Need help with my horn antenna

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Cathal O'Donghaile

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Apr 24, 2026, 3:14:04 AM (yesterday) Apr 24
to Society of Amateur Radio Astronomers
Good morning everyone

I hope we are all well. I need some help with my horn antenna to try and figure out what the problem is. I'm just not picking up the hydrogen line the way I used to and I cannot figure out what's wrong. 

So, I did have it working with the barebones LNA module last year up until one stormy night. I've been trying to repair it every since. I've managed to restore it back to the way it was and I'm now using the cased module to get readings, but just not getting any hydrogen line. I've attached photo's here of the antenna and readout from SDR Sharp. 

Would really appreciate suggestions and feedback.

Thanks, guys

Cathal
Screenshot 2026-04-23 182134.png20260423_145044.jpg
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Alex P

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Apr 24, 2026, 4:02:01 AM (yesterday) Apr 24
to Society of Amateur Radio Astronomers

Is the White Power Light on the LNA Illuminated ?

b alex pettit jr

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Apr 24, 2026, 4:12:32 AM (yesterday) Apr 24
to 'Alex P' via Society of Amateur Radio Astronomers
Or, Is the LNA  Input antenna wire Shorted to the Al foil ?


Cathal O'Donghaile

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Apr 24, 2026, 4:47:04 AM (yesterday) Apr 24
to Society of Amateur Radio Astronomers
Thanks, Alex! Yes, the LNA power is on but yes the F-Type connector was connected to the Al foil. I've stripped that away and I'm now running a test. Will let you know the result. 

Cathal O'Donghaile

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Apr 24, 2026, 6:45:42 AM (yesterday) Apr 24
to Society of Amateur Radio Astronomers
Screenshot 2026-04-24 112205.png
I think I'm back in business

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