GNU Radio Spectral Radiometer

[Stephen Arbogast]

A  problem.....   I am using GNU Radio  Spectral Radiometer   with Discovery Dish and  AirSpy R2  at  10 M samples/sec. I  am  finally  getting  good real  time  results after  lowering  the  overall  gain from  45  to 40.   So   I  thought  I would  try  to correct   the  problem  with  the  block ezRA Vector Logger since  I  want  to  use  ezRACon.py  

By following  the instructions  to  add/modify an embedded  python  block  I have  been  successful in  adding  another  row  to the header  of output  file ezRA.....txt  with   AzDeg   but  the value  does not  show.  See  attached..

I have manually  edited  the output file   to make it  work  before  running  ezCon.py   to make  things  work.

Has anyone  else run into this problem?

[Stephen Arbogast]

Manually edit the  file   and  it  works...   such as 

[Stephen Arbogast]

Just curious ........how many  people are using     GNU Radio  Spectral  Radiometer?

[jpett...@gmail.com]

I use it, but not exclusively.

 

Jonathan Pettingale

 

 

 

From: 'Stephen Arbogast' via Society of Amateur Radio Astronomers <sara...@googlegroups.com>
Sent: Wednesday, September 24, 2025 12:00 AM
To: Society of Amateur Radio Astronomers <sara...@googlegroups.com>
Subject: [SARA] Re: GNU Radio Spectral Radiometer

 

Just curious ........how many  people are using     GNU Radio  Spectral  Radiometer?

 

 

On Tuesday, September 23, 2025 at 7:26:15 PM UTC-6 Stephen Arbogast wrote:

Manually edit the  file   and  it  works...   such as 

 

 

 

 

 

On Tuesday, September 23, 2025 at 7:12:05 PM UTC-6 Stephen Arbogast wrote:

A  problem.....   I am using GNU Radio  Spectral Radiometer   with Discovery Dish and  AirSpy R2  at  10 M samples/sec. I  am  finally  getting  good real  time  results after  lowering  the  overall  gain from  45  to 40.   So   I  thought  I would  try  to correct   the  problem  with  the  block ezRA Vector Logger since  I  want  to  use  ezRACon.py  

 

By following  the instructions  to  add/modify an embedded  python  block  I have  been  successful in  adding  another  row  to the header  of output  file ezRA.....txt  with   AzDeg   but  the value  does not  show.  See  attached..

 

I have manually  edited  the output file   to make it  work  before  running  ezCon.py   to make  things  work.

 

Has anyone  else run into this problem?

 

 

 

 

 

 

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[Stephen Arbogast]

I like   GNU Radio... saves me  time. I  don't  have  to write generic blocks....handles  the    ring  buffers  and scheduling  ...  but   I am having   problems modifying  the  ezRa Vector Logger in GSR    by  Marcus   Leech.   I can add stuff  like   antenna  azDeg  and elDeg......  to conform  to ezRA    shows  up in the .grc   but won't run     says   undefined  for  both ...... is this  a  bug  in  gnu  radio?

[jpett...@gmail.com]

Are you using https://github.com/Radio-Source/GSR?

To view this discussion visit https://groups.google.com/d/msgid/sara-list/b8c383fa-0bbc-4d5c-a1bd-aa6c7d162f11n%40googlegroups.com.

[Marcus D. Leech]

On 2025-09-24 02:01, 'Stephen Arbogast' via Society of Amateur Radio Astronomers wrote:

I like   GNU Radio... saves me  time. I  don't  have  to write generic blocks....handles  the    ring  buffers  and scheduling  ...  but   I am having   problems modifying  the  ezRa Vector Logger in GSR    by  Marcus   Leech.   I can add stuff  like   antenna  azDeg  and elDeg......  to conform  to ezRA    shows  up in the .grc   but won't run     says   undefined  for  both ...... is this  a  bug  in  gnu  radio?

GSR is not mine, although it's based on my earlier "Spectro Radiometer" and "BAA Seminar" applications, it's a "hybrid" constructed by Pierre Terrier, NOT ME!

This is very very unlikely to be a bug in Gnu Radio, and more likely to be a problem in your understanding of Python semantics, or the semantics of GRC.

To view this discussion visit https://groups.google.com/d/msgid/sara-list/b8c383fa-0bbc-4d5c-a1bd-aa6c7d162f11n%40googlegroups.com.

[Stephen Arbogast]

Yes

[Stephen Arbogast]

Got it working and yes I will raise this as issue on https://github.com/Radio-Source/GSR?tab=readme-ov-file

[tedcl...@gmail.com]

Hi Stephen,

I gave you that   ezColGR.grc   code and told you it was experimental.

It is unfinished in many ways.

I have been tearing my hair out on Gnu Radio for 3 months trying to get it to work.

It is my code and unfinished.

Do not bother others about it.

---
Ted Cline
TedClineGit at gmail.com

On Wednesday, September 24, 2025 at 1:35:43 PM UTC-6 Stephen Arbogast wrote:

Got it working and yes I will raise this as issue on https://github.com/Radio-Source/GSR?tab=readme-ov-file

...

[Marcus D. Leech]

On 2025-09-25 14:51, tedcl...@gmail.com wrote:

Hi Stephen,

I gave you that   ezColGR.grc   code and told you it was experimental.

It is unfinished in many ways.

I have been tearing my hair out on Gnu Radio for 3 months trying to get it to work.

It is my code and unfinished.

Do not bother others about it.

---
Ted Cline
TedClineGit at gmail.com

Ted:

You're aware of resources like the discuss-gnuradio mailing list and chat.gnuradio.org?

Also, the gnuradio.org website has a lot of tutorials on it these days.

If you're a "conventional procedural programmer" (as I am, mostly), then GRC's "dataflow" programming model can seem quite foreign, but you soon get used to it.
  I come at this from the perspective of someone who got involved in Gnu Radio over 20 years ago(!!!), so I perspective is warped considerably compared to the
  perspective of a newcomer.     But I think for GRC, the main stumbling block (assuming you're already comfortable with Python) is the data-flow programming
  model.

On Wednesday, September 24, 2025 at 1:35:43 PM UTC-6 Stephen Arbogast wrote:

Got it working and yes I will raise this as issue on https://github.com/Radio-Source/GSR?tab=readme-ov-file

...

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[Stephen Arbogast]

Ted,  I am referring to code by    Pierre Terrier here...     https://github.com/Radio-Source/GSR?tab=readme-ov-file

[Stephen Arbogast]

My  journey with GNU  Radio  started  about  five years  ago,  first the the tutorials  then  I realized  I need to understand the data flow,  decimation and interpolation. Then  I realized I need to learn more, a lot more  about  digital signal processing.  I   began  going  through this  self   guided course....   https://github.com/spatialaudio/digital-signal-processing-lecture   which  I have  learned  a lot  from.

Just curious if  Marcus  has any suggestions  for other  courses on digital signal processing  ....  umm.. some  mathematics involved.

[Marcus D. Leech]

On 2025-09-25 19:31, 'Stephen Arbogast' via Society of Amateur Radio Astronomers wrote:

My  journey with GNU  Radio  started  about  five years  ago,  first the the tutorials  then  I realized  I need to understand the data flow,  decimation and interpolation. Then  I realized I need to learn more, a lot more  about  digital signal processing.  I   began  going  through this  self   guided course....   https://github.com/spatialaudio/digital-signal-processing-lecture   which  I have  learned  a lot  from.

Just curious if  Marcus  has any suggestions  for other  courses on digital signal processing  ....  umm.. some  mathematics involved.

There's www.complextoreal.com   and www.dsprelated.com, and also the excellent www.pysdr.org -- by Dr. Marc Lichtmann, who is also a contributor to Gnu Radio.

To view this discussion visit https://groups.google.com/d/msgid/sara-list/340727a5-238c-485d-94b6-08671584b8d8n%40googlegroups.com.

[Stephen Arbogast]

I   have not  cleaned  my  raw  data   but    I am getting the  correct   declination.........   for  my  location.

[Stephen Arbogast]

Ted,  I  am not  trying to  hijack  your   code....   I  suggested  an addition to   Pierre's   GNU  Radio  code  so that  I can  see  the  correct   declination   from  ezPlot.py..  It is working  now .....    He updated  his  github   repo    so  all  can  view it.  See  https://github.com/Radio-Source/GSR/issues/1

On Thursday, September 25, 2025 at 12:51:41 PM UTC-6 tedcl...@gmail.com wrote:

[Stephen Arbogast]

I mean   ezSky.py