This document serves as a technical supplement for the Yaesu FT-90R VHF/UHF Dual Band FM Mobile Transceiver. It provides essential information for servicing the unit, including detailed circuit descriptions, block diagrams, and alignment procedures. For operational and installation guidance, please refer to the separate FT-90R Operating Manual.
The FT-90R is designed for advanced users, allowing many adjustments without opening the transceiver case. However, servicing requires expertise in handling surface mount components. Vertex Standard Co., Ltd. is the manufacturer, with headquarters in Japan and operations in the USA, Europe, UK, and Hong Kong.
Key features and specifications include frequency ranges for VHF (144-148 MHz) and UHF (430-450 MHz), various channel steps, and multiple power output levels. The transceiver utilizes a double-conversion superheterodyne receiver and advanced PLL frequency synthesis for stable operation.
This supplement details the internal workings, including the reception and transmission signal paths for both VHF and UHF bands, AF signal paths, squelch control, and power supply control. It also outlines the necessary test equipment and precautions for alignment procedures, covering transmitter output, deviation, and receiver S-meter calibration.
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File Info : application/pdf, 50 Pages, 3.38MB
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