M Icrophone Connector; Elec-Key] Jack; ■ Key] Jack - Icom IC-7851 Instruction Manual

■ Microphone connector
(Front panel view)
q Microphone input
w +8 V DC output
e Frequency up/down
8 V DC is applied to pin 1 for microphone operation.
You can turned OFF if it is not necessary in the "MIC
Input DC Bias" item of the Others set screen.
16)
The circuit is used to output memory information in
4-channel memories. You can output desired memory
information such as that from a CW Memory keyer,
Voice memory, RTTY/PSK Memory to be transmitted.
Push a switch to send the memory information. Hold
down the switch for one second to repeatedly send the
memory information.
When you connect the external keypad, turn ON the
following items in the Other set screen.
(SET [F-7] > OTHERS[F-5])
• External Keypad (Voice)
• External Keypad (Keyer)
• External Keypad (RTTY)
• External Keypad (PSK)
NOTE: You cannot transmit the CW memory keyer
and Voice memory from T5 to T8, the RTTY memory
from RT5 to RT8, or the PSK memory from PT5 to
PT8.
■ [ELEC-KEY] jack
Connect to a CW paddle.
You can change the paddle activation in the "Keyer
Type" item of the Keyer CW-Key
([KEYER [F-3]) > [EXIT/SET] > CW KEY [F-4] > Keyer
Type)
i AF output
(Main band)
u GND
(Microphone ground)
y GND (PTT ground)
t PTT
r Squelch switch
(Main band)
(p. 15-
(p. 15-16)
screen.
(dot)
(com)
(dash)
CONNECTOR INFORMATION
PIN No.
Microphone input (Impedance: 600 Ω)
q
+8 V DC output （Max. 10 mA）
w
Up: Ground Down: Ground through 470 Ω
e
r
"Low" level when the squelch opens.
t
PTT
y
PTT ground
u
Microphone ground
i
AF output (varies with [AF])
4.7kø 2.2kø
± 5% ± 5%
S4 S3
External Keypad
■ [KEY] jack
Connect to a CW straight key or the output of an exter-
nal electronic keyer.
20-3
DESCRIPTION
[MIC]
connector
1.5kø 1.5kø
PINe
± 5% ± 5%
MIC
1
2
3
S2 S1
PINy
(Front view)
L
_
+
20
7
8 6
5
4
B