I'd prefer closer to 1Hz here, the ETSI standard allows beacons to be anywh= ere from 456.920 to 457.080 -- David VanHorn Lead Hardware Engineer Backcountry Access, Inc. 2820 Wilderness Pl, Unit H Boulder, CO =A080301 USA phone:=A0303-417-1345 =A0x110 email:=A0david.vanhorn@backcountryaccess.com=A0 -----Original Message----- From: piclist-bounces@mit.edu On Behalf Of Brent = Brown Sent: Tuesday, September 17, 2019 6:28 PM To: Microcontroller discussion list - Public. Subject: Re: [EE] Simple spectrum analyzer 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, ba= sic 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 centered = on 457kHz.=20 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 n= ot quite the resolution you are looking for. --=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 .