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Greetings DSPIRA, I love the idea of measuring hydrogen in the Milky Way. Having learnt about DSPIRA from an article in The Physics Teacher, I built the telescope during summer break, and am now trying to test it. I have been trying to run the spectrometer_w_cal.grc program. However, I seem to get an error. .....
..... However, the Execute button is greyed out, and when I hit it anyway, this message appears: ..... Executing: /usr/bin/python3 -u /home/ubuntu/gr-radio_astro/examples/DSPIRA/DSPIRA_Spectrometer.py Warning: failed to XInitThreads() The signal in the Spectrum graph is very weak, so I suspect something's wrong. I'd be grateful for any suggestions. Kind regards, Morten Christensen |
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Dear Morten Christensen,
Your messages are all reasonable warnings, but not errors.
If you are seeing a signal at all, then your software is fine.
If the signal is weak, than perhaps you need a more powerful amplifier.
What amplifier are you using?
It is likely that you need to update the gain settings for your AIRSPY mini.
This is done using gnuradio-companion.
I think that now you set only the LNA gain; try between 15 and 20
Set the other two gains to zero, which enables the software to optimize
These other gain values.
Maybe also email a screen shot of your spectrum.
In addition, you could try
python3 NsfIntegrate60.py
Best regards
Glen
From: skywise-8 ***@***.***>
Sent: Thursday, September 2, 2021 10:52 AM
To: WVURAIL/dspira-lessons ***@***.***>
Cc: Subscribed ***@***.***>
Subject: [EXTERNAL] - Re: [WVURAIL/dspira-lessons] dspira-lessons/forum/gnuradio/ (#7)
This email originated from outside of the National Science Foundation. Do not click links or open attachments unless you recognize the sender and know the content is safe.
Greetings DSPIRA,
I love the idea of measuring hydrogen in the Milky Way. Having learnt about DSPIRA from an article in The Physics Teacher, I built the telescope during summer break, and am now trying to test it.
I have been trying to run the spectrometer_w_cal.grc program. However, I seem to get an error.
I'm running Ubuntu from a flashdrive. GNU radio opens nicely, with the spectrometer program displayed:
.....
<<< Welcome to GNU Radio Companion 3.8.1.0 >>>
Block paths:
/usr/share/gnuradio/grc/blocks
/usr/local/share/gnuradio/grc/blocks
Loading: "/home/ubuntu/gr-radio_astro/examples/DSPIRA/spectrometer_w_cal.grc"
Done
.....
However, the Execute button is greyed out, and when I hit it anyway, this message appears:
.....
Generating: '/home/ubuntu/gr-radio_astro/examples/DSPIRA/DSPIRA_Spectrometer.py'
Executing: /usr/bin/python3 -u /home/ubuntu/gr-radio_astro/examples/DSPIRA/DSPIRA_Spectrometer.py
Warning: failed to XInitThreads()
gr-osmosdr 0.2.0.0 (0.2.0) gnuradio 3.8.1.0
built-in source types: file osmosdr fcd rtl rtl_tcp uhd miri hackrf bladerf rfspace airspy airspyhf soapy redpitaya freesrp
Using AirSpy MINI v1.0.0-rc10-0-g946184a 2016-09-19, samplerates: 3M 6M
.....
The signal in the Spectrum graph is very weak, so I suspect something's wrong.
I'd be grateful for any suggestions.
Kind regards,
Morten Christensen
Copenhagen, Denmark
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Dear Glen Thank you so much for your reply. I am getting a signal, sort of, though very weak. In the spectrometer_w_cal.grc program, the only reference to gain I see is in the “osmocom Source”-box. However, there is RF Gain, IF Gain and BB Gain. Default values are 17, 12, 10 respectively. I'm attaching screenshots of the spectrometer_w_cal.grc program. No changes to the gain settings in the "osmocom Source"-box on the left. Then graphs before and after calibration. Btw, the Airspy Mini is getting awfully hot. Is this normal? Kind regards,
|
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Hi Morten,
The RF Gain should be 20 to 25, I think,
Set the other gains to zero, if the automatic adjustment of gain is working in
your version of the code.
If the signal is still weak, then set the RF gain to 20 and the
other two gains to 15, the maximum, I think.
Glen
Glen I Langston, Ph. D.
Galactic Astronomy Program Director
National Science Foundation
304-456-3032
… On Sep 3, 2021, at 11:38 AM, skywise-8 ***@***.***> wrote:
This email originated from outside of the National Science Foundation. Do not click links or open attachments unless you recognize the sender and know the content is safe.
Dear Glen
Thank you so much for your reply.
I am getting a signal, sort of, though very weak.
I’m using the Nooelec SAWbird +H1 LNA.
In the spectrometer_w_cal.grc program, the only reference to gain I see is in the “osmocom Source”-box. However, there is RF Gain, IF Gain and BB Gain. Default values are 17, 12, 10 respectively.
Which of these should be set to zero?
I'm attaching screenshots of the spectrometer_w_cal.grc program. No changes to the gain settings in the "osmocom Source"-box on the left. Then graphs before and after calibration.
Btw, the Airspy Mini is getting awfully hot. Is this normal?
Kind regards,
Morten
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I am attempting to run spectrometer_w_cal.grc. It fails and I get these messages: Generating: '/home/pi/gr-radio_astro/examples/DSPIRA/DSPIRA_Spectrometer.py' Any suggestions on how to solve this problem would be appreciated! |
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Hi
Hope all are doing well and gathering lots of observations.
I’ve been working to accurately make a map of all the observations.
Here is a link to a couple Jupyter notebooks for preparing for making
the maps. These are intended for student use.
See:
https://github.com/glangsto/jupyter/tree/master/offsets
The two notebooks at this location do not require any data, but
rather show how to understand your observations.
As an added bonus, the 2nd notebook shows how to get
your home address in Earth X,Y,Z coordinates and
calculate your distance from the GBT.
To use (in a linux box) type:
cd ~
pip3 install jupyterlab
git clone http://www.github.com/glangsto/jupyter
cd jupyter/offsets
jupyter-lab
Have fun,
Glen
I just tested that this works great in the Raspberry PI Os
that Franco just finished.
It takes about 60 seconds for jupyter lab to open up,
You need to click on the notebooks to run them.
Glen I Langston, Ph. D.
Galactic Astronomy Program Director
National Science Foundation
304-456-3032
|
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Hi Tom,
It looks like you’re running this on a Raspberry Pi (good).
Somehow the radio_astro code is not in your python path.
Which version of the operating system do you have?
(ie when did you get it?)
It might be best to get the latest version, which is on a google drive.
The installation guide is here:
https://drive.google.com/file/d/1ssS_zBQWDEXMENc2_aqqPGxGkEEU5Ea3/view?usp=sharing
The slightly newer operating system version is:
https://drive.google.com/file/d/11H1g03-TW1jDbSlozNbuUKCPifASMEBF/view?usp=sharing
With this version you should be logging in as
radioastro (word: Aficionado)
Glen
Glen I Langston, Ph. D.
Galactic Astronomy Program Director
National Science Foundation
304-456-3032
… On Feb 5, 2022, at 10:47 AM, Tconsi ***@***.***> wrote:
This email originated from outside of the National Science Foundation. Do not click links or open attachments unless you recognize the sender and know the content is safe.
I am attempting to run spectrometer_w_cal.grc. It fails and I get these messages:
Generating: '/home/pi/gr-radio_astro/examples/DSPIRA/DSPIRA_Spectrometer.py'
Executing: /usr/bin/python3 -u /home/pi/gr-radio_astro/examples/DSPIRA/DSPIRA_Spectrometer.py
Warning: failed to XInitThreads()
Traceback (most recent call last):
File "/home/pi/gr-radio_astro/examples/DSPIRA/DSPIRA_Spectrometer.py", line 43, in
import radio_astro
ModuleNotFoundError: No module named 'radio_astro'
Any suggestions on how to solve this problem would be appreciated!
Tom
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Tom, There are a couple of things to check: Is gr-raduo_astro installed on your computer? Also, check that the python environment has been set. These extra steps are needed after gr-radio_astro has been installed and "make installed". Refer to the "Additional Steps for setting the proper Python environment" under Installing gr-radio_astro in the Telescope Software Setup module. If you've already done this, then restart the terminal. If it still doesn't work, we can troubleshoot from there. John |
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Hi Tom and John,
John has a good point. If you’ve downloaded the code from GitHub,
Then you need to build and install the code.
On a raspberry pi, this is done with:
cd ~
git clone http://www.github.com/WVURAIL/gr-radio_astro
cd gr-radio_astro
mkdir build
cd build
cmake ..
make -j 3
sudo make install
sudo ldconfig
You’ve probably done a few of these steps.
Good luck,
Glen
… On Feb 5, 2022, at 1:28 PM, jmakous ***@***.***> wrote:
Tom,
There are a couple of things to check: Is gr-raduo_astro installed on your computer? Also, check that the python environment has been set. These extra steps are needed after gr-radio_astro has been installed and "make installed". Refer to the "Additional Steps for setting the proper Python environment" under Installing gr-radio_astro in the Telescope Software Setup module.
If you've already done this, then restart the terminal. If it still doesn't work, we can troubleshoot from there.
John
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Glen,
Thanks for the quick response and the info. I decided to install the
operating system with gnu radio and your telescope software already
installed. It worked like a charm!
My telescope is now outside gathering data.
Cheers!
Tom
On Sat, Feb 5, 2022 at 12:34 PM Glen Langston ***@***.***>
wrote:
… Hi Tom,
It looks like you’re running this on a Raspberry Pi (good).
Somehow the radio_astro code is not in your python path.
Which version of the operating system do you have?
(ie when did you get it?)
It might be best to get the latest version, which is on a google drive.
The installation guide is here:
https://drive.google.com/file/d/1ssS_zBQWDEXMENc2_aqqPGxGkEEU5Ea3/view?usp=sharing
The slightly newer operating system version is:
https://drive.google.com/file/d/11H1g03-TW1jDbSlozNbuUKCPifASMEBF/view?usp=sharing
With this version you should be logging in as
radioastro (word: Aficionado)
Glen
Glen I Langston, Ph. D.
Galactic Astronomy Program Director
National Science Foundation
304-456-3032
> On Feb 5, 2022, at 10:47 AM, Tconsi ***@***.***> wrote:
>
> This email originated from outside of the National Science Foundation.
Do not click links or open attachments unless you recognize the sender and
know the content is safe.
>
>
>
>
> I am attempting to run spectrometer_w_cal.grc. It fails and I get these
messages:
>
> Generating:
'/home/pi/gr-radio_astro/examples/DSPIRA/DSPIRA_Spectrometer.py'
> Executing: /usr/bin/python3 -u
/home/pi/gr-radio_astro/examples/DSPIRA/DSPIRA_Spectrometer.py
> Warning: failed to XInitThreads()
> Traceback (most recent call last):
> File "/home/pi/gr-radio_astro/examples/DSPIRA/DSPIRA_Spectrometer.py",
line 43, in
> import radio_astro
> ModuleNotFoundError: No module named 'radio_astro'
>
> Any suggestions on how to solve this problem would be appreciated!
> Tom
>
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Hi Tom,
Excellent news!
Enjoy your very own view of the Universe.
Take Care
Glen
Glen I Langston, Ph. D.
Galactic Astronomy Program Director
National Science Foundation
304-456-3032
… On Feb 5, 2022, at 7:08 PM, Tconsi ***@***.***> wrote:
Glen,
Thanks for the quick response and the info. I decided to install the
operating system with gnu radio and your telescope software already
installed. It worked like a charm!
My telescope is now outside gathering data.
Cheers!
Tom
On Sat, Feb 5, 2022 at 12:34 PM Glen Langston ***@***.***>
wrote:
> Hi Tom,
>
> It looks like you’re running this on a Raspberry Pi (good).
>
> Somehow the radio_astro code is not in your python path.
>
> Which version of the operating system do you have?
> (ie when did you get it?)
>
> It might be best to get the latest version, which is on a google drive.
> The installation guide is here:
>
>
> https://drive.google.com/file/d/1ssS_zBQWDEXMENc2_aqqPGxGkEEU5Ea3/view?usp=sharing
>
> The slightly newer operating system version is:
>
> https://drive.google.com/file/d/11H1g03-TW1jDbSlozNbuUKCPifASMEBF/view?usp=sharing
>
> With this version you should be logging in as
>
> radioastro (word: Aficionado)
>
> Glen
>
> Glen I Langston, Ph. D.
> Galactic Astronomy Program Director
> National Science Foundation
> 304-456-3032
>
> > On Feb 5, 2022, at 10:47 AM, Tconsi ***@***.***> wrote:
> >
> > This email originated from outside of the National Science Foundation.
> Do not click links or open attachments unless you recognize the sender and
> know the content is safe.
> >
> >
> >
> >
> > I am attempting to run spectrometer_w_cal.grc. It fails and I get these
> messages:
> >
> > Generating:
> '/home/pi/gr-radio_astro/examples/DSPIRA/DSPIRA_Spectrometer.py'
> > Executing: /usr/bin/python3 -u
> /home/pi/gr-radio_astro/examples/DSPIRA/DSPIRA_Spectrometer.py
> > Warning: failed to XInitThreads()
> > Traceback (most recent call last):
> > File "/home/pi/gr-radio_astro/examples/DSPIRA/DSPIRA_Spectrometer.py",
> line 43, in
> > import radio_astro
> > ModuleNotFoundError: No module named 'radio_astro'
> >
> > Any suggestions on how to solve this problem would be appreciated!
> > Tom
> >
> > —
> > Reply to this email directly, view it on GitHub, or unsubscribe.
> > Triage notifications on the go with GitHub Mobile for iOS or Android.
> > You are receiving this because you commented.
> >
>
> —
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> <https://github.com/WVURAIL/dspira-lessons/issues/7#issuecomment-1030665862>,
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Glen, I've been having a problem with spectrometer_w_cal.grc running on my Raspberry Pi 4 (8GB memory). I have the Raspbian build that you recommended which contains GNU radio and the DSPIRA program. I call the program from the GNU radio companion. It works fine and I can initialize parameters but the system locks-up when I try to return to the GNU radio companion, and after a minute or so I get a "system not responding" message. I have to select exit and then restart GNU radio companion. Any help would be appreciated, Tom |
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When I try to run the spectrometer_w_cal.grc program, it won't let me execute and the triangle button is grayed out. I think the problem is with the very first block, where I get an error that says 'ID "osmosdr_source_0" does not exist.' Can anyone help me understand what the problem is? I am very new to all of this. Thanks in advance. Evan |
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Hi Evan can you send us a screen shot of the flow graph with the error? And the first block. Is the block just red and showing an error or does it say “missing block” ?
Pranav Sanghavi
… On Aug 30, 2022, at 3:58 PM, ehalstea ***@***.***> wrote:
When I try to run the spectrometer_w_cal.grc program, it won't let me execute and the triangle button is grayed out. I think the problem is with the very first block, where I get an error that says 'ID "osmosdr_source_0" does not exist.' Can anyone help me understand what the problem is? I am very new to all of this. Thanks in advance.
Evan
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Thank you for the prompt reply! Here is a screenshot. It does say "missing block."
[cid:8e032cce-0936-4cf6-b71d-80e6f99e4556]
________________________________
From: Pranav Sanghavi ***@***.***>
Sent: Tuesday, August 30, 2022 6:12 PM
To: WVURAIL/dspira-lessons ***@***.***>
Cc: Evan Halstead ***@***.***>; Comment ***@***.***>
Subject: Re: [WVURAIL/dspira-lessons] dspira-lessons/forum/gnuradio/ (#7)
You don't often get email from ***@***.*** Learn why this is important<https://aka.ms/LearnAboutSenderIdentification>
Hi Evan can you send us a screen shot of the flow graph with the error? And the first block. Is the block just red and showing an error or does it say “missing block” ?
Pranav Sanghavi
On Aug 30, 2022, at 3:58 PM, ehalstea ***@***.***> wrote:
When I try to run the spectrometer_w_cal.grc program, it won't let me execute and the triangle button is grayed out. I think the problem is with the very first block, where I get an error that says 'ID "osmosdr_source_0" does not exist.' Can anyone help me understand what the problem is? I am very new to all of this. Thanks in advance.
Evan
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The length of actual antenna in the horn, if I fully understood what this means, is 57.2 cm. The length or the copper probe is 5.25. |
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Hello again, I use GnuRadio of the version 3.8.5. And answering your second question no, I cannot see the image that you've sent except of lightwork memo. I assume that everything is fine with spectrometer_w_cal. I set the rf gain 20 and others on 15(not as it was like 17, 12, 10) |
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This image shows the relative intensity of the Ground (Hot) compared with the colder intensity of the Sky. The ground should be between 2 and 4 times more intense than the sky. |
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Hi Helena,
Thanks for your quick reply. I’ve just updated GNuradio with the image showing the intensity difference between
Hot and cold observations.
This plot is based on a different design, but one that should be included with your download.
To add images, you have to login to Github to see the images attached to messages. Go to the bottom of web page:
https://github.com/WVURAIL/dspira-lessons/issues/7
You can login and add your comments, with pictures there too.
Best regards
Glen
PS I used “NsfIntegrate60.py” for my example which is in the gr-radio_astro/examples/nsf sub-directory
From: helena735 ***@***.***>
Sent: Monday, March 3, 2025 3:53 PM
To: WVURAIL/dspira-lessons ***@***.***>
Cc: Langston, Glen ***@***.***>; Comment ***@***.***>
Subject: [EXTERNAL] - Re: [WVURAIL/dspira-lessons] dspira-lessons/forum/gnuradio/ (#7)
This email originated from outside of the National Science Foundation. Do not click links or open attachments unless you recognize the sender and know the content is safe.
Hello again,
I use GnuRadio of the version 3.8.5. And answering your second question no, I cannot see the image that you've sent except of lightwork memo.
I assume that everything is fine with spectrometer_w_cal. I set the rf gain 20 and others on 15(not as it was like 17, 12, 10)
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[helena735]helena735 left a comment (WVURAIL/dspira-lessons#7)<https://github.com/WVURAIL/dspira-lessons/issues/7#issuecomment-2695509590>
Hello again,
I use GnuRadio of the version 3.8.5. And answering your second question no, I cannot see the image that you've sent except of lightwork memo.
I assume that everything is fine with spectrometer_w_cal. I set the rf gain 20 and others on 15(not as it was like 17, 12, 10)
—
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Hello, I've tested the radio telescope again with spectrometer_w_cal and sdr++, I've got something in sdr++(or that is just me who want to see something and actually didn't catch anything). Here are photos of an experiment. The problem is that the graph stay without changing even after moving antenna to the ground. Additionally, I have pictures of the horn telescope. Please say if you cannot see them, I will resend if something is wrong. Firstly, what can be a problem with static graph? I have a little(I hope) issue with running gnuradio-copmanion: NameError("name 'cpmmod_bc_make_gmskmod_bc' is not defined") on the terminal. Secondly, I tried to run sdr++ and found something(in pictures that a sent). Can it be a signal from galaxy(cuz when I move telescope to the ground the signal disappear) or that is just my fantasy? GnuRadio: sdr++: Thank you for help, |
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Here is the parts of radio telescope: |
0 replies
|
Hello Helena,
Thanks for all the pictures. We can see them when we click the links.
Your horn telescope looks great.
The software seems to be working too.
But there is no power going into your amplifier, so there is no signal.
That amplifier can not be powered by the bias tee, because there is a
capacitor blocking input voltage. Also the SDR produces +5V, but your
amplifier needs 9 to 12V, I think.
The spectrometer with cal program shows the input sample range , in the
upper right. This should have samples ranging between +/- .1.
Your samples are all near zero.
If you can purchase the Nooelec H1 amplifier, it will work better.
Or get a power supply for your amplifier.
So you are close, but need a few more parts.
Best wishes,
Glen
…On Tue, Mar 4, 2025 at 4:13 AM helena735 ***@***.***> wrote:
Here is the parts of radio telescope:
IMG_0414.pdf
<https://github.com/user-attachments/files/19067372/IMG_0414.pdf>
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Here is the parts of radio telescope:
IMG_0414.pdf
<https://github.com/user-attachments/files/19067372/IMG_0414.pdf>
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Hello again,
One more suggestion.
Attaching the amplifier directly to the feed probe will improve
sensitivity. The short cable will add a good bit of noise. There are
male-male SMA connectors, or a very short, but high quality cable, would
help.
Glen
…On Tue, Mar 4, 2025 at 4:11 AM helena735 ***@***.***> wrote:
Hello,
I've tested the radio telescope again with spectrometer_w_cal and sdr++,
I've got something in sdr++(or that is just me who want to see something
and actually didn't catch anything). Here are photos of an experiment. The
problem is that the graph stay without changing even after moving antenna
to the ground.
Additionally, I have pictures of the horn telescope. Please say if you
cannot see them, I will resend if something is wrong.
Firstly, what can be a problem with static graph? I have a little(I hope)
issue with running gnuradio-copmanion: NameError("name
'cpmmod_bc_make_gmskmod_bc' is not defined") on the terminal.
Is this error fatal?
Secondly, I tried to run sdr++ and found something(in pictures that a
sent). Can it be a signal from galaxy(cuz when I move telescope to the
ground the signal disappear) or that is just my fantasy?
GnuRadio:
Screenshot8.jpeg (view on web)
<https://github.com/user-attachments/assets/24a34b6f-c575-41ff-928e-1b914ccca18f>
Screenshot3.jpeg (view on web)
<https://github.com/user-attachments/assets/52840284-9d23-4daa-b606-6cc6fc855106>
Screenshot.2025-02-23.at.2.40.21.PM.png (view on web)
<https://github.com/user-attachments/assets/fab10976-c6fe-4c26-9a78-54b5a1b85c9b>
Screenshot4.jpeg (view on web)
<https://github.com/user-attachments/assets/311647a8-1936-48d4-bb4a-37fc01a786f2>
Screenshot5.jpeg (view on web)
<https://github.com/user-attachments/assets/9eb57745-e1d1-4dea-898f-54fa9507050c>
Screenshot6.jpeg (view on web)
<https://github.com/user-attachments/assets/ef8ea05d-f6a4-4c29-9937-e3fc044e75c4>
sdr++:
Screenshot1.jpeg (view on web)
<https://github.com/user-attachments/assets/554df86b-4d72-4331-b232-8ba5c47a96a4>
Screenshot2.jpeg (view on web)
<https://github.com/user-attachments/assets/725b5b61-513a-479d-9316-ca08168899a2>
Screenshot7.jpeg (view on web)
<https://github.com/user-attachments/assets/5bc9dbfe-76b8-4c5d-9e0d-d744d613f0d4>
Thank you for help,
Helen
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[image: helena735]*helena735* left a comment (WVURAIL/dspira-lessons#7)
<https://github.com/WVURAIL/dspira-lessons/issues/7#issuecomment-2696753684>
Hello,
I've tested the radio telescope again with spectrometer_w_cal and sdr++,
I've got something in sdr++(or that is just me who want to see something
and actually didn't catch anything). Here are photos of an experiment. The
problem is that the graph stay without changing even after moving antenna
to the ground.
Additionally, I have pictures of the horn telescope. Please say if you
cannot see them, I will resend if something is wrong.
Firstly, what can be a problem with static graph? I have a little(I hope)
issue with running gnuradio-copmanion: NameError("name
'cpmmod_bc_make_gmskmod_bc' is not defined") on the terminal.
Is this error fatal?
Secondly, I tried to run sdr++ and found something(in pictures that a
sent). Can it be a signal from galaxy(cuz when I move telescope to the
ground the signal disappear) or that is just my fantasy?
GnuRadio:
Screenshot8.jpeg (view on web)
<https://github.com/user-attachments/assets/24a34b6f-c575-41ff-928e-1b914ccca18f>
Screenshot3.jpeg (view on web)
<https://github.com/user-attachments/assets/52840284-9d23-4daa-b606-6cc6fc855106>
Screenshot.2025-02-23.at.2.40.21.PM.png (view on web)
<https://github.com/user-attachments/assets/fab10976-c6fe-4c26-9a78-54b5a1b85c9b>
Screenshot4.jpeg (view on web)
<https://github.com/user-attachments/assets/311647a8-1936-48d4-bb4a-37fc01a786f2>
Screenshot5.jpeg (view on web)
<https://github.com/user-attachments/assets/9eb57745-e1d1-4dea-898f-54fa9507050c>
Screenshot6.jpeg (view on web)
<https://github.com/user-attachments/assets/ef8ea05d-f6a4-4c29-9937-e3fc044e75c4>
sdr++:
Screenshot1.jpeg (view on web)
<https://github.com/user-attachments/assets/554df86b-4d72-4331-b232-8ba5c47a96a4>
Screenshot2.jpeg (view on web)
<https://github.com/user-attachments/assets/725b5b61-513a-479d-9316-ca08168899a2>
Screenshot7.jpeg (view on web)
<https://github.com/user-attachments/assets/5bc9dbfe-76b8-4c5d-9e0d-d744d613f0d4>
Thank you for help,
Helen
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Hello, Thank you so much for the help, I will try to correct all mistakes. Do you know other LNAs that will have the same functionality as Nooelec H1 amp(except of those which are in the DSPIRA list)? And another question, if I understood you, I have to purchase an LNA that can be powered by the bias tee and that is all? (do I have to buy bias tee itself?) And your second suggestion is to buy a power supply for an amp, thus, as I understand, I can keep my LNA and connect it to the power supply? Thank you for the last suggestion I will keep them close to each other. Helen |
0 replies
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Hi Helen,
You only need to do one of either power your current LNA with 12V or buy a NooElec HI amplifier, not
Both. The RTL SDR dongle already has a Bias Tee built in, so if you buy the NooElec HI amplifier, it should
work without needing another bias tee to power the amplifier.
I, and several others, have tested the system with the NooElec amplifier and RTLSDR dongle.
John Neal has the same RTL SDR dongle, but a dish antenna. He might have some suggestions too.
I’ve cc’d him.
Good Luck,
Glen
From: helena735 ***@***.***>
Sent: Tuesday, March 4, 2025 9:15 AM
To: WVURAIL/dspira-lessons ***@***.***>
Cc: Langston, Glen ***@***.***>; Comment ***@***.***>
Subject: [EXTERNAL] - Re: [WVURAIL/dspira-lessons] dspira-lessons/forum/gnuradio/ (#7)
This email originated from outside of the National Science Foundation. Do not click links or open attachments unless you recognize the sender and know the content is safe.
Hello,
Thank you so much for the help, I will try to correct all mistakes. Do you know other LNAs that will have the same functionality as Nooelec H1 amp(except of those which are in the DSPIRA list)? And another question, if I understood you, I have to purchase an LNA that can be powered by the bias tee and that is all? (do I have to buy bias tee itself?)
And your second suggestion is to buy a power supply for an amp, thus, as I understand, I can keep my LNA and connect it to the power supply?
Thank you for the last suggestion I will keep them close to each other.
Helen
—
Reply to this email directly, view it on GitHub<https://github.com/WVURAIL/dspira-lessons/issues/7#issuecomment-2697785383>, or unsubscribe<https://github.com/notifications/unsubscribe-auth/AADRXGBQZM5X4XMD6SK7MLT2SWYNVAVCNFSM6AAAAABUK2UECKVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDMOJXG44DKMZYGM>.
You are receiving this because you commented.Message ID: ***@***.******@***.***>>
[helena735]helena735 left a comment (WVURAIL/dspira-lessons#7)<https://github.com/WVURAIL/dspira-lessons/issues/7#issuecomment-2697785383>
Hello,
Thank you so much for the help, I will try to correct all mistakes. Do you know other LNAs that will have the same functionality as Nooelec H1 amp(except of those which are in the DSPIRA list)? And another question, if I understood you, I have to purchase an LNA that can be powered by the bias tee and that is all? (do I have to buy bias tee itself?)
And your second suggestion is to buy a power supply for an amp, thus, as I understand, I can keep my LNA and connect it to the power supply?
Thank you for the last suggestion I will keep them close to each other.
Helen
—
Reply to this email directly, view it on GitHub<https://github.com/WVURAIL/dspira-lessons/issues/7#issuecomment-2697785383>, or unsubscribe<https://github.com/notifications/unsubscribe-auth/AADRXGBQZM5X4XMD6SK7MLT2SWYNVAVCNFSM6AAAAABUK2UECKVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDMOJXG44DKMZYGM>.
You are receiving this because you commented.Message ID: ***@***.******@***.***>>
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Hello Glen, Thank you for clarifying. I understand now, I tried to receive knowledge about how to power LNA, which cannot provide that much voltage, if you have ideas how to do this, I would really appreciate it. Here is the picture of the LNA: All the best, |
0 replies
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Hello Helen and all of DSPIRA,
A lot of minor issues can be cleared up with a Zoom session.
I’m pretty busy this week, but next week, March 10-14,
I could zoom with anyone wanting to talk about their telescope
and setup.
I’m on the eastern time zone. Suggest a time that would
work for your schedule.
You could share your screen and show the symptoms of you system. Also,
I can show you one of my telescopes in action, using spectrometer_with_cal or
NsfIntegrate…
Please email me directly, if you want to Zoom.
Cheers
Glen
… On Mar 4, 2025, at 10:57 AM, helena735 ***@***.***> wrote:
Hello Glen,
Thank you for clarifying.
I understand now, I tried to receive knowledge about how to power LNA, which cannot provide that much voltage, if you have ideas how to do this, I would really appreciate it.
Here is the picture of the LNA:
IMG_0421.jpeg (view on web)
All the best,
Helen
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You are receiving this because you commented.Message ID: ***@***.***>
helena735 left a comment (WVURAIL/dspira-lessons#7)
Hello Glen,
Thank you for clarifying.
I understand now, I tried to receive knowledge about how to power LNA, which cannot provide that much voltage, if you have ideas how to do this, I would really appreciate it.
Here is the picture of the LNA:
IMG_0421.jpeg (view on web)
All the best,
Helen
—
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You are receiving this because you commented.Message ID: ***@***.***>
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Hi Helen / Glen As Glen mentions, I’m using the Nooelec SAWbird+H1 LNA located close to the antenna and I’m using the RTL-SDR Blog v3 SDR dongle connected to a Raspberry Pi 5 running Glen's (et al) software. The SAWbird+H1 requires just 5v and has a microUSB connector for that so I’m powering it via a good quality microUSB cable plugged into a USB power supply. You may also be able to power it (for a reasonable but finite length of time) with a good quality rechargeable USB ‘powerbank’. A power bank probably isn't viable for long drift scan runs though The above means I have BiasT turned off in the GNURadio configuration file; ie I have - I’m no electronics expert but was concerned about -
Hope that helps. |
0 replies
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Hello again Helen,
Several people have had some issues getting ready to start their
observations of the Milky Way.
So I’ve just added a video showing how to test that your amplifier is working.
This demo uses the Airspy mini and the Gnu-radio program NsfIntegrate60.py for
the test. This program is in the gr-radio_astro that you’re using.
However the procedure is the same for spectrometer_w_cal.py I’ll produce another version
soon showing how to do the test with the RTL-SDR dongle and spectrometer_w_cal.py
Here’s the link to the video: https://youtu.be/ErXdthZFUjY
Hope this helps.
Best regards
Glen
… On Mar 4, 2025, at 10:57 AM, helena735 ***@***.***> wrote:
Hello Glen,
Thank you for clarifying.
I understand now, I tried to receive knowledge about how to power LNA, which cannot provide that much voltage, if you have ideas how to do this, I would really appreciate it.
Here is the picture of the LNA:
IMG_0421.jpeg (view on web)
All the best,
Helen
—
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You are receiving this because you commented.Message ID: ***@***.***>
helena735 left a comment (WVURAIL/dspira-lessons#7)
Hello Glen,
Thank you for clarifying.
I understand now, I tried to receive knowledge about how to power LNA, which cannot provide that much voltage, if you have ideas how to do this, I would really appreciate it.
Here is the picture of the LNA:
IMG_0421.jpeg (view on web)
All the best,
Helen
—
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You are receiving this because you commented.Message ID: ***@***.***>
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Hi DSPIRA folks,
Hope you’re all doing well.
Terry and Barbara (of NRAO), have taken radio telescope building to a middle school in Loudoun county VA.
They provided materials to build 30 telescopes for the kids.
The pictures show the kids constructing the telescopes.
The link to the school newsletter is here:
https://www.lcps.org/article/2079882
Glen
|
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Discuss GNU Radio setup, flowgraphs, and troubleshooting.
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