常用组件：

1. 输入 uhd_source
2. 输出 uhd_sink

输出功率的控制：
子板的参数：

|   |    /
|   |   |       TX Dboard: A
|   |   |   ID: SBX (0x0055)
|   |   |   Serial: F3727A
|   |   |     _____________________________________________________
|   |   |    /
|   |   |   |       TX Frontend: 0
|   |   |   |   Name: SBXv3 TX
|   |   |   |   Antennas: TX/RX, CAL
|   |   |   |   Sensors: lo_locked
|   |   |   |   Freq range: 400.000 to 4400.000 MHz
|   |   |   |   Gain range PGA0: 0.0 to 31.5 step 0.5 dB
|   |   |   |   Bandwidth range: 40000000.0 to 40000000.0 step 0.0 Hz
|   |   |   |   Connection Type: QI
|   |   |   |   Uses LO offset: No

我们可以设置的只有tx_gain增益，范围是0-31.5dB。

1. 滤波器
   1. low__pass_f_ilter
2. 运算
   1. complex 2 mag
3. GUI组件
   1. QT Label
   2. QT chooser
   3. WX slider(滑动条), QT Range
4. file sink:

• complex64: IEEE 754 single-precision floats, 4 bytes per sample, real and imaginary
• float32: IEEE 754 single-precision floats, 4 bytes per sample
• int32: signed integer, 4 bytes per sample
• int16: signed integer, 2 bytes per sample
• int8: signed integer, 1 byte per sample