rs928ampreview
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| rs928ampreview [2026/02/08 12:14] – [Conclusions] g7bcs | rs928ampreview [2026/02/08 13:13] (current) – [Inside the box] g7bcs | ||
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| Up against the rear heatsink panel is the RF deck which consists of a pair of Mitsubishi 2SC2904s in a conventional push pull class AB setup, along with bias stabilisation circuitry and impedance matching magnetics. | Up against the rear heatsink panel is the RF deck which consists of a pair of Mitsubishi 2SC2904s in a conventional push pull class AB setup, along with bias stabilisation circuitry and impedance matching magnetics. | ||
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| A board on the bottom of the case contains 6 low pass output filter networks along with switching relays for the filters, TX and RX signal path switching and two input attenuators. This also contains a directional coupler for forward and reverse power sensing, some relay drivers and a current sensing chip to detect the final current drain. | A board on the bottom of the case contains 6 low pass output filter networks along with switching relays for the filters, TX and RX signal path switching and two input attenuators. This also contains a directional coupler for forward and reverse power sensing, some relay drivers and a current sensing chip to detect the final current drain. | ||
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| Against the front panel is a control board containing the LCD display, front panel buttons, a dsPIC30F6014 processor, an RS-232 level converter, some fan speed control circuitry and power supply regulators. | Against the front panel is a control board containing the LCD display, front panel buttons, a dsPIC30F6014 processor, an RS-232 level converter, some fan speed control circuitry and power supply regulators. | ||
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| There is one further board which houses the three rear panel jack sockets for the control signals and some signal conditioning for the input transmit frequency detection. | There is one further board which houses the three rear panel jack sockets for the control signals and some signal conditioning for the input transmit frequency detection. | ||
rs928ampreview.txt · Last modified: by g7bcs