A COMPACT RADIO TELESCOPE FOR THE 21CM NEUTRAL-HYDROGEN LINE Tadeja Saje, Matjaž Vidmar Abstract Thanks to the many independent
![Hydrogen Line telescope made by a HS teacher and former student. There are some great assembly guides out there, but we also created a document gathering horn dimensions, amplification setup, calculations, etc. Hydrogen Line telescope made by a HS teacher and former student. There are some great assembly guides out there, but we also created a document gathering horn dimensions, amplification setup, calculations, etc.](https://i.redd.it/f90hv59850o31.jpg)
Hydrogen Line telescope made by a HS teacher and former student. There are some great assembly guides out there, but we also created a document gathering horn dimensions, amplification setup, calculations, etc.
![Cheap and Easy Hydrogen Line Radio Astronomy with an RTL-SDR, WiFi Parabolic Grid Dish, LNA and SDRSharp Cheap and Easy Hydrogen Line Radio Astronomy with an RTL-SDR, WiFi Parabolic Grid Dish, LNA and SDRSharp](https://www.rtl-sdr.com/wp-content/uploads/2020/01/Wifi_grid_photo_ra2.jpg)
Cheap and Easy Hydrogen Line Radio Astronomy with an RTL-SDR, WiFi Parabolic Grid Dish, LNA and SDRSharp
![My holiday project was to make a cheap hydrogen line radio telescope from a wifi antenna and a Raspberry Pi : r/space My holiday project was to make a cheap hydrogen line radio telescope from a wifi antenna and a Raspberry Pi : r/space](https://external-preview.redd.it/YyboKtUcdjRtuR_pWa3CPem6-L04ARrawby8VfPBt4Y.png?width=640&crop=smart&format=pjpg&auto=webp&s=e20435b4f5fdd29fce025f4299ff92893d431d20)
My holiday project was to make a cheap hydrogen line radio telescope from a wifi antenna and a Raspberry Pi : r/space
![Observing the 21cm Hydrogen Line (HI) radio emissions from the Milky Way with a DIY Radio Telescope - YouTube Observing the 21cm Hydrogen Line (HI) radio emissions from the Milky Way with a DIY Radio Telescope - YouTube](https://i.ytimg.com/vi/Y1N-_HOpQNo/maxresdefault.jpg)
Observing the 21cm Hydrogen Line (HI) radio emissions from the Milky Way with a DIY Radio Telescope - YouTube
![Cheap and Easy Hydrogen Line Radio Astronomy with an RTL-SDR, WiFi Parabolic Grid Dish, LNA and SDRSharp Cheap and Easy Hydrogen Line Radio Astronomy with an RTL-SDR, WiFi Parabolic Grid Dish, LNA and SDRSharp](https://www.rtl-sdr.com/wp-content/uploads/2020/01/milky_way_rtl_sawb.jpg)