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Re: LF: VO1NA Op32 137.555 kHz

To: <[email protected]>
Subject: Re: LF: VO1NA Op32 137.555 kHz
From: "Graham" <[email protected]>
Date: Fri, 28 Jun 2013 22:42:54 +0100
Importance: Normal
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Ok Marcus ,
 
Needs  must , I dont  think the   frequency  translation  would be  a  problem, but any modification  to the  envelope parameters  will  degrade  performance ,  the  low  s/n sdr  decodes  , point to  the  lack  of  'ringing'  in the  filters , enabling  much lower  levels , notably , using the  £5   dongle  in direct-sample  , I see  the  modulation  is  HF of the  carrier  , where  with  any  of the  conventional  Rx's  , there is a  splash  across  the  band .
 
Strange that  Iceland  has not  shown a  decode  , its about  1000  K  north  of the  direct  path and  half the  range ,    expected  ?
 
73 -G.
 
 
 
 
Sent: Friday, June 28, 2013 8:53 PM
Subject: Re: LF: VO1NA Op32 137.555 kHz

yes. I'm aware that Opera should nominally be fed with straight full-band SSB. But going by the first results, the preprocessing seemed to help a lot in the presence of our strong DCF splatters, so I left it in. In any case I'd need SL as an audio mixer to accomodate my fixed 135.5 kHz LO.
 
Best 73,
Markus
 
 
 
 

From: Graham
Sent: Friday, June 28, 2013 2:55 PM
Subject: Re: LF: VO1NA Op32 137.555 kHz

Marcus ,
 
Is the  feed  to   Opera   still    being  pre-processed  via  SL  ?
 
G..
 
Sent: Friday, June 28, 2013 9:50 AM
Subject: Re: LF: VO1NA Op32 137.555 kHz

Hi Joe,
 
during this week, your signal has been detected here every single night, along with Mike and Spiros.
 
I have been running the "deep search" correlation detector in parallel with the original Opera software. Here's the number of spots received here in five nights since  Sunday:
 
call   opds   Opera
       hits  decodes
 
VO1NA   12      1
SV8CS    8      4
G3XDV   11      8
Detailed list: http:\\ df6nm.bplaced.net/opera/Opera_vs_opds.txt  (please remove space in link).
 
Best 73, and thanks for the fine signals!
 
Markus (DF6NM)

Sent: Thursday, June 27, 2013 11:54 PM
Subject: LF: VO1NA Op32 137.555 kHz

Dear Group,

Will be QRV tonight and grateful for any report.

73
Joe
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