Dear Ray,
I would run some tests on your RSP Duo to check it's accuracy and repeatability.? The Spectrum Analyser software for it can be downloaded from:??
Using a low-cost SDR for logging accurate RF power and SNR measurements can be found here:?
The SDR Console software has an on on screen signal strength logging graph the data from which can be exported to Excel etc.? The Air Spy software also has a logging function.
I check the calibration of mine using a -55 dBm output oscillator and check the settings for RF and IF gain.? If have found it to be accurate and repeatable.
There was an interesting page on the SDRC website about the S meter readings but I cannot find it, this is the nearest:
I use it for Medium Wave measurements, any questions please ask.
Sorry about the bold sections, BOLD stopped working after I copied the RS link.
73, Geoffrey.
