[Lowfer] 136 KHz Opera

[Jay Hainline]

Yes got several decodes from VO1NA last night. I was seeing his signal 
easily with Spectrum Lab also running.

It's too bad the author of the program has some "issues".

73 Jay KA9CFD

-----Original Message----- 
From: Garry Hess
Sent: Wednesday, January 7, 2015 6:49 AM
To: lowfer list
Subject: Re: [Lowfer] 136 KHz Opera

Jay, thanks for pointing out the opera32 activity on 136 kHz last night.
Also, that the newest version of opera software has a "deep search"
feature. I saw no reason to update until that information.

Got on too late to decode anyone other than VO1NA. No instruction was
included as to how to fill the dynamic call list but apparently it's
automatic. Once I decoded VO1NA I found it entered, as were a number of
other callsigns (apparently because they reported activity through the
internet). I suppose one could go to the Yahoo opera group to answer
questions about operation but I don't choose to do that.

Along with the install package I did notice a .pdf file of "propaganda"
citing how useless the original DF6NM deep search was compared to the
new dynamic opera deep search. I can't imagine what the author did to
get so many falses in the comparison. Out of the hundreds of decodes
I've had since Markus shared his code I've had one false. I do recall
there was a SNR difference between Markus's code and earlier versions of
opera. That's probably because of differences in what is taken as the
noise bandwidth. But it's not really important. What is important is
reliable decodes and Markus's code gives that for me.

Here's what I got last night from opera 1.5.5:

10:28    136 VO1NA Op32 -36 dB  |----------------------------| Fade: 16%
09:53    136 VO1NA Op32 -39 dB  |----------------------------| Fade: 8%
09:18    136 VO1NA Op32 -36 dB  |----------------------------| Fade: 28%
08:43    136 VO1NA Op32 -33 dB  |----------------------------| Fade: 6%
08:08    136 VO1NA Op32 -26 dB  |----------------------------| Fade: 3%
07:33    136 VO1NA Op32 -29 dB  |----------------------------| Fade: 2%
06:58    136 VO1NA Op32 -35 dB  |----------------------------| Fade: 44%
***********  07/01/2015  ***********

My deep search DF6NM software was started later and gave:

2015-01-07 10:28:06 VO1NA   2836km 137526.996Hz  10mHz -41.8dBOp  81% 18.1dB
2015-01-07 09:18:04 VO1NA   2836km 137526.994Hz   3mHz -37.7dBOp  95% 17.1dB
2015-01-07 08:43:04 VO1NA   2836km 137526.994Hz   4mHz -42.1dBOp  96% 18.6dB
2015-01-07 08:08:03 VO1NA   2836km 137526.996Hz   5mHz -32.6dBOp  95% 19.5dB

Sorry the frequencies are 50 Hz high because I forgot to recode the
center frequency as 137500 instead of 137550 in opds.ini. Not sure what
happened to the 09:53 decode.

It will be interesting to see how the opera deep search compares with
DF6NM deep search when minimally detectable signals are present.
-- 
73, Garry, K3SIW, EN52ta, Elgin, IL
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