Robotron Pty Ltd G5P 用户手册
WiNRADiO G3XX VHF/UHF Receiver
The Band-pass and Low-pass buttons make it possible to select the desired
type of filter. The filter cut-off frequencies can be either entered numerically, or
the filter edges can be dragged with the mouse. For the band-pass filter, the
entire passband may be shifted left or right by dragging the top horizontal red
line.
type of filter. The filter cut-off frequencies can be either entered numerically, or
the filter edges can be dragged with the mouse. For the band-pass filter, the
entire passband may be shifted left or right by dragging the top horizontal red
line.
With a band-pass filter, suitable low and high cut off values for good
intelligibility of voice communications are 300 and 3000 Hz, respectively.
intelligibility of voice communications are 300 and 3000 Hz, respectively.
De-emphasis is usually necessary for FM demodulation only. The typical
value is -6dB/octave.
value is -6dB/octave.
Noise Blanker
The Noise Blanker is effective for random high-level noise
spikes, such as atmospherics.
spikes, such as atmospherics.
The Noise Blanker is activated by pressing the Blanker button.
If the instantaneous IF signal level exceeds the specified
Threshold level, those IF samples are replaced with older ones. The threshold
level is set as a relative value, a percentage of the maximum possible sample
level.
If the instantaneous IF signal level exceeds the specified
Threshold level, those IF samples are replaced with older ones. The threshold
level is set as a relative value, a percentage of the maximum possible sample
level.
Receiver Incremental Tuning (RIT)
In some other receivers, this is also referred to as the Clarifier. This function is
used exclusively for SSB (USB or LSB) modes. It is not available, nor
necessary, for other modulation modes.
used exclusively for SSB (USB or LSB) modes. It is not available, nor
necessary, for other modulation modes.
In effect this is a VFO for IF shift; a short-term memory for IF shift.
If two communicating SSB stations are not exactly on the same frequency,
listening to them may need an adjustment for one of the frequencies,
otherwise one of the stations might sound distorted. To spare you from having
to quickly tune to the new frequency while listening to the dialogue, the RIT
function makes it possible to conveniently adjust the frequency increment by
simply engaging or disengaging the RIT button.
listening to them may need an adjustment for one of the frequencies,
otherwise one of the stations might sound distorted. To spare you from having
to quickly tune to the new frequency while listening to the dialogue, the RIT
function makes it possible to conveniently adjust the frequency increment by
simply engaging or disengaging the RIT button.
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