---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Sun 06/10/12: 5 ---------------------------------------------------------- Today's Message Index: ---------------------- 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 _____________________________________ Time: 12:22:08 AM PST US From: "Franz Fux" Subject: AeroElectric-List: 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 _____________________________________ Time: 08:21:06 AM PST US From: Dan Billingsley Subject: Re: AeroElectric-List: Re: Found it! 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" =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" =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 _____________________________________ Time: 07:25:47 PM PST US From: "David Lloyd" Subject: Re: AeroElectric-List: 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 ------------------------------------------------------------------------- ------- ----- 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 _____________________________________ Time: 07:35:36 PM PST US From: Kelly McMullen Subject: Re: AeroElectric-List: 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 _____________________________________ Time: 10:25:13 PM PST US From: "David Lloyd" Subject: Re: AeroElectric-List: 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" Sent: Sunday, June 10, 2012 7:35 PM Subject: Re: AeroElectric-List: 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 > > > ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message aeroelectric-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/AeroElectric-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/aeroelectric-list Browse Digests http://www.matronics.com/digest/aeroelectric-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.