21cm Dark Sky Test

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Alex P

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Jun 19, 2026, 7:39:09 AM (3 days ago) Jun 19
to Society of Amateur Radio Astronomers
21cm Dark Sky Test
Hardware/Software Eval :

Pettit 1m Circular Patch Feed Disk Yagi 
SDR#>IFavg>HL3D>Rinearn

Thought it would be interesting to examine the data in the dark RA12:00 portion of the sky .. surprisingly good results

Alex Pettit

Pettit_CPYV2_hardw-softw_Eval_RA1200.jpg

Ayushman Tripathi

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Jun 19, 2026, 9:11:18 PM (2 days ago) Jun 19
to Society of Amateur Radio Astronomers

Hi Alex,
Nice! I'll try to observe the same target later this month with my 2.4m and WiFi dish. Thanks

b alex pettit jr

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Jun 20, 2026, 7:51:40 AM (2 days ago) Jun 20
to sara...@googlegroups.com
Hi Ayushman,

I've plotted this region for 6 years, but always discarded it as it just verified I had no RFI nor system issues.
Inline image

It Is useful to additionally show the system noise RMS and sensitivity , 
and is part of every 24 hr drift scan  :)

Inline image


Alex
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