M7 Radio Specifications 4j2y45

M7 Radio Specifications Transmitter Characteristics -

RF Power Output 50 Watts +/- 1 dB for AM RF Power Output 100 Watts +/- 1 dB for FM Harmonics < -36 dBm for carriers up to 50 Watts Spurious signals -46 dBm ( 500 KHz from carrier waves) Modulation is 85 % +/- 5% variation

Receiver Characteristics - Sensitivity of AM Voice (30 % modulation) >= 10dB at -101dBm - Selectivity of AM Voice (25 KHz) < 6dB at +/- 12 KHz - Frequency Response of AM voice (25 KHz) is from 1 to -3 dB (300-3400 Hz)

Distortion of AM/FM is 5% of Total Harmonic Distortion in normal conditions.

This radio system has the AUTOMATIC GAIN CONTROL (AGC) feature .AGC refers to the decibel change in output from reference sensitivity

In telecommunications, squelch is a circuit function that acts to suppress the audio (or video) output of a receiver in the absence of a sufficiently strong desired input signal. Squelch is widely used in two-way radios to suppress the annoying sound of channel noise when the radio is not receiving a transmission. This M7 radio system has squelch levels adjustable from -110dBm to -60dBm in 1 dB steps.

TRANSMITTER BLOCK DIAGRAM

RECEIVER BLOCK DIAGRAM

BASIC BLOCK DIAGRAM OF M7 RADIO

General Specifications of M7 Radio V/U HF Transceivers frequency range is 100 MHz to 399.975 MHz. 4 Preselectable frequency bands area available to limit the radio to selectable frequencies. 5 different modulation techniques are AM, FM, AMWideband, FM-Wideband and Maritime. Default internal frequency is 10 MHz.

Power Supply specifications AC Supply – 110 to 240 volts AC Single Phase (48-62 Hz) DC Supply – Any voltage between 21.6 and 32 volts. Current Overload (separate AC and DC fuses area available for protection against current overload).

Functionalities of different modules of M7 Radio -

Power Supply ModuleConsists of AC-DC Converter, DC-DC Converter and voltage regulators, Electronic Protection Module, Computer Programmable Logic Device for controlling fan and status signals.

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Processor Module configures the IF and Baseband FPGA and the DSP blocks of the system.

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RF Control Module performs the RF processing and amplification required between the processor module and the RF power amplifier for both transmitter and the receiver. Takes care of ALC, RFAGC, and IFAGC. Consists of frequency synthesizer that is controlled by the LD. - Control Head module controls the DSP and the FPGA and the interface port. - Interface Module is the master hub for communication with other back mounted modules with processors .It is provided with Ethernet interface. - EPM Interface Module supervises status of all electronic blocks and their status signals.