OZ2CPU的Digital RF Wattmeter with LC Display的制作

这个是国外OZ2CPU发表在TEST&MEASUREMENT上的电路，电路制作很实用，是业余爱好者射频测量的好工具，以前有空闲时，动了心思，DIY了一个。MCU是PIC16F876，测量IC是ADI的AD8307。仪器很灵敏，可以外置衰减器，通过LCD的菜单选择。
Specifications
Frequency coverage: 1 kHz to 500 MHz (calibrated)
1 kHz to 1000 MHz (uncalibrated, for
relative power measurements only)
Nominal input impedance: 50 Ω
Input power range: –60 dBm to +30 dBm
(1 nanowatt to 1 watt).
Input power range using 50-dB attenuator: up to 100 kwatts.
Dynamic range: 90 dB with good RF shielded case.
Resolution: 0.1 dBm (1 dBm on bar-graph)
Input return loss: @300kHz: –35dB
@100MHz: –27dB
@500MHz: –25dB
Input SWR: @ 300kHz: 1.036
@100MHz: 1.094
@500MHz: 1.12
Accuracy before calibration: ±1 dB from 1 MHz to 450 MHz.
After calibration: ±0.2 dB at each calibrated frequency.
DC Voltage Measurement: 0 to 20 volts.
DC Voltage Resolution: 20 mV
DC Voltage accuracy after calibration: ±20 mV
Power supply: 9 to 20 VDC
Current consumption: with no LCD light: 30 mA;
with normal LCD light:120 mA.


热转印的板子，水平有限，大家见笑看了。

OZ2CPU的电路和作品

做得不错啊，还用了金蛋，实际使用效果怎样？

这个微功率计太灵敏了，用它测电台没有衰减器不行还没有合适的衰减器，用功率电阻试下小功率，效果不错。

楼主改制的不错，好手艺！