Adjacent Channel Monitor (Acm) -- Cw Mode Only - Yaesu FT DX 9000 CONTEST - MANUAL 2 Operation Manual

D R
UAL ECEIVE
A
DJACENT
When the optional Dual Receive Unit (RXU-9000) is installed, the Adjacent Channel Monitor will be available for use
(because it utilizes the second receiver to provide the ACM function). ACM utilizes the VFO-B to monitor a 2.4 kHz
window outside your current CW passband (for example, 500 Hz) for the VFO-A. The peak signal strengths within this 2.4
kHz window are displayed on the VFO-B S-meter, alerting you to encroachment from other stations.
To activate the Adjacent Channel Monitor, press the
ACM switch (# ). The LED imbedded in the switch
will glow Red.
Advice
If you do not have Dual Receive engaged, turning on
the ACM feature will cause the RX LED associ-
ated with the VFO-B to become illuminated.
When ACM is turned on, the frequency of the VFO-B
will automatically be set to match that of the VFO-A.
When operating on Dual Receive, engaging the ACM
feature automatically sets the VFO-B to the same fre-
quency as the VFO-A, and by inverting the DSP filter
the VFO-B is used for monitoring (visually) for activ-
ity outside your current receiver passband on the VFO-
A.
When ACM is turned on during Dual Receive operation, the audio from the VFO-B will disappear.
A typical operating circumstance where ACM can help is when you are running stations during a contest in a 250 Hz
bandwidth. If stations suddenly stop calling you, it may be because another strong station has started calling CQ near
your frequency. By engaging ACM, your VFO-B S-meter will display the strongest station on the area ± 1.2 kHz
from your current operating frequency; if the encroaching station is sufficiently close, you might want to ask him or
her kindly to QSY.
Advice
By rotating the VFO-B AF GAIN control (#
control (# ) to a comfortable listening level, you will be able to hear the desired signal within the 300 Hz passband
selected.
In addition, if you rotate the VFO-A AF GAIN control fully counter-clockwise, then advance the VFO-B AF
GAIN control, you will be able to hear audio from the passband 1.05 kHz on either side of the VFO-A's 300 Hz
passband, but you will not hear the audio from within that 300 Hz passband. In other words, you can monitor
everything outside the selected 300 Hz bandwidth, but within a 2.4 kHz window, by advancing the VFO-B AF
GAIN control.
Page 142
( RXU-9000 )
U
NIT
C M
HANNEL ONITOR
) fully counter-clockwise, then setting the VFO-A AF GAIN
300Hz
1.05 Hz 1.05 Hz
ｋ
FT
( ACM )
-- CW M
ODE
ｋ
9000 C O
DX ONTEST
--
O
NLY
ACM Switch
M
PERATION ANUAL