Yaesu FT-920 Operating Manual page 81

U-44 ( )
Function: Define whether Mark or Space shall be
the idling (key up) tone
Available Values: /
Default:
The above abbreviations are defined as:
(Normal) The idling tone is Space.
(Reverse) The idling tone is Mark.
U-45 ( )
Function: Define the Packet displayed frequency
offset
Available Values:
Default: kHz
You can have the display show the (suppressed) car-
rier frequency or the center frequency between the
two Packet tones, for example.
U-46 ( )
Function: Align the transceiver to the frequency of
the tone pair defined by the TNC.
Available Values:
Default:
The above designations of the available values rep-
resent the center frequency of the Packet tone pairs,
plus their injection sideband (L =LSB, U=USB).
U-47 ( )
Function: Determine which receiver input preampli-
fier is to be used on each band
Available Values: /
Defaults: (1.8 ~ 24.49 MHz),
These preamplifier choices allow the user to custom-
ize the preamplifier choice for each amateur band.
Preamplifier is a Junction FET type, providing
superior strong-signal-handling capability, while
preamplifier is a Dual-Gate MOS FET, providing
best Noise Figure. Note that the total gain of the J-
FET amplifier is somewhat lower than for the MOS
FET preamp, but on the lower frequency bands the
additional gain is not needed.
The gain of the J-FET amplifier rolls off above 30
MHz, as does the gain of the MOS FET amplifier
below about 7 MHz; accordingly, we do not recom-
mend these amplifiers be used outside of the recom-
mended frequencies.
FT-920 Operating Manual
~ kHz
/ / /
/ / /
/
(24.5 ~ 54 MHz)
U-48 ( )
Function: Enable/Disable the use of the Automatic
Antenna Tuner in the Receive mode
Available Values: /
Default:
Engaging the Antenna Tuner in the Receive mode
helps protect the receiver circuitry from strong out-
of-band signals; it acts as an additional bandpass fil-
ter ahead of the fixed bandpass networks already
protecting the receiver. There is a very slight reduc-
tion in sensitivity when this feature is ON, which should
prove insignificant in everyday operation.
U-49 ( )
Function: Set the maximum power level for the "A"
antenna terminal
Available Values: /
Default:
This convenience feature allows you to limit the power
applied to the "A" antenna port, in case you wish to
excite a low-drive linear amplifier, for example. You
may use the other antenna port for full-power opera-
tion, of course.
U-50 ( )
Function: Set the maximum power level for the "B"
antenna terminal
Available Values: /
Default:
This convenience feature allows you to limit the power
applied to the "B" antenna port, in case you wish to
excite a low-drive linear amplifier, for example. You
may use the other antenna port for full-power opera-
tion, of course.
/
/
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