Icom IC-821H Instruction Manual page 12

{ PANEL DESCRIPTION
E Accessory socket information
1 -o Main or sub band AF detector output.
AF
Fixed, regardless of [AF] position.
Ground for microphone output.
(controlled by the squelch circuit)
input/output pin.
Goes to ground when transmitting.
When grounded, transmits.
AMOD Modulator input. The input level is Input impedance : 10 kQ
4 selectable. (p. 44) Input level : 100 or 2 mV rms
PACT Direct modulator input for 9600 bps Regular input level : 1.0 Vp-p (0.35 V rms)
data operation.
Max. input level : 1.6 Vp-p (0.56 V rms)
AF Main or sub band AF detector output. | Same as pin 1 above.
DISC Main or sub band direct detector Output impedance : 4.7 KQ
output for 9600 bps data operation. Output level : 300 mV rms
SQL Main or sub band squelch output. Squelch open : Less than 0.3 V/5 mA
Goes to ground when squelch opens. | Squelch closed : More than 6.0 V/100 pA
Outputimpedance :4.7kQ
Output level : 100 to 300 mV rms
Ground level :—0.5 to 0.8 V
Input current : Less than 200 mA
Ros
Ree,
Rear pane!
view
7 13.8 V 13.8 V output when power is ON Output current : Max. 1A
ALC ALC voltage input/output. Control voltage :—4to0 V
input impedance : More than 10 kQ
MIC UD Microphone up/down input. Same as the [MIC] connector pin G) below.
* The function of pins 1, 4, 5, 6 and 8 are selectable in set mode with the [M/S] switch. (pgs. 43, 44)
E Microphone (HN-12)
@ UP/DOWN SWITCHES [UP]/[DN]
Change the operating frequency or memory chan-
nel.
- Continuous pushing changes the frequency or memory
channel number continuously.
@ PTT SWITCH
: Push and hold to transmit; release to receive.
@) UP/DOWN ON/OFF SWITCH [ON/OFF]
Activates and deactivates the [UP]/[DN] switch con-
@ Main band squelch switch
DOWN UP
—
mbam
E | ON/OFF
PTT | RECEIVE 470
? TRANSMIT
CAUTION: DO NOT short pin 2 to ground as this
can damage the internal 9 V regulator.
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