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Not really worth it when there are countless RTL-SDR dongle projects that allow you to do this already on the cheap.
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On Tuesday, March 10, 2020, 9:49:26 a.m. GMT-4, nanovnauser@... <nanovnauser@...> wrote:
is there any plans to make a spectrum analyser along the same lines as the nanovna?,seems to me it would be a winner. |
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Although, thinking about this a little more - there IS alot more space for enhanced firmware on the new V2 board which uses Analog Devices freq generator chips so additional functionality -might- be able to be developed for a spectrum analyser feature using the input port.The problem is the dynamic range and how to control input levels.
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What do you think, Gabriel? It would also be nice to have an option to flip the display 180 degrees. Cheers,Larry On Tuesday, March 10, 2020, 9:55:20 a.m. GMT-4, Larry Rothman <nlroth@...> wrote:
Not really worth it when there are countless RTL-SDR dongle projects that allow you to do this already on the cheap. ? ? On Tuesday, March 10, 2020, 9:49:26 a.m. GMT-4, nanovnauser@... <nanovnauser@...> wrote:? is there any plans to make a spectrum analyser along the same lines as the nanovna?,seems to me it would be a winner. |
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A decent spectrum analyzer would need good image frequency (and spurs) suppression. And it would need a much faster ADC because a 5 or 10 KHz bandwidth is way too low to be useful. I need a real time spectrum analyzer that can capture at least 10 MHz of spectrum at once. In essence, a spectrum analyzer is more complicated than a vna. However, they have quite some hardware in common. It is on my wish list to design a decent 6 GHz VNA/SA combi, not a cost optimized VNA "toy" like all nanoVNA versions. But the wish list grows faster than I can handle...
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Reinier Op 10-3-2020 om 15:08 schreef Larry Rothman: Although, thinking about this a little more - there IS alot more space for enhanced firmware on the new V2 board which uses Analog Devices freq generator chips so additional functionality -might- be able to be developed for a spectrum analyser feature using the input port.The problem is the dynamic range and how to control input levels. |
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If you want a low cost spectrum analyzer (SA) that goes from a few kHz to 2 GHz. buy an SDRplay RSP1A SDR receiver for around $100 US. Then download the free Spectrum Analyzer program, written by a 3rd party, from the SDRplay downloads section. This program has a lot of standard SA features but you will need some good attenuators because the RSP1A needs to have a maximum signal input below 0 dBm.
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Roger Need