Yaesu FT DX 9000D - COMPUTER AIDED TRANSCEIVER, Operation Manual

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Page 103 FT
DX
9000D O
PERATION
M
ANUAL
CW S
POTTING
(
Z
ERO
-B
EATING
)
CW C
ONVENIENCE
F
EATURES
“Spotting” (zeroing in on another CW station) is a handy
technique for ensuring that you and the other station are
precisely on the same frequency.
For everyday operation, the (CW) PITCH control (# )
allows you to set the center of the receiver passband, as
well as the offset pitch of your CW carrier signal, to the
tone pitch you prefer to listen to.
The front panel’s Tuning Meter may also be moved so you
can adjust your receiver frequency to center the incoming
station on the pitch corresponding to that of your trans-
mitted signal.
Using the SPOT System
If you press and hold in the front panel’s BK-IN/SPOT
key (#
), the Spot tone will be heard. This tone corre-
sponds to the pitch of your transmitted signal, and if you
adjust the receiver frequency to match the pitch of the re-
ceived CW signal to that of the Spot tone, your transmit-
ted signal will be precisely matched to that of the other
station.
Advice
In a tough DX pile-up, you may actually want to use
the SPOT system to find a “gap” in the spread of call-
ing stations, instead of zeroing in precisely on the last
station being worked by the DX station. From the DX
side, if a dozen or more operators (also using Yaesu's
SPOT system) all call precisely on the same frequency,
their dots and dashes merge into a single, long tone
that the DX station cannot decipher. In such situations,
calling slightly higher or lower may get your call
through.
The bar indicator on the front panel may be utilized
for CW frequency adjustment, as well. Its configura-
tion is set via Menu item “DISPLAY 016 BAR DIS-
PLAY SELECT;” at the factory, the bar indicator is
already set up for the “CW TUNE” selection.
Quick Point
The CW Spotting process utilizes the Spot tone or the
bar indicator, with the actual offset pitch being set by
the (CW) PITCH control on the front panel. The
offset pitch may be set to any frequency between 300
Hz and 1050 Hz, in 50 Hz steps, and you can either
match tones audibly (using the BK-IN/SPOT key)
or align the receiver frequency so that the central LED
on the bar indicator lights up. Note that there are 51
“dots” on the bar indicator, and depending on the reso-
lution selected, the incoming CW signal may fall out-
side the visible range of the bar indicator, if you are
not reasonably close to the proper alignment of tones.
The displayed frequency, on CW, normally reflects
the “zero beat” frequency of your offset carrier. That
is, if you were to listen on USB on 14.100.00 MHz to
a signal with a 700 Hz offset, the “zero beat” frequency
of that CW carrier would be 14.000.70 MHz; the lat-
ter frequency is what the FT
DX
9000D displays, by
default. However, you can change the display to be
identical to that of what you would see on SSB by
using Menu item “MODE-CW 050 CW-FREQ DIS-
PLAY” and setting it to “FREQ” instead of its default
“PITCH” setting.
BK-IN/SPOT switch PITCH knob
PITCH knob
Main Tuning Dial BK-IN/SPOT switch
: When the CW reverse feature is activated, the indication of the Tuning
Offset Indicator will also be reversed.
Retune (Shift to Frequency) Lower
Retune (Shift to Frequency Higher )
Zero-In