Item specifics
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Origin
CN(Origin)
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DIY Supplies
ELECTRICAL
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Certification
NONE
Reminder:
1. This motherboard is only for medium wave wireless lovers, and can well test the effect of ore radio.
2. Loose parts: including components and audio cables on the main board, and the frequency points shall be debugged by yourself.
Finished board: available when powered on, including audio cable.
Radio sound:
http://v.youku.com/v_show/id_XNDQxNDk1NTEzMg==.html
Electrical parameters:
Power supply: 9v2a DC, 5.5 interface, internal positive and external negative (self provided power supply is required)
Transmission frequency: 530 ~ 1600khz (medium wave band of radio)
High frequency transmission power: adjustable 20 MW ~ 500 MW, and the adjustable power can be used within 5 ~ 10 meters.
Antenna: 1.5 ~ 2.5 copper wire for 5m home
Audio input: 3.5mm at both ends, with board accessories
Sound source: CD, desktop computer, mobile phone, etc
Applicable to: medium wave radio enthusiasts, for students to study the principle of wireless signal generation and audio modulation of AM transmitter.
The audio amplification circuit outputs sufficient audio power to the modulation circuit.
This board adopts collector modulation, has the characteristics of low distortion, adjustable amplitude, and superior sound quality; suitable for radio enthusiasts and student experiments.
Adjust the 223 tuning capacitor, the frequency can be changed between 530~1600KHZ;
Debugging method of spare parts: turn the PVC counterclockwise to the end, adjust the PVC trimming capacitor to the angle shown in the figure, set the digital display radio to 530KHZ, fine-tune the midweek until the signal is received; then adjust the PVC clockwise to the end , Set the digital display radio to 1600KHZ, adjust the PVC trimming capacitor to 1600KHZ, and adjust it back and forth to set the radio to 5300~1600KHZ. It is similar
to the method of adjusting the local oscillator of the whole transistor.
The use and experiment of radio transmitters must comply with local radio regulations, and adjust the amplitude knob to minimize the power.
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