Hi, I am following a very simple procedure described some time ago by Bob, N4HY in the old FlexRadio forum. I am measuring the noise power in 500 Hz bandwidth, the antenna input terminated by 50 ohms. This is the MDS because a signal of equal power will increase the level by 3 dB. I am using Duncans KGKSDR to determine the power in 500 Hz bandwidth. The software is calibrated for each band. A Rohde&Schwarz signal generator is used for the calibration.
73 Bodo, DJ9CS --- In [email protected], "Alan" <[EMAIL PROTECTED]> wrote: > > > ----- Original Message ----- > From: "ad9850" > > > > sorry I forgot to mention this. I followed the more or less standard > > of 500 Hz bandwith. > > > > There was an article in the RSGB magazine recently that said MDS is not a > substitute for NF (Noise Factor) but the concept of Minimum Detectable > Signal seems easier to understand. > I can make an approximate reading of the smallest signal I can receive but > how do I know what bandwidth I am looking at? > I can do it by ear or by looking at a waterfall, I will get vastly different > results. By ear I may be using a 500Hz filter, by using a waterfall I could > be looking at a fraction of a Hz. > Under what conditions are these measurements made? > > 73 Alan G4ZFQ >
