■ Ext Keypad] Jack; ■ Ref I/O] Connector; ■ X-Verter] Connector; ■ Relay] Jack - Icom IC-7850 Instruction Manual

20
CONNECTOR INFORMATION
■ [EXT KEYPAD] jack
The circuit is used to output memory content in 8 chan-
nel memories. You can output desired memory content
such as CW Memory keyer, Voice memory, RTTY/PSK
Memory to be transmitted. Push a switch to send the
memory information. Hold down the switch for 1 sec-
ond to repeatedly send the memory information.
When you connect the external keypad, turn ON the
following items in the Others set screen.
(SET [F-7] > OTHERS[F-5])
• External Keypad (Voice)
• External Keypad (Keyer)
• External Keypad (RTTY)
• External Keypad (PSK)
Mute switch: Mutes both transmission and reception
when the switch is turned ON.
■ [REF I/O] connector
This connector outputs or inputs a 10 MHz reference
signal.
• Input/Output impedance: 50 Ω
• Output level:
• Required input level:
• Output signal stability:
If you use an external reference signal,
set to "IN" in the "REF IN/OUT" item of the
ACC set screen.
You can adjust the internal Reference Signal frequen-
cy in the "REF Adjust" item of the ACC set screen.
(SET [F-7] > ACC [F-2] > REF Adjust)
■ [X-VERTER] connector
You can connect your transverter unit
through the connector.
• Input/output impedance:
50 Ω
• Output level: Approximately –20 dBm or more
You can change the transverter function in the "Trans-
verter Function" item of the Others set screen.
You can also adjust the offset frequency in the "Trans-
verter Offset" item of the Others set screen.
(SET [F-7] > OTHERS [F-5] > Transverter Offset)
(p. 15-16)
Approximately –10 dBm
Approximately –10 dBm
±0.05 ppm (0 ~ +50°C)
Mute switch
■ [RELAY] jack
Goes to ground when transmitting to con-
trol an external non-Icom linear amplifier.
You can select either mechanical relay or
semi-conductor MOS-FET control.
Specifications
• Mechanical relay (Reed Relay):
16 V DC/Less than 0.5 A
• MOS-FET: Less than 250 V/ Less than 250 mA
You can change the control in the "SEND Relay Type"
item of the ACC set screen.
(SET [F-7] > ACC [F-2] > SEND Relay Type)
When the SEND terminal controls the inductive load
(such as a relay), a counter-electromotive force can
cause the transceiver's malfunction or damage. To pre-
vent this, we recommend adding a switching diode,
such as an "1SS133," on the load side of the circuit to
the counter-electromotive force.
[Example]
Switching diode
ACC 1/2
sockets
e SEND
u 15 V
20-4
L
1.5kø
± 5%
S5 S1
1.5kø
± 5%
S6 S2
2.2kø
± 5%
S7 S3
4.7kø
± 5%
S8 S4
External Keypad
To a non-Icom
linear amplifier
Relay
B
1.5kø
± 5%
1.5kø
± 5%
2.2kø
± 5%
4.7kø
± 5%
USER BOX
L
L