Icom IC-2725E Instruction Manual page 23

y EXTERNAL SPEAKER JACK 1 [SP-1]
Connects an 8 Ω speaker. Outputs both left and right
bands audio when no external speaker is connected to
[SP-2]. See the table below for details.
• Audio output power is more than 2.4 W.
u EXTERNAL SPEAKER JACK 2 [SP-2]
Connects an 8 Ω speaker. Outputs right band's audio only.
• Audio output power is more than 2.4 W.
i POWER RECEPTACLE [DC13.8V]
Accepts 13.8 V DC ±15% with the supplied DC power
cable.
NOTE: DO NOT use a cigarette lighter socket as a
power source when operating in a vehicle. The plug
may cause voltage drops and ignition noise may be su-
perimposed onto transmit or receive audio.
D D Speaker information
Connected
Left band audio
speaker
No external
Internal speaker (mixed audio)
speakers
[SP-1] only External speaker (mixed audio)
[SP-2] only Internal speaker
2 external External speaker via
speakers [SP-1]
D DATA JACK PIN ASSIGNMENT
q DATA IN
w GND
e PTT P
r DATA OUT
Right band audio
t AF OUT
y P SQL
External speaker
External speaker via
[SP-2]
PANEL DESCRIPTION
q
e
t
Input terminal for data transmit. See p. 67 for details on
how to toggle data speed between 1200 (AFSK) and
9600 bps (G3RUH, GMSK).
Common ground for DATA IN, DATA OUT and AF OUT.
PTT terminal for packet operation only. Connect ground to
transmit data.
Data out terminal for 9600 bps operation only.
Data out terminal for 1200 bps operation only.
Becomes high (+5 V) when the transceiver receives a sig-
nal which opens the squelch.
• To avoid unnecessary TNC transmission, connect squelch to the
TNC to inhibit transmission when receiving signals.
• Keep audio output at a normal level, otherwise a "P SQL" signal
will not be output.
1
1
w
r
Front panel view
y
6