应该有的我都有了，就是没研究出怎么接他 哈哈！
我搞个图您帮我连接一下！
每组接头我都写在上面了
http://www.hellocq.net/forum/attachment.php?attachmentid=89951&stc=18信道ＧＭ３００接口：
8 channel units
pin 1 = int spkr megative (not gnd)
pin 2 = mic audio, 80mv for 60%dev
pin 3 = mic ptt
pin 4 = not used
pin 5 = flat tx audio, 150mv for 60%dev
pin 6 = not used
pin 7 = gnd
pin 8 = cor active low ruindicator follows tone if used.
pin 9 = not used
pin 10 = ign control
pin 11 = disc audio, 600mv controlled by ju551
pin 12 = not used
pin 13 = sw a+ 1/2 amp max!
pin 14 = remote hook sw
pin 15 = int spkr pos
pin 16 = ext spkr pos
１６信道ＧＭ３００接口：
same as above except:
pin 4 = programmable output defaults to external alarm.
pins 6,8,9,12,14 = programmable i/o (the options can be viewed with the rss)
中继连线：
based on the above information this is how the cross-connection between the radios should go!
radio1 radio2
pin 3 ptt ___________________ pin 8 cor
pin 8 cor ___________________ pin 3 ptt
pin 5 tx audio ___________________ pin 11 disc audio
pin 11 disc audio ___________________ pin 5 tx audio
pin 7 gnd ___________________ pin 7 gnd
**** caution **** check to see the programable outputs of the 16 pin connector prior to hooking up. also, the 5 pin radios will not do this because you can't get cos and ptt outputs.
以上资料表明，１６信道与８信道ＧＭ３００的接口是有区别的，就是有些引脚功能是可以通过编程定义的，这些脚中，与中继有关的只有８脚。所以请检查是否８脚被定义为别的功能了。
另外，我记忆中，ＧＭ３００做中继使用，似乎需要短接话筒接口的２脚与６脚。
下图左侧为１６信道的ＧＭ３００接口图，右侧为８信道的ＧＭ３００接口图。
http://www.hellocq.net/forum/attachment.php?attachmentid=122696&stc=1gm300 16信道
引脚序号 英文 中文
1 external speaker negative
2 microphone audio 80mv rms @60% deviation 外部话筒音频输入 80mv 60%调制度
3 microphone ptt 外部话筒ptt控制
4 programmable output 可编程的功能输出口
5 flat transmit audio 150mv rms @60% deviation 末级发射音频输入 150mv
6 programmable input 可编程的功能输入口
7 ground 接地
8 programmable output/input 可编程的功能输入口和输出口
9 programmable input 可编程的功能输入口
10 ignition control input 点火控制输入
11 discriminator audio output 600mv rms @60% deviation 检频输出 600mv（机器内部选择）
12 programmable output/input 可编程的功能输入口和输出口
13 switch a+ sense 0.5amps max 经过开关控制的电源输出（最大0.5a）
14 programmable output/input 挂机开关输入
15 internal speaker positive
16 external speaker positive
