Thank-you Alberto and Alan for your helpful suggestions on FS measurement.
It appears as I'm getting consistent results within 0.5 dB on
a relative scale at least.

73
Joe VO1NA

On Mon, 14 May 2007, Alberto di Bene wrote:

> Joe Craig wrote:
> >
> > I suspect that ARGO may reference its readings against the background
> > noise and not be absolute.  Running 1000 watts (4.5 amps) to 100m of
> > wire up 10 m showed a 3 dB advantage over the previous system: 100 watts
> > to a sloping 100m wire  with the far end up 25 metres.
> >
>
>    The dBs reported by Argo are relative to the full scale of the ADC 
> converter of the sound card, 0 dB being its
> saturation level, and so on. Of course that reading is influenced by the 
> position of the level slider in the mixer panel
> of Windows, and by the setting of the volume knob of the radio...
>
> 73  Alberto  I2PHD
>
>
>