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Re: LF: Multi-function beacon

To: [email protected]
Subject: Re: LF: Multi-function beacon
From: Andy Talbot <[email protected]>
Date: Fri, 6 Mar 2009 20:13:32 +0000
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Not strictly -
Look at it in th efreqeuncy domain.  A 500us pulse has its first zero at 2000/pi = 637Hz, so most of the energy is within 1300Hz bandwidth, and a substantial part will pass though the Rx filter.  It will be extended in time and flattenned, but the detection algorithm finds the peak, in effect applying an inverse transform of the SSB filter.

Andy  G4JNT
www.g4jnt.com

 
 
Nb   the  pulse width , 500uS .. that's a bit  sharp for a ssb filter , only  1.5 cycles at 3 Khz ... ?
 
 
 
 
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