On 2/21/2012 8:26 AM, Joe Subich, W4TV wrote: > > On Mon, 2012-02-20 at 19:04 -0700, Tod - ID wrote: > > > > The important thing is to have a way to assure that when someone > > measured the same field at the same point with the same type of > > measurement device they would get the same measurement result. > > That would allow us to compare measurements between different > > people even if we did not know the absolute field strength value. > > I think simple, repeatable and accurate are a difficult triad. What > you are talking about is an accurate Field Intensity Meter (FIM) and > getting stable calibrations with home constructed equipment is not > going to be easy - let along easy to duplicate. The closest solution > is to use standard antennas (not simple whips) and calibrate them > against broadcast signals at known locations and known field strengths. > > This will still require separate antennas for 160 and 630 meters and > separate calibration sources on the appropriate ends of the standard > broadcast band (due to the antennas). > > 73, > > ... Joe, W4TV > > > _______________________________________________ > UR RST IS ... ... ..9 QSB QSB - hw? BK > It's been many years since I have had to make any AM broadcast field measurements. I don't recall if the Potomac Instruments, or other, FIMs go much below 550kHz.
73, -- Jack, W6NF Silver Springs, NV DM09ji _______________________________________________ UR RST IS ... ... ..9 QSB QSB - hw? BK