I was also going to suggest the rtl-sdr based ones, but they apparently only go down to 500kHz. But I agree, there are lots of SDR's out there for not a lot of money, and most of them have open source spectrum analyzer tools which one could modify to fit the 'ease of use' needs. You could conceivably provide a USB dongle and a bundled piece of PC software which would do the spectrum analysis piece. If you're really bored you could probably include some data/protocol decoders as well if this is a data radio you're looking at..... On Tue, Sep 17, 2019 at 6:39 PM Brent Brown wrote: > David Van Horn wrote: > > I need a recommendation for a simple SA, to be used by non-engineers. > > Resolution of about 1Hz, and accuracy of 1ppM or less. > > The frequency of interest is a 200 Hz slice around 457kHz > > Perhaps an SDR? PC can use preset config to hide all/most controls and > just show > what's required. I have one of the following, covers 1kHZ to 2GHz, basic > accuracy > 0.5ppm & trimmable, USD169: https://www.sdrplay.com/rsp2/ > The RSP1A has fewer inputs but otherwise similar specs for USD109. > > Just for fun I tried it here, approx 456.9kHz signal with display centere= d > on 457kHz. > Attached image, if small enough to be make it through. The minimum > sampling BW > is 1MHz, so zoomed to the max only shows divisions of 10Hz... perhaps not > quite > the resolution you are looking for. > > -- > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > --=20 - Forrest --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .