21cm Hydrogen Drift Scan

[Dykes Cupstid]

Hardware:

1 meter Nooelec WiFi parabolic dish

Discovery (KrakenRF) Hydrogen Feed

RTL-SDR V3

Software:

Airspy Studio SDR#

IF Average plugin

IFAve2CSV

Rinearn Graph3D

[Alex P]

Very Well Done !

Congratulations 

[b alex pettit jr]

Please post a larger photo 

[Dykes Cupstid]

In Windows I right click on the photo and open it in another tab and it is much larger. I attached it as a file here. Maybe that will help.

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From: 'b alex pettit jr' via Society of Amateur Radio Astronomers <sara...@googlegroups.com>
Sent: Friday, March 20, 2026 11:08 AM
To: 'Alex P' via Society of Amateur Radio Astronomers <sara...@googlegroups.com>
Subject: Re: [SARA] Re: 21cm Hydrogen Drift Scan

 

Please post a larger photo 

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[b alex pettit jr]

Yes  and Thanks.

RFI Noise Free .

What is the time per average you are using ?

[Dykes Cupstid]

The time stamps on the IF Average plugin files are 4 minutes apart.

---

From: 'b alex pettit jr' via Society of Amateur Radio Astronomers <sara...@googlegroups.com>
Sent: Friday, March 20, 2026 1:44 PM
To: 'Dykes Cupstid' via Society of Amateur Radio Astronomers <sara...@googlegroups.com>

Subject: Re: [SARA] Re: 21cm Hydrogen Drift Scan

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[b alex pettit jr]

Hi Dykes,

Attached are a few *.ini files for Rinearn 3D ..

I changed the color map on "Standard_Z_View" to deepen the background colors ..

Alex

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[b alex pettit jr]

If that did not post, Here is the link to the *.ini Files

HLine3D/Rinearn3D_QuickSettings02.docx at main · AP-HLine-3D/HLine3D

HLine3D/Rinearn3D_QuickSettings02.docx at main · AP-HLine-3D/HLine3D Beginners Low Cost 21cm Radio Telescope Project b.alex.pettit.jr. - AP-HLine-3D/HLine3D

[Dykes Cupstid]

Thanks Alex. Link will be useful as I try to improve my work. Do you by any chance have a comparison of plots of the same area made from data obtained using a 1 meter dish and a 2 or 3 meter dish?  I'd like to get a feel for the definition difference a larger dish could potentially produce.

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From: 'b alex pettit jr' via Society of Amateur Radio Astronomers <sara...@googlegroups.com>

Sent: Friday, March 20, 2026 2:25 PM

To: 'Dykes Cupstid' via Society of Amateur Radio Astronomers <sara...@googlegroups.com>
Subject: Re: [SARA] Re: 21cm Hydrogen Drift Scan

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[b alex pettit jr]

I'll  have to dig through some data.. 

BUT, Here is data processed via  SDR#>IFavg>HL3D > Matlab for Graphics

from a 12 meter (!) dish.  

 ( 54 hrs of acquisition )   Declination + 30 Degrees

Repeatability 

Alex

[Dykes Cupstid]

Updated plot with, hopefully, correct peak ID

[b alex pettit jr]

Now, try drift-scan slices at other Declinations. 

You should be able to see small differences in even 5 deg Dec shifts.

- Alex