PRO-20-(Operating-Guide操作说明书手册)

PRO-20 Receiver(200-0101)OperationAfter batteries,crystal(s)and antenna (telescopic or flexible)havebeeninstalled,your PRO-20 is ready to use.Turn Power "on"by rotating VOLUME to the right.Rotate SQUELCH totheminimum position by rotating to the left.Set all the Channel Lock-outSwitches "on"(in the up position,toward the LED indicators).Youshouldhear a rushing sound from the speaker.Rotate SQUELCH toward therightuntil the background noise abruptly stops.You can't adjust SQUELCHproperly while listening to a station,so wait until signals cease.If youset SQUELCH correctly,the PRO-20 will appear "dead"until a signalcomesin;when a signal comes in,the Squelch circuit will "open up"andyou'11hear the signal.When the signal ceases,the Squelch circuit will"close"and cut out all sound until the next signal comes in.If you want the PRO-20 to continuously scan the channels for whichyou havecrystals installed,you must adjust SQUELCH as previously instructed,thenset the Selector Switch to the SCAN position.The PRO-20 willconstantlyscan each channel in sequence;when a signal appears on one of thechannelsthe receiver will lock onto that channel and you will hear thesignal.If you do not want automatic scanning on one or more channels,switchtheirChannel Lock-out Switches to the "off"position (down or away fromtheLED indicator).If you want to stay tuned to one channel only,set the SelectorSwitch tothe center position (stop scanning)and then press to the MANUALpositionmomentarily to advance to the channel you want to listen to (asindicatedby the LED above that channel switch).For MANUAL scanning,thereceivercan be either "squelched"(adjusted as previously indicated)or"unsquelched"(SQUELCH control set to extreme left).For AUTOMATICscanning,SQUELCH must be set to eliminate the background noise.MAXIMUM SENSITIVITY RANGEThis Receiver will function very accurately down to 30 and up to 50and