What to do if channel activity bars are flashing but no sound is heard on my Radio Shack HANDHELD TRUNKING 20-521 Scanner?
If the channel activity bars are flashing but no sound is heard on your Radio Shack Scanner, the transmission might be a private or telephone interconnect call, which the scanner doesn't scan. Another possibility is that the ID shown is not active. Wait for the ID to become active, or scan another transmission.
General| Brand | Radio Shack |
|---|---|
| Model | HANDHELD TRUNKING 20-521 |
| Category | Scanner |
| Language | English |
Details on how to power the scanner using different sources.
Instructions for installing and using AA batteries.
Procedure for charging rechargeable batteries within the scanner.
Guidance on powering the scanner from an AC outlet.
Instructions for powering the scanner from a vehicle's power source.
How to connect external antennas for improved reception.
Guidelines for safe listening practices with earphones/headphones.
Warnings about using earphones/headphones while driving.
Instructions for attaching the belt clip for portability.
Explanation of the function of each key on the scanner's keypad.
Description of the scanner's display indicators and their meanings.
Explanation of service and channel storage banks for organization.
Information on using temporary memory locations for frequencies.
Steps to power on the scanner and adjust the squelch control.
Guide to programming specific frequencies into memory channels.
How to find and save active frequencies within a band.
Procedure for searching frequencies within a defined range.
How to search pre-programmed service bands for transmissions.
Method to skip specific frequencies during searches.
How to listen to frequencies stored in monitor memories.
Process for transferring a stored frequency to a permanent channel.
How to initiate scanning of programmed channels.
Steps to tune the scanner to a specific channel directly.
How to set a delay for transmissions to avoid missing replies.
How to enable or disable specific channel banks for scanning.
Method to skip unwanted channels during scanning.
How to set priority channels to monitor during scanning.
How to lock the keypad to prevent accidental changes.
How to activate the display's backlight for visibility.
How to adjust search speed between normal and Hypersearch.
How to enable or disable audible key press feedback.
How to enable or disable the battery saving mode.
How to configure the scanner to ignore data transmissions.
Explanation of Motorola Type I, Type II, and hybrid trunking systems.
How to switch the scanner from conventional to trunk tracking.
Guidance on adjusting squelch for optimal trunk tracking.
Steps to enter frequencies for trunked systems into banks.
How to begin scanning programmed trunked frequencies.
How to hold on a specific ID during trunk tracking.
Method to save an ID temporarily for later use.
How to prevent the scanner from stopping on specific IDs.
Process to remove a single ID from the lockout list.
Method to remove all locked IDs from the lockout list.
How to program a delay for trunk tracking to catch replies.
How to view active talk group IDs during trunk tracking.
Explanation of the visual indicators for trunked system activity.
How to organize and scan stored trunking IDs.
Procedure to manually add IDs to scan lists.
How to transfer IDs between different scan lists.
How to remove an ID from a scan list.
How to configure the scanner for Type I and hybrid systems.
Detailed steps for programming custom fleet maps for trunking.
How to choose and apply pre-programmed fleet maps.
Steps to configure a system that combines Type I and Type II features.
Information on weather and other common frequencies.
List of internal scanner frequencies that may cause noise.
Overview of typical frequency usage by various services.
Listing of services associated with frequency ranges.
How to convert between MHz, kHz, and wavelength units.
Procedure to reset the scanner to factory defaults.
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