Radio Shack PRO-2053 owner manual Understanding Trunking, Setting Squelch for the Trunking Mode

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available on the Internet, (for example, at www.trunkscanner.com).

UNDERSTANDING TRUNKING

In the past, groups that transmit frequently, such as police departments, could transmit on only a few frequencies. This resulted in heavy traffic and often required 2-way radio users to wait for a specific frequency to clear before transmitting. Trunked systems allow more groups of 2-way radio users to use few- er frequencies. Instead of selecting a specific frequency to transmit on, a trunked system chooses one of several frequencies when the 2-way radio user transmits. The system automatically transmits the call on that fre- quency, and also sends a code that identifies that 2-way radio user's transmission on a control channel.

Your scanner lets you easily hear both the call and response transmissions for that 2- way radio user and therefore follow the con- versation. For EDACS and Motorola (above 406 MHz range), the scanner monitors the control channel between each transmission to identify talk groups.

SETTING SQUELCH FOR THE TRUNKING MODE

Your scanner automatically mutes the audio during trunk scanning when it decodes con- trol channel data. However, we recommend you turn SQUELCH clockwise and leave it set to a point just after the hissing sound stops. This lets the scanner quickly acquire the data channel.

PROGRAMMING TRUNKING FREQUENCIES

You program trunking frequencies the same as non-trunked frequencies, except that you must store the appropriate mode (MOT or ED) with each frequency.

Notes:

•You can scan only one type of trunked frequency, either EDACS or Motorola in a bank. You can, however, mix conven- tional channels and frequencies in a bank.

•If you are programming trunked frequen- cies for Motorola Type I and hybrid sys- tems, you must first program the fleet map (see "“Programming Fleet Maps” on Page 33).

•If you are programming frequencies for an EDACS system you must store them in the Logical Channel Number order (usually listed as LCN#). For example, LCN1 would go into channel 01 for the current bank, and LCN2 would go into channel 02.

Follow these steps to program trunked fre- quencies:

1.Press PROG and press (or hold down) 8 or 9 to select the bank.

 

 

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òôòòòòò

Bank

 

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Note: To move through the banks one at a time, repeat the sequence of PROG, FUNC then 8 or9 until you reach the desired bank. To move through the bank selection faster, press PROG then FUNC and hold down 8 or 9.

2.Press TRUNK to enter the ID program mode.

3.Repeatedly press MODE to select )+0 for Motorola, or ! for the EDACS (GE/ Ericsson) system to scan. This sets the

Trunking Operation

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Contents PRO-2053 Channel Desktop Trunk-Tracking Scanner FCC Wants You to Know Contents Trunking Operation Special FeaturesGeneral Guide to Frequencies Specifications TroubleshootingCharacter, 4-Line, Alphanumeric Dis Simultaneous Trunking OperationTriple Conversion Superheterodyne Re Telescoping Antenna provides excellent Scanning LegallyPreparation Power SourcesUsing AC Power Using Vehicle Battery PowerListening Safely Connecting the AntennaConnecting AN EARPHONE/ Headphones Connecting an Outdoor AntennaAbout Your Scanner Traffic SafetyLook AT the Keypad Quick Start Understanding Your Scanners Modes Understanding BanksEdacs Mode Operation Turning on the Scanner and Setting SquelchOpen and Closed Modes Storing Known Frequencies Into Channels Storing Text Tags Storing Trunking Frequencies Into ChannelsAssigning a Text Tag to a Channel Assigning a Text Tag to a Group Text Input ChartAssigning a Text Tag to a Bank Searching a Preprogrammed Fre- quency Range Finding and Storing Active FrequenciesBank Band Search bank SR0 Marine band Receive mode FM Search bank SR1 CB band Receive mode AM Group Search bank SR2 Police/Fire band Receive Mode FMSearch bank SR4 Ham band Receive mode FM Search bank SR3 Aircraft Receive mode AMListening to the Weather Band Manually Tuning a FrequencySpecial Notes WX Alert and Beep Tone Confir- mation Using Frequency Copy FunctionListening to a Weather Channel Displaying Weather MessagesCopying a Frequency into the Pri- ority Channel Scanning the ChannelsTurning Channel-Storage Banks Off and On Using the Delay Function Special FeaturesLocking OUT Channels or Frequencies Clearing All Locked-Out Frequen- cies in a Search Bank PriorityReviewing Locked-Out Frequen- cies Clearing a Locked-Out FrequencyChanging the Receive Mode Cloning Programmed Data Using the AttenuatorTurning the KEY Tone on and OFF Changing the Display ContrastTrunking Operation Understanding Trunking Setting Squelch for the Trunking ModeProgramming Trunking Frequencies DF appears Programming Motorola Trunking Systems UHF-LoProgramming Fleet Maps Programming Motorola Trunking System 800 MHzSize Code ?ýDe$ý CEJ0ýded Talk Group IDsStoring Talk Group IDs 8Wdaý&#Turning Sub-Banks On or Off Talk Group ID HoldClearing Talk Group IDs Delay Function in ID Indication ModeLocking Out Talk Group IDs Reviewing Locked-Out Talk Group IDsUS Weather Frequencies in MHz Changing the Open/Closed ModeGeneral Guide to Frequencies Open and Closed ModesBirdie Frequencies Ham Radio FrequenciesVHF Band Guide to the Action BandsTypical Band Usage HF BandUHF Band Primary UsageBand Allocation AbbreviationsServicesHigh Frequency HF Meter Amateur Band-50-54 MHz in 5 kHz steps VHF High Band 148-174 MHz in 5, 6.25 or 7.5 kHz steps New Mobile Narrow Band 220-222 MHz in 5 kHz steps Ultra High Frequency UHF Conventional Systems Band Locally Assigned in 6.25 kHz steps Frequency Conversion Initializing the Scanner TroubleshootingRESETTING/INITIALIZING the Scanner Resetting the ScannerCare Sensitivity 20 dB S/N SpecificationsSpecifications Page Page Limited One-Year Warranty
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