Re: [Discuss-gnuradio] Tuning in VLF with a sound card

[Albin Stigö]

Hi Brad,

Just some random ideas... What you are trying to do is very doable. Ive
seen a lot of people do it for VLF reception... Usually along with some
kind of FET amplifier before the mic...

The frequency xlating FIR filter doesn't have great performance on the rbpi
at the moment.
The frequency xlating FFT filter would be better in your case.

I'm working on a patch that will make these blocks 14 times faster on
raspberry pi so that will also improve things...



--Albin



On Wed, May 8, 2019, 06:06 Brad Hein  wrote:

>
>
>
> On Tue, May 7, 2019 at 4:19 PM Marcus D. Leech 
> wrote:
>
>> On 05/07/2019 04:05 PM, Ben Hilburn wrote:
>>
>> Hey Brad - just checking in! This is an interesting experiment, and I
>> would love to hear how it went!
>>
>> Big thanks to Kevin and JMF for providing very helpful guidance, here,
>> too =)
>>
>> Cheers,
>> Ben
>>
>> I should perhaps have entered this discussion earlier, and pointed out
>> one of my early applications using a sound-card for VLF work:
>>
>> https://github.com/patchvonbraun/SIDSuite
>>
>> It's OLD now--I don't think it was ever converted to GR 3.7
>>
>> One of the problems with mag-loop antenna is that they're very high Q,
>> and thus have very small fractional bandwidths, which means that
>>   they're wildly inefficient at all but the resonant frequency.  I made
>> up for that using a Behringer microphone pre-amp using the balanced input.
>>   That meant I could use a fairly "random" multi-turn mag-loop and not
>> worry about efficiency very much.
>>
>>
> Thanks Marcus - I'll see if I can get it to compile again. In the meantime
> I have put together an AM receiver flowgraph using recommendations from
> this thread, along with what I remembered from the gnuradio tutorials and
> Mike Osman's video tutorials.
>
> https://github.com/regulatre/vlfCoilEperiment
>
> Given a 5-minute recording, which I included in the repo, I quickly found
> that QRM interference will be a hurdle and as you pointed out Marcus, my
> coil (an old VGA degaussing coil) seems to be resonant at undesirable
> frequencies. In its current installation it's getting overwhelmed by a
> steady interference source that sounds like ripples coming from a 60Hz
> half-wave rectifier. There are some gaps in the noise, and as I tuned
> around within the baseband using my flowgraph (in the repo above), I was
> able to tune to various parts of the baseband, but in all cases I had too
> much interference noise.
>
> I have a Focusrite Si2 I could use instead, which would have more gain
> potential and a very low noise floor, but first I think I'll need to find a
> way to get away from the noise sources.
>
>
>
>
>
> ___
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> Discuss-gnuradio@gnu.org
> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
>
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Re: [Discuss-gnuradio] Tuning in VLF with a sound card

[Brad Hein]

As an avid fan of Raspberry Pi, often putting them to use for DSP
applications, I just want to say thank you for your hard work keeping
gnuradio working and optimized on the platform!

I've seen some great FET preamp circuits available on the internet, a few
of which I've tried out. I'll dust one off and see if I can make it work in
this application.



On Wed, May 8, 2019 at 4:15 AM Albin Stigö  wrote:

> Hi Brad,
>
> Just some random ideas... What you are trying to do is very doable. Ive
> seen a lot of people do it for VLF reception... Usually along with some
> kind of FET amplifier before the mic...
>
> The frequency xlating FIR filter doesn't have great performance on the
> rbpi at the moment.
> The frequency xlating FFT filter would be better in your case.
>
> I'm working on a patch that will make these blocks 14 times faster on
> raspberry pi so that will also improve things...
>
>
>
> --Albin
>
>
>
> On Wed, May 8, 2019, 06:06 Brad Hein  wrote:
>
>>
>>
>>
>> On Tue, May 7, 2019 at 4:19 PM Marcus D. Leech 
>> wrote:
>>
>>> On 05/07/2019 04:05 PM, Ben Hilburn wrote:
>>>
>>> Hey Brad - just checking in! This is an interesting experiment, and I
>>> would love to hear how it went!
>>>
>>> Big thanks to Kevin and JMF for providing very helpful guidance, here,
>>> too =)
>>>
>>> Cheers,
>>> Ben
>>>
>>> I should perhaps have entered this discussion earlier, and pointed out
>>> one of my early applications using a sound-card for VLF work:
>>>
>>> https://github.com/patchvonbraun/SIDSuite
>>>
>>> It's OLD now--I don't think it was ever converted to GR 3.7
>>>
>>> One of the problems with mag-loop antenna is that they're very high Q,
>>> and thus have very small fractional bandwidths, which means that
>>>   they're wildly inefficient at all but the resonant frequency.  I made
>>> up for that using a Behringer microphone pre-amp using the balanced input.
>>>   That meant I could use a fairly "random" multi-turn mag-loop and not
>>> worry about efficiency very much.
>>>
>>>
>> Thanks Marcus - I'll see if I can get it to compile again. In the
>> meantime I have put together an AM receiver flowgraph using recommendations
>> from this thread, along with what I remembered from the gnuradio tutorials
>> and Mike Osman's video tutorials.
>>
>> https://github.com/regulatre/vlfCoilEperiment
>>
>> Given a 5-minute recording, which I included in the repo, I quickly found
>> that QRM interference will be a hurdle and as you pointed out Marcus, my
>> coil (an old VGA degaussing coil) seems to be resonant at undesirable
>> frequencies. In its current installation it's getting overwhelmed by a
>> steady interference source that sounds like ripples coming from a 60Hz
>> half-wave rectifier. There are some gaps in the noise, and as I tuned
>> around within the baseband using my flowgraph (in the repo above), I was
>> able to tune to various parts of the baseband, but in all cases I had too
>> much interference noise.
>>
>> I have a Focusrite Si2 I could use instead, which would have more gain
>> potential and a very low noise floor, but first I think I'll need to find a
>> way to get away from the noise sources.
>>
>>
>>
>>
>>
>> ___
>> Discuss-gnuradio mailing list
>> Discuss-gnuradio@gnu.org
>> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
>>
>
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Re: [Discuss-gnuradio] Tuning in VLF with a sound card

[Albin Stigö]

Thanks for the support!

Regarding your VLF experiments there's an historically interesting VLF
transmitter Grimeton SAQ sometimes active on 17.2kHz.
https://alexander.n.se/the-radio-station-saq-grimeton/saq-transmissions/?lang=en


--Albin

On Wed, May 8, 2019 at 2:34 PM Brad Hein  wrote:
>
> As an avid fan of Raspberry Pi, often putting them to use for DSP 
> applications, I just want to say thank you for your hard work keeping 
> gnuradio working and optimized on the platform!
>
> I've seen some great FET preamp circuits available on the internet, a few of 
> which I've tried out. I'll dust one off and see if I can make it work in this 
> application.
>
>
>
> On Wed, May 8, 2019 at 4:15 AM Albin Stigö  wrote:
>>
>> Hi Brad,
>>
>> Just some random ideas... What you are trying to do is very doable. Ive seen 
>> a lot of people do it for VLF reception... Usually along with some kind of 
>> FET amplifier before the mic...
>>
>> The frequency xlating FIR filter doesn't have great performance on the rbpi 
>> at the moment.
>> The frequency xlating FFT filter would be better in your case.
>>
>> I'm working on a patch that will make these blocks 14 times faster on 
>> raspberry pi so that will also improve things...
>>
>>
>>
>> --Albin
>>
>>
>>
>> On Wed, May 8, 2019, 06:06 Brad Hein  wrote:
>>>
>>>
>>>
>>>
>>> On Tue, May 7, 2019 at 4:19 PM Marcus D. Leech  
>>> wrote:

 On 05/07/2019 04:05 PM, Ben Hilburn wrote:

 Hey Brad - just checking in! This is an interesting experiment, and I 
 would love to hear how it went!

 Big thanks to Kevin and JMF for providing very helpful guidance, here, too 
 =)

 Cheers,
 Ben

 I should perhaps have entered this discussion earlier, and pointed out one 
 of my early applications using a sound-card for VLF work:

 https://github.com/patchvonbraun/SIDSuite

 It's OLD now--I don't think it was ever converted to GR 3.7

 One of the problems with mag-loop antenna is that they're very high Q, and 
 thus have very small fractional bandwidths, which means that
   they're wildly inefficient at all but the resonant frequency.  I made up 
 for that using a Behringer microphone pre-amp using the balanced input.
   That meant I could use a fairly "random" multi-turn mag-loop and not 
 worry about efficiency very much.

>>>
>>> Thanks Marcus - I'll see if I can get it to compile again. In the meantime 
>>> I have put together an AM receiver flowgraph using recommendations from 
>>> this thread, along with what I remembered from the gnuradio tutorials and 
>>> Mike Osman's video tutorials.
>>>
>>> https://github.com/regulatre/vlfCoilEperiment
>>>
>>> Given a 5-minute recording, which I included in the repo, I quickly found 
>>> that QRM interference will be a hurdle and as you pointed out Marcus, my 
>>> coil (an old VGA degaussing coil) seems to be resonant at undesirable 
>>> frequencies. In its current installation it's getting overwhelmed by a 
>>> steady interference source that sounds like ripples coming from a 60Hz 
>>> half-wave rectifier. There are some gaps in the noise, and as I tuned 
>>> around within the baseband using my flowgraph (in the repo above), I was 
>>> able to tune to various parts of the baseband, but in all cases I had too 
>>> much interference noise.
>>>
>>> I have a Focusrite Si2 I could use instead, which would have more gain 
>>> potential and a very low noise floor, but first I think I'll need to find a 
>>> way to get away from the noise sources.
>>>
>>>
>>>
>>>
>>>
>>> ___
>>> Discuss-gnuradio mailing list
>>> Discuss-gnuradio@gnu.org
>>> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio

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Re: [Discuss-gnuradio] [GSoC19] Accepted student projects announced!

[Bowen Hu]

Hi all,

I am honored to be accepted by GSoC and GNU Radio. I could not do this without 
the support of community members and mentors.

I will continue to work with the community and try my best to bring the Verilog 
simulation feature into GNU Radio. I will report my progress weekly on the 
mailing list , and if you have any suggestions, please let me know.

Thank you for your congratulations, Arpit, and the same to you.

Best regards,
Bowen Hu

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Re: [Discuss-gnuradio] Tuning in VLF with a sound card

[Marcus D. Leech]

On 05/08/2019 08:33 AM, Brad Hein wrote:
As an avid fan of Raspberry Pi, often putting them to use for DSP 
applications, I just want to say thank you for your hard work keeping 
gnuradio working and optimized on the platform!


I've seen some great FET preamp circuits available on the internet, a 
few of which I've tried out. I'll dust one off and see if I can make 
it work in this application.



I actually used one of these for my VLF work a few years back:

https://www.amazon.com/Behringer-MIC800-Microphone-Modeling-Preamp/dp/B000KUENNU





On Wed, May 8, 2019 at 4:15 AM Albin Stigö > wrote:


Hi Brad,

Just some random ideas... What you are trying to do is very
doable. Ive seen a lot of people do it for VLF reception...
Usually along with some kind of FET amplifier before the mic...

The frequency xlating FIR filter doesn't have great performance on
the rbpi at the moment.
The frequency xlating FFT filter would be better in your case.

I'm working on a patch that will make these blocks 14 times faster
on raspberry pi so that will also improve things...



--Albin



On Wed, May 8, 2019, 06:06 Brad Hein mailto:linuxb...@gmail.com>> wrote:




On Tue, May 7, 2019 at 4:19 PM Marcus D. Leech
mailto:patchvonbr...@gmail.com>> wrote:

On 05/07/2019 04:05 PM, Ben Hilburn wrote:

Hey Brad - just checking in! This is an interesting
experiment, and I would love to hear how it went!

Big thanks to Kevin and JMF for providing very helpful
guidance, here, too =)

Cheers,
Ben

I should perhaps have entered this discussion earlier, and
pointed out one of my early applications using a
sound-card for VLF work:

https://github.com/patchvonbraun/SIDSuite

It's OLD now--I don't think it was ever converted to GR 3.7

One of the problems with mag-loop antenna is that they're
very high Q, and thus have very small fractional
bandwidths, which means that
  they're wildly inefficient at all but the resonant
frequency.  I made up for that using a Behringer
microphone pre-amp using the balanced input.
  That meant I could use a fairly "random" multi-turn
mag-loop and not worry about efficiency very much.


Thanks Marcus - I'll see if I can get it to compile again. In
the meantime I have put together an AM receiver flowgraph
using recommendations from this thread, along with what I
remembered from the gnuradio tutorials and Mike Osman's video
tutorials.

https://github.com/regulatre/vlfCoilEperiment

Given a 5-minute recording, which I included in the repo, I
quickly found that QRM interference will be a hurdle and as
you pointed out Marcus, my coil (an old VGA degaussing coil)
seems to be resonant at undesirable frequencies. In its
current installation it's getting overwhelmed by a steady
interference source that sounds like ripples coming from a
60Hz half-wave rectifier. There are some gaps in the noise,
and as I tuned around within the baseband using my flowgraph
(in the repo above), I was able to tune to various parts of
the baseband, but in all cases I had too much interference noise.

I have a Focusrite Si2 I could use instead, which would have
more gain potential and a very low noise floor, but first I
think I'll need to find a way to get away from the noise sources.





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Re: [Discuss-gnuradio] Recurring memory leak problems with iterative decoding [ GNU Radio 3.7.11.1]

[Ben Hilburn]

Hi Moses -

And just to confirm, if you remove your LDPC block from that flowgraph or
replace it with a passthrough, you don't see the leak?

Cheers,
Ben

On Tue, May 7, 2019 at 7:24 PM Moses Browne Mwakyanjala 
wrote:

> Hello Ben,
> Thanks.
> For LDPC, the executable can be found at
>
> *gr-ccsds/examples/LDPC/ldpc_2/build-ldpc_decoder-Desktop-Debug/ldpc_decoder.*
> The C++ executable for Turbo code can be found at
> *gr-ccsds/lib/fec/turbo/deepspace-turbo/bin/deepspace_turbo*
>
> I'm not very familiar with Valgrind so I monitored the memory usage by
> looking at system monitor on my Ubuntu laptop. The memory usage is almost
> constant, at around 17.1 Mbs for the ldpc_decoder executable. On GNU Radio,
> the memory usage jumps by huge steps (100Mb) in a matter of seconds until
> all the memory (the ram is around 8 gigs) is fully consumed.
>
> Thanks for links to the memory buffer blog post. I will have a look.
> Regards,
> Moses.
>
> On Tue, May 7, 2019 at 10:13 PM Ben Hilburn  wrote:
>
>> Hey Moses -
>>
>> This is really cool work! Thanks so much for sharing it. Michael's
>> suggestion of pushing it was a good one. I haven't looked at the code yet,
>> but:
>>
>> The code was able to run smoothly in a C++ application but experienced
>>> memory leaks in GNU Radio.
>>>
>>
>> I'm curious how confident you are in this? It might be worthwhile to run the 
>> pure-C++ version through Valgrind just to double-check, if you haven't 
>> already.
>>
>> I also have one question regarding buffering in GNU Radio. Since
>>> iterative decoding with a large number of iterations and large block sizes
>>> takes time to complete, the input pmt data that is not consumed immediately
>>> will have to be stored somewhere. Is that the case? Could that be the
>>> reason for the memory leak?
>>>
>>
>> Things do get stored until buffers and full, and then backpressure builds
>> up through the flowgraph. This shouldn't cause memory leaks.
>>
>> For a more thorough explanation of this, check out this excellent blog
>> post from Marcus Mueller!
>>
>> https://www.gnuradio.org/blog/2017-01-05-buffers/
>>
>> Cheers,
>> Ben
>>
>
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Re: [Discuss-gnuradio] RPi Filesystem Image

[Ben Hilburn]

Hi Glen -

We’ve put our event detection on three Raspberry Pi 3B +
> for confirming events in the forward direction (not side lobes).
>

Wow, this is really cool. Thanks so much for sharing!


> I have a 8 GB image .iso that I could put on line this weekend.
> Where is appropriate for such large files?  We installed everything
> on one Pi then just copied the image to the other SD cards.
>

That would be excellent! Storage & bandwidth are indeed tough, though.

We (GNU Radio) pay for storage on Google's cloud servers, and we could host
it there. Do you have a Google account? If so, and you can upload the image
to a Google Drive account and share it with me, I should be able to easily
replicate it over to GNU Radio's storage.

Cheers,
Ben
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Re: [Discuss-gnuradio] RPi Filesystem Image

[Philip Balister]

On 05/08/2019 12:09 PM, Ben Hilburn wrote:
> Hi Glen -
> 
> We’ve put our event detection on three Raspberry Pi 3B +
>> for confirming events in the forward direction (not side lobes).
>>
> 
> Wow, this is really cool. Thanks so much for sharing!
> 
> 
>> I have a 8 GB image .iso that I could put on line this weekend.
>> Where is appropriate for such large files?  We installed everything
>> on one Pi then just copied the image to the other SD cards.
>>
> 
> That would be excellent! Storage & bandwidth are indeed tough, though.

8 GB sounds a bit large, they should compress fairly well, especially if
new.

Ones I did a while back are like 2 GB:

https://www.dropbox.com/sh/fokcr688h2gshxi/AACcv8PUrTaKZoxPlluFxxZPa?dl=0

Philip

> 
> We (GNU Radio) pay for storage on Google's cloud servers, and we could host
> it there. Do you have a Google account? If so, and you can upload the image
> to a Google Drive account and share it with me, I should be able to easily
> replicate it over to GNU Radio's storage.
> 
> Cheers,
> Ben
> 
> 
> 
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Re: [Discuss-gnuradio] RPi Filesystem Image

[Albin Stigö]

An official gnuradio raspberry pi image or PPA would be really neat!

Raspbian comes with an older version of gnuradio not properly optimized.


--Albin

On Wed, May 8, 2019, 18:46 Philip Balister  wrote:

> On 05/08/2019 12:09 PM, Ben Hilburn wrote:
> > Hi Glen -
> >
> > We’ve put our event detection on three Raspberry Pi 3B +
> >> for confirming events in the forward direction (not side lobes).
> >>
> >
> > Wow, this is really cool. Thanks so much for sharing!
> >
> >
> >> I have a 8 GB image .iso that I could put on line this weekend.
> >> Where is appropriate for such large files?  We installed everything
> >> on one Pi then just copied the image to the other SD cards.
> >>
> >
> > That would be excellent! Storage & bandwidth are indeed tough, though.
>
> 8 GB sounds a bit large, they should compress fairly well, especially if
> new.
>
> Ones I did a while back are like 2 GB:
>
> https://www.dropbox.com/sh/fokcr688h2gshxi/AACcv8PUrTaKZoxPlluFxxZPa?dl=0
>
> Philip
>
> >
> > We (GNU Radio) pay for storage on Google's cloud servers, and we could
> host
> > it there. Do you have a Google account? If so, and you can upload the
> image
> > to a Google Drive account and share it with me, I should be able to
> easily
> > replicate it over to GNU Radio's storage.
> >
> > Cheers,
> > Ben
> >
> >
> >
> > ___
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> >
>
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Re: [Discuss-gnuradio] RPi Filesystem Image

[Philip Balister]

On 05/08/2019 01:15 PM, Albin Stigö wrote:
> An official gnuradio raspberry pi image or PPA would be really neat!
> 
> Raspbian comes with an older version of gnuradio not properly optimized.


My understanding Raspbina was bult for the orginal armv6 Pi. The 3 is
aarch64 which is far more interesting for sdr.

Philip

> 
> 
> --Albin
> 
> On Wed, May 8, 2019, 18:46 Philip Balister  wrote:
> 
>> On 05/08/2019 12:09 PM, Ben Hilburn wrote:
>>> Hi Glen -
>>>
>>> We’ve put our event detection on three Raspberry Pi 3B +
 for confirming events in the forward direction (not side lobes).

>>>
>>> Wow, this is really cool. Thanks so much for sharing!
>>>
>>>
 I have a 8 GB image .iso that I could put on line this weekend.
 Where is appropriate for such large files?  We installed everything
 on one Pi then just copied the image to the other SD cards.

>>>
>>> That would be excellent! Storage & bandwidth are indeed tough, though.
>>
>> 8 GB sounds a bit large, they should compress fairly well, especially if
>> new.
>>
>> Ones I did a while back are like 2 GB:
>>
>> https://www.dropbox.com/sh/fokcr688h2gshxi/AACcv8PUrTaKZoxPlluFxxZPa?dl=0
>>
>> Philip
>>
>>>
>>> We (GNU Radio) pay for storage on Google's cloud servers, and we could
>> host
>>> it there. Do you have a Google account? If so, and you can upload the
>> image
>>> to a Google Drive account and share it with me, I should be able to
>> easily
>>> replicate it over to GNU Radio's storage.
>>>
>>> Cheers,
>>> Ben
>>>
>>>
>>>
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> 

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Re: [Discuss-gnuradio] RPi Filesystem Image

[Albin Stigö]

Yeah I think raspbian is built to run on all versions of the raspberry pi
so it's 32 bit and no neon...

I'm running Ubuntu server now built for aarch64 and especially the
improvements in NEON makes it very attractive for SDR indeed..


--Albin

On Wed, May 8, 2019, 19:24 Philip Balister  wrote:

> On 05/08/2019 01:15 PM, Albin Stigö wrote:
> > An official gnuradio raspberry pi image or PPA would be really neat!
> >
> > Raspbian comes with an older version of gnuradio not properly optimized.
>
>
> My understanding Raspbina was bult for the orginal armv6 Pi. The 3 is
> aarch64 which is far more interesting for sdr.
>
> Philip
>
> >
> >
> > --Albin
> >
> > On Wed, May 8, 2019, 18:46 Philip Balister  wrote:
> >
> >> On 05/08/2019 12:09 PM, Ben Hilburn wrote:
> >>> Hi Glen -
> >>>
> >>> We’ve put our event detection on three Raspberry Pi 3B +
>  for confirming events in the forward direction (not side lobes).
> 
> >>>
> >>> Wow, this is really cool. Thanks so much for sharing!
> >>>
> >>>
>  I have a 8 GB image .iso that I could put on line this weekend.
>  Where is appropriate for such large files?  We installed everything
>  on one Pi then just copied the image to the other SD cards.
> 
> >>>
> >>> That would be excellent! Storage & bandwidth are indeed tough, though.
> >>
> >> 8 GB sounds a bit large, they should compress fairly well, especially if
> >> new.
> >>
> >> Ones I did a while back are like 2 GB:
> >>
> >>
> https://www.dropbox.com/sh/fokcr688h2gshxi/AACcv8PUrTaKZoxPlluFxxZPa?dl=0
> >>
> >> Philip
> >>
> >>>
> >>> We (GNU Radio) pay for storage on Google's cloud servers, and we could
> >> host
> >>> it there. Do you have a Google account? If so, and you can upload the
> >> image
> >>> to a Google Drive account and share it with me, I should be able to
> >> easily
> >>> replicate it over to GNU Radio's storage.
> >>>
> >>> Cheers,
> >>> Ben
> >>>
> >>>
> >>>
> >>> ___
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> >>> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
> >>>
> >>
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> >>
> >
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Re: [Discuss-gnuradio] RPi Filesystem Image

[John Ackermann N8UR]

There is some magic involved in shrinking a RPi image so that it will
then expand when reinstalled, like the original Raspbian.  I went
through the pain a while ago and documented it here:
https://blog.febo.com/?p=283

John


On 5/8/19 12:45 PM, Philip Balister wrote:
> On 05/08/2019 12:09 PM, Ben Hilburn wrote:
>> Hi Glen -
>>
>> We’ve put our event detection on three Raspberry Pi 3B +
>>> for confirming events in the forward direction (not side lobes).
>>>
>>
>> Wow, this is really cool. Thanks so much for sharing!
>>
>>
>>> I have a 8 GB image .iso that I could put on line this weekend.
>>> Where is appropriate for such large files?  We installed everything
>>> on one Pi then just copied the image to the other SD cards.
>>>
>>
>> That would be excellent! Storage & bandwidth are indeed tough, though.
> 
> 8 GB sounds a bit large, they should compress fairly well, especially if
> new.
> 
> Ones I did a while back are like 2 GB:
> 
> https://www.dropbox.com/sh/fokcr688h2gshxi/AACcv8PUrTaKZoxPlluFxxZPa?dl=0
> 
> Philip
> 
>>
>> We (GNU Radio) pay for storage on Google's cloud servers, and we could host
>> it there. Do you have a Google account? If so, and you can upload the image
>> to a Google Drive account and share it with me, I should be able to easily
>> replicate it over to GNU Radio's storage.
>>
>> Cheers,
>> Ben
>>
>>
>>
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