Cw Convenience Features; Cw Spotting (Zero-Beating) - Yaesu FT-950 Operating Manual

CW C
ONVENIENCE
"Spotting" (zeroing in on another CW station) is a handy technique to ensure you and the other station are precisely on the
same frequency.
The Tuning Offset Indicator in the display may also be moved so you can adjust your receiver frequency to center the
incoming station on the pitch corresponding to that of your transmitted signal.
Using the SPOT System
While pressing the front panel [ SPOT ] button, the Spot
tone will be heard through your speaker and the frequency
display will show the Spot tone frequency. This tone cor-
responds to the pitch of your transmitted signal. If you
adjust the receiver frequency until the pitch of the received
CW signal matches that of the Spot tone, your transmitted
signal will be precisely matched to that of the other sta-
tion.
Release the [ SPOT ] button to turn the Spot tone off.
A :
DVICE
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 in frequency may get
your call through.
The Tuning Offset Indicator in the display may be uti-
lized for CW frequency adjustment, as well. Its con-
figuration is set via Menu item "006 DISP BAR SEL
at the factory, and the Tuning Offset Indicator is al-
ready set to the "C-tn C-tn" selection.
C-tn C-tn
C-tn
Page 74
F
EATURES
( Z
CW S
POTTING
006 DISP BAR SEL 006 DISP BAR SEL" 006 DISP BAR SEL
006 DISP BAR SEL
)
-B
ERO EATING
[ SPOT ] Button
Q P :
UICK OINTS
The CW Spotting process utilizes the Spot tone or the
Tuning Offset Indicator. The actual offset pitch is set
by Menu item "045 A1A PITCH 045 A1A PITCH" (see page 112). The
045 A1A PITCH 045 A1A PITCH
045 A1A PITCH
offset pitch may be set to any frequency between 300
Hz and 1050 Hz, in 50 Hz steps. You can either match
tones audibly (using the [ SPOT ] button) or tune the
receiver frequency so that the central red LED on the
Tuning Offset indicator lights up. Note that there are
21 "dots" on the Tuning Offset Indicator, and depend-
ing on the resolution selected, the incoming CW sig-
nal may fall outside the visible range of the bar indica-
tor, if you are not reasonably close to the proper align-
ment 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 latter
frequency is what the FT-950 displays, by default.
However, you can change the display to be identical to
what you would see on SSB by using Menu item "047
A1A FRQDISP" and setting it to "dIr
A1A FRQDISP A1A FRQDISP
A1A FRQDISP A1A FRQDISP
default "OFSt OFSt" setting.
OFSt OFSt OFSt
FT-950 O
047 047
047 047
dIr" instead of the
dIr dIr
dIr
M
PERATING ANUAL