[linrad] Re: Difficulties
Hi Roger, I have always thought that your recordings of the Leonids meteor shower when you were having lots of powerline noise were excellent test objects! I use them for examples here. Oooh! That is a special case with local powerline noise. Linrad can take care of that reasonably well and there is not much I can do to improve with the current structure of Linrad. There are on my website some recordings from July 2003 of 20 14 MHz with lots of powerline noise that totally covered up some weaker stations, that could only be copied after processing with Linrad or Winrad. But you have already worked on these, as did Alberto. I don't have anything tougher than these, although I think they are tougher than Ram's files from the past 2 weeks. But I am looking for other kinds of interference. Did you never have to ask someone to repeat because you could not copy due to interference of other kinds than powerline noise? While recording:-) (Splatter, keying clicks or something else?) I am also interested in marginal SSB. I could add an adaptive filter in SSB mode to try to improve S/N. 73 Leif / SM5BSZ # This message is sent to you because you are subscribed to the mailing list linrad@antennspecialisten.se. To unsubscribe, E-mail to: [EMAIL PROTECTED] To switch to the DIGEST mode, E-mail to [EMAIL PROTECTED] To switch to the INDEX mode, E-mail to [EMAIL PROTECTED] Send administrative queries to [EMAIL PROTECTED]
[linrad] Re: Difficulties
Roger Rehr wrote: I have put short post-processing excerpts from these files on the web though they are not yet referenced in a webpage: 1. without Linrad noise blanking http://www.nitehawk.com/w3sz/no-nb.wav Hi Roger, do you have a longer excerpt of that file, let's say at least 15 seconds or more ? It is shorter than the Linrad processed one (3 sec vs 5 sec) and the recovered audio does not match with that of the processed file, it was captured in a different time segment. I would like to compare the Winrad processing vs Linrad. Thanks 73 Alberto I2PHD # This message is sent to you because you are subscribed to the mailing list linrad@antennspecialisten.se. To unsubscribe, E-mail to: [EMAIL PROTECTED] To switch to the DIGEST mode, E-mail to [EMAIL PROTECTED] To switch to the INDEX mode, E-mail to [EMAIL PROTECTED] Send administrative queries to [EMAIL PROTECTED]
[linrad] Re: Difficulties
Hi, Leif, Answers below ;) Quoting Leif Asbrink [EMAIL PROTECTED]: Hi Roger, I have always thought that your recordings of the Leonids meteor shower when you were having lots of powerline noise were excellent test objects! I use them for examples here. Oooh! That is a special case with local powerline noise. Linrad can take care of that reasonably well and there is not much I can do to improve with the current structure of Linrad. OK. I understand. Others should check these out ;) I wanted to put the link here but I can't find it :( Maybe you can post it? There are on my website some recordings from July 2003 of 20 14 MHz with lots of powerline noise that totally covered up some weaker stations, that could only be copied after processing with Linrad or Winrad. But you have already worked on these, as did Alberto. I don't have anything tougher than these, although I think they are tougher than Ram's files from the past 2 weeks. But I am looking for other kinds of interference. Did you never have to ask someone to repeat because you could not copy due to interference of other kinds than powerline noise? While recording:-) (Splatter, keying clicks or something else?) Yes...many times; but usually during a contest I am too stupid to multitask. So because I am playing with the controls and trying to work the station that I can barely hear, I forget to type 'S and thus never get the data saved. There is another contest this weekend. Maybe there will be lots of noise and I will actually remember to save a file [it could happen] ;) I am also interested in marginal SSB. I could add an adaptive filter in SSB mode to try to improve S/N. OK. I will see what I can find this weekend. There should be lots of splatter to find. Now if I can just remember to record it. I will try putting lots of reminder post-it notes on my monitor screens that say 'its the recording, stupid'. Stay tuned ;) 73, Roger Rehr W3SZ Roger Rehr W3SZ http://www.nitehawk.com/w3sz # This message is sent to you because you are subscribed to the mailing list linrad@antennspecialisten.se. To unsubscribe, E-mail to: [EMAIL PROTECTED] To switch to the DIGEST mode, E-mail to [EMAIL PROTECTED] To switch to the INDEX mode, E-mail to [EMAIL PROTECTED] Send administrative queries to [EMAIL PROTECTED]
[linrad] Re: Difficulties
Hi Alberto, Thanks for the note! Check out the files on the webpage I referenced http://www.nitehawk.com/w3sz/linradnoise.html I think there may be longer versions there. All I did was click the nb on and off, and so the nb audio is of course at slightly different times than the nb-off audio. The webpage files are of substantially longer duration if I recall correctly; I trimmed them down to make shorter excerpts for a presentation that is coming up. All of this is from more than 4 years ago, and so it is possible that there may be files other than what I have on my webpage that I have forgotten about. I think you and Leif have already played with 96 kHz sampling rate wav files from march 2006 that I recorded of the w3ccx beacon with rotor and other noise. These 9 files range in size from 17 to 30 MB. I also have S files of 27 and 71 MB the contents of which are respectively a very weak w3ccx beacon in noise and 144 MHz WSJT EME with some noise, respectively. I saved the latter as a 'noise' file, but in a quick listen it really didn't seem very noisy today ;) Let me know if you want any of those. 73, W3SZ Roger Rehr http://www.nitehawk.com/w3sz Quoting Alberto di Bene [EMAIL PROTECTED]: Roger Rehr wrote: I have put short post-processing excerpts from these files on the web though they are not yet referenced in a webpage: 1. without Linrad noise blanking http://www.nitehawk.com/w3sz/no-nb.wav Hi Roger, do you have a longer excerpt of that file, let's say at least 15 seconds or more ? It is shorter than the Linrad processed one (3 sec vs 5 sec) and the recovered audio does not match with that of the processed file, it was captured in a different time segment. I would like to compare the Winrad processing vs Linrad. Thanks 73 Alberto I2PHD # This message is sent to you because you are subscribed to the mailing list linrad@antennspecialisten.se. To unsubscribe, E-mail to: [EMAIL PROTECTED] To switch to the DIGEST mode, E-mail to [EMAIL PROTECTED] To switch to the INDEX mode, E-mail to [EMAIL PROTECTED] Send administrative queries to [EMAIL PROTECTED] Roger Rehr W3SZ http://www.nitehawk.com/w3sz # This message is sent to you because you are subscribed to the mailing list linrad@antennspecialisten.se. To unsubscribe, E-mail to: [EMAIL PROTECTED] To switch to the DIGEST mode, E-mail to [EMAIL PROTECTED] To switch to the INDEX mode, E-mail to [EMAIL PROTECTED] Send administrative queries to [EMAIL PROTECTED]
[linrad] Re: Difficulties
Hi Roger, I have always thought that your recordings of the Leonids meteor shower when you were having lots of powerline noise were excellent test objects! I use them for examples here. Oooh! That is a special case with local powerline noise. Linrad can take care of that reasonably well and there is not much I can do to improve with the current structure of Linrad. OK. I understand. Others should check these out ;) I wanted to put the link here but I can't find it :( Maybe you can post it? Sure. Look here: http://www.sm5bsz.com/linuxdsp/blanker/leon2001/leon2001.htm http://www.sm5bsz.com/linuxdsp/blanker/leonids.htm I am also interested in marginal SSB. I could add an adaptive filter in SSB mode to try to improve S/N. OK. I will see what I can find this weekend. There should be lots of splatter to find. Now if I can just remember to record it. I will try putting lots of reminder post-it notes on my monitor screens that say 'its the recording, stupid'. Stay tuned ;) OK:-) 73 Leif / SM5BSZ # This message is sent to you because you are subscribed to the mailing list linrad@antennspecialisten.se. To unsubscribe, E-mail to: [EMAIL PROTECTED] To switch to the DIGEST mode, E-mail to [EMAIL PROTECTED] To switch to the INDEX mode, E-mail to [EMAIL PROTECTED] Send administrative queries to [EMAIL PROTECTED]
[linrad] Re: Difficulties
Roger Rehr wrote: Check out the files on the webpage I referenced http://www.nitehawk.com/w3sz/linradnoise.html I think there may be longer versions there. Hi Roger, thanks for the pointer. I checked there, but all the WAV files appear to have been recorded after some sort of bandpass filtering, which stretched the noise pulses, making the effectiveness of the noise blanker almost zero. I think you and Leif have already played with 96 kHz sampling rate wav files from march 2006 that I recorded of the w3ccx beacon with rotor and other noise. These 9 files range in size from 17 to 30 MB. I also have S files of 27 and 71 MB the contents of which are respectively a very weak w3ccx beacon in noise and 144 MHz WSJT EME with some noise, respectively. I saved the latter as a 'noise' file, but in a quick listen it really didn't seem very noisy today ;) Let me know if you want any of those. Yes, I remember that, but was hoping to be able to do some tests with new and different files. If you have a pointer to noisy and unfiltered (broadband) WAV files they are welcome, thanks. 73 Alberto I2PHD # This message is sent to you because you are subscribed to the mailing list linrad@antennspecialisten.se. To unsubscribe, E-mail to: [EMAIL PROTECTED] To switch to the DIGEST mode, E-mail to [EMAIL PROTECTED] To switch to the INDEX mode, E-mail to [EMAIL PROTECTED] Send administrative queries to [EMAIL PROTECTED]
[linrad] Re: Difficulties
Leif Asbrink wrote: Do you have a recording of a signal that you can not quite copy for one reason or another? QRM, QRN, keying clicks or splatter from nearby stations or other problems. Also SSB that can not quite be copied simply because S/N is not good enough would be interesting. Hi Leif, first of all, thanks for your response to my private message about image rejection. It was very useful. About your request, recently there has been an interesting message on the dttsp-linux group, which I attach below. Maybe you could try to process those files with Linrad and see what comes out. The files are compressed with the tool FLAC, and a free decompressor can be found here : http://cyberial.com/flacinstaller.asp When decompressed, they become normal WAV files. 73 Alberto I2PHD --- attached message -- Here are two files that I captured, one last night and one this morning. On the one captured last night you can hear one of the Chinese/Russian Military CW station transmitting on Ham Bands at 7065.5. 1. http://www.zerobeat.in/dttsp/rocky_28_08_2007_2250.flac 2. http://www.zerobeat.in/dttsp/2007-08-29%2002_20_19.flac The band was surprisingly quiet this morning. I will provide more data in the coming days.. 73 Ramakrishnan, VU3RDD # This message is sent to you because you are subscribed to the mailing list linrad@antennspecialisten.se. To unsubscribe, E-mail to: [EMAIL PROTECTED] To switch to the DIGEST mode, E-mail to [EMAIL PROTECTED] To switch to the INDEX mode, E-mail to [EMAIL PROTECTED] Send administrative queries to [EMAIL PROTECTED]
[linrad] Re: Difficulties
Leif, I have always thought that your recordings of the Leonids meteor shower when you were having lots of powerline noise were excellent test objects! I use them for examples here. There are on my website some recordings from July 2003 of 20 14 MHz with lots of powerline noise that totally covered up some weaker stations, that could only be copied after processing with Linrad or Winrad. But you have already worked on these, as did Alberto. I don't have anything tougher than these, although I think they are tougher than Ram's files from the past 2 weeks. The stuff is at: http://www.nitehawk.com/w3sz/linradnoise.html I have put short post-processing excerpts from these files on the web though they are not yet referenced in a webpage: 1. without Linrad noise blanking http://www.nitehawk.com/w3sz/no-nb.wav 2. with Linrad noise blanking http://www.nitehawk.com/w3sz/both-nb-on.wav That way those who can't play around with Linrad can hear its benefits. 73, W3SZ Roger Rehr http://www.nitehawk.com/w3sz Quoting Leif Asbrink [EMAIL PROTECTED]: hello Alberto and Roger, About your request, recently there has been an interesting message on the dttsp-linux group, which I attach below. Maybe you could try to process those files with Linrad and see what comes out. The files are compressed with the tool FLAC, and a free decompressor can be found here : http://cyberial.com/flacinstaller.asp When decompressed, they become normal WAV files. I am looking for difficulties. Sure the second file is difficult because I do not understand the language used in the SSB transmission The first file is easy copy - or would be if the CW was a little slower - my ability to copy high speed is not very good. I would be interested in a recording where someone has had real difficulties to copy when using his best tools:-) 73 Leif / SM5BSZ Roger Rehr W3SZ http://www.nitehawk.com/w3sz # This message is sent to you because you are subscribed to the mailing list linrad@antennspecialisten.se. To unsubscribe, E-mail to: [EMAIL PROTECTED] To switch to the DIGEST mode, E-mail to [EMAIL PROTECTED] To switch to the INDEX mode, E-mail to [EMAIL PROTECTED] Send administrative queries to [EMAIL PROTECTED]
