parameter value is too high), then too many characters of the other station’s transmission will be
missed, while we try to adjust to the speed of his sending. This can be particularly offensive in
some contest or pileup situations where exchanges are very short.
Ampl. Avg.
60
The decoder maintains an amplitude threshold, which it uses to decide whether a tone is detected
or not. The level of this threshold must be varied automatically in order to cope with stations
having a wide range of different signal strengths. Other perils may include QSB (signal fading) of
the station you are listening to. The amplitude threshold is implemented via an exponential moving
average. The weighting of each new sample (every 4ms) added to the accumulated exponential
moving average value is the reciprocal of this parameter.
If the exponential moving average is too fast (the parameter value is too low) then noise etc will
too easily throw off the amplitude threshold and it may take time to recover to its proper level. If
the exponential moving average is too slow (the parameter value is too high), then it may take too
long to adjust to the received station’s amplitude, resulting in missed characters while the decoder
slowly adjusts itself. It would also be too slow to automatically respond to QSB (signal fading).
Enable Rx
YES
An experienced CW operator may well dislike the CW decoder scrolling across the display all the
time. With this setting you can switch “Enable RX decode” to NO and the receiver decoding is
disabled.
Enable Tx
YES
With this setting you can switch “Enable TX decode” to NO and the transmit decoding is disabled.
When this setting is YES, the CW decoder will decode your own keying and display it on the
screen while you transmit. For an experienced CW operator that may be distracting too!
Enable edit
YES
QMX operang manual; rmware 1_00_012 26
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