Transmit/Receive Indicator; Display Dimmer - Icom IC-28H Instruction Manual

(9 HIGH/LOW SWITCH [HI/LO]
HI/LO
|
@@ TRANSMIT/RECEIVE
INDICATOR [Т/В]
1) DISPLAY DIMMER
SENSOR
(2 DUPLEX SWITCH [DUP]
DUP
(3 MIC CONNECTOR
(TONE SQUELCH SWITCH
DIGITAL SQUELCH SWITCH
[T/D.SOL]
T/D.SQL
(2) +8V DC OUTPUT
e іп the MEMORY mode, push to transfer the displayed frequency,
which is the contents of the selected memory channel, to the VFO.
After the transfer, the 1С-28Н changes to the VFO mode. Refer
to SECTION 5-2 MEMORY CHANNEL TO VFO TRANSFERS.
Push to change between the HIGH (45W) and LOW (5W) transmit
output power. The word "LOW" appears when LOW power is
selected.
This two-color LED indicates whether the IC-28H is in the trans-
mit or receive mode. The LED is red while transmitting and green
while receiving with the squelch circuit open. The indicator is OFF
when the squelch circuit is closed and the receiver is muted.
This sensor measures the ambient light and controls the display
dimmer circuit which varies the intensity of the LCD backlighting.
Push to select simplex or duplex operation:
e The transmit frequency is LOWER than the receive frequency by
600kHz or by the programmed offset amount when "DUP-"
appears on the display.
e The transmit frequency is HIGHER than the receive frequency by
600kHz or by the programmed offset amount when '"DUP-"
appears on the display.
e When neither "DUP—" nor "DUP-" appear on the display, the
1С-28Н is in the simplex mode. The transmit and receive fre-
quencies are equal at this time. Refer to SECTION 5- 4 DUPLEX
MODE.
Connect the supplied microphone to this connector. Refer to
SECTIONS 4-1 MOBILE INSTALLATION, 4-2 FIXED IN-
STALLATION and 5 -6 MICROPHONE.
FRONT VIEW (8) AF OUTPUT
(3)FREQ UP/DOWN
(мо CONNECTION
This switch turns ON and OFF the optional squelch systems:
e TONE SQUELCH SYSTEM
When activated, "ТОМЕ" and "D.SQL" appear on the display.
Push the SET SWITCH in order to program the desired subaudible
tone numbers. Refer to SECTION 5 - 9 OPTIONAL UNITS.