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ELT Antenna for Fiberglass aircraft

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longg(at)pjm.com
Guest

Posted: Fri Apr 18, 2008 10:37 am Post subject: ELT Antenna for Fiberglass aircraft

All,

	I want to install an internal ELT antenna in my fiberglass

aircraft. I am not familiar with the desired wavelength and would like

to ask what folks are using for similar setups. I do not have a ground

plane for antennae and prefer a di-pole setup if possible.

	



Thanks



Do Not Archive

recapen(at)earthlink.net
Guest

Posted: Fri Apr 18, 2008 10:53 am Post subject: ELT Antenna for Fiberglass aircraft

Get the RST engineering antenna book...and antenna kit.....



http://www.rst-engr.com/



--

Bruce(at)glasair.org
Guest

Posted: Fri Apr 18, 2008 11:18 am Post subject: ELT Antenna for Fiberglass aircraft

I could be wrong but I don't think that dipole antennas are around for 406

MHTZ ELT's yet. They exist for 121.5 ELT's but they will be obsolete next

year.



Bruce

www.Glasair.org

 

--

echristley(at)nc.rr.com
Guest

Posted: Fri Apr 18, 2008 11:46 am Post subject: ELT Antenna for Fiberglass aircraft

Bruce Gray wrote:

 	  Quote: 	
		   



 I could be wrong but I don't think that dipole antennas are around for 406

 MHTZ ELT's yet. They exist for 121.5 ELT's but they will be obsolete next

 year.

   


	


You're wrong.  Jim Weir's antennae book shows you how to build one that 

will handle both frequencies.



http://ernest.isa-geek.org/Delta/Pictures/ELTantennae.jpg

ceengland(at)bellsouth.ne
Guest

Posted: Fri Apr 18, 2008 4:24 pm Post subject: ELT Antenna for Fiberglass aircraft

Ernest Christley wrote:

 	  Quote: 	

 <echristley(at)nc.rr.com>

 Bruce Gray wrote:

> 

> <Bruce(at)glasair.org>

>

> I could be wrong but I don't think that dipole antennas are around 

> for 406

> MHTZ ELT's yet. They exist for 121.5 ELT's but they will be obsolete 

> next

> year.

>   

 You're wrong.  Jim Weir's antennae book shows you how to build one 

 that will handle both frequencies.

 http://ernest.isa-geek.org/Delta/Pictures/ELTantennae.jpg 

And the 121.5's aren't going to be obsolete next year, at least in the 

USA. All that's happening is that the satellites will no longer monitor 

that frequency. Not to stir up too much of a firestorm, but loss of 

satellite monitoring for 121.5 will make an almost unmeasurable 

difference in their lifesaving ability.

Unless the price of certified 406's come down a lot, I'll install a 

121.5 & consider buying a 406 PLB. The 121.5 will keep me legal & it 

wouldn't be that hard to rig a G-switch on the PLB.

Of course, the APRS stuff is even better if you don't mind being tracked 

on a cross country.

Charlie

echristley(at)nc.rr.com
Guest

Posted: Sat Apr 19, 2008 9:04 am Post subject: ELT Antenna for Fiberglass aircraft

 	  Quote: 	
		  >

> Bruce Gray wrote:

>> 

>> <Bruce(at)glasair.org>

>>

>> I could be wrong but I don't think that dipole antennas are around 

>> for 406

>> MHTZ ELT's yet. They exist for 121.5 ELT's but they will be obsolete 

>> next

>> year.

>>   

>

> You're wrong.  Jim Weir's antennae book shows you how to build one 

> that will handle both frequencies.

>

> http://ernest.isa-geek.org/Delta/Pictures/ELTantennae.jpg 

I owe Bruce and apology.  It's not until I read a later response that 

*406 MHz* sunk into my thick skull.

ELT's use two frequencies;  neither of which is 406MHz.  You have to 

build the dipole antennae to handle both of the frequencies, and that is 

what I got caught up on.  Not that it would be difficult to build a 

406MHz dipole, it would just be shorter, but there is very likely little 

to no marketed products at the moment.

My sincerest apologies, Bruce.

-- 

http://www.ronpaultimeline.com

BobsV35B(at)aol.com
Guest

Posted: Mon Apr 21, 2008 8:14 am Post subject: ELT Antenna for Fiberglass aircraft

Good Morning Bruce,

  

 Obsolete maybe, but I believe they will still meet federal requirements.  

  

 Is that not true?

  

 Happy  Skies,



Old Bob

AKA

Bob Siegfried

Ancient Aviator

628 West  86th Street

Downers Grove, IL 60516

630 985-8502 

Stearman  N3977A

Brookeridge Air Park LL22

  

  In a message dated 4/18/2008 2:20:30 P.M. Central Daylight Time,  Bruce(at)glasair.org writes:

  	  Quote: 	
		  -->    AeroElectric-List message posted by: "Bruce Gray"    <Bruce(at)glasair.org>



I could be wrong but I don't think that    dipole antennas are around for 406

MHTZ ELT's yet. They exist for 121.5    ELT's but they will be obsolete    next

year.



Bruce

www.Glasair.org



	






Need a new ride? Check out the largest site for U.S. used car listings at AOL Autos.

  [quote][b]

longg(at)pjm.com
Guest

Posted: Tue Apr 22, 2008 6:49 pm Post subject: ELT Antenna for Fiberglass aircraft

Thanks for the feedback. I found two options at

http://www.wingsandwheels.com/page14.htm One option is to attach a

surface mount BNC connector, add a simple ground plane over the top and

stick on a rubber duck. The fancy option is $108.00



Glenn



--

nuckolls.bob(at)cox.net
Guest

Posted: Wed Apr 23, 2008 5:51 am Post subject: ELT Antenna for Fiberglass aircraft

At 10:43 PM 4/22/2008 -0400, you wrote:



 	  Quote: 	
		  



Thanks for the feedback. I found two options at

http://www.wingsandwheels.com/page14.htm One option is to attach a

surface mount BNC connector, add a simple ground plane over the top and

stick on a rubber duck. The fancy option is $108.00



Glenn


	


   A rubber duck for VHF hand held is optimized for

   VHF and has no specified/controlled performance at

   406 Mhz. One can only guess at the Artex ELT product

   but one would like to believe that a qualified ELT

   product includes a multi-frequency antenna.



   If you're willing to go the VHF comm antenna route,

   then consider the Morris loop described at:



http://aeroelectric.com/articles/Morris_Com_Loop_Antenna.pdf



   This will out-perform a 125 Mhz optimized rubber duck

   at all frequencies of interest for ELT performance.



   Bob . . .

Bill Denton

Joined: 10 Jan 2006
Posts: 97
Location: Chicago, IL USA

Posted: Wed Apr 23, 2008 6:15 am Post subject: ELT Antenna for Fiberglass aircraft

JFTR: The Artex 406mHz ELT TSO requires the use of one of the Artex

antennas.



You might want to keep this in mind before deviating...

Thanks!



Bill Denton

bdenton(at)bdenton.com

--

longg(at)pjm.com
Guest

Posted: Thu Apr 24, 2008 6:41 am Post subject: ELT Antenna for Fiberglass aircraft

Thanks Bob et al,

I'll be using 121.5 until someone with a badge walks up to me and says

otherwise. The Morris loop looks like a great option in the < 125 range.



Glenn



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