GNURadio+HackRF小实验（FM发射与接收）
引言：初次接触HackRF，做了些小实验，记录一下。
运行环境：Ubuntu 16.04，HackRF One
1 运行环境搭建
百度上说虚拟机不好用，为了方便我直接做了个U盘系统（不是U盘启动盘），方法如下：
（1）准备两个U盘，一个性能差点没关系，另一个U盘需要性能好一点（用来装Ubuntu系统）;
（2）先用差点的U盘做一个Ubuntu启动盘;
（3）从U盘启动时会提示Try Ubuntu和Install Ubuntu，选择后一个，将系统安装在好一点的U盘上，这里一定要注意，不要误选了电脑的硬盘，否则后果很严重，楼主花了300大洋恢复硬盘数据（引以为戒）。
GNURadio配置：
《HackRF与GNURadio入门指南》上有配置方法，网址如下：
http://www.hackrf.net/hackrf%E4%B8%8Egnuradio%E5%85%A5%E9%97%A8%E6%8C%87%E5%8D%97/
不过我用这个方法没有成功，不知到是不是我的网速不行，有些东西没安装好。
我是用下面网站的方法安装的：
http://bobao.360.cn/learning/detail/405.html
这里贴一下关键命令：
sudo apt-get install hackrf libhackrf-dev libhackrf0
sudo
apt-get
install
gnuradio gnuradio-dev gr-osmosdr gr-osmosdr gqrx-sdr wireshark
2 FM接收机
参考的哪个视频已经不记得了，大家可以自己百度一个看看，代码如下，保存成grc文件，就可以
Sat Oct 15 11:19:45 2016
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0
rational_resampler_xxx_0
analog_wfm_rcv_0
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0
3 FM电台
代码如下，保存成grc文件，然后用GNURadio打开。
Mon Oct 17 14:46:32 2016
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100e6
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20
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10
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0
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100e6
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20
gain15
10
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20
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0
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0
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100e6
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20
gain16
10
ant17
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20
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0
corr17
0
freq17
100e6
if_gain17
20
gain17
10
ant18
bb_gain18
20
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0
corr18
0
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100e6
if_gain18
20
gain18
10
ant19
bb_gain19
20
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0
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0
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100e6
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20
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10
ant1
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20
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0
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0
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100e6
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20
gain1
10
ant20
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20
bw20
0
corr20
0
freq20
100e6
if_gain20
20
gain20
10
ant21
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20
bw21
0
corr21
0
freq21
100e6
if_gain21
20
gain21
10
ant22
bb_gain22
20
bw22
0
corr22
0
freq22
100e6
if_gain22
20
gain22
10
ant23
bb_gain23
20
bw23
0
corr23
0
freq23
100e6
if_gain23
20
gain23
10
ant24
bb_gain24
20
bw24
0
corr24
0
freq24
100e6
if_gain24
20
gain24
10
ant25
bb_gain25
20
bw25
0
corr25
0
freq25
100e6
if_gain25
20
gain25
10
ant26
bb_gain26
20
bw26
0
corr26
0
freq26
100e6
if_gain26
20
gain26
10
ant27
bb_gain27
20
bw27
0
corr27
0
freq27
100e6
if_gain27
20
gain27
10
ant28
bb_gain28
20
bw28
0
corr28
0
freq28
100e6
if_gain28
20
gain28
10
ant29
bb_gain29
20
bw29
0
corr29
0
freq29
100e6
if_gain29
20
gain29
10
ant2
bb_gain2
20
bw2
0
corr2
0
freq2
100e6
if_gain2
20
gain2
10
ant30
bb_gain30
20
bw30
0
corr30
0
freq30
100e6
if_gain30
20
gain30
10
ant31
bb_gain31
20
bw31
0
corr31
0
freq31
100e6
if_gain31
20
gain31
10
ant3
bb_gain3
20
bw3
0
corr3
0
freq3
100e6
if_gain3
20
gain3
10
ant4
bb_gain4
20
bw4
0
corr4
0
freq4
100e6
if_gain4
20
gain4
10
ant5
bb_gain5
20
bw5
0
corr5
0
freq5
100e6
if_gain5
20
gain5
10
ant6
bb_gain6
20
bw6
0
corr6
0
freq6
100e6
if_gain6
20
gain6
10
ant7
bb_gain7
20
bw7
0
corr7
0
freq7
100e6
if_gain7
20
gain7
10
ant8
bb_gain8
20
bw8
0
corr8
0
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100e6
if_gain8
20
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10
ant9
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20
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0
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100e6
if_gain9
20
gain9
10
comment
affinity
args
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1
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(704, 110)
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0
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osmosdr_sink_0
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fc32
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time_source1
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time_source2
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time_source3
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time_source4
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time_source5
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time_source6
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time_source7
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1
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1
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FM_samp_rate
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rational_resampler_xxx
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comment
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(536, 139)
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rational_resampler_xxx_0
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ccc
wxgui_scopesink2
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comment
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(320, 243)
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wxgui_scopesink2_0
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samp_rate
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float
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rational_resampler_xxx_0
0
0
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blocks_multiply_const_vxx_0
wxgui_scopesink2_0
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0
（1）Audio Source模块：
这个模块是从话筒采集信号，Sample Rate参数可以自己设置，一般音乐的采样率为44.1k，这里的设置为48k。
（2）Multiply模块
对话筒接收的信号进行线性放大，保证信号的清晰度。
（3）Fractionnal Interpolator模块
这个我也不懂，不过需要注意的是，模块上的875m表示875e-3，我当时只看到截图，花了点时间才知道的。
（4）WBFM Transmit模块
300u表示300e-6。
（5）osmocom Sink模块
Sample Rate(sps)：决定了音频输出的快慢，我用了一个滑块来调整到合适值。
Ch0：Frequency（Hz）：载波频率，决定了你能在哪个频道上收到信号 （注意：注意使用无线电请遵守法律，不要干扰其他无线电设备）。
Ch0：RF Gain（dB）：修改这个值可以改变发射信号覆盖的范围。
（6）最后，你可以用你的手机FM接收HackRF电台的信号了。