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General| Brand | Magnum |
|---|---|
| Model | 257 |
| Category | Transceiver |
| Language | English |
Lists all items included with the Magnum 257 transceiver upon purchase.
Instructions for attaching the microphone hanger to the transceiver or other locations.
Guidance on selecting a mounting location for easy access and proper airflow.
Details on connecting the transceiver to a 13.8V DC power source, including cautions.
Information on connecting a 50-ohm antenna, including recommended types and connectors.
Procedure for checking and ensuring proper antenna system VSWR for optimal performance.
Addresses electrical noise from vehicle systems and the transceiver's noise blanker circuit.
Wiring configuration for the 6-pin microphone connector.
How to set the microphone gain for optimal audio output.
Adjusting receiver sensitivity to signals and background noise.
Controls for frequency tuning steps and activating the noise blanker circuit.
Functionality for recalling the last used frequency and accessing memory channel 4.
Accessing the call frequency and storing/recalling memory channel 2.
Changing operating modes (AM, FM, USB, LSB) and activating low-tone audio control.
Features for scanning frequencies and programming repeater frequency offsets.
Procedures for saving and recalling frequencies and modes to/from memory channels.
Description of the rear panel jack for connecting an external speaker.
Explanation of the tone that signals programming confirmation.
Details on the super-capacitor for retaining memory during power loss.
Specifies the transmit and receive frequency range of the transceiver.
Details the required impedance for the connected antenna system.
Describes the Digital Phase-Lock Loop (PLL) synthesizer used for frequency control.
States the transceiver's frequency accuracy under specified temperature conditions.
Specifies the voltage and ground type required for operation.
Indicates the maximum current draw of the transceiver.
Lists the width, height, and depth of the unit.
Provides the total weight of the transceiver.
Details the power output for SSB/FM and AM modes.
Specifies the available frequency tuning increments (1, 10, 100 kHz).
Identifies the specific transistors used in the transmitter output stage.
Specifies the level of unwanted emissions below peak output power.
Indicates the suppression level of the carrier signal.
Details the suppression level of the unwanted sideband.
Specifies the maximum frequency deviation for FM mode.
Defines the frequency range for the audio response.
Specifies the frequency response bandwidth for the transmitter.
Indicates the impedance requirement for the microphone input.
Identifies the type of circuit used in the receiver.
Lists the primary and secondary intermediate frequencies used.
Specifies the sensitivity for SSB, AM, and FM modes.
Details the selectivity for SSB, AM, and FM signals at specific dB levels.
Indicates the frequency shift range of the clarifier control.
Specifies the rejection level for adjacent channel interference.
Details the rejection ratio for intermediate frequency interference.
Defines the frequency range for the receiver's audio response.
Specifies the minimum audio output power with distortion levels.
Indicates the impedance of the audio output.
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