Matronics Email Lists :: View topic - OEM or home-made ELT antennas?

Matronics Email Lists
Web Forum Interface to the Matronics Email Lists

Get Email Distribution Too! FAQ Search Memberlist Usergroups Register

Profile Log in to check your private messages Log in

OEM or home-made ELT antennas?

Matronics Email Lists Forum Index -> AeroElectric-List

View previous topic :: View next topic

Author Message

wynaire(at)citlink.net
Guest

Posted: Sat Oct 06, 2012 10:52 am Post subject: OEM or home-made ELT antennas?

Hello Bob, et al:

 I found and purchased a  NOS "ACK ELT", w/o a fixed [fuselage] antenna. I plan to  install in  the Lancair [composite beast].

 Your opinion please on whether to  go dirt cheap and build an antenna to install, or buy the OEM [ACK]  version?  

 Ques. #2: Is it always best to use  the ELT's manufacturers antenna design, rather than someone elses, that looks  comparable/compatible?  I have a Garrett ELT antenna & base {p/n  615363-1} with a couple of tuner-coils (?) imbeded in epoxy in the  base....  Haven't found any info on the net.      

 Thanks in advance,

 Mike W.

 Moab,  UT

   [quote][b]

- The Matronics AeroElectric-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?AeroElectric-List

rickofudall

Joined: 19 Sep 2009
Posts: 1392
Location: Udall, KS, USA

Posted: Sat Oct 06, 2012 3:41 pm Post subject: OEM or home-made ELT antennas?

Mike, I had this conversation with the local FSDO about two months ago. The antenna is part of the TSO for the ELT. Even on an experimental it's not legal to put on anything but the manufacturers antenna. Sorry to be the bearer of bad news. 



Rick Girard



On Sat, Oct 6, 2012 at 1:51 PM, Mike Wynn <wynaire(at)citlink.net (wynaire(at)citlink.net)> wrote:

 	  Quote: 	
		          Hello Bob, et al:

 I found and purchased a  NOS "ACK ELT", w/o a fixed [fuselage] antenna. I plan to  install in  the Lancair [composite beast].

 Your opinion please on whether to  go dirt cheap and build an antenna to install, or buy the OEM [ACK]  version?  

 Ques. #2: Is it always best to use  the ELT's manufacturers antenna design, rather than someone elses, that looks  comparable/compatible?  I have a Garrett ELT antenna & base {p/n  615363-1} with a couple of tuner-coils (?) imbeded in epoxy in the  base....  Haven't found any info on the net.      

 Thanks in advance,

 Mike W.

 Moab,  UT

    	  Quote: 	
		  



ist" target="_blank">http://www.matronics.com/Navigator?AeroElectric-List

tp://forums.matronics.com

_blank">http://www.matronics.com/contribution



	


	




-- 

Zulu Delta

Mk IIIC

Thanks, Homer GBYM

It isn't necessary to have relatives in Kansas City in order to be unhappy.

   - Groucho Marx



 

  [quote][b]

- The Matronics AeroElectric-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?AeroElectric-List

_________________
The smallest miracle right in front of you is enough to make you happy....

wynaire(at)citlink.net
Guest

Posted: Sat Oct 06, 2012 10:26 pm Post subject: OEM or home-made ELT antennas?

Hi Rick,

 I kinda' suspected the same from  not finding any info on BN's site or his book. And, that's why I asked.  Probably less expensive [to buy the OEM item] in the long run.

 Thanks very much for your quick  reply. 

 Mike W.

 *********

 [quote]   ---

- The Matronics AeroElectric-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?AeroElectric-List

aerobubba(at)earthlink.ne
Guest

Posted: Sun Oct 07, 2012 2:09 am Post subject: OEM or home-made ELT antennas?

Hmmm....

I smell a rat.

With all due respect to having to live with the local sherriff, my understanding is that the ONLY thing required to actually be TSO'd on an experimental is a GPS planned for use in termminal operations.  Other things needed to be TSO compliant, but that is different from wearing a sticker.

Thoughts, Bob?

 	  Quote: 	
		  Time: 04:41:31 PM PST US

Subject: Re: Fw: OEM or home-made ELT antennas?

From: Richard Girard <aslsa.rng(at)gmail.com>

Mike, I had this conversation with the local FSDO about two months ago. The

antenna is part of the TSO for the ELT. Even on an experimental it's not

legal to put on anything but the manufacturers antenna. Sorry to be the

bearer of bad news.

Rick Girard

On Sat, Oct 6, 2012 at 1:51 PM, Mike Wynn <wynaire(at)citlink.net> wrote:

> **

> Hello Bob, et al:

> I found and purchased a NOS "ACK ELT", w/o a fixed [fuselage] antenna. I

> plan to  install in the Lancair [composite beast].

> Your opinion please on whether to go dirt cheap and build an antenna to

> install, or buy the OEM [ACK] version?

> Ques. #2: Is it always best to use the ELT's manufacturers antenna design,

> rather than someone elses, that looks comparable/compatible?  I have a

> Garrett ELT antenna & base {p/n 615363-1} with a couple of tuner-coils (?)

> imbeded in epoxy in the base....  Haven't found any info on the net.

> Thanks in advance,

> Mike W.

> Moab, UT

Glen Matejcek

- The Matronics AeroElectric-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?AeroElectric-List

nuckolls.bob(at)aeroelect
Guest

Posted: Sun Oct 07, 2012 8:45 am Post subject: OEM or home-made ELT antennas?

At 01:51 PM 10/6/2012, you wrote:

  	  Quote: 	
		   Hello Bob, et al:

 I found and purchased a NOS "ACK ELT", w/o a fixed [fuselage] antenna. I plan to  install in the Lancair [composite beast].

 Your opinion please on whether to go dirt cheap and build an antenna to install, or buy the OEM [ACK] version?  

 Ques. #2: Is it always best to use the ELT's manufacturers antenna design, rather than someone elses, that looks comparable/compatible?  I have a Garrett ELT antenna & base {p/n 615363-1} with a couple of tuner-coils (?) imbeded in epoxy in the base....  Haven't found any info on the net.     

 Thanks in advance,

 Mike W.

 Moab, UT 	


   From a purely technical perspective:



   If this were a legacy 121.5 "hope it will work"

   type ELT, then any VHF comm antenna would perform as well

   as the 'stock 'antenna supplied with the ELT.



   The modern two-frequency ELTs require either two

   separate antennas (like those on the Beechjet)



 

  [img]cid:.0[/img]



    Or a muti-band antenna tailored to the task. It's likely that

    ANY 121.5/406 antenna would work just fine but given

    the relative level of understanding by any individual likely

    to take regulatory notice, likelihood of getting a

    substitution approved is very low.



    They are skilled in the reading of labels and checking

    of boxes on forms, not skilled judging the suitability

    of any substitution to a task.



    From the regulatory perspective:



    Irrespective of the technical validity of any substitute

    you might find, the risk for having it become some

    kind of  . . . uh . . . bump in the road is not zero.



    The term TSO appears 52 times in the latest version of

    Part 91 just downloaded. It speaks to all manner of

    panel mounted electro-whizzies including ELTs. TSO's

    are becoming a kind of executive order that exerts

    a force "for our own good." Resistance is futile, we

    will be assimilated.

   



 

   Bob . . .

- The Matronics AeroElectric-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?AeroElectric-List

294b05a.jpg

Description:

Filesize:

175.22 KB

Viewed:

2145 Time(s)

dlj04(at)josephson.com
Guest

Posted: Mon Oct 08, 2012 5:21 pm Post subject: OEM or home-made ELT antennas?

TSO requirements are not necessarily associated with the airframe 

certification, but in order to operate in the national airspace system 

certain "approved" items are needed, such as ELTs and transponders. The 

requirement is in Part 91 (general operating and flight rules), not Part 

23 or some other airworthiness requirement so it's the same for all 

aircraft.



Many early ELTs had very primitive circuit designs in order to operate 

at 121.5 and 243 MHz, which resulted in antennas that didn't look like 

traditional quarter-wave whips at either frequency. The antenna is part 

of the design.



Also, if you are to operate an aircraft with an ELT installed after 

March 1998, in order to be "approved" it has to be certified to TSO 

C91a, not the older C91. Many of the bargain ELTs in flymarkets work, 

but are illegal to use once they have been removed from the aircraft in 

which they were originally installed. If you have a C91 ELT there had 

better be a logbook entry documenting its installation prior to 1998.

- The Matronics AeroElectric-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?AeroElectric-List

wynaire(at)citlink.net
Guest

Posted: Mon Oct 08, 2012 11:38 pm Post subject: OEM or home-made ELT antennas?

Thanks for the info. Good point as well.

My NOS ACK ELT was never installed in an ac, but is certified to C91a, 

fortunately.

Luck of the Irish..   And an OEM antenna is on order.

Mike W.

******************



---

- The Matronics AeroElectric-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?AeroElectric-List

Display posts from previous:

	Matronics Email Lists Forum Index -> AeroElectric-List	All times are GMT - 8 Hours
Page 1 of 1

Jump to:

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum