Is there something similar to the zero-span of spectrum analyzers in gnuradio?
Best regards
Re: Is there something similar to the zero-span of spectrum analyzers in gnuradio?
Zero-span is the default way things work. There is no sweeping LO in a FFT-based display. On Mon, Dec 19, 2022 at 9:38 AM Juan Antonio wrote: > Best regards >
Release v3.10.5.0
GNU Radio v3.10.5.0 is available, for your end-of-year enjoyment. https://github.com/gnuradio/gnuradio/releases/tag/v3.10.5.0 In addition to fixes and under-the-hood work, the cross-platform experience should be helped out by some packaging, dependency and GRC drawing improvements. Happy GNU (Radio) Year!
Is there something similar to the zero-span of spectrum analyzers in gnuradio?
I must be very confused on this topic. I understood that the zero-span function in an analyzer meant that the span was reduced to the maximum and, from there, what you saw on the screen was the baseband in the time domain. I know I could try it with a filter with a few hertz of bandwidth but I can't really understand how filters work and that's why I was looking for a simpler method.
Re: Is there something similar to the zero-span of spectrum analyzers in gnuradio?
Just use a Qt GUI time sink with a complex to magnitude block ahead of it. Ron On 12/19/22 07:18, Juan Antonio wrote: I must be very confused on this topic. I understood that the zero-span function in an analyzer meant that the span was reduced to the maximum and, from there, what you saw on the screen was the baseband in the time domain. I know I could try it with a filter with a few hertz of bandwidth but I can't really understand how filters work and that's why I was looking for a simpler method.
Re: Is there something similar to the zero-span of spectrum analyzers in gnuradio?
I think I'm not explaining myself well again. What I want to see in the time domain is a single carrier of an 8mhz signal. That's why I was referring to the zero-span function of spectrum analyzers. I have tried to isolate a single 1K carrier using filters but I did not get good results. That is why I was looking for something simpler, where simply indicating the frequency, I would have the output that specific frequency in the time domain. Something like a very narrow band raw iq(or magnitude) demodulator
Re: Is there something similar to the zero-span of spectrum analyzers in gnuradio?
On 19/12/2022 10:50, Juan Antonio wrote: I think I'm not explaining myself well again. What I want to see in the time domain is a single carrier of an 8mhz signal. That's why I was referring to the zero-span function of spectrum analyzers. I have tried to isolate a single 1K carrier using filters but I did not get good results. That is why I was looking for something simpler, where simply indicating the frequency, I would have the output that specific frequency in the time domain. Something like a very narrow band raw iq(or magnitude) demodulator Isolating a 1KHz-wide signal from an 8MHz bandwidth in a single step is likely to create *enormous* filters. Do you really need to bring in 8MHz of bandwidth? If this were my problem, I'd use frequency-xlating-fft-filter to rotate the center of the desired carrier down to baseband, and then use a multi-stage filter-decimator chain to narrow the bandwidth. I've said this in both this forum and others in the past. Gnu Radio *IS NOT* a "radio with a lot of knobs to tweak", but a domain-specific software-development environment. It's somewhat rare in Gnu Radio for there to be a "button I can push to make my answers come out". What this means is that in order to be successful developing Gnu Radio flow-graphs to accomplish some specific task, there's usually some amount of background in signals, signal-processing, and software development required. Another things to consider is this: the field, loosely-described, as "useful and interesting things one might do at the intersection between radio and computers" is likely approaching infinite. Which means that no finite effort could ever possibly address each one of those useful and interesting things--some coding may be required. This same observation applies to the software universe in general, even ignoring SDR and DSP and the like...
