--- In [email protected], "Clive Lorton" <[EMAIL PROTECTED]> wrote: > > Could you answer one question please. In Winrad where does the > S meter normally idle when there is no audio input to the Delta 44?
Clive, in such case, and with a 500 Hz bandwidth, the S-meter hovers around S4, which, if referred to an RF signal over 50 ohm system impedance, would mean about 1.6 uV I started Winrad with the SDR-IQ (which doesn't use the sound card, but sends the data through the USB port) tuned to a quiet region of the RF spectrum, and the reading was almost the same. We should not be misled by the rice boxes (Icom-Yaesu-Kenwood) that show *NO* reading of the S-meter below a given threshold of the input signal. With a theoretical -73dBm over 50 ohm for S9, and 6dB per S-unit, a reading of S1 is about 0.2 uV, which normally is much lower than the band noise, except perhaps on the 10m band, in a quiet day. In a well behaved radio, with a proper S-meter, it should almost never be at zero, but always flicker around S1 - S2 or more on the sheer band noise. 73 Alberto I2PHD
