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ELT Antenna Length

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tinnemaha(at)hotmail.com
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Posted: Mon Jan 09, 2006 10:15 am Post subject: ELT Antenna Length



I know this is a dumb question, but I think it would be dummer for me not to

ask: In order for it to fit in what I believe to be the best location, I

need to shorten my ELT antenna from 21 inches to 19-3/8 inches. Will that

adversely affect performance? Another location will be very difficult. Can

anyone suggest another solution?

Thanks,

Grant

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skywagon(at)charter.net
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Posted: Mon Jan 09, 2006 12:02 pm Post subject: ELT Antenna Length



Grant,

If you were able to add a "loading" coil to the antenna correctly, this

would allow you to shorten the current antenna. You would need a guru type

friend that knew antennas to accomplish this for you. However, I would bet

that a search of the web via Google would find a manufacturer that makes the

"loaded" antennas for the frequency that you need.

David

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nuckollsr(at)cox.net
Guest

Posted: Mon Jan 09, 2006 5:44 pm Post subject: ELT Antenna Length

`At 10:15 AM 1/9/2006 -0800, you wrote: I know this is a dumb question, but I think it would be dummer for me not to ask: In order for it to fit in what I believe to be the best location, I need to shorten my ELT antenna from 21 inches to 19-3/8 inches. Will that adversely affect performance? Another location will be very difficult. Can anyone suggest another solution?`

I did some tests on a bizjet installation where we substituted
a "rubber-duck" of a VHF-Comm hand-held for a full sized 21 inch
antenna. Differences in gain and pattern were barely discernable.
Bob . . .

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BigD(at)DaveMorris.com
Guest

Posted: Mon Jan 09, 2006 6:35 pm Post subject: ELT Antenna Length

An ELT is an insurance policy you hope to not have to use. Changing the length by 8% will cause the transmitter to no longer reach its maximum distance. Maybe instead of 40 mile range you only get 35. If by shortening it, the SWR goes up to the point that the automatic overload circuitry trips in the ELT and shuts off the transmitter, that wouldn't be good either. Ask the ELT manufacturer about that. If you're going to be doing a lot of flying over the Amazon, you might reconsider. A better question might be what is limiting the length to 19 3/8? Is it a metal panel? Proximity to metal would be an even more serious problem than an 8% shorter antenna. Can you bend the antenna and keep its length? Dave Morris At 12:15 PM 1/9/2006, you wrote: I know this is a dumb question, but I think it would be dummer for me not to ask: In order for it to fit in what I believe to be the best location, I need to shorten my ELT antenna from 21 inches to 19-3/8 inches. Will that adversely affect performance? Another location will be very difficult. Can anyone suggest another solution? Thanks, Grant

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nuckollsr(at)cox.net
Guest

Posted: Mon Jan 09, 2006 7:21 pm Post subject: ELT Antenna Length



Grant,

Is this antenna "inside" or does it mount out in the breeze?

Bob . . .

At 12:01 PM 1/9/2006 -0800, you wrote:

Grant,

If you were able to add a "loading" coil to the antenna correctly, this

would allow you to shorten the current antenna. You would need a guru type

friend that knew antennas to accomplish this for you. However, I would bet

that a search of the web via Google would find a manufacturer that makes the

"loaded" antennas for the frequency that you need.

David

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wschertz(at)ispwest.com
Guest

Posted: Tue Jan 10, 2006 8:15 pm Post subject: ELT Antenna Length



Go to a wood working store/catalog and by a drill bit for boring through

lamp bases ~18" long, then you could go up through all three ribs if I

understand your statement below correctly.

Bill Schertz

KIS Cruiser # 4045

I want to

 	  Quote: 	
		   mount the base of the antenna in the fuselage & extend the antenna up into

the already covered portion of the vert stab.

The antenna that came with my ELT has a ~3" high rubber cone at the base

out

of which extends about 18 more inches of small diameter metal rod. I

drilled small holes in the bottom two ribs of the stabilizer, but the

third

one I can't reach with a drill bit.

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