Cessna 172S Pilot Operating Handbook page 231

CESS NA
MODEL 1 72S
1 0. COMM FREQ U E N CY S ELECTO R KNOB (OUTER) -- The
outer, larger selector knob is used to change the M Hz portion
of the frequency display. At either ba nd-edge of the 1 1 8- 1 3 6
M H z frequency spectrum , an offscale rotation wi l l wrap the
display around to the oth er frequency band-edge (Le., 1 36
MHz advances to 1 1 8 M Hz) .
1 1 . CHA N N E L B UTTON - - Pressing the C HAN button for 2 or
more seconds wil l cause the unit to e nter the channel program
(PG) mode. U pon enteri n g the channel program mode, the
channel numbe r
progra m m ed . The desired ch annel can be selected by turn ing
the comm kHz knob. The channel frequency can be entered
by pushing the COMM TRANSFER button which will cause
the standby frequency to flash . The comm frequency knobs
are then used to enter the desired frequency.
(located between 1 36 MHz and 1 1 8 M H z) are entered instead
of a frequency, the correspond ing channel is skipped in
channel sel ection
programmed by pressi n g the COMM TRA N S F E R button and
using the same procedure. The channel information is saved
by pushing the CHAN button which wil l also cause the u n it to
return to the previous frequency entry mode.
The channel selection m ode (CH) can then be entered by
m omentarily pushing the CHAN butto n . The comm freque ncy
knobs can be used to select the desired channel . The unit will
automatically default to the previous m ode if no ch annel is
selected with in 2 seconds after entering the channel sel ection
mode. The unit is p laced i n the transmit mode by depress ing
a mic button .
J a n 3 1 /02
S E CTION 9 - S U PP L E M E NTS
S U PPLEM E NT 25 - FAA AP P ROVED
will flash ind icating
m ode. Additional
that it can
If dashes
channels may
S25-9
be
be