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General| Type | Handheld Transceiver |
|---|---|
| Modulation | FM |
| Number of Channels | 40 |
| Antenna Impedance | 50 ohms |
| Output Power | 5W |
| Channel Spacing | 25 kHz |
| Supply | Battery or External DC |
| Power Supply | 7.2V DC |
| Frequency Range | 144-148 MHz |
Identifies the TH-28A/28E and TH-48A/48E transceiver models covered in the manual.
Lists the standard accessories provided with the transceiver for initial setup.
Provides essential steps to follow before operating the transceiver for the first time.
Illustrates the front panel controls for all types except U.K. and European versions.
Illustrates the front panel controls specific to the U.K. and European versions.
Details the location and function of major external components on the standard transceiver model.
Details the location and function of major external components on the UK/Europe transceiver model.
Describes the NiCd battery pack, its charging, and installation procedures.
Provides instructions for recharging the NiCd battery pack and how to install it into the transceiver.
Explains how to interpret the battery voltage level indicators during transmit.
Lists the estimated operating times for different battery types and transmitter output power levels.
Warns about low battery indicators and the impact of battery type on performance.
Guides on connecting the battery and antenna, and powering on the transceiver.
Explains how to directly enter a desired frequency using the keypad.
Illustrates how frequency steps are selected based on keypad input.
Details the procedure for selecting desired tuning or scan step sizes.
Describes how to use the tuning control for frequency adjustment.
Shows how displayed frequencies change when step sizes are altered.
Explains how to program specific VFO tuning ranges within 1 MHz band segments.
Describes how to select and use subband frequencies.
Outlines the steps required to transmit, including frequency checks and microphone use.
Explains how to select different transmitter output power levels.
Details the output power levels (H, M, L, EL) for different battery and supply conditions.
Describes how to temporarily disable the transceiver's transmit function.
Explains the automatic transmission timer that stops continuous transmission after 10 minutes.
Explains how various data is retained via EEPROM and a lithium battery.
Provides a step-by-step guide for entering and storing data into memory channels.
Details the procedure for clearing the contents of an individual memory channel.
Resets all user programmed data to factory default settings by resetting the memory.
Explains how to reset the microprocessor's VFO memory without affecting other stored data.
Describes the total memory channels available and what information can be stored in each.
Guides on storing receive and transmit frequencies with offset for split channels.
Explains how to verify split channel settings using display indicators.
Details the procedure for storing the call channel frequency.
Describes methods for recalling stored memory channels using keypad or tuning control.
Explains how to copy memory or call channel data to VFO for tuning.
Guides on displaying custom text (up to six characters) for memory channels.
Explains how to cancel a custom message display for a memory channel.
Describes Time Operated Scan and Carrier Operated Scan for pausing during scans.
Lists Memory Scan and Band Scan as available scanning features.
Details MHz Scan, VFO/Memory, CALL/VFO, CALL/Memory, and V/M/C scan types.
Explains how to scan programmed memory channels, excluding locked-out ones.
Guides on skipping specific memory channels during a memory scan.
Explains how to initiate a scan across the entire band using VFO mode.
Describes how to initiate a programmable band scan within specified frequency limits.
Details how to set upper and lower frequency limits for two programmable band scan memories.
Explains how to check the programmed scan limits for programmable band scan memories.
Guides on starting a programmable band scan after setting limits.
Describes how to perform a scan over a 1 MHz range.
Explains alternating scan between VFO and last used memory channel.
Explains alternating scan between Call channel and VFO.
Explains alternating scan between Call channel and last used memory channel.
Explains scanning VFO, last memory, and Call channel alternately.
Details how repeaters use separate transmit and receive frequencies and offset directions.
Guides on how to select the transmit/receive frequency offset direction.
Explains the automatic offset programming based on region and how to cancel it.
Describes how to manually select any offset frequency within a specific range.
Explains the reverse function for repeaters with reciprocal transmit/receive frequencies.
Details how to select sub-audible tones or 1750 Hz tone for repeater access.
Explains how to activate the tone function and transmit the selected tone.
Introduces the autopatch feature allowing telephone conversations via repeaters using DTMF.
Explains how to set a delay time for DTMF entry to avoid holding the PTT switch.
Guides on storing up to 10 DTMF telephone numbers (up to 15 digits) in memory.
Explains how to recall stored DTMF codes in receive mode.
Details the steps to initiate a DTMF call using stored codes.
Instructs on selecting tone frequencies for CTCSS operation.
Explains how to activate the CTCSS function, indicated by a 'CT' display.
Guides on selecting three-digit DTSS codes from 000 to 999.
Explains how to activate and use the DTSS function for squelch activation.
Discusses the delay for DTSS signal transmission with repeaters to avoid malfunctions.
Provides instructions to change the DTSS delay time.
Introduces paging using DTMF signals for calling specific stations or groups.
Details the 11 available paging code memory slots and their uses.
Guides on programming your individual station ID code into memory A.
Explains how to send pages by entering the Paging mode and setting codes.
Guides on calling all members of a group using a stored group code.
Provides instructions to call a specific member within a group.
Explains how to receive pages and respond to the calling party.
Describes how to receive pages sent with an individual code.
Describes how to receive pages sent with a group code.
Explains how to reprogram squelch to open regardless of incoming paging codes.
Guides on locking out specific paging codes to avoid unwanted reception.
Details two methods for transmitting messages: direct keypad or stored in memory.
Guides on entering and storing messages in the 10 available message memory channels.
Provides a chart showing key combinations for inputting alphanumeric characters for messages.
Explains how to check the contents of message memory channels.
Guides on transmitting messages stored in memory.
Details message reception when DTSS function is active.
Details message reception when Paging function is active.
Explains how to clear received message memory without affecting transmit memory.
Describes the Tone Alert system for audible alarms indicating incoming signals.
Explains how to alternate beep sounds between tone alarm and telephone ring.
Allows monitoring of the channel by pressing the MONI key, overriding squelch settings.
Explains how to disable beeps produced by front panel key presses.
Describes how to activate the LCD illumination lamp for night operation.
Explains how to lock keys to prevent accidental operation, indicated by a LOCK indicator.
Conserves battery power by activating a circuit 10 seconds after the last key press.
Allows changing the on/off rate for the battery saver function.
Automatically turns off the transceiver after a period of inactivity or no signal.
Guides on setting the current time on the transceiver's clock.
Details how to set a timer for the transceiver to switch on automatically.
Explains how to activate an alarm that sounds when the switch-on timer time is reached.
Details how to set a timer for the transceiver to switch off automatically.
Explains how to start or stop the switch-on and switch-off timers.
Guides on activating and performing cross band operations by selecting sub bands and frequencies.
Explains how to perform cross band operations using memory channels.
Provides general guidance on transceiver operation and maintenance.
Details procedures for returning the transceiver for repair and necessary documentation.
Recommends maintaining records of purchase, serial number, and service history.
Lists common operational problems and their corrective actions.
Lists various optional accessories available for the transceiver.
Provides step-by-step instructions for installing the CTCSS unit.
Provides step-by-step instructions for installing the Memory Expansion Unit.
Explains how to switch to the three-digit memory recall mode.
Guides on connecting and programming the SMC-33 remote control speaker microphone.
Details how to assign functions to the remote control microphone keys.
Recommends electret type microphones and notes impedance and voltage requirements.
Explains how to connect an external speaker or earphone via the speaker jack.
Lists general specifications including frequency range, mode, and operating temperature.
Details transmitter output power, current drain, and other related specifications.
Lists receiver sensitivity, selectivity, and audio output power specifications.
Provides quick key combinations for activating basic functions like band scan and CTCSS.
Lists quick key combinations for advanced functions like DTSS and Paging.
Lists quick key combinations for memory operations, VFO tuning, and scans.
Lists quick key combinations for power settings, tone alerts, and stop functions.
A table outlining fields for RX Freq, TX Freq, offset, DTSS, and REV for memory channels.
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