Cw Spotting (Zero-Beating); Using The Auto Zeroing System; Using The Spot System - Yaesu FT DX 3000 Operating Manual

Hf/50 mhz transceiver
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"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 Auto Zeroing System

Press the [ p /q /t /u ] button to select the "ZIN/
SPOT". Press the [ SELECT ] switch momentary to ad-
just the receiving frequency to the zero-in automatically
while receiving the CW signal.

Using the SPOT System

Press the [ p /q /t /u ] button to select the "ZIN/
Press the [ MONI ] button, then while pressing
SPOT".
the front panel [ SELECT ] button, the Spot tone will be
heard through your speaker. This tone corresponds to the
pitch of your transmitted signal. If you adjust the receiv-
er 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 station.
Release the [ SELECT ] button to turn the Spot tone off.
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 In a tough DX pile-up, you may actually want to
use the SPOT system to find a "gap" in the spread
of calling 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
utilized for CW frequency adjustment, as well. Its
configuration is set via Menu item "010 BAR DIS-
PLAY SELECT" at the factory, and the Tuning Offset
Indicator is already set to the "CW TUNE" selection.
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 The CW Spotting process utilizes the Spot tone or
the Tuning Offset Indicator. The actual offset pitch
is set by Menu item "054 CW PITCH". The 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 [ SELECT ] button) or tune
the receiver frequency so that the central red marker
on the Tuning Offset indicator lights up. Note that
there are 31 "dots" on the Tuning Offset Indicator,
and depending on the resolution selected, the incom-
ing CW signal may fall outside the visible range of
the bar indicator, if you are not reasonably close to
the proper alignment of tones.
FT
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[ SELECT ] Button
[ MONI ] Button
Retune: Shift to Higher Frequency
Retune: Shift to Lower Frequency
Zero-In
 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" fre-
quency of that CW carrier would be 14.100.70 MHz;
the latter frequency is what the FT
by default. However, you can change the display to
be identical to what you would see on SSB by using
Menu item "064 CW FREQ DISPLAY" and setting
it to "DIRECT FREQ" instead of the default "PITCH
OFFSET" setting.
F
eaTureS
ZIN/SPOT Indicator
3000 displays,
DX
Page 81

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