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jlisler(at)alltel.net
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 Posted: Thu Feb 08, 2007 6:37 pm Post subject: ELT Antenna |
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What is your current opinion of where the ELT antenna should be installed on
an RV-4? My ACK ELT is mounted on the upper shelf of the baggage
compartment. I am leaning toward mounting the antenna on the topside of the
turtle deck right behind the canopy. If you have a snappy location that is
better concealed I would like to know. The airplane is finished and this is
one of the small details I have left to complete.
Also, what does the large molded rubber base do on the ELT antenna? Is it a
strain relief to keep the antenna from snapping off in the breeze at 200+
MPH? Does it cover something up like a coil or what ever? I want to be able
to trim this rubber off so I can possibly mount the antenna inside the
cabin. However I do not want to destroy the antenna by sawing off something
important.
Jerry Isler
Donalsonville, GA
RV4 N455J
Cessna C140A N9641A
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rice737(at)msn.com
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| Posted: Thu Feb 08, 2007 8:14 pm Post subject: ELT Antenna |
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<?xml:namespace prefix="v" /><?xml:namespace prefix="o" /><![endif]--> Hey Jerry,
I just mounted mine in my -8 on the rear seat arm rest as far back as possible and zip tied it around the curve of the fuselage thru a hole just large enough to get the zip tie thru. I saw it somewhere else and copied the idea. It is now out of the way, not creating drag, and doen't hinder the rear seater.
See you in the air.
Paul Rice
[quote] ---
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Hopperdhh(at)aol.com
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| Posted: Fri Feb 09, 2007 6:29 am Post subject: ELT Antenna |
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Jerry,
If you put the antenna inside the cabin, then it is essentially no longer an
antenna. At least not a very effective one. If you want it to be a good
antenna, on the turtle deck is the right place.
If the antenna is about 1/4 wavelength (about 24 inches) then there is
probably nothing in the base -- it is just an insulator. You can check this with an
ohmmeter. If it is shorter that 24 inches, then there is probably a loading
coil in the base.
Most RVers sacrifice the ability of the antenna to radiate and put it inside
the cabin or even in the empennage fairing at the base of the vertical stab.
I guarantee no one will here it more than 100 yards away if it is put there
(at the base of the stab)!
In my own case, I have the antenna in the baggage compartment mounted to one
of the side ribs, and leaning toward the center of the free space there. In
other words probably the best location inside the airplane. Once the ELT was
accidentally left on for about 2 hours outdoors, and I never heard from anyone!
Dan Hopper K9WEK
RV-7A
In a message dated 2/8/2007 9:38:58 PM Eastern Standard Time,
jlisler(at)alltel.net writes:
What is your current opinion of where the ELT antenna should be installed on
an RV-4? My ACK ELT is mounted on the upper shelf of the baggage
compartment. I am leaning toward mounting the antenna on the topside of the
turtle deck right behind the canopy. If you have a snappy location that is
better concealed I would like to know. The airplane is finished and this is
one of the small details I have left to complete.
Also, what does the large molded rubber base do on the ELT antenna? Is it a
strain relief to keep the antenna from snapping off in the breeze at 200+
MPH? Does it cover something up like a coil or what ever? I want to be able
to trim this rubber off so I can possibly mount the antenna inside the
cabin. However I do not want to destroy the antenna by sawing off something
important.
Jerry Isler
Donalsonville, GA
RV4 N455J
Cessna C140A N9641A
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ronlee(at)pcisys.net
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| Posted: Fri Feb 09, 2007 7:21 am Post subject: ELT Antenna |
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| Quote: | Most RVers sacrifice the ability of the antenna to radiate and put it inside
the cabin or even in the empennage fairing at the base of the vertical stab.
I guarantee no one will here it more than 100 yards away if it is put there
(at the base of the stab)!
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I have mine there (horizontal stab area). If you really want to be found
then look into a GPS-enabled 406 MHz PLB such as the McMurdo
Fastfind. Of course you have to manually activate it but I would rate
it far higher as a method to be rescued.
Ron Lee
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carlosh(at)sec-engr.com
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| Posted: Fri Feb 09, 2007 7:59 am Post subject: ELT Antenna |
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Ron Lee wrote:
| Quote: |
> Most RVers sacrifice the ability of the antenna to radiate and put it
> inside
> the cabin or even in the empennage fairing at the base of the
> vertical stab.
> I guarantee no one will here it more than 100 yards away if it is put
> there
> (at the base of the stab)!
I have mine there (horizontal stab area). If you really want to be found
then look into a GPS-enabled 406 MHz PLB such as the McMurdo
Fastfind. Of course you have to manually activate it but I would rate
it far higher as a method to be rescued.
Ron Lee
Speaking of ELT's, I read yesterday that the older ELT will no longer
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exist as of 2009 and the newer 406 will be required. Anyone have a place
I can get more info on this? I'm on the empennage now and will most
likely not be finished until 09 or later.
Carlos in AZ
RV7A
--
Carlos Hernandez <carlosh(at)sec-engr.com>
Structural Engineers, LLC
2963 W. Elliot Rd. - Suite 3
Chandler, AZ 85224
Phone: 480.968.8600
Fax: 480.968.8608
www.sec-engr.com
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stevea(at)svpal.org
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| Posted: Fri Feb 09, 2007 9:15 am Post subject: ELT Antenna |
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Airtex has a link on their website.
http://www.artex.net/
Scroll down the page to the "121.5 MHz Phaseout, Future ELT Requirements
Announcement".
More info from AOPA. The March 2005 article is a bit dated on price and
availability of the 403MHz ELTs, but the background info is correct.
http://www.aopa.org/whatsnew/regulatory/elt.html
Steve
RV-6A
carlos wrote:
| Quote: | Speaking of ELT's, I read yesterday that the older ELT will no longer
exist as of 2009 and the newer 406 will be required. Anyone have a
place I can get more info on this? I'm on the empennage now and will
most likely not be finished until 09 or later.
|
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d-burton(at)comcast.net
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| Posted: Fri Feb 09, 2007 9:38 am Post subject: ELT Antenna |
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Speaking of ELT's, I read yesterday that the older ELT will no longer
exist as of 2009 and the newer 406 will be required. Anyone have a place
I can get more info on this? I'm on the empennage now and will most
likely not be finished until 09 or later.
Carlos in AZ
RV7A
Satellite monitoring of 121.5 is scheduled to cease January 2009. All other
monitoring of the frequency will continue. As of now there is no FAA
requirement to replace old ELTs. Your chance of being found quickly without
satellite monitoring is poor though. The new ELTs are much more capable and
should significantly reduce the number of false alerts. Hopefully the
response to activation will be significantly more successful. It's up to us
to decide whether or not to upgrade our ELTs.
Dave
Flying 172/182
Building RV6
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ronlee(at)pcisys.net
Guest
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| Posted: Fri Feb 09, 2007 10:35 am Post subject: ELT Antenna |
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| Quote: | Satellite monitoring of 121.5 is scheduled to cease January 2009. All other
monitoring of the frequency will continue. As of now there is no FAA
requirement to replace old ELTs. Your chance of being found quickly without
satellite monitoring is poor though. The new ELTs are much more capable and
should significantly reduce the number of false alerts. Hopefully the
response to activation will be significantly more successful. It's up to us
to decide whether or not to upgrade our ELTs.
Dave
|
Correct. As of now, I know of no mandate to switch over to 406 MHz ELTs.
I do fly over desolate areas so I bought a McMurdo Fastfind Plus PLB which
in theory could be transmitting my actual location to S&R before I contact
terra firma. And they will know that it is me and then decide whether I am
worth
trying to rescue (just kidding).
Bottom line is that I do not count on the ELT.
If any term is unknown do a google search for the term.
Ron Lee
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ceengland(at)bellsouth.ne
Guest
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| Posted: Fri Feb 09, 2007 1:42 pm Post subject: ELT Antenna |
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If this is the wire whip antenna on a cone shaped rubber base, it might
be vulnerable to fatigue if mounted behind the canopy on a -4. I had one
break off at the top of the cone. It's pretty turbulent behind the canopy.
As to effectiveness, that's been debated before, but old style elt's are
statistically & demonstrably ineffective, anyway. The odds of it
actually activating when you need it, being heard, and anyone being able
to locate it before the battery runs down if it is heard are so bad that
any concern with mounting location seems pointless. My attitude is, put
it where it won't cause any drag & forget about it. Then get a personal
locater beacon with gps to actually be rescued. Get creative & put a
G-switch on it yourself if you want auto activation.
Charlie
Hopperdhh(at)aol.com wrote:
| Quote: |
Jerry,
If you put the antenna inside the cabin, then it is essentially no longer an
antenna. At least not a very effective one. If you want it to be a good
antenna, on the turtle deck is the right place.
If the antenna is about 1/4 wavelength (about 24 inches) then there is
probably nothing in the base -- it is just an insulator. You can check this with an
ohmmeter. If it is shorter that 24 inches, then there is probably a loading
coil in the base.
Most RVers sacrifice the ability of the antenna to radiate and put it inside
the cabin or even in the empennage fairing at the base of the vertical stab.
I guarantee no one will here it more than 100 yards away if it is put there
(at the base of the stab)!
In my own case, I have the antenna in the baggage compartment mounted to one
of the side ribs, and leaning toward the center of the free space there. In
other words probably the best location inside the airplane. Once the ELT was
accidentally left on for about 2 hours outdoors, and I never heard from anyone!
Dan Hopper K9WEK
RV-7A
In a message dated 2/8/2007 9:38:58 PM Eastern Standard Time,
jlisler(at)alltel.net writes:
What is your current opinion of where the ELT antenna should be installed on
an RV-4? My ACK ELT is mounted on the upper shelf of the baggage
compartment. I am leaning toward mounting the antenna on the topside of the
turtle deck right behind the canopy. If you have a snappy location that is
better concealed I would like to know. The airplane is finished and this is
one of the small details I have left to complete.
Also, what does the large molded rubber base do on the ELT antenna? Is it a
strain relief to keep the antenna from snapping off in the breeze at 200+
MPH? Does it cover something up like a coil or what ever? I want to be able
to trim this rubber off so I can possibly mount the antenna inside the
cabin. However I do not want to destroy the antenna by sawing off something
important.
Jerry Isler
Donalsonville, GA
RV4 N455J
Cessna C140A N9641A
|
| | - The Matronics RV-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?RV-List |
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