I am contemplating the idea of building myself a radio telescope from an old c-band big dish, with a computer-controlled azimuth/elevation control. The mechanical aspect of it will come later, for the moment I am more concerned about the main electronics...
First, the antenna will have a bandpass filter. I am interested in a 2.5MHz range centered at 1420MHz. I would prefer staying with fully analog design, because of the cost of the parts needed for an active filter... From there split into 8x 312KHz bands, then into 8 LNA inputs. Ideally I would like to then use these outputs to drive a 8-bits per band 8 bands VFD display.
Now I am not used at all with working at these frequencies with analog filters, are there any pitfalls I must avoid, or any suggestions on the design? I am still investigating this and putting ideas together, but I figure I will need a crapload of precision resistors and caps. Is there a way to design this filter digitally without spending a whole lot of money?
The 1420MHz center frequency is the frequency of radio emissions from superheated hydrogen in space BTW... ;)