Re: LF: VO1NA Opera-32

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

Marcus,

 

Interesting  test .  but  in this  case , is not  the  opds   the  control , as  it  was  previously  fed  via the  SL  conditioning  path ? and Op  fed  directly  , which  gave a  higher  sig-noise  ?

 

If the  two  systems  are now  reading  more  closely , then that  would  indicate the  SL conditioning  , is  degrading the  Op decoder  ? this  would  be  as  expected

 

The only  acid  test  would  be  a  raw  off-air  recording  , that could  be  post  processed  and  evaluated  ?

 

According  to the  this , the  modulation  is   HF of the  carrier , with the  sdr  there  is  no   'splash'   but  using  a  conventional  Rx , there  is a  'splash'   across  the  band  .. closer in  , are there  side bands  ?

 

73 -G..

 

 

 

 

 

 

 

 

 

 

 

 

From: Markus Vester

Sent: Tuesday, June 25, 2013 10:47 AM

To: rsgb_lf_group@blacksheep.org ; rsgb_lf_group@yahoogroups.co.uk

Subject: Re: LF: VO1NA Opera-32

The noiseblanker against DCF39 splatter seems to have improved decoding by the original Opera software. Three spots from G3XDV and VO1NA were received by both methods with comparable SNR figures, with opds correlation adding in another weak spot at 0:27.

 

 df6nm.bplaced.net/opera/Opera_vs_opds_130624-25.txt

Best 73,

Markus (DF6NM)

 

-----Ursprüngliche Mitteilung-----
Von: Markus Vester <markusvester@aol.com>
An: rsgb_lf_group <rsgb_lf_group@blacksheep.org>; rsgb_lf_group <rsgb_lf_group@yahoogroups.co.uk>
Verschickt: Mo, 24 Jun 2013 9:41 pm
Betreff: Re: LF: VO1NA Opera-32

Thanks Joe. From your QTH, Magdeburg should be around 60 deg azimuth (roughly northeast), so DCF39 would indeed have been significantly attenuated by the loop.

 

Although generally not recommended, I will now try to insert the same bandpass and noiseblanker before Opera to cut out the DCF telegrams, and run it in parallel to opds again.

 

Best 73,

Markus (DF6NM)