72639Re: [softrock40] Re: Ensemble RX II noisy and not sensitive
- Mar 7, 2013Notice about S meter calibration:
The Softrock Ensemble RX has 14 dB pads in series with the 2 lower
bands. It purpose has been explained here, but as far as I know no any
SDR software takes account of this, so if you calibrate in any of those
bands, the S meter will indicate more than 2 S units high in the upper
bands and the opposite will happen if you calibrate in the two upper
bands. Since most S figures are relative indications it only has
importance if you use the receiver for making measurements.
73 de Ignacio, EB4APL
On 04/03/2013 9:16, Alan wrote
> ----- Original Message -----
> Subject: [softrock40] Re: Ensemble RX II noisy and not sensitive
> > Maybe Alan or someone else can explain the S meter noise level
> indication in HDSDR. It has always been a mystery to me and I have
> > not taken the time to figure it out.
> You mean that thing that jiggles about at centre left?
> No, I do not pay much attention to that.
> As I've said I really do not think indicated signal strengths matter for
> normal reception.
> But for technical purposes the calibrated spectrum is far better than
> the HDSDR "S" meter. Especially when you discover the controls
> to zoom the scale. Some other SDR programs probably have a better meter.
> You should be admiring the way a simple SDR works compared with other
> You have not said if the 10m vertical is your only antenna. A Softrock
> will probably not work very well on lower frequencies with
> 73 Alan G4ZFQ
> > Yes -73 dBm should be set to correspond to S9. I recommend however
> you set it by placing the signal peak on the spectrum display
> > at -73 there. If you expand the vertical you can get 1 dB resolution
> on this scale and then all other signal levels, including the
> > noise floor, can be accurately read from the Spectrum display. I use
> the S meter only as a quick visual reference and do all of my
> > measurement using the spectrum display.
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