diy kit
diy kit
diy kit
Has the following characteristics:
1. The SMD devices on the main control board have been pre-soldered, and are connected to the bottom plate in the form of stamp holes. The microcontroller adopts PIC16F1936/1938, built-in PLL local oscillator, supports crystal oscillator calibration settings, and has its own frequency indication circuit (using seven-segment LED digital tube, display The unit is 1KHz, the photo has color difference, the actual color is red), the working frequency covers 7.000-7.100MHz, 1KHz or 100Hz step (refer to the figure below, free switching).
2. TA2003 is used for receiving, and crystal filter is used for intermediate frequency. After TA2003 multiplication and detection, the volume of sound is adjusted by digital potentiometer and sent to active audio filter circuit. Finally, the speaker is driven by LM386, and the intermediate frequency frequency supports calibration settings.
3. Use 3 BS170 parallel outputs, class E amplification, 12V power supply output power 5W
4. Relay switching is used for sending and receiving, with the function of sending delay adjustment, which avoids frequent switching of relays and improves the isolation of sending and receiving channels.
5. It has the function of automatically shooting and sending call signs, which is very convenient to use. The single-chip microcomputer uses our original code, which can adjust the code speed, sidetone frequency and sidetone size, and can input the call sign by itself (in the automatic key mode), and supports power-down saving.
6. The PCB board of this kit can be easily put into the 88*30*120mm aluminum chassis (the outer shell needs to be prepared by yourself, and the size of the front and rear panels is in the network disk).
main indicators
Power supply: 12V
Operating Current: Receive ?120mA @ 12V; Transmit ?1A @ 12V
Transmit Power: 5W @ 12V
Frequency range: 7.000MHz-7.100MHz, 1KHz/100Hz step
Working mode: CW transceiver, SSB receive