hi octavian, i don't know much about solar radio spectroscopy, but i think in some solar applications, the SNR is very high, and the time variability is slow enough that you could use a spectrometer with a small instantaneous bandwidth, perhaps 10 or 20 MHz bandwidth, and then sweep this spectrometer across your 800 MHz band. if that's the case, the spectrometer could be very inexpensive because you could use a GNUradio system.
if you need more instantaneous bandwidth, the red pitaya fpga board has two 125 Msps ADC's, and casper has a spectrometer tutorial for this board. you might be able to use the spectrometer tutorial design directly, or modify the design for your application. the red pitaya boards cost a few hundred dollars. https://www.redpitaya.com/f130/STEMlab-board the next step up would be to use a snap fpga board, which costs about $3000, and has four 950 Msps ADC's. casper has a spectrometer tutorial for the snap board as well. for even higher instantaneous bandwidth, there are several casper ADC boards you could plug into the snap board. eg: single 2 Gsps ADC board, a dual 2.5 Gsps ADC board.... information on the snap board, adc boards and tutorials are on the casper wiki pages. best wishes, dan Dan Werthimer Marilyn and Watson Alberts Chair Astronomy Dept and Space Sciences Lab University of California, Berkeley On Tue, Nov 12, 2019 at 1:27 AM Tavi B <[email protected]> wrote: > Hello, > > I'm new in this research, in Romania there is no scientific radio > telescope yet. I'm working at the Solar Group of Astronomical Institute of > Romanian Academy and this is the reason I would start with a solar radio > spectroscope, CALLISTO like station. I searched an inexpensive SDR to > emulate the callisto analog receiver but with fairly large bandwidth and > speed. The high end ones are too expensive and have many features that we > don't need like DAC, TX, filters and so on. > > I've learned that a 12bit ADC with high Mbsp and a FPGA can do the job, we > don't need to decode or demodulate a signal, just record the noise level > coming from the Sun (or other radio astronomy objects). In this search I've > found your group and I wonder if you can help me to find a really cheap > solution because we don't have a budget for this project right now. > > What modules I can buy or build myself (I have basic skills on > electronics, microcontrollers and radio) to get a spectrogram of 400 MHz > wide with a better than 0.1s time resolution? The Sun radio burst can be > received between 10-1500MHz but with different antennas, so I would start > with a log periodic dipole wide band antenna, from 120 to 800MHz. > > Thank you and best regards, > Octavian Blagoi > researcher > AIRA www.astro.ro > > -- > You received this message because you are subscribed to the Google Groups " > [email protected]" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To view this discussion on the web visit > https://groups.google.com/a/lists.berkeley.edu/d/msgid/casper/68ef8ced-7318-436d-b1fd-a96db187122f%40lists.berkeley.edu > <https://groups.google.com/a/lists.berkeley.edu/d/msgid/casper/68ef8ced-7318-436d-b1fd-a96db187122f%40lists.berkeley.edu?utm_medium=email&utm_source=footer> > . > -- You received this message because you are subscribed to the Google Groups "[email protected]" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/a/lists.berkeley.edu/d/msgid/casper/CAGHS_vErPR_vA3%2BTYvB2iVYAGZaR1g%3D7wPKwC93Z3S4Wt%2BO2eg%40mail.gmail.com.
