Forty-9er 3 Вт набор CW трансивер телеграф коротковолновый радио 7 023 МГц | Инструменты

Forty-9er 3 Вт набор CW трансивер телеграф коротковолновый радио 7 023 МГц | Инструменты

Note: The MOS field effect tube 2N7000 in the kit should be soldered as the last component. In order to prevent electrostatic breakdown, the 2N7000 should be disconnected from the power source of the soldering iron and soldered with residual heat.       The kit does not include antenna power headset keys. brief introduction     This is a very compact and simple 40-meter band micropower equal-amplitude telegraph transceiver, powered by a 9V square battery. When the transmission is better, you can communicate with amateur radio stations in nearby provinces within hundreds of kilometers.   This circuit was originally designed by foreign countries. It has stable frequency, good selectivity, high receiving sensitivity, and strong code readability. It can be used as a practical device for CW communication of radio enthusiasts!   main indicators Power supply: DC 9V-14V Antenna: 50 ohms, unbalanced Receive static current: 12mA 9V Transmitting power: 12V / 3W, 9V / 2W Frequency range: Transmit local oscillator 7.023MHz, receive local oscillator 7.023-7.026MHz (7.023MHz crystal) Working mode: CW     Circuit principle     The core of the receiving part is an NE602. After the signal from the antenna passes through a crystal filter and attenuation potentiometer, it enters the mixer. The oscillation circuit oscillates at the receiving frequency. After the two signals are mixed, they directly report the SSB / The CW signal is converted into audio, and the audio output from NE602 is sent to LM386 for amplification, thus completing the entire process. Therefore, a receiver that directly mixes radio frequency signals into audio is called a "DC receiver". The transmitting part uses the NE602 oscillation circuit, and then uses 9018 as a buffer amplifier. 9018 also serves as a transmission key to control the switching of the transceiver circuit and the signal. The final stage is a Class C amplifier composed of D882. The amplified high-frequency signal passes through the LPF. The antenna is connected after filtering.       Component selection    The magnification of 9018 is about 130, and the magnification of D882 is about 200. L4 is a high-frequency choke coil. Use FT37-43 (American magnetic ring) ferrite ring (black) to use 0.51mm enameled wire for 11 turns, about 20cm (can also use fixed inductors on the market instead), The inductance is around 20uH. L5 is a high-frequency filter inductor. On the T37-2 (American magnetic ring) iron powder core magnetic ring (red), use 0.51mm enameled wire or network wire to wind 16 turns, about 25cm, and the inductance is about 1uH. Other inductors: 1mH is a fixed color ring inductor, 100mH is a cylindrical fixed inductor, and is covered with a black heat-shrinkable sleeve. All capacitors smaller than 1000pF are high-frequency ceramics, 0.47uF capacitors are monolithic capacitors, capacitors larger than 1uF are aluminum electrolytic capacitors, and all resistors are 1 / 4W 5% fixed resistors.