Winradio G315, Руководство пользователя

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WiNRADiO G315 User’s Manual
57
The Avg button, when activated, shows the S-meter level value as a floating
average within the preset time interval (settable from 1 to 99 seconds). This is
used to smooth the
S-meter movements. Any change which may affect the
S-meter value (such as tuning the receiver to a new frequency or changing the
attenuator setting), resets the averaging interval, so that the S-meter may
react immediately to such change.
Note: The S-meter relies on the AGC for its proper operation. Therefore, if the
AGC is switched off and manual IF gain is used instead, the S-meter is also
disabled.
Did you know?
There are no exact definitions for S-units, merely recommendations.
Historically, the S-units referred to subjectively perceived signal strength as
follows:
S1… faint signals, barely perceptible
S2… very weak signals
S3… weak signals
S4… fair signals
S5… fairly good signals
S6… good signals
S7 …moderately strong signals
S8 …strong signals
S9… extremely strong signals
Nowadays, most manufacturers, including WiNRADiO, usually implement the
ARRL recommendation where the S-units are spaced 6 dB apart and S9
corresponds to 50 µV at a 50 ohm antenna input, or -73 dBm (on HF bands).