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I'm not aware of any way to go that far down in RBW (but I would be delighted to be proven wrong!), not to mention the waveform on the display will have a flat top that makes finding the exact peak a judgement call.

When I need very small RBW I just use an SDR (even a cheap $25 one like an RTL-SDR dongle), along with a program like HDSDR, which will get you RBW values down to 0.1 Hz.

No. Resolution bandwidth is determined in the main chip, and it only has a certain number of RBWs available.? The filters are implemented in firmware internal to the chip.? I think 2.7 kHz, or 3 kHz, something like that, is the lowest RBW available.

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On Thu, Feb 4, 2021 at 01:36 PM, waltcates wrote:

Is there any way to get the RBW down to 200Hz with a center freq of 3.9MHz and a scan width of 8KHz?

Keep it simple please.

Not on the TinySA.?

But if you want a low cost solution use an SDRplay RSP1A and the free Spectrum Analyzer program that was written for it.? A little over $100 USD

Roger

On Thu, Feb 4, 2021 at 04:45 PM, waltcates wrote:

I have a DSA705 on the way.

Good for you!? Spectrum analyzers are wonderful toys to have.? I have a Siglent SSA3021X spectrum analyzer here, which I really like. I also have a Siglent SDS1104X-E oscilloscope that will do FFTs so it can be used as a spectrum analyzer, too.? It's only a 100 MHz scope, but since it samples at 1 GHz, it will play spectrum analyzer quite a bit higher than that.? (Not really convenient to use as a spectrum analyzer, but usable.)? I think the highest I have ever displayed on it is about 250 MHz.? I have been looking out for an old HP or Tek spectrum analyzer that will go up to 20 GHz or thereabouts, but with the virus going around, all the hamfests have been canceled, so that will probably have to wait.? And of course I have 3 tinySAs here!