Thank you Chuck, this is what was missing. At least, these are the numbers that were missing to calculate SNR ourselves. I take it this applies to both the AF5 and the RocketAC radios or are their noise floor estimates be different since they are different chipsets?
-Ty On Tue, Jan 13, 2015 at 9:06 AM, Chuck Macenski <ch...@macenski.com> wrote: > Hi, > > I should learn to sleep at night and email during the day. The tl;dr > should have read: Sensitivity for a Modulation Rate at a given bandwidth > (from the spec sheet) minus the clean noise floor for that bandwidth (see > below) equals the signal needed over the actual noise floor for a given > modulation. > > A rough estimate for the clean noise floor would be (50MHz=-97dBm, > 40=-98dBm, 30=-99dBm, 20=-101dBm, 10=-104dBm). > > Chuck > > On Tue, Jan 13, 2015 at 8:39 AM, Chuck McCown <ch...@wbmfg.com> wrote: > >> Noodling around with Chucks info: >> >> Noise floor = –80 >> Sensitivity = –82 >> -80 – (-82) = 2 dB >> RX signal required –80 + 2 = –78 dBm >> >> Noise floor = –40 >> Sensitivity = –82 >> -40 – (-82) =42 dB >> -40 + 42 = +2dBm (Not sure I want to stand in front of the transmitter) >> >> Some simple algebra: >> >> Required RX signal =Noise floor + (Noise Floor – Sensitivity) >> >> - simplifying - >> >> RX signal = (2 * Noise floor )-Sensitivity >> >> So, every dB of noise floor == 2dB of RX signal. >> >> Have I got this right Chuck? >> >> *From:* Chuck Macenski <ch...@macenski.com> >> *Sent:* Monday, January 12, 2015 11:25 PM >> *To:* af@afmug.com >> *Subject:* Re: [AFMUG] Af5 >> >> >> tl;dr...the natural noise floor for the band minus the sensitivity of >> that band for a given modulation equals the signal needed over the noise >> floor for a given modulation. >> >> > >
