Icom IC-28A Instruction Manual page 26

eUT-29 TONE SQUELCH UNIT
SUBAUDIBLE FREQUENCIES
Ш OPTIONAL SOUELCH UNIT
OPERATION
4) Use the front panel DOWN/UP SWITCH to select the desired tone
memory.
5) Turn the TUNING CONTROL to choose the required tone
number.
6) Push the SET SWITCH.
Complete the above programming before attempting to use either
optional squelch unit.
1) Push the T/D.SQL SWITCH to activate the squelch unit.
e UT-28: "0.50" appears on the display.
eUT-29: "D.SOL" and "TONE" appear оп the display.
(The simplex mode must be used.)
2) Operate the ІС-28А/Е in the usual manner as explained in the
previous sections of this manual.
e Turn the optional squelch unit OFF with the T/D.SQL SWITCH
in order to program the subaudible tone encoder, the transmit
offset or the tuning steps.
3) When operating with the digital code squelch unit, confirm that
the station with whom you intend to communicate is using the
same group code and an AQS system.
4) The scanning function cannot be used when the UT-28 Digital
Code Squelch Unit is activated.