r/radioastronomy

hello long time since last posted and yet we still havent detected a single hydrogen line

(we are using a horn antenna with aluminium tape, and a noolec sdr and lna ) before we bought the new sdr (the nooolec one) we were using rtl sdr v3 and there was a dc offset to strong after we changed to the noolec version there is no more dc offset peak but when i give the power to the lna the whole spectrums ground shakes and after background correcting still no hydrogen line

for lna the gain does go up when i turn it on and the amount is centered in 1420mhz so the amplification does work but cant understand why the ground shakes

i have seen many references that worked with the same things we have

At this point i really dont know what to do does anyone have an advice?? plz help

https://preview.redd.it/8cids8elmrah1.png?width=3024&format=png&auto=webp&s=1179a97925a1a4013d68f41fdb02980194b958d2

https://preview.redd.it/mpmkydipmrah1.png?width=783&format=png&auto=webp&s=30ec55e96b9b26fff7199008cd2a3ede00e0301c

https://preview.redd.it/59jm6gxvmrah1.png?width=3024&format=png&auto=webp&s=bcd07046242e5e497bfefdeeaf3682630bb57850

https://preview.redd.it/64nc8tnvnrah1.png?width=829&format=png&auto=webp&s=06b94361cdfcc67262d06c6391988734b32d31be

Good day.
As per being jobless for a few months, I want to step up my homelab. I would like to both :
- Listen to ADS-B broadcast emitted by nearby planes
- Perform meteoroid detection using the scattered radio reflection of the GRAVES radar (as I live in France)

However my apartment is not that great for antenna setup, and of course the ADS-B one will fit near a window, it might not be easy for the radio astronomy setup to listen to shooting stars reflecting an army radar waves :/

Do you know a simple antenna that could be set on a window pane that will work with the 143MHz GRAVES frequency ?
What SDR dongle would you recommend ? I suppose I also need an LNA, what specs ?

Thanks in advance.