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From: "Graham" <g8fzk@g8fzk.fsnet.co.uk>
To: <rsgb_lf_group@blacksheep.org>
References: <005d01cefd22$36f84a00$6401a8c0@JAYDELL>
In-Reply-To: <005d01cefd22$36f84a00$6401a8c0@JAYDELL>
Date: Fri, 20 Dec 2013 17:40:45 -0000
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Subject: Re: LF: OPERA overload?
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Status: O

Jay,

Just pulled these back  from the  psk-data base ,

+ 8    OPERA 0.477 20/12/2013 00:15 United States 1387498502  WE6XGR FN12LQ 
WD2XNS
+ 8   OPERA 0.477 20/12/2013 00:32 United States 1387499533  WE6XGR FN12LQ 
WD2XNS

+8 is 5/6 db up on my signal  over   25 miles  range ,

That's definitely one  up from  'Cookie'  more to  Tall Boy , if Bob  runs 
to   double  figures , then  may be  'Grand Slam'

The spectrum  w/f has no  link to the  decode  engine , but  , yes under 
those  conditions the  noise floor  is  going to  be  much higher

Can you generate a local  signal  100% op4   , see if  Bob  will  run the 
timer , give you  4 tx 8 rx  window   , that  would  give a value to the 
drop ?

Use something  like  spec-lab to give a  better  view , the  w/f in Op is 
only a  indicator / tune  aid , what happens to  the  noise floor , carrier 
on  / off  ?

73-G,

--------------------------------------------------
From: <jrusgrove@comcast.net>
Sent: Friday, December 20, 2013 1:24 AM
To: <rsgb_lf_group@blacksheep.org>
Subject: LF: OPERA overload?

> G
>
> I have to take issue with your earlier comments about OPERA being immune 
> to overload. Check out the
> waterfall below. I'm looking for OP8 signals out west (UT and VE7) and 
> WE2XGR/6 running OP4 is
> clearly desensing the OPERA software. Sensitivity can be seen returning to 
> normal between keyed
> characters.
>
> The receiving setup is a 1000' BOG (beverage on ground) > Harris RF-590 
> receiver > Delta 44 sound
> card. Receiver AGC is off and the received signal level is well below that 
> to cause gain compression
> in the receiver. Likewise, the sound card is being operated well below 
> compression/clipping levels.
>
> Weak signals do not decode under these conditions ... same as with WSPR.
>
> Jay W1VD  WD2XNS  WE2XGR/2  WG2XRS/2
>
>
>
>
>