最好用后面的扩展口的接口写频。
nout of the 25 pin accessory connector (j3):
pin no. pin name description
1 spkr- differential output to the external 8ohm, 8w spkr
2 spare
3 spkr+ differential output to the external 8ohm, 8w speaker
4 rx audio+ differential output of received audio signals (0dbm; 600ohm; not controlled by volume)
5 rx audio- differential output of received audio signals (0dbm; 600ohm; not controlled by volume)
6 tx audio+ differential input received audio signals (600ohm impedance; -9 to 0dbm is required for full power)
7 tx audio- differential input audio signals (600ohm impedance; -9 to 0 dbm is required for full power)
8 ptt_in voice transmission command (by short to ground) for voice signals
9 ptt_in data transmission command (by short to ground) for data signals
10 ptt_in cw transmission command (by short to ground) for cw (morse) signals
11 sw a+ 13.8v (nominal) current limited
12 kw_c_c kw option channel change
13 kw_on/off kw option power on/off
14 agc fast/slow agc fast or slow release
15 rxd point to point communication line to host/hlc
16 txd point to point communication line to host/hlc
17 reset external reset
18 gnd ground
19 kw ptt kw ptt
20 ext_alarm external alarm operation (open collector - pulled to ground when external alarm is activated)
21 vpp flash programming voltage
22 kw_alc kw_alc
23 sq_gate squelch indication
24 fan on/off fan on/off
25 kw tune kw tune