RELM SMX920 Technical Manual
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Contents
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Technical Manual Installation and OperationRELM/ BK RADIO 7An on onboard EEPROM stores all of the user channel related data such asfrequencies, CTCSS tones etc. A serial port at the Microphone accessory socket of theSMX920 provides access to the Controller card software configurations for thepurpose of the user to create and change this channel related information.Special functions capable of being carried out include non-predictive full duplexCTCSS encoding/decoding, DCS encoding/decoding as well as 5-Tone and DTMFsignalling. Digipots under the control of the processor ensure that user set up levelsfor TX deviation and power levels are correctly set for each channel.1.2.2 Power Amplifier ModuleThe PA receives the low level modulated RF signal from the Exciter RF output andamplifies and filters it to final output power level. Forward and reflected powervoltages are fed to the Micro Controller.The PA is very compact and efficient for high reliability and low cost. The heat sinkhas minimal temperature rise even under continuous operation, ensuring the bestMTBF obtainable for a practical design. A low loss 13 element elliptical low passfilter ensures that harmonics remain below –90 dBc. The new PA module uses thelatest LDMOS technology and using only two active RF transistors improvesefficiency and increases the operating bandwidth. At the same time this reduces thenumber of components used and further improves the long term reliability. |
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