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Opera got the fu= ll passband (136-138.2 kHz) through SpecLab and VAC without further audio p= rocessing, whereas the other SpecLab instance for opds had a 160 Hz bandpas= s filter, noise blanker and audio AGC inserted before the 0.477 mHz FFT. Th= e QRN background from the southeast was generally lower than the night befo= re. Results for both are in=20 http://df6nm.bplaced.net/opera/Opera_vs_opds_130623-24.txt and a screenshot http://df6nm.bplaced.net/opera/Opera_vs_opds_screenshot_130624.jpg Although SNR results shown by Opera were consistently better than those for= opds, Opera achieved two only decodes while opds produced ten hits (includ= ing three from VO1NA). I am wondering whether this difference may have been exacerbated by the reg= ular splatter from DCF39 which is quite strong in central Europe. This may = also have affected the SNR estimates of either program. Maybe in this situa= tion dedicated preprocessing might be helpful for Opera as well? We may perhaps speculate that possible DCF suppression may be part of the l= oop advantage observed by DF2JP - Joe could you comment on your loop's orie= ntation?=20 Best 73, Markus (DF6NM) =20 From: Markus Vester=20 Sent: Sunday, June 23, 2013 1:25 PM To: rsgb_lf_group@blacksheep.org ; rsgb_lf_group@yahoogroups.co.uk=20 Subject: Re: LF: VO1NA Opera-32 I have downloaded Opera v1.4.7 from the rosmodem website. It was easy to co= nfigure and is running smoothly in conjunction with SpecLab and VAC-3, whic= h is needed here to convert from 135.5 to 136.0 kHz LO. With the waterfall = disabled, average CPU usage on the slow Atom Netbook is an easy 20% from on= e of two virtual CPU's (10% shown in task manager).=20 Opds is running in parallel from a separate SpecLab instance. A locally gen= erated test signal showed up both in Opera (-28 dB) and in opds (-36.4 dB),= which means that the first round goes to Jose ;-) I will let both run for = a while, hoping for some weak signals to compare. Best 73, Markus (DF6NM) ------=_NextPart_000_0004_01CE70C7.580B9540 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable  
=20=20=20=20=20=20 =20=20=20=20=20=20

Last night the EA5HVK Opera decoder an= d my opds=20 correlation detector ran side by side here on one machine, fed by the same= =20 soundcard. Opera got the full passband (136-138.2 kHz) through SpecLab and = VAC=20 without further audio processing, whereas the other SpecLab instance for op= ds=20 had a 160 Hz bandpass filter, noise blanker and audio AGC inserted before t= he=20 0.477 mHz FFT. The QRN background from the southeast was generally lower th= an=20 the night before.
 
 
Although SNR results shown by Opera we= re=20 consistently better than those for opds, Opera achieved two only decodes wh= ile=20 opds produced ten hits (including three from VO1NA).
 
I am wondering whether this difference= may have=20 been exacerbated by the regular splatter from DCF39 which is quite strong i= n=20 central Europe. This may also have affected the SNR estimates of either pro= gram.=20 Maybe in this situation dedicated preprocessing might be helpful for Opera = as=20 well?
 
We may perhaps speculate that possible= DCF=20 suppression may be part of the loop advantage observed by DF2JP - Joe could= you=20 comment on your loop's orientation?
 
Best 73,
Markus (DF6NM)

 
Sent: Sunday, June 23, 2013 1:25 PM
Subject: Re: LF: VO1NA Opera-32

I have downloaded Opera v1.4.7 from th= e rosmodem=20 website. It was easy to configure and is running smoothly in conjunction wi= th=20 SpecLab and VAC-3, which is needed here to convert from 135.5 to 136.0= kHz=20 LO. With the waterfall disabled, average CPU usage on the slow Atom Netbook= =20 is an easy 20% from one of two virtual CPU's (10% shown in task=20 manager).
 
Opds is running in parallel from a sep= arate SpecLab=20 instance. A locally generated t= est signal=20 showed up both in Opera (-28 dB) and in opds (-36.4 dB), which means t= hat=20 the first round goes to Jose ;-) I w= ill let both=20 run for a while, hoping for some weak signals to compare.
 
Best 73,
Markus (DF6NM)
 

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