3/23/2023 0 Comments Radio telescope![]() ![]() Be sure to get one that emits a sound when the antenna receives a strong signal this makes it easier to demonstrate the device to large groups of students since everyone will be able to hear the signal. This tells us whether the LNB is receiving a signal, and if so, how strong it is. The price of a new downconverter is approximately 40 zł (€10), but they can be bought second-hand for a fraction of the price. Any brand or model will work fine, even the cheapest. In your radio telescope, the LNB will be the receiver that detects the radio waves reflected by the dish. When we watch TV, the LNB receives and amplifies the signal, strips out unwanted frequencies and then converts the signal to a lower frequency. A low noise block downconverter, or LNB LNBs are an essential part of satellite TV receivers, and sit at the point where the dish focuses incoming rays.The employee at the shop or scrap yard will probably be happy to remove it for you. If the satellite dish has a mount, remove it (figure 1), as it just adds weight and makes it harder to move. You can also search at scrap metal yards – this is where I found mine. ![]() A used dish should cost no more than 12-20 zł (€3-5). A new dish costs approximately 100 zł (€24). The dish can be of offset or parabolic type. I recommend one with a diameter of at least 1 m. ![]() In your radio telescope, the dish will serve a similar purpose: it will reflect the relatively faint radio waves onto the receiver.
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