HI LAB Survey network problem..

[Stephen Arbogast]

Getting  this  response, hopefully  temporary...

[Stephen Arbogast]

Very  cool, using SDR Angel... would like  to see  LAB  response in my spectrum...

[Stephen Arbogast]

I meant  LAB  Reference...

[Stephen Arbogast]

I  should see something  like this...  any  one  know   what is  going on?  Maybe  recent  G4   storms?  

[Stephen Arbogast]

Server   or  gateway   seems to  be   down   around the  world..  any one    have   ideas?

[fasleitung3]

I happened to talk to one of the guys from IT at the Argelander Institute yesterday. They were aware of the problem and tracing the root cause at that time.

It seems it is fixed now.

Thanks to the Argelander Institute for providing this service.

Best regards,

Wolfgang

Am Dienstag, den 20.01.2026, 15:52 -0800 schrieb 'Stephen Arbogast' via Society of Amateur Radio Astronomers:

Getting  this  response, hopefully  temporary...

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[Ayushman Tripathi]

Hi, Stephen.

It seems to be fixed now, I'm not seeing that error anymore.

(W) RadioAstronomyGUI::networkManagerFinished: error(499): QNetworkReply::UnknownServerError: "Error transferring https://www.astro.uni-bonn.de/hisurvey/euhou/LABprofile/index.php - server replied: Bad Gateway"

Thanks.

[Ayushman Tripathi]

Thanks, Wolfgang. Even after that's fixed, I'm still debugging why it's still not able to show the LAB data even after it downloaded the files. Though I see no errors now in the logs. 

[Ayushman Tripathi]

It does appear for a second, and then it disappears. Maybe it'll work with the Tsys K/Source calibrated spectrum, but it's incompatible with dBFS and it can't auto scale for dBFS. I'll test soon.

[Stephen Arbogast]

Hi All,

I am experiencing exactly the same... SDRAngel  is downloading and saving the  LAB data files but the plot does not show up.   A bug in SDRAngel I assume.

[Stephen Arbogast]

My mind is getting buggy!  I ran Hot and Cold calibration (just  some data)  and  got results.

[Frank Forte]

Hi,

Do you know if SDR Angel will run with a Nooelec Smart V5? I am new to Radio Astronomy.

Thanks

[Stephen Arbogast]

I'm not 100% sure. I built SDRAngel on my minipc  that I run it on.   Here is the page of instructions:

https://github.com/f4exb/sdrangel/wiki/Compile-from-source-in-Linux

that shows all the drivers.

I think the RTL-SDR  driver might work.  Can you run a utility to query your Nooelec Smart V5 and get info on the driver?

[Stephen Arbogast]

See this... 

https://www.google.com/search?q=linux+driver+required+for+noolecc+smart+5&client=ubuntu-sn&hs=sQY&sca_esv=3a7bfe1ca1db5972&channel=fs&sxsrf=ANbL-n45FDpjb4wuGscBkJ7SzzQj2ULY8g%3A1769142650447&ei=evlyaauQG_iekPIPzaClkQk&ved=0ahUKEwirtfL56aCSAxV4D0QIHU1QKZIQ4dUDCBE&uact=5&oq=linux+driver+required+for+noolecc+smart+5&gs_lp=Egxnd3Mtd2l6LXNlcnAiKWxpbnV4IGRyaXZlciByZXF1aXJlZCBmb3Igbm9vbGVjYyBzbWFydCA1MggQABiABBiiBDIFEAAY7wUyBRAAGO8FMgUQABjvBUinf1DnL1jfeXACeAGQAQCYAZYCoAGtHqoBBjAuMTkuMrgBA8gBAPgBAZgCD6ACuxPCAgoQABiwAxjWBBhHwgIIEAAYogQYiQWYAwDiAwUSATEgQIgGAZAGCJIHBjIuMTEuMqAH60yyBwYwLjExLjK4B68TwgcGMC4xMi4zyAcfgAgA&sclient=gws-wiz-serp

Sounds like all you need is the rtl-sdr driver.

[Stephen Arbogast]

Again, very  cool.  I am not properly calibrated  but  you get the  idea.

Maybe  a  future  enhancement  to  ezRA  ezPlot????

[Ayushman Tripathi]

Hi Frank,

Yes, SDRAngel works with NESDR using RTL USB. I also tested it with RTL-TCP,  and it works fine, though running remotely over TCP will eat through 90 GB of data in about 3 hours!

SDRAngel is prebuilt for many platforms, it even works on Android phones/tablets (I tested radio astronomy plugin on android version also with RTL TCP, it works fine) , but there's no app for iPadOS.

You can check here: https://github.com/f4exb/sdrangel/wiki/Quick-start

I installed the prebuilt version on my Ubuntu 25.04 server, but I built it from source on my Raspberry Pi 500.

Thanks,

Ayushman

[Stephen Arbogast]

An  update......   Keep in mind   I have not  properly  calibrated my  system.   This  shows   what  is  possible!

[Ayushman Tripathi]

Hi Stephen,

Nice, Yes the ezRA integration will be very useful. I'll run some calibration tests and share the results, though proper calibration will be challenging.

Thanks

[Stephen Arbogast]

Well,  I am  kind of  a  computational  physics  and   digital  signal processing   nerd...  so many  problems can  be  solved  with  computation, not  possible  analytically.

[Stephen Arbogast]

So  happy  to  see this   resource   available  again.....    Thanks   all..   this resource  is very  important...........

[Stephen Arbogast]

I   recommend that if you   want    to  to  run  SDRAngel   you  build it   from   source   for   your  hardware it  will apply   optimizations.....     I am  running   on Ubuntu  Linux 24.04.3  with   optimizations.

[Frank Forte]

Thanks Stephen, I'll give it a look and try. Steep learning curve.

[Frank Forte]

Thanks Ayushman,

I think I need to either use a WIndows machine or build a Raspberry Pi to have a better experience. I currently am using an old Macbook Pro with Cubic SDR. It works but I seem to have freezing issues and quite honestly I need to get a better understanding of what I am looking for and how to use the program. I am only using the short antenna that came with Nooelec, which is only really good for FM. I am working my way up to H line but need to construct a horn antenna. That is why I asked about SDR angel. Thanks for the help.

[Frank Forte]

Thanks again Stephen. I am going to check a few things out.

[Ayushman Tripathi]

Hi Stephen,

Yes, I first tested with the Snapstore version last month and it had issues. For my current Ubuntu system, I just downloaded the Christmas release .deb from here: https://github.com/f4exb/sdrangel/releases/download/v7.22.10/sdrangel_7.22.10_ubuntu-24.04_amd64.deb

Building from source is definitely the best option though. I did that for my Raspberry Pi 500. I’ll build the next release from source on my main system as well, I already have the build environment set up. I can provide builds as I have a dedicated build machine. Happy to publish them here for future versions if that would be useful for the latest Ubuntu.

Thanks

[Alex P]

Frank,

If you want to try software which is easy to implement and not difficult to learn or use

search   HLine3D   
Your SDR must be compatible with SDR#  ( an Airspy product or RTL-SDR type ) and

run a Windows environment ( W 7 10 11 )

Alex Pettit

=================================================

On Friday, January 23, 2026 at 6:43:11 AM UTC-5 Frank Forte wrote:

[Frank Forte]

Alex,

Thanks,  I'll give it a try. I'm not sure my nooelec smart v5 is compatible,  but i think it's worth a shot. 

Frank Forte

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[b alex pettit jr]

Hello Frank,

Yes, that SDR should work fine ..

Here's the website an links to download the Zadig Driver , a version of SDR# with IFavg installed, the HL3D Java

script, links to the Rinarn Graphic 2D & 3D software & Hopefully, useful documentation for everything.

FYI : the 3D graphic plots may look impressive,  

However,  the 2D graphics allow  you to eval the performance of your system & compare changes.

And loading the IF_avg *.txt files into Excel ( or equiv ) is fine for quick evals also ... ( template for that  also )

https://github.com/AP-HLine-3D/HLine3D

Overview of the steps

This is the process implemented to remove drift & convert the files to a calibrated dB  scale referenced to a non H Line Cold_Sky frequency ( operator selected )

 From my experience, its easier to begin with less complex software to eval your system and then try custom software / write your own.

I have eval'd well over a dozen designs with this software & have a small 'library' of  performance characteristics for various small H Line systems

I began using SDR# & IF_avg ~ 5 years ago. I can  process files from my earliest attempts =  THAT is the value with 'standardizing' software

Regards,

Alex Pettit

=================================================

On Friday, January 23, 2026 at 02:04:26 PM EST, Frank Forte <frank....@gmail.com> wrote:

Alex,

Thanks,  I'll give it a try. I'm not sure my nooelec smart v5 is compatible,  but i think it's worth a shot. 

Frank Forte

.

[Frank Forte]

Alex, thanks. It looks impressive.

[b alex pettit jr]

Frank,

I'm available to assist getting you started .. email / phone call etc.

Get everything downloaded and installed : see how it goes from there ..

Once Configured, the changes from test to test are minimal.

The most tedious is probably the adjustments to make the 3D plots show well - but that is the "Cake & IceCream" 

Its the 'Meat & Potatoes"  2D plots from which you can learn and eval your system :)

Regards,

Alex P

On Friday, January 23, 2026 at 04:25:26 PM EST, Frank Forte <frank....@gmail.com> wrote:

Alex, thanks. It looks impressive.

[Frank Forte]

Alex,

Thanks. I have a few things to work out and sort first,  but will probably take you up on that offer. Much appreciated. 

Frank

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[b alex pettit jr]

FYI, it doesn't take a lot of PC horsepower.. I've run it on 10-15 yr old notebooks / desktops without issues

( I modified / enhanced the HL3D processing on a 12 yr old Win7 desktop ) 

================================================================================

On Friday, January 23, 2026 at 06:31:10 PM EST, Frank Forte <frank....@gmail.com> wrote:

Alex,

[Ayushman Tripathi]

Another interesting feature of SDRangel is its collection of various sky maps. I also added a feature in Virgo to output the median-filtered spectrum by default (the smoothed line that removes RFI spikes), see attached comparison showing raw vs filtered data.

[Stephen Arbogast]

Nice!

[Ayushman Tripathi]

Previously, Virgo only displayed the filtered line (the smooth one without RFI spikes) in the plot image but didn't export it to the data file. I added the export option for the median-filtered data, which can be directly used with ezRA etc.

[b alex pettit jr]

FYI,

Matlab has a filtering process called FiltFilt whereby the sequence is smoothed from both left then right to  remove any phase shift 

filtfilt

Zero-phase digital filtering

https://www.mathworks.com/help/signal/ref/filtfilt.html

[Ayushman Tripathi]

Hi Alex,

Sure, I'll check that. From what I understand, Virgo uses a median filter, which is non-linear.

Anyway, here's what Virgo outputs by default (without my changes). I added the option to save the median-filtered data that it already uses for plotting, previously it wasn't saved anywhere, so that clean data was lost and couldn't be used for further processing.

https://virgo.readthedocs.io/en/latest/reference.html#plot

Thanks.

[Stephen Arbogast]

I  think  we should  be  very  careful  about   comparing  our  results...   we   are   scattered   across the  world.  My  results    here in  Southwest   Colorado are  subject  to    snow storms and  neighbors  use of  heat  pumps   and   solar   panels..