论文部分内容阅读
设计目的提供一个高性能、低成本、在2、～7兆赫频率范围内实施高频发射和接收的军用或民用通讯。电台设备主要适于人背负;但借助有关的辅助设备也可用作固定台或车载台。技术说明书TRA.906电台包括收发装置和电池组容器。收发装置由一块印刷电路板构成。收发装置中,话筒的话音输入经由一个放大器而馈送到平衡调制器中;而在等幅波工作时,大约1千赫的键控单音注入该调制器。话音输入或键控单音输入,对载波振荡器的输出(8.9985兆赫下边带或9.0015上边带)进行调制。已调波的输出通过二极管接到一个9兆赫的边带滤波器,之后,所产生的单边带信号被放大,并和选定的波道振荡器的频率混频,从而提供射频输出。调幅时,载波在滤波器后重插,以产生一个兼容的调幅信号,激励级和末级放大器均工作在高效率类,并借助一个单接天线调谐器经发/收转换器与50欧阻抗或鞭天线插座相匹配。
Designed to provide a high-performance, low-cost, military or civilian communication for high-frequency transmission and reception in the 2-7 MHz frequency range. Radio equipment is mainly suitable for people carrying; but with the help of the auxiliary equipment can also be used as a fixed station or car station. Technical Specification TRA.906 Radio includes transceiver and battery pack. The transceiver consists of a printed circuit board. In transceivers, the microphone's voice input is fed to the balance modulator via an amplifier; and at constant amplitude waves, a key killer of about 1 kilohertz is injected into the modulator. Voice input or key-tone input to modulate the carrier oscillator output (8.9985 MHz lower sideband or 9.0015 upper sideband). The tuned output is passed through a diode to a 9 MHz sideband filter. The resulting single-sideband signal is then amplified and mixed with the selected channel oscillator frequency to provide the RF output. AM, the carrier after the filter re-inserted to produce a compatible amplitude modulation signal, the excitation level and the final amplifier are working in high efficiency class, and with a single antenna tuner via the transmitter / receiver converter with 50 ohm impedance Or whip antenna socket to match.