Robotron Pty Ltd G5P 用户手册

The WiNRADiO G3XX application contains a comprehensive set of scan 
functions to enable the user to search for stations which are currently on the 
air.  There are three basic types of scanning: Immediate Scanning 
(Searching), Range Scanning and Memory Scanning. The scanning method 
is selected using the appropriate button in the Scanning Control Panel: 

This is the simplest scanning method.  Click on the Search button to select 
this scanning mode, then use the [>>] or [<<] buttons to scan either forward or 
backward from the currently tuned frequency. To stop scanning, press the 
Stop button (marked with a green square). To pause, press the Pause button 
(marked with two vertical bars). 
 

 

 If you are using the Signal level type of squelch, then a signal is considered 
‘found’ when the signal level becomes higher than the squelch level. If you set 
the squelch level too low, scanning will stop even if there is no signal (the 
background noise peaks will exceed the squelch level). On the other hand, if 
the squelch level is set too high, then a useful signal may be missed because 
it will fall short of the squelch level. Correct setting of the squelch value is 
therefore essential for scanning. With a bit of trial and error, you will need to 
adjust the optimum setting for the squelch level (usually a few dB above the 
background noise floor).  

With Noise squelch (which is especially recommended for use in FM mode), 
the signal will be ‘found’ if the receiver finds a channel where the audio is less 
noisy, i.e. when the audio has been quietened by receiving an FM modulated 
signal and the noise level has fallen under the preset limit. The optimum 
setting varies, depending on the IF bandwidth (the wider the bandwidth, the 
higher will be the setting, because the noise on an unoccupied channel will be 
also stronger). 

 

 

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