Re: [time-nuts] Anybody who can record last Loran-C transmissions ?

[Poul-Henning Kamp]

In message <20151220235152.gc23...@cs.utwente.nl>, Pieter-Tjerk de Boer writes:

>I'm the developer of that WebSDR, and I was already planning to use it to
>make some raw signal recordings on New Year's eve.

Thankyou!

-- 
Poul-Henning Kamp   | UNIX since Zilog Zeus 3.20
p...@freebsd.org | TCP/IP since RFC 956
FreeBSD committer   | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.
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Re: [time-nuts] Anybody who can record last Loran-C transmissions ?

[Pieter-Tjerk de Boer]

On Sat, Dec 19, 2015 at 10:01:44PM +, Poul-Henning Kamp wrote:
> 
> In message <5675ac3c.8020...@aei.ca>, Graham writes:
> 
> >Would you be able to record what you want via the online web SDR at the 
> >Twente University?
> 
> Not really.  That would only give a water-fall.
> 
> What I think should be preserved is the actual raw, unadultered signal on air.

I'm the developer of that WebSDR, and I was already planning to use it to
make some raw signal recordings on New Year's eve.
This is not just to capture the LORAN shutdown, but also the shutdown of a
bunch of medium-wave broadcast stations (from France, Germany and Luxemburg).

My current plan is to record the 0 - 1800 kHz spectrum (output of the ADC,
but low-pass filtered and downsampled) for at least a couple of minutes
(but possibly more) around "interesting" times such as midnight local time
and midnight UTC.

Regards,
  Pieter-Tjerk (PA3FWM)

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Re: [time-nuts] Anybody who can record last Loran-C transmissions ?

[Lizeth Norman]

Had I known a trip to EU would have been in order. Going for a ham
radio vacation anyway. 8R satellite.
The radio (B210) runs with either of the I7 laptops that are here.

As you point out, making sure that the bus speed and devices are
compatible is key.

The B210 is a "development board" so to speak for the AD 9361. Fun
stuff. Always wondered what the vector calculus would be useful for.



On Sat, Dec 19, 2015 at 11:05 PM, Bill Byrom  wrote:
> The Tektronix RSA306 9 kHz - 6.2 GHz RF signal analyzer samples the IF
> at 112 MS/s (14 bit A/D), so it streams data over USB 3 at 224 MB/sec. A
> PC with an I7 (or even a good I5) and a modern solid state hard drive
> can keep up with this streaming data and store hundreds of GB of
> contiguous streaming samples. These can be read back with the SignalVu-
> PC application (base version is free, but option is required for
> playback) and analyzed as I/Q data (contiguous spectrograms over up to 1
> second, export to Matlab, etc.).
>
> Unfortunately, I'm in Texas so I can't receive these transmissions from
> Europe. ;)
> --
> Bill Byrom N5BB
>
> On Sat, Dec 19, 2015, at 05:10 PM, Lizeth Norman wrote:
>> That's what I said. 61.44MS/s. This thing is a fire hose.
>> Saturate a usb 3.1 without much problem.
>> Gotta love computing!
>>
>> On Sat, Dec 19, 2015 at 5:01 PM, Poul-Henning Kamp 
>> wrote:
>>> 
>>> In message <5675ac3c.8020...@aei.ca>, Graham writes:
>>>
 Would you be able to record what you want via the online web SDR at the
 Twente University?
>>>
>>> Not really.  That would only give a water-fall.
>>>
>>> What I think should be preserved is the actual raw, unadultered signal on 
>>> air.
>>>
>>>
>>> --
>>> Poul-Henning Kamp   | UNIX since Zilog Zeus 3.20
>>> p...@freebsd.org | TCP/IP since RFC 956
>>> FreeBSD committer   | BSD since 4.3-tahoe
>>> Never attribute to malice what can adequately be explained by incompetence.
>>> _
>>> time-nuts mailing list -- time-nuts@febo.com
>>> To unsubscribe, go to 
>>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>>> and follow the instructions there.
>> _
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>
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Re: [time-nuts] Anybody who can record last Loran-C transmissions ?

[Jörg Logemann]

I could make a raw capture with a 14bit Perseus or 16bit Elad FDM-S2 and
a good active receiving antenna, but the station I can receive very
strong is Sylt here in Germany. As far as I know this station will not
shut down...

73 Joerg, DL2NI

Am 19.12.2015 um 12:25 schrieb Magnus Danielson:
> Hi Poul-Henning,
>
> On 12/19/2015 11:35 AM, Poul-Henning Kamp wrote:
>> It doesn't seem like my old hack to record VLF spectrum works anymore.
>>
>> Are there anybody in Europe who can do a raw capture of the VLF spectrum
>> over new years eve to capture the last LORAN-C transmissions as a
>> historical document ?
>>
>> Ideally a 1 MSPS ADC directly on a good antenna, but failing that just
>> a water-fall would be nice...
>>
>
> Nice idea. An SDR with the HF mod would probably be the simplest way
> to do it. As the Loran-C stations lay on top of each other, using a
> multi-station Loran-C receiver in parallel would be nice. The 8000
> chain should suddenly be quite alone.
>
> Cheers,
> Magnus
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-- 
Dipl.Ing.(FH) Jörg Logemann 
Veilchenstraße 3 
D-89150 Laichingen 
Germany 
Tel. +49 7333 922506 
Mobil  +49 171 2814359
Fax. +49 7333 922507 
mail: joerg.logem...@t-online.de

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Re: [time-nuts] Anybody who can record last Loran-C transmissions ?

[Poul-Henning Kamp]

In message <56758aa9.6000...@lai.de>, =?UTF-8?Q?J=c3=b6rg_Logemann?= writes:

>I could make a raw capture with a 14bit Perseus or 16bit Elad FDM-S2 and
>a good active receiving antenna, but the station I can receive very
>strong is Sylt here in Germany. As far as I know this station will not
>shut down...

I have not been able to find any announcements about Sylt either, but
it would be truly strange if that single station continues running...


-- 
Poul-Henning Kamp   | UNIX since Zilog Zeus 3.20
p...@freebsd.org | TCP/IP since RFC 956
FreeBSD committer   | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.
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Re: [time-nuts] Anybody who can record last Loran-C transmissions ?

[Rob Sherwood .]

The Perseus has a higher dynamic range than the Elad, if that matters.  Rob, 
NC0B

Sent from my iPad

> On Dec 19, 2015, at 1:30 PM, "Jörg Logemann"  wrote:
> 
> 
> 
> I could make a raw capture with a 14bit Perseus or 16bit Elad FDM-S2 and
> a good active receiving antenna, but the station I can receive very
> strong is Sylt here in Germany. As far as I know this station will not
> shut down...
> 
> 73 Joerg, DL2NI
> 
>> Am 19.12.2015 um 12:25 schrieb Magnus Danielson:
>> Hi Poul-Henning,
>> 
>>> On 12/19/2015 11:35 AM, Poul-Henning Kamp wrote:
>>> It doesn't seem like my old hack to record VLF spectrum works anymore.
>>> 
>>> Are there anybody in Europe who can do a raw capture of the VLF spectrum
>>> over new years eve to capture the last LORAN-C transmissions as a
>>> historical document ?
>>> 
>>> Ideally a 1 MSPS ADC directly on a good antenna, but failing that just
>>> a water-fall would be nice...
>> 
>> Nice idea. An SDR with the HF mod would probably be the simplest way
>> to do it. As the Loran-C stations lay on top of each other, using a
>> multi-station Loran-C receiver in parallel would be nice. The 8000
>> chain should suddenly be quite alone.
>> 
>> Cheers,
>> Magnus
>> ___
>> time-nuts mailing list -- time-nuts@febo.com
>> To unsubscribe, go to
>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>> and follow the instructions there.
> 
> -- 
> Dipl.Ing.(FH) Jörg Logemann 
> Veilchenstraße 3 
> D-89150 Laichingen 
> Germany 
> Tel. +49 7333 922506 
> Mobil  +49 171 2814359
> Fax. +49 7333 922507 
> mail: joerg.logem...@t-online.de
> 
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> 
> 
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Re: [time-nuts] Anybody who can record last Loran-C transmissions ?

[Graham]

Would you be able to record what you want via the online web SDR at the 
Twente University?


http://websdr.ewi.utwente.nl:8901/

cheers, Graham ve3gtc


On 2015-12-19 10:35, Poul-Henning Kamp wrote:

It doesn't seem like my old hack to record VLF spectrum works anymore.

Are there anybody in Europe who can do a raw capture of the VLF spectrum
over new years eve to capture the last LORAN-C transmissions as a
historical document ?

Ideally a 1 MSPS ADC directly on a good antenna, but failing that just
a water-fall would be nice...



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Re: [time-nuts] Anybody who can record last Loran-C transmissions ?

[Lizeth Norman]

That's what I said. 61.44MS/s. This thing is a fire hose.
Saturate a usb 3.1 without much problem.
Gotta love computing!

On Sat, Dec 19, 2015 at 5:01 PM, Poul-Henning Kamp  wrote:
> 
> In message <5675ac3c.8020...@aei.ca>, Graham writes:
>
>>Would you be able to record what you want via the online web SDR at the
>>Twente University?
>
> Not really.  That would only give a water-fall.
>
> What I think should be preserved is the actual raw, unadultered signal on air.
>
>
> --
> Poul-Henning Kamp   | UNIX since Zilog Zeus 3.20
> p...@freebsd.org | TCP/IP since RFC 956
> FreeBSD committer   | BSD since 4.3-tahoe
> Never attribute to malice what can adequately be explained by incompetence.
> ___
> time-nuts mailing list -- time-nuts@febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
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Re: [time-nuts] Anybody who can record last Loran-C transmissions ?

[Bill Byrom]

The Tektronix RSA306 9 kHz - 6.2 GHz RF signal analyzer samples the IF
at 112 MS/s (14 bit A/D), so it streams data over USB 3 at 224 MB/sec. A
PC with an I7 (or even a good I5) and a modern solid state hard drive
can keep up with this streaming data and store hundreds of GB of
contiguous streaming samples. These can be read back with the SignalVu-
PC application (base version is free, but option is required for
playback) and analyzed as I/Q data (contiguous spectrograms over up to 1
second, export to Matlab, etc.).

Unfortunately, I'm in Texas so I can't receive these transmissions from
Europe. ;)
--
Bill Byrom N5BB
 
On Sat, Dec 19, 2015, at 05:10 PM, Lizeth Norman wrote:
> That's what I said. 61.44MS/s. This thing is a fire hose.
> Saturate a usb 3.1 without much problem.
> Gotta love computing!
>  
> On Sat, Dec 19, 2015 at 5:01 PM, Poul-Henning Kamp 
> wrote:
>> 
>> In message <5675ac3c.8020...@aei.ca>, Graham writes:
>>  
>>> Would you be able to record what you want via the online web SDR at the
>>> Twente University?
>>  
>> Not really.  That would only give a water-fall.
>>  
>> What I think should be preserved is the actual raw, unadultered signal on 
>> air.
>>  
>>  
>> --
>> Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
>> p...@freebsd.org         | TCP/IP since RFC 956
>> FreeBSD committer       | BSD since 4.3-tahoe
>> Never attribute to malice what can adequately be explained by incompetence.
>> _
>> time-nuts mailing list -- time-nuts@febo.com
>> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>> and follow the instructions there.
> _
> time-nuts mailing list -- time-nuts@febo.com
> To unsubscribe, go to
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Re: [time-nuts] Anybody who can record last Loran-C transmissions ?

[Magnus Danielson]

Hi Poul-Henning,

On 12/19/2015 11:35 AM, Poul-Henning Kamp wrote:

It doesn't seem like my old hack to record VLF spectrum works anymore.

Are there anybody in Europe who can do a raw capture of the VLF spectrum
over new years eve to capture the last LORAN-C transmissions as a
historical document ?

Ideally a 1 MSPS ADC directly on a good antenna, but failing that just
a water-fall would be nice...



Nice idea. An SDR with the HF mod would probably be the simplest way to 
do it. As the Loran-C stations lay on top of each other, using a 
multi-station Loran-C receiver in parallel would be nice. The 8000 chain 
should suddenly be quite alone.


Cheers,
Magnus
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Re: [time-nuts] Anybody who can record last Loran-C transmissions ?

[Poul-Henning Kamp]

In message <5675ac3c.8020...@aei.ca>, Graham writes:

>Would you be able to record what you want via the online web SDR at the 
>Twente University?

Not really.  That would only give a water-fall.

What I think should be preserved is the actual raw, unadultered signal on air.


-- 
Poul-Henning Kamp   | UNIX since Zilog Zeus 3.20
p...@freebsd.org | TCP/IP since RFC 956
FreeBSD committer   | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.
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Re: [time-nuts] Anybody who can record last Loran-C transmissions ?

[Poul-Henning Kamp]

In message <56753e8d.8090...@rubidium.dyndns.org>, Magnus Danielson writes:

>Nice idea. An SDR with the HF mod would probably be the simplest way to 
>do it. As the Loran-C stations lay on top of each other, using a 
>multi-station Loran-C receiver in parallel would be nice. The 8000 chain 
>should suddenly be quite alone.

Yes.  It will be interesting to see if that makes it usable.


-- 
Poul-Henning Kamp   | UNIX since Zilog Zeus 3.20
p...@freebsd.org | TCP/IP since RFC 956
FreeBSD committer   | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.
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Re: [time-nuts] Anybody who can record last Loran-C transmissions ?

[Lizeth Norman]

Too bad my vacation takes me south of the border for satellite operations..
Bought an Ettus B210 to play with.
mix, filter and sample!

On Sat, Dec 19, 2015 at 7:30 AM, Poul-Henning Kamp  wrote:
> 
> In message <56753e8d.8090...@rubidium.dyndns.org>, Magnus Danielson writes:
>
>>Nice idea. An SDR with the HF mod would probably be the simplest way to
>>do it. As the Loran-C stations lay on top of each other, using a
>>multi-station Loran-C receiver in parallel would be nice. The 8000 chain
>>should suddenly be quite alone.
>
> Yes.  It will be interesting to see if that makes it usable.
>
>
> --
> Poul-Henning Kamp   | UNIX since Zilog Zeus 3.20
> p...@freebsd.org | TCP/IP since RFC 956
> FreeBSD committer   | BSD since 4.3-tahoe
> Never attribute to malice what can adequately be explained by incompetence.
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