Yaesu FT-2400H User Manual Download Page 10

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of memories L and U is the selected channel step size. Therefore the frequencies stored in
both memories /. and U are rounded down to the nearest 100 kHz to determine the actual
sub-band limits. Since they are not limited to a specific frequency, you can still use the L and
U memories for other purposes on any frequency within the 100-kHz range above the
intended subband limit.
Example: To limit reception to 146.0 ~ 148.0 MHz (only applicable to certain transceiver
versions)
O Tune the dial to any channel between 146.000 and 146.095 MHz.
O Hold the F/W button for Va-second, tune the selector knob so that L appears in the mem-
ory box, and then press F/W again momentarily. The displayed frequency is now stored to
provide an effective lower subband limit of 146.000 MHz.
O Tune the dial to any channel between 148.000 and 148.095 MHz.
O Repeat the second step, selecting U in the memory box. This stores the effective upper
subband limit of 148.000 MHz.
O Press D / MR, to change to memory operation.
O Press the MHZ PRI button momentarily to activate the 146.000 ~ 148.000 subband limits
for tuning and scanning.
To cancel your subband limits and return to memory operation, press D /MR (if you are
scanning, or want to return to dial operation, you must press it twice). Pressing the CALL
BELL button also cancels subband limits as operation switches to the CALL channel.
Once you have stored the L and U memories, you can reactivate the subband just by recall-
ing either memory and pressing MHZ PRI. However, you cannot activate the subband when
the L or U memories are marked for skip-scanning (you'll get ordinary memory tuning), or if
either of these memories are masked (hidden).

Priority Channel Monitoring

Priority monitoring provides automatic checking for activity on a priority channel (memory)
every five seconds while operating on the dial or other memories. When the receiver detects
a signal on the priority channel, operation automatically shifts to that memory while the
signal is present (plus a few seconds). If you transmit while paused on the priority channel,
priority monitoring ceases and operation stays on the priority memory.
To set up for priority monitoring:
O Preset the squelch, and store the frequency to be monitored in a memory (this must be
memory 1 if you will be operating on other memories during priority monitoring).
O Press D/MR to operate in the dial mode, or else select the memory you want to operate
on, and then press
F/W -» MHZ PRI.
A "P" appears in the memory box, and about every five seconds the displayed frequency
shifts to the priority memory briefly while the receiver checks for a signal.
While no signal appears on the priority channel to open the squelch, you can tune, transmit
and receive on the dial, or select and operate on other memories (but not scan them). If a
station you wish to talk with appears on the priority memory, press the PIT switch
momentarily while receiving their signal, to stop priority checking. Otherwise, when a signal
appears on the priority memory, priority checking will pause and the decimal on the display
will blink. Priority monitoring will resume according to how you set the scan-resume mode -

either after a 5-second pause, or after the carrier drops (see page 22). To cancel priority
monitoring manually, press D / MR.
Note that you can use any other memory as a priority channel in the above procedure when
you are going to be operating in dial mode. You cannot, however, switch from memory to
dial operation or vice-versa without first cancelling priority monitoring (pressing D/MR
cancels priority monitoring). You also cannot scan during priority monitoring.

CTCSS Operation

The built-in tone encoder function can be used to access repeaters and stations that require a
CTCSS (subaudible) tone, by sending a tone whenever you transmit. Also, if you have the
FTS-17A CTCSS Decoder Unit option installed, you can silently monitor for calls on busy
channels. The encode function superimposes a subaudible tone (at a frequency too low to be
heard) on the transmitted carrier. The optional (FTS-17A) decode function monitors receiver
audio through a narrow filter at the same subaudible frequency, keeping the squelch closed
until you receive a matching tone. Installation of Options at the back of this manual describes
installation of the FTS-17A.
To check or set the CTCSS tone frequency, press F/W —> TONE to display the tone fre-
quency in Hz. To change the tone frequency, rotate the selector knob or press the
microphone OWN and UP buttons until the display shows the tone frequency you require
(from the choices in the table at the right). Press TONE to return to the operat ing frequency
display after checking or selecting the tone frequency.
To activate CTCSS operation just press TONE when the operating frequency is displayed.
UENC" (encode) appears at the top of the display and the tone generator is activated for
transmission. If you press TONE again without the FTS-17A option, the encoder turns off. If
the FTS-17A is installed, both UENC" and "DEC" (decode) are displayed together as tone
squelch is activated for both transmission and reception (requiring a matching tone frequency
to open the squelch). Pressing TONE once more disables tone squelch.
You can store different CTCSS tones (and encode/decode states) in each memory in the
same manner (and at the same time) as storing operating frequencies. Later, to change the
tone or state stored in a memory, just recall it, reset the tone frequency or function, and store
the memory again.