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## Re: [Discuss-gnuradio] Discuss-gnuradio Digest, Vol 201, Issue 22

 From: John Mikulskis Subject: Re: [Discuss-gnuradio] Discuss-gnuradio Digest, Vol 201, Issue 22 Date: Thu, 18 Jul 2019 17:44:52 -0400

Hello all,

I have created a block to fuzz the preamble of 802.15.4 packets for device fingerprinting and basic pen-testing.

I have two parameters: preamble-min and preamble-max:
• preamble-min is an int vector containing the integer representations of the 5 minimum bytes to fuzz the preamble (Preamble, 4 octets + SFD, 1 octet)
• preamble-max is an int vector containing the integer representations of the 5 maximum bytes to fuzz the preamble with (Preamble, 4 octets + SFD, 1 octet)
After these parameters are passed in, the block will create a preamble with random values between these byte values and add it to 802.15.4 packets passed through a UDP Socket.

The problem that I'm having is that I'm not sure how to pass these parameters through the CLI. I just found out that Gnuradio does not allow you to pass in a NoneType parameter through the CLI, and I don't want to pass in 10 different int values. Is the best fix to this problem to pass the parameter as a string and convert it into an int array in the block, or does anyone know a cleaner way to fix this problem?

Thank you,
John

On Thu, Jul 18, 2019 at 12:00 PM <address@hidden> wrote:
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Today's Topics:

1. Re: USRP GNU radio receiver (Simona Sibio)
2. Re: USRP GNU radio receiver (Simona Sibio)
3. Re: Using PyBOMBS to install gnuradio (Barry Duggan)
4. Re: GNURadio File meta Sink performance. (N. Benes)

----------------------------------------------------------------------

Message: 1
Date: Thu, 18 Jul 2019 12:19:00 +0100
From: Simona Sibio <address@hidden>
To: Jonas Manthey <address@hidden>
Cc: Kyeong Su Shin <address@hidden>,  "address@hidden"
<address@hidden>
Subject: Re: [Discuss-gnuradio] USRP GNU radio receiver
Message-ID:
<address@hidden>
Content-Type: text/plain; charset="utf-8"

Hi Jonas,

Thank you!
I know that I send the signal plus carrer signal.
I wanted only to explain in a simple way my problem.
Best Regards,

Simona

Il giorno gio 18 lug 2019 alle ore 12:11 Jonas Manthey <
address@hidden> ha scritto:

> Hi,
>
>
>
> You don’t send a sine with  frequency 0, you send a carrier that is
> modulated by a sine with a frequency of 0. A sine with a frequency of 0 is
> 0: sin(2 pi f) = sin(2 pi 0) = sin(0) = 0.
>
>
>
> So your carrier is modulated with a zero, which I **think** ends up in no
> carrier at all, not sure right now how zero-IF architectures behave in that
> case. I highly recommend reading some communications or RF
> book/website/guide or talk with your advisor.
>
>
>
> UHD-USRP clips anything above 1 if left in the default setting (float I
> guess) and there will be a lot of garbage in the sent spectrum.
>
>
>
> Cheers,
>
> Jonas
>
>
>
> *From:* Discuss-gnuradio [mailto:discuss-gnuradio-bounces+jonas.manthey=
> address@hidden] *On Behalf Of *Simona Sibio
> *Sent:* Donnerstag, 18. Juli 2019 13:01
> *To:* Kyeong Su Shin <address@hidden>
> *Cc:* address@hidden
> *Subject:* Re: [Discuss-gnuradio] USRP GNU radio receiver
>
>
>
> Hi Kyeong,
>
>
>
> I attached the screenshots about time-domain and frequency domain.
>
> I sent a sine with frequency=0 and amplitude=0,25.
>
> The output is always zero in the receiver.
>
> The situation changes only if I send a sine with a frequency non-zero.
>
> Thank you for your time.
>
> Best Regards,
>
>
>
> Simona
>
>
>
> Il giorno mer 17 lug 2019 alle ore 17:41 Kyeong Su Shin <
> address@hidden> ha scritto:
>
> To whom it may concern:
>
>
>
> I think there has been some miscommunications or misunderstandings here:
> the 'Offset' argument for the 'Signal Source' block is for the 'amplitude
> offset' of the signal, while what Marcus probably meant in his previous
> e-mail is the 'frequency offset' (you can use USRP's low-freq digital IF
> capabilities for that). Also, I do not know how UHD sink behaves when you
> do not input normalized values, but I am pretty sure that you should not
> input such large values to UHD sink.
>
>
>
> If readings in the frequency-domain are non-zero (or, in real-world
> devices, extremely low values), readings in the time-domains are also
> non-zero. So, "the output became unstable in frequency and in time is
> always zero" doesn't make sense. Your time-domain plot is probably zoomed
> out too much.
>
>
>
> Finally, as Marcus mentioned, throttle blocks _must_ be removed.
>
>
>
> Regards,
>
> Kyeong Su Shin
>
>
> ------------------------------
>
> *보낸* *사람**:* Simona Sibio <address@hidden> 대신 Discuss-gnuradio
> <discuss-gnuradio-bounces+ksshin=address@hidden>
> *보낸* *날짜**:* 2019년 7월 17일 수요일 오후 11:35:00
> *받는* *사람**:* Müller, Marcus (CEL)
> *참조**:* address@hidden
> *제목**:* Re: [Discuss-gnuradio] USRP GNU radio receiver
>
>
>
> Thank you very much!
>
> I sent the screenshot because in the oscilloscope there is not the offset.
>
> Instead, I would like to detect that.
>
> Thank you in advance.
>
>
>
> Simona
>
>
>
> Il giorno mer 17 lug 2019 alle ore 15:22 Müller, Marcus (CEL) <
> address@hidden> ha scritto:
>
> 1. Never use a throttle with a hardware block. GRC's log will actually
> shout at you that you shouldn't be doing that!
> 2. I must admit this is about as good as I'd expect. I of course can't
> infer temporal behaviour from screenshots.
>
> Best regards,
> Marcus
>
> On Wed, 2019-07-17 at 14:18 +0100, Simona Sibio wrote:
> > Hi Marcus,
> >
> > I tried to change the offset in the transmitter but the output in the
> receiver is the same, also if I send a sine signal with 10 Hz and 0,1
> amplitude: the output became unstable in frequency and in time is always
> zero (see attached, 130K).
> > The flow graph is attached.
> > Do you have any suggestions?
> > Thank you in advance.
> >
> > Simona
> >
> > Il giorno mar 16 lug 2019 alle ore 18:59 Müller, Marcus (CEL) <
> address@hidden> ha scritto:
> > > That phase is not any more or less random than that of your local
> > > oscillator, so there might be some misunderstanding here.
> > > On Tue, 2019-07-16 at 18:52 +0100, Simona Sibio wrote:
> > > > Thank you very much!
> > > > But, with the offset tuning I cannot edit the phase.
> > > > Maybe, I have to change method.
> > > > Best Regards,
> > > >
> > > > Simona
> > > >
> > > > Il giorno mar 16 lug 2019 alle ore 18:25 Müller, Marcus (CEL) <
> address@hidden> ha scritto:
> > > > > Well, there's leakage / DC blocking filters in most mixers, so
> yes.
> > > > >
> > > > > But the solution is simple (and hardware-supported transparently on
> > > > > USRPs): Just tune at an offset, and mix down to 0 Hz (==constant!)
> in
> > > > > digital. Your USRP can do that for you, google for "USRP offset
> > > > > tuning".
> > > > >
> > > > > Best regards,
> > > > > Marcus
> > > > >
> > > > > On Tue, 2019-07-16 at 18:15 +0100, Simona Sibio wrote:
> > > > > > Thank you very much!!
> > > > > > Then, I cannot measure a constant because, in the RX chain,
> maybe, some filter deletes the information, doesn't it?
> > > > > > Thank you for your time and tour tips!
> > > > > >
> > > > > > Best Regards,
> > > > > >
> > > > > > Simona
> > > > > >
> > > > > > Il giorno mar 16 lug 2019 alle ore 18:01 Müller, Marcus (CEL) <
> address@hidden> ha scritto:
> > > > > > > Look up what a quadrature modulator does. It's just a
> multiplication
> > > > > > > with e^{j2\pi f_{carrier}t}, in the end.
> > > > > > >
> > > > > > > Your constant signal s(t) = c const. would hence be
> transmitted as
> > > > > > >
> > > > > > > c·e^{j2\pi f_{carrier}t}
> > > > > > >
> > > > > > > whereas a complex sinusoid of frequency f and amplitude a,
> > > > > > > s(t) = a·e^{j2\pi f t) would be transmitted as
> > > > > > >
> > > > > > > a·e^{j2\pi f t)·e^{j2\pi f_{carrier}t} = a·e^{j2\pi
> (f+f_{carrier})t}
> > > > > > >
> > > > > > > so, identical to the constant signal, just at a different
> frequency.
> > > > > > >
> > > > > > >
> > > > > > > Best regards,
> > > > > > > Marcus
> > > > > > >
> > > > > > > On Tue, 2019-07-16 at 17:53 +0100, Simona Sibio wrote:
> > > > > > > > Hi Marcus,
> > > > > > > >
> > > > > > > > Thank you for tip!
> > > > > > > > I know that calibration is not so easy but I hope that.
> > > > > > > > Could you help me to understand what happened with a
> constant complex baseband signal?
> > > > > > > > I am beginner in this field.
> > > > > > > > Thank you for your time.
> > > > > > > >
> > > > > > > > Best Regards,
> > > > > > > >
> > > > > > > > Simona
> > > > > > > >
> > > > > > > > Il giorno mar 16 lug 2019 alle ore 17:39 Müller, Marcus
> (CEL) <address@hidden> ha scritto:
> > > > > > > > > Watch out! What do you get at the *output* of your SDR
> device when you
> > > > > > > > > transmit a constant complex baseband signal, mixed to a
> carrier
> > > > > > > > > frequency? How does that differ from transmitting a
> complex baseband
> > > > > > > > > sinusoid mixed to a carrier frequency?
> > > > > > > > >
> > > > > > > > > On Tue, 2019-07-16 at 18:32 +0200, sumit kumar wrote:
> > > > > > > > > > Ok, so for a constant source, in the time domain you
> will see a flat signal only! Try connecting a spectrum analyzer and you
> shud see a peak at DC becz Fourier transform of constant signal is impulse.
> > > > > > > > > > And yes, as Marcus said, increase the sampling rate!
> > > > > > > > > >
> > > > > > > > > >
> > > > > > > > > > On Tue, 16 Jul 2019 at 18:06, Simona Sibio <
> address@hidden> wrote:
> > > > > > > > > > > Thank you for the assistance.
> > > > > > > > > > >
> > > > > > > > > > > I put the module "constant source" in my flow grap.
> > > > > > > > > > > With this module, I can choose witch amplitude I want
> to send.
> > > > > > > > > > > I attached the flow graph.
> > > > > > > > > > > And, I would want to read these values in the receiver.
> > > > > > > > > > >
> > > > > > > > > > > Simona
> > > > > > > > > > >
> > > > > > > > > > > Il giorno mar 16 lug 2019 alle ore 16:58 sumit kumar <
> address@hidden> ha scritto:
> > > > > > > > > > > > Hi Simona, what is the "constant signal" here ?
> > > > > > > > > > > >
> > > > > > > > > > > > On Tue, 16 Jul 2019 at 17:54, Simona Sibio <
> address@hidden> wrote:
> > > > > > > > > > > > > Hi all,
> > > > > > > > > > > > >
> > > > > > > > > > > > > I want to use GNU radio to measure the amplitude
> and the phase of a signal.
> > > > > > > > > > > > > I send a constant signal with the transmitter USRP
> but in the receiver there is a flat signal with amplitude 0 and offset 0.
> > > > > > > > > > > > > I tried to send a sine signal and the receveir
> works fine.
> > > > > > > > > > > > > How can I do to send only a constant and measure
> the amplitude?
> > > > > > > > > > > > >
> > > > > > > > > > > > > Thank you for your time.
> > > > > > > > > > > > >
> > > > > > > > > > > > > Simona
> > > > > > > > > > > > >
> > > > > > > > > > > > > _______________________________________________
> > > > > > > > > > > > > Discuss-gnuradio mailing list
> > > > > > > > > > > > > address@hidden
> > > > > > > > > > > > >
> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
> > > > > > > > > > > >
> > > > > > > > > > > >
> > > > > > > > > > > > --
> > > > > > > > > > > > Sumit Kumar
> > > > > > > > > > > >
> > > > > > > > > > > >
> > > > > > > > > >
> > > > > > > > > >
> > > > > > > > > > _______________________________________________
> > > > > > > > > > Discuss-gnuradio mailing list
> > > > > > > > > > address@hidden
> > > > > > > > > > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
>
>
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------------------------------

Message: 2
Date: Thu, 18 Jul 2019 12:28:31 +0100
From: Simona Sibio <address@hidden>
To: Jonas Manthey <address@hidden>
Cc: Kyeong Su Shin <address@hidden>,  "address@hidden"
<address@hidden>
Subject: Re: [Discuss-gnuradio] USRP GNU radio receiver
Message-ID:
<address@hidden>
Content-Type: text/plain; charset="utf-8"

Hi all,

Thank you very much for your emails.
But no tip works fine.
I wanted only to learn how is USRP working with GNU radio, I thought that
the RX chain in the USRP was different.
But I am not the beginner in electronic and RF circuits.
Anyway, no problem, I don't ask more information about this.
Best Regards,

Simona

Il giorno gio 18 lug 2019 alle ore 12:11 Jonas Manthey <
address@hidden> ha scritto:

> Hi,
>
>
>
> You don’t send a sine with  frequency 0, you send a carrier that is
> modulated by a sine with a frequency of 0. A sine with a frequency of 0 is
> 0: sin(2 pi f) = sin(2 pi 0) = sin(0) = 0.
>
>
>
> So your carrier is modulated with a zero, which I **think** ends up in no
> carrier at all, not sure right now how zero-IF architectures behave in that
> case. I highly recommend reading some communications or RF
> book/website/guide or talk with your advisor.
>
>
>
> UHD-USRP clips anything above 1 if left in the default setting (float I
> guess) and there will be a lot of garbage in the sent spectrum.
>
>
>
> Cheers,
>
> Jonas
>
>
>
> *From:* Discuss-gnuradio [mailto:discuss-gnuradio-bounces+jonas.manthey=
> address@hidden] *On Behalf Of *Simona Sibio
> *Sent:* Donnerstag, 18. Juli 2019 13:01
> *To:* Kyeong Su Shin <address@hidden>
> *Cc:* address@hidden
> *Subject:* Re: [Discuss-gnuradio] USRP GNU radio receiver
>
>
>
> Hi Kyeong,
>
>
>
> I attached the screenshots about time-domain and frequency domain.
>
> I sent a sine with frequency=0 and amplitude=0,25.
>
> The output is always zero in the receiver.
>
> The situation changes only if I send a sine with a frequency non-zero.
>
> Thank you for your time.
>
> Best Regards,
>
>
>
> Simona
>
>
>
> Il giorno mer 17 lug 2019 alle ore 17:41 Kyeong Su Shin <
> address@hidden> ha scritto:
>
> To whom it may concern:
>
>
>
> I think there has been some miscommunications or misunderstandings here:
> the 'Offset' argument for the 'Signal Source' block is for the 'amplitude
> offset' of the signal, while what Marcus probably meant in his previous
> e-mail is the 'frequency offset' (you can use USRP's low-freq digital IF
> capabilities for that). Also, I do not know how UHD sink behaves when you
> do not input normalized values, but I am pretty sure that you should not
> input such large values to UHD sink.
>
>
>
> If readings in the frequency-domain are non-zero (or, in real-world
> devices, extremely low values), readings in the time-domains are also
> non-zero. So, "the output became unstable in frequency and in time is
> always zero" doesn't make sense. Your time-domain plot is probably zoomed
> out too much.
>
>
>
> Finally, as Marcus mentioned, throttle blocks _must_ be removed.
>
>
>
> Regards,
>
> Kyeong Su Shin
>
>
> ------------------------------
>
> *보낸* *사람**:* Simona Sibio <address@hidden> 대신 Discuss-gnuradio
> <discuss-gnuradio-bounces+ksshin=address@hidden>
> *보낸* *날짜**:* 2019년 7월 17일 수요일 오후 11:35:00
> *받는* *사람**:* Müller, Marcus (CEL)
> *참조**:* address@hidden
> *제목**:* Re: [Discuss-gnuradio] USRP GNU radio receiver
>
>
>
> Thank you very much!
>
> I sent the screenshot because in the oscilloscope there is not the offset.
>
> Instead, I would like to detect that.
>
> Thank you in advance.
>
>
>
> Simona
>
>
>
> Il giorno mer 17 lug 2019 alle ore 15:22 Müller, Marcus (CEL) <
> address@hidden> ha scritto:
>
> 1. Never use a throttle with a hardware block. GRC's log will actually
> shout at you that you shouldn't be doing that!
> 2. I must admit this is about as good as I'd expect. I of course can't
> infer temporal behaviour from screenshots.
>
> Best regards,
> Marcus
>
> On Wed, 2019-07-17 at 14:18 +0100, Simona Sibio wrote:
> > Hi Marcus,
> >
> > I tried to change the offset in the transmitter but the output in the
> receiver is the same, also if I send a sine signal with 10 Hz and 0,1
> amplitude: the output became unstable in frequency and in time is always
> zero (see attached, 130K).
> > The flow graph is attached.
> > Do you have any suggestions?
> > Thank you in advance.
> >
> > Simona
> >
> > Il giorno mar 16 lug 2019 alle ore 18:59 Müller, Marcus (CEL) <
> address@hidden> ha scritto:
> > > That phase is not any more or less random than that of your local
> > > oscillator, so there might be some misunderstanding here.
> > > On Tue, 2019-07-16 at 18:52 +0100, Simona Sibio wrote:
> > > > Thank you very much!
> > > > But, with the offset tuning I cannot edit the phase.
> > > > Maybe, I have to change method.
> > > > Best Regards,
> > > >
> > > > Simona
> > > >
> > > > Il giorno mar 16 lug 2019 alle ore 18:25 Müller, Marcus (CEL) <
> address@hidden> ha scritto:
> > > > > Well, there's leakage / DC blocking filters in most mixers, so
> yes.
> > > > >
> > > > > But the solution is simple (and hardware-supported transparently on
> > > > > USRPs): Just tune at an offset, and mix down to 0 Hz (==constant!)
> in
> > > > > digital. Your USRP can do that for you, google for "USRP offset
> > > > > tuning".
> > > > >
> > > > > Best regards,
> > > > > Marcus
> > > > >
> > > > > On Tue, 2019-07-16 at 18:15 +0100, Simona Sibio wrote:
> > > > > > Thank you very much!!
> > > > > > Then, I cannot measure a constant because, in the RX chain,
> maybe, some filter deletes the information, doesn't it?
> > > > > > Thank you for your time and tour tips!
> > > > > >
> > > > > > Best Regards,
> > > > > >
> > > > > > Simona
> > > > > >
> > > > > > Il giorno mar 16 lug 2019 alle ore 18:01 Müller, Marcus (CEL) <
> address@hidden> ha scritto:
> > > > > > > Look up what a quadrature modulator does. It's just a
> multiplication
> > > > > > > with e^{j2\pi f_{carrier}t}, in the end.
> > > > > > >
> > > > > > > Your constant signal s(t) = c const. would hence be
> transmitted as
> > > > > > >
> > > > > > > c·e^{j2\pi f_{carrier}t}
> > > > > > >
> > > > > > > whereas a complex sinusoid of frequency f and amplitude a,
> > > > > > > s(t) = a·e^{j2\pi f t) would be transmitted as
> > > > > > >
> > > > > > > a·e^{j2\pi f t)·e^{j2\pi f_{carrier}t} = a·e^{j2\pi
> (f+f_{carrier})t}
> > > > > > >
> > > > > > > so, identical to the constant signal, just at a different
> frequency.
> > > > > > >
> > > > > > >
> > > > > > > Best regards,
> > > > > > > Marcus
> > > > > > >
> > > > > > > On Tue, 2019-07-16 at 17:53 +0100, Simona Sibio wrote:
> > > > > > > > Hi Marcus,
> > > > > > > >
> > > > > > > > Thank you for tip!
> > > > > > > > I know that calibration is not so easy but I hope that.
> > > > > > > > Could you help me to understand what happened with a
> constant complex baseband signal?
> > > > > > > > I am beginner in this field.
> > > > > > > > Thank you for your time.
> > > > > > > >
> > > > > > > > Best Regards,
> > > > > > > >
> > > > > > > > Simona
> > > > > > > >
> > > > > > > > Il giorno mar 16 lug 2019 alle ore 17:39 Müller, Marcus
> (CEL) <address@hidden> ha scritto:
> > > > > > > > > Watch out! What do you get at the *output* of your SDR
> device when you
> > > > > > > > > transmit a constant complex baseband signal, mixed to a
> carrier
> > > > > > > > > frequency? How does that differ from transmitting a
> complex baseband
> > > > > > > > > sinusoid mixed to a carrier frequency?
> > > > > > > > >
> > > > > > > > > On Tue, 2019-07-16 at 18:32 +0200, sumit kumar wrote:
> > > > > > > > > > Ok, so for a constant source, in the time domain you
> will see a flat signal only! Try connecting a spectrum analyzer and you
> shud see a peak at DC becz Fourier transform of constant signal is impulse.
> > > > > > > > > > And yes, as Marcus said, increase the sampling rate!
> > > > > > > > > >
> > > > > > > > > >
> > > > > > > > > > On Tue, 16 Jul 2019 at 18:06, Simona Sibio <
> address@hidden> wrote:
> > > > > > > > > > > Thank you for the assistance.
> > > > > > > > > > >
> > > > > > > > > > > I put the module "constant source" in my flow grap.
> > > > > > > > > > > With this module, I can choose witch amplitude I want
> to send.
> > > > > > > > > > > I attached the flow graph.
> > > > > > > > > > > And, I would want to read these values in the receiver.
> > > > > > > > > > >
> > > > > > > > > > > Simona
> > > > > > > > > > >
> > > > > > > > > > > Il giorno mar 16 lug 2019 alle ore 16:58 sumit kumar <
> address@hidden> ha scritto:
> > > > > > > > > > > > Hi Simona, what is the "constant signal" here ?
> > > > > > > > > > > >
> > > > > > > > > > > > On Tue, 16 Jul 2019 at 17:54, Simona Sibio <
> address@hidden> wrote:
> > > > > > > > > > > > > Hi all,
> > > > > > > > > > > > >
> > > > > > > > > > > > > I want to use GNU radio to measure the amplitude
> and the phase of a signal.
> > > > > > > > > > > > > I send a constant signal with the transmitter USRP
> but in the receiver there is a flat signal with amplitude 0 and offset 0.
> > > > > > > > > > > > > I tried to send a sine signal and the receveir
> works fine.
> > > > > > > > > > > > > How can I do to send only a constant and measure
> the amplitude?
> > > > > > > > > > > > >
> > > > > > > > > > > > > Thank you for your time.
> > > > > > > > > > > > >
> > > > > > > > > > > > > Simona
> > > > > > > > > > > > >
> > > > > > > > > > > > > _______________________________________________
> > > > > > > > > > > > > Discuss-gnuradio mailing list
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Message: 3
Date: Thu, 18 Jul 2019 07:40:08 -0400
From: Barry Duggan <address@hidden>
To: Müller, Marcus (CEL) <address@hidden>
Cc: address@hidden
Subject: Re: [Discuss-gnuradio] Using PyBOMBS to install gnuradio
Message-ID: <address@hidden>
Content-Type: text/plain; charset=UTF-8; format=flowed

Hi Marcus,

I'm using Raspbian buster, which is their latest release.

Thanks,
---
Barry Duggan

On 2019-07-18 05:03, Müller wrote:
> Hi Barry,
>
> which OS / Linux Distro (I presume) are you using on your Pi?
>
> Best regards,
> Marcus
>
> On Wed, 2019-07-17 at 22:09 -0400, Barry Duggan wrote:
>> Hi,
>>
>> Today I tried to install gnuradio in my Raspberry Pi. I encountered
>> the
>> following problems:
>>
>> A. In https://github.com/gnuradio/gnuradio/README.md, PyBOMBS with
>> support of python 3.x:
>> 1. Change the PYTHONPATH line in setup_env.sh, to just 3.x paths.
>>
>> *** Where is 'setup_env.sh'? I can't find it.
>>
>> 2. Find the PyBOMBS recipe "gnuradio.lwr" in .pybombs directory, check
>> this for reference
>>
>> https://github.com/gnuradio/gr-recipes/blob/master/gnuradio.lwr
>>
>> *** In ~/.pybombs/recipes/gr-recipes/gnuradio.lwr there is no entry as
>> above.
>>
>> 3. Change the "gitbranch" to "master".
>>
>> B. In https://wiki.gnuradio.org/index.php/InstallingGR#Using_PyBOMBS,
>> the directions are not the same. Which ones should I follow?
>>
>> Thanks,

------------------------------

Message: 4
Date: Thu, 18 Jul 2019 12:23:00 +0000
From: "N. Benes" <address@hidden>
To: "address@hidden" <address@hidden>,
"address@hidden" <address@hidden>
Subject: Re: [Discuss-gnuradio] GNURadio File meta Sink performance.
Message-ID: <address@hidden>
Content-Type: text/plain; charset=utf-8

If you are on Linux you could just create a file in tmpfs (i.e. RAM).
Use a File Sink with a file in "/dev/shm" for instance (see "man mount"
to configure tmpfs).
Of course you then probably need a lot of RAM (or can capture only small
durations). But it is much faster than disk I/O...

Müller, Marcus (CEL):
> I'll simply pull the stereotypical software guy card:
>
> Then you'll need get faster storage, and probably a faster PC.
>
> Really, run an analysis ("perf top -ag" is an excellent tool for that)
> where your computer is stuck spending most of its time during
> operation. Optimize your resources where it matters.
>
> Best regards,
> Marcus
>
> On Thu, 2019-07-18 at 14:44 +0530, SG wrote:
>> I agree the problem is the amount of samples so I have dropped the idea
>> of storing samples but is there a way to handle such sampling rates in
>> gnuradio? I would like to know the time stamp of the data received which
>> i am unable to access using tag debug. I don't know why but it suddenly
>> stops displaying timestamps on the console while displaying the data
>> decoded by wifi rx.
>>
>> Is there any other way to record timestamps of reception ?
>>
>> Thanks and Regards
>>
>> SG
>>
>> On 18/07/19 2:34 PM, Müller, Marcus (CEL) wrote:
>>> The problem is not the metadata, the problems is the sheer amount of
>>> samples.
>>>
>>> Best regards,
>>> Marcus
>>> On Thu, 2019-07-18 at 13:18 +0530, SG wrote:
>>>> Hi,
>>>>
>>>> Thanks for your reply.
>>>>
>>>> Now that since metadata can't be saved to a file, how can we keep track
>>>> of timestamp of the received packets? I can use tag debug to display the
>>>> timestamps of received signal but when flowgraph starts demodulating
>>>> data it looses track of timestamp display on console. Is there a way to
>>>> save timestamps or display timestamps without fail on console.
>>>>
>>>> Thanks and Regards
>>>>
>>>> SG
>>>>
>>>>
>>>> _______________________________________________
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>>>> address@hidden
>>>> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
>>>>
>>>> _______________________________________________
>>>> Discuss-gnuradio mailing list
>>>> address@hidden
>>>> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio

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