Click on link below to download Alex Pettit’s PDF document on dark frame correction options in hydrogen line radio astronomy for amateurs. https://www.astronomy.me.uk/wp-content/uploads/2026/01/Alex-Pettit-Dark-Frame-Correction-v04-141125.pdf Post navigation Principals of design of geodesic radio dish Plan and measurements of proposed LRO Hydrogen Line Horn Antenna 14/1/2026
