVG - www.avg.com
>
>
>
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