Installation Manual

23
Table 2 – Radio Option Connector P3 Interface Description
DB-25
Pin No
(J100)
Pin No
(P3)
I/O Description
21---
Ground:
# Audio Ground
52I
Internal Speaker Input #1:
# 5W across Internal Speaker
63O
Audio Amp Output #1:
# Vo ≈ 6.6 VDC
18 4 O
Audio Amp Output #2 to Internal or External Speaker
# Vo ≈ 6.6 VDC; 10W maximum across External
Speaker
19 5 I
External Mic Input:
# 300-3000 Hz
#
Input level @ 1kHz for 60% of RSD: 82 ± 28 mV
RMS
(if external audio source has Ro=600Ω)
#
Input level @ 1kHz for 60% of RSD: 41 ± 14 m V
RMS
(if external audio source has Ro<1Ω)
76I
External Mod Input:
#
5-10,000 Hz (3 db BW)
# Modulation-Sensitivity: 4.2 kHz/Vrms ± 3dB
20 7 O
Switched DC Output:
#
Icc=500 mA Max
88I
Push To Talk:
#
TX ON: Low
# TX OFF: Open
21 9 I
Mic Hookswitch:
#
“Disable” or “Enable” is selected by PC Programmer
# Hookswitch ON: Low
#
Hookswitch OFF: Open
910O
Rx Discriminator Detect Audio:
# 20-4,000 Hz (3 dB Bandwidth)
#
75 m V
RMS
±3 dB into a 10K ohm load
22 11 ---
Ground
10 12 I
Internal Mic Mute:
#
Mute ON: Low
# Mute OFF: Open
23 13 O
Radio UnSquelch:
#
Squelch Open: Low
#
Squelch Close: High
# RL = 4.7 kohms
11 14
Spare