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Re: LF: 19:43 136 DF6NM Op32

To: <[email protected]>
Subject: Re: LF: 19:43 136 DF6NM Op32
From: "Graham" <[email protected]>
Date: Mon, 30 Dec 2013 21:37:34 -0000
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Ah 2FSK   ,   Could  call  it  Redundant  Tone Transmitting  sYstem    or   RTTY  for  short  ; -)
 
But , yes,  Opera  decoder  is  backwards compatible to  FSK beacons  , either shifting  inside the  decoder  pass  band or  outside , as long as the 
shift is  past the  gaud  band  of a  few 100 mHz  ,
 
G,
 
 

Sent: Monday, December 30, 2013 8:10 PM
Subject: Re: LF: 19:43 136 DF6NM Op32

only a test with DFCW-Opera ;-). Just another idea to generate an Opera signal with an uninterrupted carrier, as a workaround for transmitters with flipflops. The upper frequency carries the desired modulation, the lower one just dumps the carrier during the gaps. Choosing the FSK shift as a multiple of the symbol rate preserves the phase.
 
Due to poor energy efficiency, this is NOT the recommended technique to generate a coherent carrier;-)
 
Best 73,
MArkus
 
 

From: rn3agc
Sent: Monday, December 30, 2013 8:49 PM
Subject: LF: 19:43 136 DF6NM Op32

GE Markus,
What was it?:)

73
Andrey

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