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== Operation ==SETTING THE VOLUME AND SQUELCH CONTROLSRotate VOLUME clockwise and SQUELCH counterclockwise until you hear ahissing sound. Then, slowly rotate SQUELCH clockwise until the noisestops. Set VOLUME to a comfortable level.If the scanner picks up unwanted weak transmissions, rotate SQUELCHclockwise to decrease the scanner's sensitivity to signals.USING THE KEY LOCKOnce you program the scanner, you can protect it from accidental programchanges by moving the lock SWITCH to IN. In this position, the onlycontrols that operate are VOLUME, SQUELCH, MANUAL, and SCAN.When you want to change the scanner's programming, move the LOCK switch toOUT.PROGRAMMING THE SCANNERFollow these steps to store frequencies in channels.1. Select a channel to program by pressing MANUAL, entering the channel number you want to program, and pressing MANUAL.2. Enter a frequency. To enter the decimal, press ./CLEAR. The decimal point is displayed as a dash (-) on the display.3. Press ENTER to store the frequency. If you made a mistake in Step 2, E appears on the display. Press ./CLEAR twice and repeat Step 2.4. To confirm the proper entry, press REVIEW. The programmed frequency appears on the display, one digit at a time.5. To program more channels, repeat Steps 1 to 3. If you want to program the next channel in sequence, simply press MANUAL and repeat Steps 2-4.Tips for ProgrammingA good reference for active frequencies is Radio Shack's Police CallDirectory including Fire and Emergency Services.We update this directory every year, so be sure to get a current copy.Frequencies in the VHF bands are in 5 kHz steps. In the UHF bands, theyare in 12.5 kHz steps. The scanner automatically rounds the frequency tothe nearest valid number. For example, if you try to enter a frequency of151.373, your scanner accepts it as 151.475.SCANNING THE CHANNELSTo begin scanning the channels, press SCAN. The scanner scans through allthe channels except the ones you have locked out. Be sure to read thefollowing sections to get the full benefit from the scanner's specialfeatures.LOCKING OUT CHANNELSYou can make the scanner scan more efficiently by locking out channelsthat you have not programmed. Enter the channel number you wish to lockout, press MANUAL and then press LOCK OUT so that the LOCK OUT indicatorlights. This is also handy for locking out channels that have acontinuous transmission. You can still manually select locked outchannels for listening.To unlock a channel you have locked, manually select the channel and pressLOCK OUT so that the LOCK OUT indicator goes off.MANUALLY SELECTING A CHANNELYou can continuously monitor a single channel without scanning. This isuseful if you hear an emergency broadcast on a channel and do not want tomiss any of the details - even though there might be periods ofsilence - or if you want to monitor a channel that you have locked out.To select a channel to monitor, press MANUAL and advance through thechannels by pressing MANUAL repeatedly, or move directly to a channel byentering the channel number on the keypad then pressing MANUAL. If thescanner is scanning and has stopped at the desired channel, press MANUALone time.AUTOMATIC SCAN DELAYThe scanner stops when it finds a signal. It begins scanning otherchannels about 3 seconds after the signal ends. The 3-second delay givesyou a chance to receive a reply to the first signal.A GENERAL GUIDE TO SCANNINGBIRDIESBirdies are the products of internally generated signals that make somefrequencies difficult or impossible to receive. If you program one ofthese frequencies, you hear only noise on that frequency.If the interference is not severe, you might be able to cut out the birdieby turning the squelch control clockwise. The most common birdies towatch for are listed below. 30.300 MHz 31.200 MHz 32.500 MHz 41.600 MHz 52.000 MHzRECEPTION NOTESThe scanner receives signals that are mainly "line of sight." That meansthat you usually cannot hear stations at your listening location thatextend beyond the horizon.During the summer, you might hear stations in the 30-50 MHz range locatedseveral hundred or even thousands of miles away. This phenomenon is knownas skip, and is caused by summer atmospheric conditions. This type ofreception is unpredictable but often very interesting.One useful service is the National Oceanic Atmospheric Administration(NOAA) Weather Radio's continuous weather broadcasts. These broadcastsadvise you of the current weather conditions, weather predictions, andalso contain information about any threatening weather. These stationsuse three frequencies - 162.40, 162.475, and 162.55 MHz. In most areas ofthe country, you can receive one or more of these frequencies.GUIDE TO THE ACTION BANDSWith the right frequencies programmed into the scanner, you can monitorexciting events. With a little investigation, you can find activefrequencies in your community. We can give you some general pointers, andyou can take it from there. Please use caution and common sense whenyou hear an emergency call. Never go to the scene of an emergency - itcould be the most dangerous thing you could ever do.Find out if there is a local club that monitors these frequencies.Perhaps a local electronics repair shop that works on similar equipmentcan give you the frequencies used by local radio services. A volunteerpolice or fire employee can also be a good source of this information.As a general rule on VHF, most activity is between 153.73 and 159.46 MHz.Here you find local government, police, fire, and most such emergencyservices. If you are near a railroad yard or major railroad tracks, lookbetween 160.0 and 161.9 MHz for signals.In some larger cities, there has been a move to the UHF bands for theseemergency services. Here, most of the activity is between 453.025 and453.95 MHz and again between 456.025 and 459.95 MHz.In the UHF band, the range between 456.025 and 459.95 MHz and againbetween 465.025 and 469.975 MHz is used by mobile units and controlstations associated with base and repeater units that operate 5 MHz lower(that is, between 451.025 and 454.95 and between 460.025 and 464.975 MHz).This means that if you find an active channel inside one of thesespreads, you can look 5 MHz lower (or higher, as the case may be) to findthe major base station/repeater for that radio service.