FT-920 Operating Manual
41
Receiver Accessories
Noise, interference, changing signal characteristics,
and changing propagation can all present difficult
challenges to today’s operator. The FT-920, however,
provides a wealth of features designed to enhance
reception on our crowded bands. These features are
described below.
Clarifier (Offset Tuning)
The Clarifier feature allows offset tuning from the
current VFO frequency. The Clarifier provides sev-
eral important capabilities:
r If the incoming signal begins to drift, the [RX
CLAR] may be activated so as to allow you to
continue receiving the other station
without
requiring you to adjust both your transmit and
receive frequencies (possibly causing interfer-
ence to other nearby operators).
r For DX pileup operation, the [TX CLAR] may
be used to establish a split TX/RX frequency
relationship, and the [RX CLAR] may be used
to establish an optimum calling frequency.
r If you frequently need to move a fixed amount
of frequency excursion (such as “five up”), the
[TX/RX CLAR] control allows you to program
this amount for instant recall and QSY to that
frequency.
Press the [RX CLAR] key to activate the Receive Clari-
fier. The RX CLAR indicator will appear on the display,
and the VFO-B Tuning Dial may now be used to move
your receive frequency up to ±9.99 kHz. If you want
the transmit
and
receive frequencies to follow the
programmed offset, also push the [TX CLAR] key.
The amount of offset from the VFO frequency will be
displayed in the Multi-Function Window of the dis-
play, and a graphical representation of the magni-
tude and direction of the offset can be provided in the
Enhanced Tuning Scale, with proper setup of Menu
Item U-10 (see page 74).
To turn the Clarifier off, push the [RX CLAR] (and/or
[TX CLAR]) again. The transceiver will revert to the
original VFO frequency; however, the offset will not
be wiped clean, but rather maintained at the current
value on the assumption that you may want to hop
back to the offset frequency again.
To set the Clarifier offset to
Zero
, press the [CLAR
CLEAR] key.
CW Center Tuning (Enhanced Tuning Scale)
The Enhanced Tuning Scale may be used to provide
a visual indication of precise frequency adjustment
in the CW mode. Configuration of the Enhanced Tun-
ing Scale is performed via Menu Item U-10 (page
74).
When CW Center Tuning has been selected, the CW
passband center frequency (as determined by the
setting of the P
ITCH control) becomes the center point
of the Enhanced Tuning Scale. Per the illustration
below, when proper alignment of the incoming signal’s
pitch is accomplished, your
transmitter
signal will pre-
cisely aligned in a “zero beat” with the frequency of
the incoming signal.
CW S
POT
The CW Spot feature provides an
audible
method of
aligning your FT-920’s transmitter to the frequency
of an incoming signal (as opposed to the
visual
method provided by the Enhanced Tuning Scale).
By pressing the SPOT key, you will activate a constant
audio “sidetone” which is set to the pitch which
matches (precisely) the pitch of your transmitted sig-
nal. The sidetone pitch frequency also corresponds
to the center frequency of the receiver filter pass-
band (with the IF SHIFT control centered in its default
position). By aligning the CW Spot tone to match the
pitch of an
incoming
station’s signal, you will cause
your signal and the other station’s signal to be ex-
actly on the same frequency.
The Spot tone’s center frequency may be adjusted
to any value between 300 Hz and 1050 Hz (in 50 Hz
steps) by rotation of the PITCH control.
RF Preamplifier Selections
Two RF preamplifier circuits are provided on the FT-
920, each yielding particular benefits for the varying
requirements throughout the operational range of this
transceiver:
r A Junction FET (JFET) preamplifier includes
high-Q selectivity for excellent protection from
out-of-band energy.
r A Dual-Gate MOSFET preamplifier provides
high gain and low noise figure, particular ben-
eficial on the higher bands.
Via Menu Item U-47, you may assign these pream-
plifiers on a band-by-band basis; the default selec-
To Next Page
