Re: LF: 19:43 136 DF6NM Op32

["Graham" <g8fzk@g8fzk.fsnet.co.uk>]

 

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,

 

 

From: Markus Vester

Sent: Monday, December 30, 2013 8:10 PM

To: rsgb_lf_group@blacksheep.org

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

To: rsgb_lf_group@blacksheep.org

Subject: LF: 19:43 136 DF6NM Op32

GE Markus,
What was it?:)

73
Andrey