Repeater Operation - Yaesu FT-920 Operating Manual

To set the 50 MHz CTCSS Tone Mode (CTCSS/
Burst), use Menu Item U-36 (see page 77).
To set your FT-920's transmitted CTCSS tone
(Menu Item U-35/36 must be set to C
Menu Item U-37 (see page 78).
To set your FT-920's CTCSS Decoder CTCSS
tone, use Menu Item U-38. The default value
is "Off," which means that Tone Squelch
(CTCSS Decode) operation is not engaged.
Set this Menu item to the appropriate tone so
as to keep your receiver quiet until the match-
ing tone is received from the repeater.
To set the 29 MHz repeater shift, use Menu
Item U-39 (see page 78).
To set the 50 MHz repeater shift, use Menu
Item U-40 (see page 78).
One press of the [RPT] key will have set the FT-
920 for "Minus Shift" operation. In this situation,
you will observe both the "-" and "RPT" indicators
on the display. If your repeater uses a positive shift
(instead of negative), press the [RPT] key again;
the "+" indicator will replace the "-" indicator on
the display, while "RPT" will remain illuminated.
The majority of repeaters on the 29 and 50
MHz bands use "-" shift.
Set the FT-920's receiver to the repeater output
(downlink) frequency.
Close the [PTT] switch and speak into the micro-
phone. You will observe that the transmitted fre-
quency has shifted according to the setting of the
[RPT] key.
Release the [PTT] switch to return to the receive
mode.
Since FM is a continuous-duty mode, we recom-
mend you rotate the RF P
wise so as to use the minimum power necessary
to gain access to the repeater. This will signifi-
cantly reduce the amount of heat generated by
the transmitter section.
Since repeaters do not all use the same access
tone, we recommend that you load your favorite
repeater frequencies into memory, to avoid the
inconvenience of always having to reset the
CTCSS tone frequency. When a repeater fre-
quency is stored into memory, the receive fre-
quency, shift direction, shift magnitude, and tone
information are all stored into the memory regis-
ter. See page 59 for details of memory operation.
58
), use
ONTI
control counter-clock-
WR
Linear Amplifier Tuning
A special feature of the FT-920 allows you to do low-
duty-cycle tune-up of your linear amplifier by trans-
mitting a high-speed pulse, instead of a continuous
carrier.
Here is how to do this:
Press [M ] to enter the Menu mode.
ENU
Select Menu Item U-55 by rotating the VFO-B
Tuning Dial, then press [E
B Tuning Dial to select the amount of time you
want the pulser to be active (the default time pe-
riod is 10 seconds). Now press [E
Rotate the VFO-B Tuning Dial to select Menu Item
U-52 ("LI-TU-S"). When you press [E
will commence transmission. The number of sec-
onds remaining in the transmission will appear on
the main frequency display area.
Once the countdown is complete, the Menu dis-
play will say "OFF," and you may either repeat the
tune-up pulse transmission by pressing [E
again, or exit to normal operation by pressing
[M ].
ENU
The duration of the tune-up time may be adjusted via
Menu Item U-55. The length of the transmitted pulses
is adjusted via Menu Item U-57 (default: 100 ms.),
while the interval between pulses may be adjusted
via Menu Item U-56 (default: 100 ms.). You therefore
can adjust the duty cycle to your requirements. You
may wish to reduce the interval time (via U-56) to a
very low value, such as 10 ms., so as to make the
transmitted pulses resemble a continuous carrier.
The power output used during this tune-up proce-
dure can also be set independently for the Antenna-
A port and the Antenna-B port. The power output used
during this tune-up procedure (not during regular
operation) may be set via Menu Item U-53 (Antenna-
A) or U-54 (Antenna-B).
The FT-920 provides a wide variety of memory sys-
tem resources. These include:
99 "standard" memory channels, numbered
"01" through "99."
FT-920 Operating Manual
] and rotate the VFO-
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] again.
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], the pulser
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