Micropower Medium Wave Transmitter，Ore Radio for Home radio

Description

Tips:
1. This motherboard is only for medium wave wireless lovers. It can test the effect of ore radio well.
Radio sound:
http://v.youku.com/v_show/id_XNDQxNDk1NTEzMg==.html
Electrical parameters:
Power supply: 9V2A DC, 5.5 interface, internal positive and negative (requires own power supply)
Transmitting frequency: 530 ~ 1600KHZ (radio band)
High-frequency transmission power: adjustable from 20 mW to 500 mW, the power can be adjusted within 5 to 10 meters.
Antenna: 1.5 ~ 2.5 copper wire for 5 meters home
Audio input: 3.5mm at both ends, with board accessories
Audio source: CD, desktop computer, mobile phone, etc.
Application: Medium wave radio enthusiasts, for students to study the principle of wireless signal generation and modulation.
The audio amplifier circuit outputs sufficient audio power to the modulation circuit.
This board adopts the collector modulation, which has the characteristics of small distortion and adjustable amplitude, and excellent sound quality. It is suitable for experiments by radio enthusiasts and students.
Adjust the 223 tuning capacitor to change the frequency between 530 ~ 1600KHZ;
Parts debugging method: Turn the PVC counterclockwise to the extreme end, adjust the PVC trimmer capacitor to the angle shown, set the digital display radio to 530KHZ, and fine-tune the mid-cycle until a signal is received; then adjust the PVC clockwise to the extreme , Set the digital display radio at 1600KHZ, adjust the PVC trimmer capacitor to 1600KHZ, and adjust the radio back and forth to set the radio at 5300 ~ 1600KHZ. It is similar to the method of adjusting the local oscillator of the crystal tube.
Use and experimental radio transmitters must comply with local radio regulations. Adjust the amplitude knob to minimize power.