[Lowfer] Note from Markus re modifying opds for any frequency

[Andy - KU4XR]

Thanks for the info Garry... I'll get to work setting up a opds-64 file, and give it a try..
So far I haven't seen any traces that I would say was Bob in QRSS down here in TN.
BUT.. my problem is Receiver sensitivity at this freq. Lots of noise to fight, in essence,
No Antenna to speak of.. But I'm too stubborn to quit.... hi -hi

73:

Andy - KU4XR
--------------------------------------------
On Wed, 3/5/14, Garry Hess <k3siw at sbcglobal.net> wrote:

 Subject: [Lowfer] Note from Markus re modifying opds for any frequency
 To: "lowfer list" <lowfer at mailman.qth.net>
 Date: Wednesday, March 5, 2014, 12:56 AM
 
 Andy,
 
 When 74 kHz opera rate-64 was first being used, I asked
 Markus, DF6NM how to modify the existing rate-32 opds code
 to accommodate it. Turns out it's not that hard to modify
 the code to handle any rate. Here's his response:
 
 <
 you won't need another software version, opds can be
 configured for other speeds. I posted some setup hints on
 blacksheep yesterday, but here's everything in a nutshell:
 
 - SpecLab FFT setup: As the frequency is fixed on 74549.5
 I'm not watching the full 100 Hz but reduced to a narrower
 32k FFT, which keeps data files short and speeds up
 processing ... My settings are for 72 kHz "dial", 
 you'll still have to adapt to your audio center freq,
 samplerate etc.
 
 - Suggested opds.ini edits:
 opspeed=64
 spotdelay=58
 sourcepath=c:\spectrum\data64\  'this was because I'm
 exporting to a separate data64 folder. But you can also use
 the existing data folder.
 pattern=*.txt
 myqth=jn59nj    'enter your 6-digit locator for
 distance calculation
 fc=74550.0   'nominal RF center of FFT
 sr=11999.9988  'your calibrated samplerate (Hz)
 dec=50331648   '96*512k   1536*32k
 fignore=74551
 ignoretol=1.1   ' lets opds ignore clusters
 of local qrm lines higher up on 74.550 and 74.551
 reverseoutput=1  'bottom-to-top
 uploadcmd=cleanup.bat  'can be disabled if you don't
 want to upload and delete
 timetol=2
 - cleanup.bat can stay as is, but you can also do without
 it.
 
 - callsloc.txt has to contain the WG2XRS stations. We
 decided to use WG4XRS etc instead of WG2XRS/4 which isn't
 supported by Opera. Here's mine:
 WG1XRS fn42hi
 WG2XRS fn31ls
 WG3XRS fn42ch
 WG4XRS fn12lq
 WG5XRS em95tg
 That should be it... good luck!
 
 73, Markus (DF6NM)
 >
 
 The frequencies noted above need to be adjusted for
 monitoring 29.499 kHz rather than 74549.5 kHz. Also, you
 need to add WH1XBA fn12lq to callsloc.txt, or something
 similar. It depends on what Bob decides to enter as his call
 in his opera program.
 
 Here's my opds.ini file:
 
 *****
 'opds.ini for opds2h5 64 version
 'df6nm 2013-10-01
 'Opera-64
 
 opspeed=64
 spotdelay=58
 
 sourcepath=C:\Spectrum\data64\
 pattern=*.txt
 
 myqth=en52ta    'enter your 6-digit locator
 
 fc=27950.0     'nominal center for Op-64
 (Hz)
 sr=12000.170   'calibrated samplerate (Hz)
 dec= 50331648   '48*2*512k
 'fignore=74551
 'ignoretol=1.1
 
 'sr=48000       'alternative
 SpecLab samplerate and decimation (Hz)
 'dec=113246208  '216*512k (instead of desired
 196*512k)
 
 'lorangri=8000 6731 7499 'active Loran GRIs in central
 Europe: Russia Lessay Sylt
 'lorantol=0.003 'eliminates Loran lines within +-3 mHz
 
 reverseoutput=1 'bottom-to-top
 
 timetol=2       'assign multiple
 partial detections to same spot (symbol durations)
 
 'lower snr thresholds for slightly more sensitivity:
 'thresholddbcor=14.5 'default 15
 'thresholddbc=5 'default 6
 *****
 
 FFT settings in Spectrum Laboratory are:
 decimate input by 1536
 FFT input size = 32768
 
 Hope that helps.
 -- 73, Garry, K3SIW, EN52ta, Elgin, IL
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