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Date: Thu, 18 Mar 1999 19:21:16 -0800
From: Bill Watson <willy@cgocable.net>
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Subject: Re: ELT on 121.5 and 243 MHz
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"Dimitrios P." wrote:

> Hello techies out there.
>
> I have a ELT question this time.
>
> I know that the Emmergency Locator Transmitter transmits on 121.5 MHz.  And
> may also be heard at 243.0 MHz.  If you look analyse these frequencies:
>
> 121.5 MHz x 2 = 243.0 MHz
>
> So my question is:  Is the ELT actually transmitting at 121.5 MHz AND 243.0
> MHz OR the 243.0 MHz is a 2nd Harmonic of the 121.5 MHz ?
>
> If the 243.0 MHz is a 2nd Harmonic of 121.5, therefore, you can also listen
> to ELT via its 3rd harmonic wich is 364.5 MHz. (121.5 x 3)
>
> Dimitrios Papadopoulos
>
> Student pilot at Montreal Flying Club
> 14.5 HRS DUAL

I believe that they are the same as commercial radio's that I work on and that
they have filters to block out harmonics.
But it is still possible to receive the 2nd harmonic if your close enough and
depends on the front end of the receiver
how tight it is...

Bill Watson
VE3BNW
Hamilton,Ontario
CANADA
19.3 Dual

