Open and closed modes | Radio Shack PRO-97 instruction

The Basics

LTR system are assigned to speciﬁc talk groups, which are identiﬁed by the radio as six-digit numbers. These numbers are in the form AHHUUU, where:

A = Area code (0 or 1)

H = Home repeater (01 through 20)

U = User ID (000 through 254)

When the scanner receives a transmission on a channel set to the LTR mode, it ﬁrst decodes the LTR data included with the transmission. In the open mode, the scanner stops on the transmission and displays the talk group ID on the bottom line of the display. In the closed mode, the scanner only stops on the transmission if the LTR data matches a talk group ID that you have stored in the bank’s talk group ID list and have not locked out.

LTR systems are frequently programmed so that each radio has a unique ID code.

open and closed modes

You can set your scanner to change the way it receives signals. These settings, called open mode and closed mode, affect how the scanner receives signals from communications systems that use some type of closed squelch (such as Motorola, EDACS, and LTR systems).

	Notes	In open mode, you hear all active talk groups except those
	Notes	you speciﬁcally exclude, making it easy to hear everything
		you speciﬁcally exclude, making it easy to hear everything
		going on. In closed mode, you hear only those talk groups
		you specify. This makes it easy to listen only to talk groups
		you are interested in and exclude others.
		When you select a system voice channel manually, any
		transmission opens squelch, regardless of the current
		mode.

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Radio Shack PRO-97 manual Open and closed modes

Contents

PRO-97 1,000 Channel Triple Trunking Hand Held Scanner Contents Contents ﬁnding and storing active frequencies Trunking Speciﬁcations Glossary FAQs Frequently Asked Questions WarrantyCare FCC wants you to know Your scanner’s controls ENT completes the entry of frequencies and text TUV enters an 8, or inputs characters T, U, or Basics OFF VOL/SQ turn the scanner on or off and adjust the squelch Power sources Using batteries Never install non-rechargeable batteries Charging rechargeable batteries Using AC power Basics Using vehicle battery power Connecting an earphone/headphones Listening safely Connecting an extension speakerTrafﬁc safety Basics Connecting the supplied antenna Connecting an optional external antenna Basics Using the belt clip Transferring data to or from another scanner or Understanding your scanner’s modes AM modeQuick start DCS DC mode FM modeCtcss CT mode Motorola mode Basics Edacs mode LTR mode Open and closed modes Basics Setting up your scanner Turning on the scanner and setting squelch Basics Storing known frequencies into channels Beyond the Basics Ctcss and DCS Beyond the Basics Storing trunking frequencies into channels DCS Code Table Storing text tags Assigning a text tag to a channel Assigning a text tag to a group ID Assigning a text tag to a bank Text input chart ﬁnding and storing active frequencies Searching a preprogrammed frequency range Band charts Search bank SR0 marine band Beyond the Basics Search bank SR1 CB band Search bank SR2 FRS/GMRS/MURS band Search bank SR3 police/ﬁre band Search bank SR4 aircraft Search bank SR6 programmable limit search Searching active frequencies in a rangeSearch bank SR5 amateur band Beyond the Basics Beyond the Basics Manually tuning a frequency Listening to the weather band Same standby mode Listening to a weather channel WX Alert and beep tone conﬁrmation Copying a frequency into a speciﬁed channel Using frequency copyBeyond the Basics Skywarn Copying a frequency into an empty channel within a bank Signal Stalker Copying a frequency into the priority channel Using Signal Stalker Using Signal Stalker II with lockout Scanning the channels Turning channel-storage banks off and on Using Ctcss and DCS Monitoring a single channel/power save circuit Deleting frequencies from channels Deleting all frequencies in a channel bank Locking out channels Using delayLocking out channels or frequencies Reviewing locked-out frequencies Reviewing locked-out channelsLocking out frequencies Clearing all locked-out frequencies in a search bank PriorityClearing a locked-out frequency Beyond the Basics Changing the receive mode Using the attenuator Using the display/key backlight Turning the key tone on and off While Multi-System Trunking Scanner appears, press Beyond the Basics Using the keylock Changing the display contrast Beyond the Basics Cloning the programmed data Receives data from another scanner other than a PRO-97 Trunking How trunking works To listen to the transmission, the mode Beyond the Basics Setting squelch for trunking mode Programming trunking frequencies Beyond the Basics Programming Motorola trunking systems UHF-Lo Beyond the Basics Programming Motorola trunking systems 800 MHz Programming ﬂeet maps Block Size Code S10 S11 S12 Talk group IDs Storing talk group IDs Beyond the Basics Beyond the Basics Talk group ID hold Turning an ID sub-bank on or off Delay function in ID indication mode Locking out talk group IDs Clearing all talk group IDs in a single bank Reviewing locked-out talk group IDsClearing talk group IDs Changing the open/closed mode Birdie frequencies Service and repairCare Speciﬁcations Selectivity 25 27.995 MHz at AM mode ±5 kHz 9V DC Beyond the Basics Initializing your scanner FCC wants you to know Scanning legally Glossary FAQs Frequently Asked Questions Scanner is not working at all. What’s wrong? RadioShack Corporation