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GPS Antenna?

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bakerocb

Joined: 15 Jan 2006
Posts: 727
Location: FAIRFAX VA

Posted: Thu Mar 01, 2007 8:12 pm Post subject: GPS Antenna?

3/1/2006



Hello Fellow Listers, I am trying to identify an object on the bottom of the 

fuselage of a Beech Sierra airplane. It is black plastic about the size of a 

cigar box. Embossed on the bottom of the box is an arrow pointing forward 

and the letters 3M.



It was described at one time as a GPS antenna, but that does not make much 

sense to me. Why would a GPS antenna be on the bottom of the fuselage? I 

also am not able to locate any antenna created by 3M.



Any good ideas? Many thanks.



OC -- The best investment we can make is the effort to gather and understand 

knowledge.

Float Flyr

Joined: 19 Jul 2006
Posts: 2704
Location: Campbellton, Newfoundland

Posted: Thu Mar 01, 2007 8:57 pm Post subject: GPS Antenna?

How about RadAlt?



Noel



[quote] --

_________________
Noel Loveys
Kitfox III-A
Aerocet 1100 Floats

Float Flyr

Joined: 19 Jul 2006
Posts: 2704
Location: Campbellton, Newfoundland

Posted: Thu Mar 01, 2007 9:01 pm Post subject: GPS Antenna?

The size of a cigar box... With an arrow.  That puts a different wheel on

the cart.



That would be a loop antenna for an ADF.  The long wire antenna, porobably

on the top, would be the sense antenna also for the ADF.



Noel



[quote] --

_________________
Noel Loveys
Kitfox III-A
Aerocet 1100 Floats

douglas.dodson(at)pobox.c
Guest

Posted: Fri Mar 02, 2007 6:29 am Post subject: GPS Antenna?

That is likely a stormscope antenna.



Douglas L. Dodson, Jr.

Glasair II-S FT

Flight Test Engineer, CFI-A,G



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kensmith(at)springnet1.co
Guest

Posted: Fri Mar 02, 2007 4:42 pm Post subject: GPS Antenna?

Stormscope Antenna - 3M corporation

 

 Noel Loveys wrote: [quote]   [quote]--> Avionics-List message posted by: "Noel Loveys" <noelloveys(at)yahoo.ca> (noelloveys(at)yahoo.ca)



How about RadAlt?



Noel



       [quote]--

Float Flyr

Joined: 19 Jul 2006
Posts: 2704
Location: Campbellton, Newfoundland

Posted: Fri Mar 02, 2007 6:49 pm Post subject: GPS Antenna?

Storm scope antennas are similar to radar dishes and are mounted in the nose

of the plane. ( assuming it isn't single engine prop)



Noel



[quote] --

_________________
Noel Loveys
Kitfox III-A
Aerocet 1100 Floats

Float Flyr

Joined: 19 Jul 2006
Posts: 2704
Location: Campbellton, Newfoundland

Posted: Fri Mar 02, 2007 7:00 pm Post subject: GPS Antenna?

Just did a Google check on 3M Stormscope and you are absolutely right.  That

makes me wrong... Twice!  The antenna does look a lot like the ADF loop.



Noel



[quote] --

_________________
Noel Loveys
Kitfox III-A
Aerocet 1100 Floats

Bruce(at)glasair.org
Guest

Posted: Fri Mar 02, 2007 7:05 pm Post subject: GPS Antenna?

Storm scopes work by receiving the radio energy produced by the lightning.

Their antennas emit no energy and thus can be mounted at any RFI quite

location on the airframe.



Bruce

www.glasair.org

 



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Float Flyr

Joined: 19 Jul 2006
Posts: 2704
Location: Campbellton, Newfoundland

Posted: Fri Mar 02, 2007 7:57 pm Post subject: GPS Antenna?

Thanks Bruce.  I had it crossed with WX radar.



Noel



[quote] --

_________________
Noel Loveys
Kitfox III-A
Aerocet 1100 Floats

j.rippengal(at)cytanet.co
Guest

Posted: Fri Mar 02, 2007 10:32 pm Post subject: GPS Antenna?

I think that needs just a little qualification. Apart from being in a quiet 

RFI location it must also be unscreened from a low frequency RF point of 

view.

John



From: "Bruce Gray" <Bruce(at)glasair.org>

 	  Quote: 	
		   



 Storm scopes work by receiving the radio energy produced by the lightning.

 Their antennas emit no energy and thus can be mounted at any RFI quite

 location on the airframe.



 Bruce

 www.glasair.org

bakerocb

Joined: 15 Jan 2006
Posts: 727
Location: FAIRFAX VA

Posted: Sat Mar 03, 2007 4:38 am Post subject: GPS Antenna?

3/3/2007



Thanks to all that responded. It is indeed a Stormscope antenna made by 3M 

back in the days when they were replacing Ryan as the manufacturer of that 

equipment.



OC -- The best investment we can make is the effort to gather and understand 

knowledge.



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kensmith(at)springnet1.co
Guest

Posted: Sat Mar 03, 2007 8:05 am Post subject: GPS Antenna?

Could be, Both are about the same physical size.

 

 kensmith(at)springnet1.com (kensmith(at)springnet1.com) wrote: [quote]         Stormscope Antenna - 3M corporation

   

 Noel Loveys wrote:   [quote]     [quote]--> Avionics-List message posted by: "Noel Loveys" <noelloveys(at)yahoo.ca>



How about RadAlt?



Noel



         [quote]--

mlas(at)cox.net
Guest

Posted: Sat Mar 03, 2007 12:59 pm Post subject: GPS Antenna?

I would guess that it is a storm scope antenna (lighting detector).



Mike Larkin



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