Small Radio Telescope

Feed:
The radio telescope realizes the observation of celestial bodies through neutral hydrogen radiation of 21cm, and its frequency is 1420.4MHz[3]. The copper-attached side of the circuit board is inward, which reflects the electromagnetic radiation from the rectangular opening ( port1) to the antenna. The antenna is connected to port 2, and the impedance of the latter is 50 ohms. The specification of the feed is 150*100*100mm.

Surface: Cut the rain-proof cloth into four sides of the required reflecting surface (corresponding prism), use silver-plated stickers to glue the four sides into reflecting surfaces, cover the inner surface of the reflecting surface with silver-plated stickers, and punch holes in the four sides near the upper and lower bottom surfaces to connect with the bracket and the feed through screws and nuts. The inner surface of the silver-plated sticker-covered reflecting surface should be as smooth as possible so that the majority of electromagnetic radiation can be routed to the feed.

Structure:

Four L-shaped bars with holes of 80cm, 9 L-shaped bars with holes of 75cm and 6 L-shaped bars with holes of about 30cm are needed. There are several L-shaped bars with matching screws and nuts. The longer two types of L-shaped bars are mainly used to make the support itself, the shorter one is mainly used to reinforce the support, and the remaining L-shaped bars with specifications of 75 cm and 30cm are used to make the support. The support can be divided into three parts: the bottom platform, the left side and the right side.

Observation:

In practice, the sampling parameters are set, and the radiation intensity is taken as the baseline when it is not aligned with the celestial body, and then it is aligned with the target celestial body, and the data is recorded, yielding the relative radiation intensity-frequency diagram of neutral hydrogen 21cm radiation.