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
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