Thank you all for the input on this. I didn't realize that the
fragmentationlevel can exeed when the buffer file is full in 'sparse' mode. It's
a feature in eMule here, but in that case when a file is completed, it's
completed though. I noticed that the hdd of the measurement pc here got a
fragmentationlevel of 40% over time, but I guess that the only solution for that
is to do some more regular maintenance at this point.
Kind regards, Marc

--- In SpectrumLabUsers@yahoogroups.com, wolf_dl4yhf <dl4yhf@...> wrote:
>
> Hello Marc,
>
> I have no idea how to instruct the file system to treat a file as
> 'sparse' when creating it.
>  From the few bits and pieces I read in wikipedia about sparse files, I
> also don't think its really appropriate here: The big advantage with
> sparse files is if a large portion of them contains zeroes, which are
> actually not written to the file. This is definitely not the file when
> storing FFTs (with floating point numbers) in spectrum labs buffer file.
> Sooner or later there will be no such gaps at all, and 'sparse' files
> (as I understand them to work) will actually cause *MORE* fragmentation
> than if the file was allocated as a single large block, physically.
>
> But again, I am not an expert in the NTFS file system so maybe someone
> around here has more details.
>
> All the best,
>     Wolf .
>
>
>
> Am 15.02.2013 11:03, schrieb muzieklampje:
> >
> > Dear Wolf. Would it be possible to add a 'saving as sparse' (only for
> > ntfs file system) option for the buffer file so the harddisk get less
> > fragmented?
> > With kind regards, Marc, The Netherlands.
> >
> >
>

Hi Wolf,

I was the one with the B26 droputs. Well, I upgraded my laptop to an HP 6930p
with the T9600 processor (2.8Ghz dual core with 1066 FSB and 6MB cache). It has
192Khz built in audio so I thought I would try the softrock SDR with that. I am
using 2.78 B30 SpectrumLab. During normal operation, the 192Khz seems to work
pretty well. I hear an occasional audio pop but it is not a problem. When I
record the I/Q signal at 192Khz and then try to play it back, The playback seems
to run at a crazy jerky speed with continous waterfall and audio droputs. At
96Khz the playback is pretty good. I have uploaded my settings files in the file
area in the folder TonyC/192Khz. I tried to upload a 35MB audio sample but Yahoo
would have none of that. I ended up uploading it to my mediafire accout here:

http://www.mediafire.com/download.php?8h3bqv2q9c4abge

The new laptop got around most of the issues I was having with dropouts (I still
see one every once in a while), even at 192Khz with 65536 FFTs.
I just can't play back the 192Khz recordings unless I disable the sound playback
and only use the waterfall.

Regards,

Tony Casorso

Je suis absent jusqu'au 25/2 au matin - je vous recontacte à mon retour - merci
de votre patience !
I am off until 25th in the morning - I will contact you next monday - thanks for
patience

Meilleures Salutations - Kind Regards

Jean Marie POLARD
gérant


Kermaz sarl
Z.A. de Goasmeur
5, chemin du Grand Pré
22500 Paimpol (France)

Je suis absent jusqu'au 25/2 au matin - je vous recontacte à mon retour - merci
de votre patience !
I am off until 25th in the morning - I will contact you next monday - thanks for
patience

Meilleures Salutations - Kind Regards

Jean Marie POLARD
gérant


Kermaz sarl
Z.A. de Goasmeur
5, chemin du Grand Pré
22500 Paimpol (France)

Je suis absent jusqu'au 25/2 au matin - je vous recontacte à mon retour - merci
de votre patience !
I am off until 25th in the morning - I will contact you next monday - thanks for
patience

Meilleures Salutations - Kind Regards

Jean Marie POLARD
gérant


Kermaz sarl
Z.A. de Goasmeur
5, chemin du Grand Pré
22500 Paimpol (France)

Je suis absent jusqu'au 25/2 au matin - je vous recontacte à mon retour - merci
de votre patience !
I am off until 25th in the morning - I will contact you next monday - thanks for
patience

Meilleures Salutations - Kind Regards

Jean Marie POLARD
gérant


Kermaz sarl
Z.A. de Goasmeur
5, chemin du Grand Pré
22500 Paimpol (France)

Je suis absent jusqu'au 25/2 au matin - je vous recontacte à mon retour - merci
de votre patience !
I am off until 25th in the morning - I will contact you next monday - thanks for
patience

Meilleures Salutations - Kind Regards

Jean Marie POLARD
gérant


Kermaz sarl
Z.A. de Goasmeur
5, chemin du Grand Pré
22500 Paimpol (France)

Je suis absent jusqu'au 25/2 au matin - je vous recontacte à mon retour - merci
de votre patience !
I am off until 25th in the morning - I will contact you next monday - thanks for
patience

Meilleures Salutations - Kind Regards

Jean Marie POLARD
gérant


Kermaz sarl
Z.A. de Goasmeur
5, chemin du Grand Pré
22500 Paimpol (France)

Je suis absent jusqu'au 25/2 au matin - je vous recontacte à mon retour - merci
de votre patience !
I am off until 25th in the morning - I will contact you next monday - thanks for
patience

Meilleures Salutations - Kind Regards

Jean Marie POLARD
gérant


Kermaz sarl
Z.A. de Goasmeur
5, chemin du Grand Pré
22500 Paimpol (France)

Je suis absent jusqu'au 25/2 au matin - je vous recontacte à mon retour - merci
de votre patience !
I am off until 25th in the morning - I will contact you next monday - thanks for
patience

Meilleures Salutations - Kind Regards

Jean Marie POLARD
gérant


Kermaz sarl
Z.A. de Goasmeur
5, chemin du Grand Pré
22500 Paimpol (France)

Je suis absent jusqu'au 25/2 au matin - je vous recontacte à mon retour - merci
de votre patience !
I am off until 25th in the morning - I will contact you next monday - thanks for
patience

Meilleures Salutations - Kind Regards

Jean Marie POLARD
gérant


Kermaz sarl
Z.A. de Goasmeur
5, chemin du Grand Pré
22500 Paimpol (France)

Je suis absent jusqu'au 25/2 au matin - je vous recontacte à mon retour - merci
de votre patience !
I am off until 25th in the morning - I will contact you next monday - thanks for
patience

Meilleures Salutations - Kind Regards

Jean Marie POLARD
gérant


Kermaz sarl
Z.A. de Goasmeur
5, chemin du Grand Pré
22500 Paimpol (France)

Hi Mark,

Like I said in my original post, 192Khz works fine "live". With the radio on and
Spectrumlab running at 192Khz with the waterfall and the audio DSP running it
only has an occasion click in the speaker. The problem is when I play back a
192Khz recorded file. Since the audio system is the same in both instances, I
guess I don't see why it would be the culprit.

Tony

--- In SpectrumLabUsers@yahoogroups.com, Mark McCarron <mark.mccarron@...>
wrote:
>
> Tony,
>
> I don't think this is an issue with SpectrumLab.  On a laptop the audio is
provided by a chipset and the performance is not great.  Most of the functions
are emulated in software by the driver, rather than being hardware based.  Thus,
under high CPU use the audio will drop out.
>
> My recommendation would be to use a desktop machine and invest in an ASUS
Xonar Essence ST audio card.  You will then be able to use any SDR with a
dynamic range up to 120dB.
>
> Regards,
>
> Mark McCarron
>
> To: SpectrumLabUsers@yahoogroups.com
> From: canthony15@...
> Date: Sun, 24 Feb 2013 01:08:39 +0000
> Subject: [SpectrumLabUsers] 192Khz playback problem
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>       Hi Wolf,
>
>
>
> I was the one with the B26 droputs. Well, I upgraded my laptop to an HP 6930p
with the T9600 processor (2.8Ghz dual core with 1066 FSB and 6MB cache). It has
192Khz built in audio so I thought I would try the softrock SDR with that. I am
using 2.78 B30 SpectrumLab. During normal operation, the 192Khz seems to work
pretty well. I hear an occasional audio pop but it is not a problem. When I
record the I/Q signal at 192Khz and then try to play it back, The playback seems
to run at a crazy jerky speed with continous waterfall and audio droputs. At
96Khz the playback is pretty good. I have uploaded my settings files in the file
area in the folder TonyC/192Khz. I tried to upload a 35MB audio sample but Yahoo
would have none of that. I ended up uploading it to my mediafire accout here:
>
>
>
> http://www.mediafire.com/download.php?8h3bqv2q9c4abge
>
>
>
> The new laptop got around most of the issues I was having with dropouts (I
still see one every once in a while), even at 192Khz with 65536 FFTs.
>
> I just can't play back the 192Khz recordings unless I disable the sound
playback and only use the waterfall.
>
>
>
> Regards,
>
>
>
> Tony Casorso
>

Hello

I have read that spectrumlab can decode DGPS signal.

Just basic question. Is there possibility / software
which uses this data and original GPS data and then makes
DGPS receiver making possible to have exact position ?

Br Esko Petäjä
OH6MQM

 

Hello

I have read that spectrumlab can decode DGPS signal.

Just basic question. Is there possibility / software
which uses this data and original GPS data and then makes
DGPS receiver making possible to have exact position ?

Br Esko Petäjä
OH6MQM

 

Hi Mark,

Like I said in my original post, 192Khz works fine "live". With the radio on and Spectrumlab running at 192Khz with the waterfall and the audio DSP running it only has an occasion click in the speaker. The problem is when I play back a 192Khz recorded file. Since the audio system is the same in both instances, I guess I don't see why it would be the culprit.

Tony

--- In SpectrumLabUsers@yahoogroups.com, Mark McCarron wrote:
>
> Tony,
>
> I don't think this is an issue with SpectrumLab. On a laptop the audio is provided by a chipset and the performance is not great. Most of the functions are emulated in software by the driver, rather than being hardware based. Thus, under high CPU use the audio will drop out.
>
> My recommendation would be to use a desktop machine and invest in an ASUS Xonar Essence ST audio card. You will then be able to use any SDR with a dynamic range up to 120dB.
>
> Regards,
>
> Mark McCarron
>
> To: SpectrumLabUsers@yahoogroups.com
> From: canthony15@...
> Date: Sun, 24 Feb 2013 01:08:39 +0000
> Subject: [SpectrumLabUsers] 192Khz playback problem
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
> Hi Wolf,
>
>
>
> I was the one with the B26 droputs. Well, I upgraded my laptop to an HP 6930p with the T9600 processor (2.8Ghz dual core with 1066 FSB and 6MB cache). It has 192Khz built in audio so I thought I would try the softrock SDR with that. I am using 2.78 B30 SpectrumLab. During normal operation, the 192Khz seems to work pretty well. I hear an occasional audio pop but it is not a problem. When I record the I/Q signal at 192Khz and then try to play it back, The playback seems to run at a crazy jerky speed with continous waterfall and audio droputs. At 96Khz the playback is pretty good. I have uploaded my settings files in the file area in the folder TonyC/192Khz. I tried to upload a 35MB audio sample but Yahoo would have none of that. I ended up uploading it to my mediafire accout here:
>
>
>
> http://www.mediafire.com/download.php?8h3bqv2q9c4abge
>
>
>
> The new laptop got around most of the issues I was having with dropouts (I still see one every once in a while), even at 192Khz with 65536 FFTs.
>
> I just can't play back the 192Khz recordings unless I disable the sound playback and only use the waterfall.
>
>
>
> Regards,
>
>
>
> Tony Casorso
>

> ... software which uses this data and _original_GPS_data_ and [] DGPS
receiver [corrections] making possible exact position?

Strictly speaking, yes.  The important term is "original GPS data" which
is, prinicipally, the pseudoranges to each satellite used in the
position solution - which most consumer GPS receivers do not provide.

If, however, you  have access to a GPS receiver that provides
pseudorange and, even better, carrier phase data, software can
post-process that data along with DGPS Type 1, 2 or 9 message
pseudorange delta corrections to achieve high position accuracy.

Tom

I was going to try and save some CPU load by shifting and decimating the input
using the preprocessor block. I have the spectrum analyzer block connected at
L1,R1 (stereo I/Q mode). When I enable the frequency shift in the preprocessor
and enter a shift amount, I see no change on the spectrum analyzer. I tried
moving to L3,R3 and I get the same result. Am I missing something or does this
not work with stereo mode?

Thanks,

Tony

I should mention that I also enabled decimation by 2.

--- In SpectrumLabUsers@yahoogroups.com, "mux_folder2001" <canthony15@...>
wrote:
>
> I was going to try and save some CPU load by shifting and decimating the input
using the preprocessor block. I have the spectrum analyzer block connected at
L1,R1 (stereo I/Q mode). When I enable the frequency shift in the preprocessor
and enter a shift amount, I see no change on the spectrum analyzer. I tried
moving to L3,R3 and I get the same result. Am I missing something or does this
not work with stereo mode?
>
> Thanks,
>
> Tony
>

 

Wolf,

I am generating a 10KHz signal (sine wave) from a frequency generator and pushing it to an antenna.  I can see the received signal on the waterfall in Spectrumlab.  I then show the filter passbands and setup the filter only to include the bandwidth of the received 10KHz signal.

I bring up the Time domain scope and and select L4=Left Filter.  There are no other input channels.  Looking at the oscilloscope output, I observe a straight line, rather than the sine wave of the received 10KHz signal.  I have tried zooming in, but I observe no change in the oscilloscope output.

Am I doing something wrong?

Regards,

Mark McCarron

Hi Wolf,

I have been trying to find some settings that help this problem. I find that
going back to 2.75 B09 seems to eliminate all issues with 192Khz.

Tony

--- In SpectrumLabUsers@yahoogroups.com, wolf_dl4yhf <dl4yhf@...> wrote:
>
> I also think this is an issue with buffer sizes, and the way SL did
> synchronize the waterfall display.
> When time permits, I will try to reproduce the problem (I already
> dowloaded the test file, and it also 'misbehaves' here, on a PC with a
> soundcard that definitely does *not* support 192 kHz sampling, neither
> for input nor for output). At the moment, I am too busy from office work
> and other stuff, so this may take some time - similar as for other
> topics which have recently been asked here.
>
> Cheers,
>     Wolf .
>
> Am 24.02.2013 17:16, schrieb mux_folder2001:
> >
> > Hi Mark,
> >
> > Like I said in my original post, 192Khz works fine "live". With the
> > radio on and Spectrumlab running at 192Khz with the waterfall and the
> > audio DSP running it only has an occasion click in the speaker. The
> > problem is when I play back a 192Khz recorded file. Since the audio
> > system is the same in both instances, I guess I don't see why it would
> > be the culprit.
> >
> > Tony
> >
> > --- In SpectrumLabUsers@yahoogroups.com
> > <mailto:SpectrumLabUsers%40yahoogroups.com>, Mark McCarron wrote:
> > >
> > > Tony,
> > >
> > > I don't think this is an issue with SpectrumLab. On a laptop the
> > audio is provided by a chipset and the performance is not great. Most
> > of the functions are emulated in software by the driver, rather than
> > being hardware based. Thus, under high CPU use the audio will drop out.
> > >
> > > My recommendation would be to use a desktop machine and invest in an
> > ASUS Xonar Essence ST audio card. You will then be able to use any SDR
> > with a dynamic range up to 120dB.
> > >
> > > Regards,
> > >
> > > Mark McCarron
> > >
> > > To: SpectrumLabUsers@yahoogroups.com
> > <mailto:SpectrumLabUsers%40yahoogroups.com>
> > > From: canthony15@
> > > Date: Sun, 24 Feb 2013 01:08:39 +0000
> > > Subject: [SpectrumLabUsers] 192Khz playback problem
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > > Hi Wolf,
> > >
> > >
> > >
> > > I was the one with the B26 droputs. Well, I upgraded my laptop to an
> > HP 6930p with the T9600 processor (2.8Ghz dual core with 1066 FSB and
> > 6MB cache). It has 192Khz built in audio so I thought I would try the
> > softrock SDR with that. I am using 2.78 B30 SpectrumLab. During normal
> > operation, the 192Khz seems to work pretty well. I hear an occasional
> > audio pop but it is not a problem. When I record the I/Q signal at
> > 192Khz and then try to play it back, The playback seems to run at a
> > crazy jerky speed with continous waterfall and audio droputs. At 96Khz
> > the playback is pretty good. I have uploaded my settings files in the
> > file area in the folder TonyC/192Khz. I tried to upload a 35MB audio
> > sample but Yahoo would have none of that. I ended up uploading it to
> > my mediafire accout here:
> > >
> > >
> > >
> > > http://www.mediafire.com/download.php?8h3bqv2q9c4abge
> > >
> > >
> > >
> > > The new laptop got around most of the issues I was having with
> > dropouts (I still see one every once in a while), even at 192Khz with
> > 65536 FFTs.
> > >
> > > I just can't play back the 192Khz recordings unless I disable the
> > sound playback and only use the waterfall.
> > >
> > >
> > >
> > > Regards,
> > >
> > >
> > >
> > > Tony Casorso
> > >
> >
> >
>

 

Wolf,

The signal is about -100dB.  Is there anyway to get a non-liner scale, or increase the scale of the amplitude???

Regards,

Mark McCarron

---

To: SpectrumLabUsers@yahoogroups.com
From: dl4yhf@...
Date: Fri, 1 Mar 2013 14:06:57 +0100
Subject: Re: [SpectrumLabUsers] Time Domain view of a signal

 

Possibly the amplitude too low ? If the signal on the spectrogram is, for example, 90 dB below "full scale" you will hardly see it on the scope, with its linear scaling.

Cheers,
  Wolf

(too little time to test this myself. too busy from other projects ... maybe later..)

Am 28.02.2013 21:03, schrieb Mark McCarron:

 

Wolf,

I am generating a 10KHz signal (sine wave) from a frequency generator and pushing it to an antenna.  I can see the received signal on the waterfall in Spectrumlab.  I then show the filter passbands and setup the filter only to include the bandwidth of the received 10KHz signal.

I bring up the Time domain scope and and select L4=Left Filter.  There are no other input channels.  Looking at the oscilloscope output, I observe a straight line, rather than the sine wave of the received 10KHz signal.  I have tried zooming in, but I observe no change in the oscilloscope output.

Am I doing something wrong?

Regards,

Mark McCarron

For optical SETI I am looking at very low frequencies from 0.01 to 2
Hz.  Calculations suggest that fewer than 1 in 10 transmitted pulses
might be detectable.  Thus, I need to accumulate data over several hours
and then analyze that data for periodic pulses.  The "spectrum.save()"
command works fine, but I don't need to save the bins at frequencies
greater than 2 Hz.  Can anyone suggest how to truncate the data such
that only those bins are saved?

Best from Ben
KG4LRA
Panama

On Wed, 06 Mar 2013 06:41:29 -0800, M. Ben Schuetz <kg4lra@...>
wrote:

> For optical SETI I am looking at very low frequencies from 0.01 to 2
> Hz.  Calculations suggest that fewer than 1 in 10 transmitted pulses
> might be detectable.  Thus, I need to accumulate data over several hours
> and then analyze that data for periodic pulses.  The "spectrum.save()"
> command works fine, but I don't need to save the bins at frequencies
> greater than 2 Hz.  Can anyone suggest how to truncate the data such
> that only those bins are saved?
>
> Best from Ben
> KG4LRA
> Panama


Hi Ben

It seems you are familiar with SpecLab, so hopefully this is useful. I use
the waterfall screen as a calculator to find the start frequency and
number of bins to save by setting the width to what I want to have saved
in the FFT Export function.
   This can be on a button, but I use it from the conditional actions, and
display the variables on a button.
   If you want to save 2 Hz of bins, set the screen width to 2 Hz, and the
start freq and number of bins are displayed. Enter these numbers in the
FFT Export window.

IF13=always
THEN13=binwidth=cfg.NominalAudioSR
/(cfg.FFTSize*cfg.FFTInputDec):bins=((water.f_max-water.f_min)/binwidth):startfr\
eq=water.f_min

This works by finding the width of one bin

binwidth=cfg.NominalAudioSR /(cfg.FFTSize*cfg.FFTInputDec)

then, with binwidth we can find how many bins are displayed on the
waterfall

bins=((water.f_max-water.f_min)/binwidth)

and start freq is just the lowest frequency

startfreq=water.f_min

This is not automatic, but is the easiest method I have found. Once the
numbers are entered, you may reset the waterfall to display whatever you
like.

This is not spectrum save. It is FFT export.

Mike

Thanks Mike,  I'll work on that later today and let you know how it goes.

Ben


On 3/6/2013 11:16 AM, kd7ts wrote:
> On Wed, 06 Mar 2013 06:41:29 -0800, M. Ben Schuetz <kg4lra@...>
> wrote:
>
>> For optical SETI I am looking at very low frequencies from 0.01 to 2
>> Hz.  Calculations suggest that fewer than 1 in 10 transmitted pulses
>> might be detectable.  Thus, I need to accumulate data over several hours
>> and then analyze that data for periodic pulses.  The "spectrum.save()"
>> command works fine, but I don't need to save the bins at frequencies
>> greater than 2 Hz.  Can anyone suggest how to truncate the data such
>> that only those bins are saved?
>>
>> Best from Ben
>> KG4LRA
>> Panama
>
> Hi Ben
>
> It seems you are familiar with SpecLab, so hopefully this is useful. I use
> the waterfall screen as a calculator to find the start frequency and
> number of bins to save by setting the width to what I want to have saved
> in the FFT Export function.
>    This can be on a button, but I use it from the conditional actions, and
> display the variables on a button.
>    If you want to save 2 Hz of bins, set the screen width to 2 Hz, and the
> start freq and number of bins are displayed. Enter these numbers in the
> FFT Export window.
>
> IF13=always
> THEN13=binwidth=cfg.NominalAudioSR
>
/(cfg.FFTSize*cfg.FFTInputDec):bins=((water.f_max-water.f_min)/binwidth):startfr\
eq=water.f_min
>
> This works by finding the width of one bin
>
> binwidth=cfg.NominalAudioSR /(cfg.FFTSize*cfg.FFTInputDec)
>
> then, with binwidth we can find how many bins are displayed on the
> waterfall
>
> bins=((water.f_max-water.f_min)/binwidth)
>
> and start freq is just the lowest frequency
>
> startfreq=water.f_min
>
> This is not automatic, but is the easiest method I have found. Once the
> numbers are entered, you may reset the waterfall to display whatever you
> like.
>
> This is not spectrum save. It is FFT export.
>
> Mike
>
>
> ------------------------------------
>
> Yahoo! Groups Links
>
>
>