[amsat-bb] Re:LEILA

["Stacey E. Mills" <w4sm@xxxxxxxxxx>]

>The "real" LEILA notches the offending signal when the siren tone is 
>generated.
>  It think it may notch for a couple seconds after the siren tone (I'm not 
> sure).
>
>We should be able to determine whether a LEILA siren tone is authentic or not
>by listening for the notched uplink signal.  When you hear the siren tone, 
>try
>whistling or speaking loudly into your microphone to see if your signal is
>notched or not.
>
>Perhaps the LEILA designers can offer more specific advice on how to
>distinguish between the real LEILA and a recorded LEILA siren tone.
>
>Wayne Estes W9AE
>Mundelein, IL, USA

Wayne is correct that the real LEILA, as currently configured, should notch 
the "offending" signal during the siren tone and for a couple seconds after 
the tone ceases.

I must admit that when listening a couple of nights ago, I heard several 
apparent LEILA's where the underlying signal was not notched.  In fact, the 
non-notched LEILA's outnumbered the ones with notching by more than 2 to 1, 
at least while I was listening.  I wondered if there might be a problem 
with LEILA-2, but I think we now have the better explanation.  We have one 
or more ground-based LEILA "wanna be's".




-- 
  ________________________________________________________________________
  Stacey E. Mills, W4SM    WWW:    http://www.cstone.net/~w4sm/ham1.html
    Charlottesville, VA     PGP key: http://www.cstone.net/~w4sm/key
  ________________________________________________________________________

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