44针扩展接口定义
1 spkr- differential output to the external 8Ω, 8w speaker
2 stop scan digital control input for stop scan function
3 spkr+ differential output to the external 8Ω, 8w speaker
4 ext rx audio+
5 ext rx audio-
differential received audio output (0 dbm; 600Ω; not
controlled by volume, but affected by squelch)
6 ext tx audio+
7 ext tx audio-
differential transmit audio input (600Ω input impedance,
0 dbm is required for full power)
8 ptt in voice transmission command (short to ground) for voice
signals
9 ptt in data transmission command (short to ground) for data signals
10 ptt in cw transmission command (short to ground) for cw
(morse) signals
11 sw a+ primary dc voltage current limited output (max 1a)
12 dsi/kw c c bdm – data serial in/kw amplifier channel change
13 kw on/off kw amplifier power on/off output
14 rev close loop * close the loop of alc radio (input)
15 rxa receive input (point-to-point protocol to host/hlc)
16 txa transmit output (point-to-point protocol to host/hlc)
17 ex reset external reset input (for bdm)
18 gnd ground
19 kw ptt ptt output to kw amplifier
20 ext alarm external alarm output (open collector, pulled to ground
when external alarm is activated
21 vpp flash programming voltage, input to bdm
22 dsc/kw_alc bdm – data serial clock/kw amplifier alc
23 sq gate squelch open/closed indication output
24 dso/fan on/off bdm – data serial out/fan control
25 freeze/kw tu bdm – freeze/kw amplifier tune
26 gnd ground
27 fwd close loop * alc radio loop closure input
28 rxc * receive input (point-to-point protocol to host/hlc)
29 txb rs-232 transmit output to vp-116, pps, 500w, astic
30 amp rev * maintain constant power at 500w transceiver output
31 rxd * receive input (point-to-point protocol to host/hlc)
32 tx audio out input to baseband tx path
33 rxb rs-232 protocol receive input to vp-116, pps, 500w,
astic
34 rx audio out input to baseband rx path
35 rx audio in output from baseband rx path
36 amp fwd * maintain constant power at 500w transceiver output
37 vp ptt * ptt output (active low)
38 txd * transmit output (point-to-point protocol to host/hlc)
39 txc * transmit output (point-to-point protocol to host/hlc)
40 tx audio in output from baseband tx path
41 ext rx audio(2)+ audio out from isb hybrid
42 ext tx audio(2)– audio out from isb hybrid
43 ext rx data– * baseband output (0 dbm, 600 Ω)
44 ext rx data+ * baseband output (0 dbm, 600 Ω)
