Yaesu FT DX 9000 CONTEST - 2, Operation Manual, Page: 145 / 168

Page 143 FT
DX
9000 C
ONTEST
O
PERATION
M
ANUAL
D
UAL
R
ECEIVE
U
NIT
(
RXU-9000
)
RF G
AIN
-- SSB/CW/AM M
ODES
--
When the optional Dual Receive Unit ( RXU-9000 ) is installed, the RF Gain levels of the VFO-A and VFO-B may be
adjusted independently.
As a reminder, there is no difference in the fundamental performance of the two VFOs. Please see page 53 for details.
VFO-A RF Gain Adjustment
The VFO-A RF GAIN control (# ) should, initially,
be rotated to the fully clockwise position. This is the point
of maximum sensitivity, and counter-clockwise rotation
will gradually reduce the system gain.
As the RF GAIN control (# ) is rotated counter-
clockwise to reduce the gain, the S-meter reading will
rise. This indicates that the AGC voltage being applied
to the receiver (to reduce the gain) is increasing.
Rotating the RF GAIN control (#
) to the fully
counter-clockwise position will essentially disable the
receiver, as the gain will be greatly reduced. In this
case, as well, the S-meter will appear to be “pegged”
against the right edge of the analog S-meter scale.
VFO-B RF Gain Adjustment
The VFO-B RF GAIN control (# ) operates identi-
cally to the VFO-A RF Gain control. The effects of counter-
clockwise rotation of the VFO-B RF Gain control may be
observed visually on the VFO-B S-meter.
As the RF GAIN control (# ) is rotated counter-
clockwise to reduce the gain, the S-meter reading will
rise. this indicates that the AGC voltage being applied
to the receiver (to reduce the gain) is increasing.
Rotating the RF GAIN control (#
) to the fully
counter-clockwise position will essentially disable the
receiver, as the gain will be greatly reduced. In this
case, as well, the S-meter will appear to be “pegged”
against the right edge of the analog S-meter scale.
Advice
Reception frequently can be optimized by rotating the RF
GAIN control slightly counter-clockwise to the point
where the incoming noise level is just about the same as
the “stationary” meter needle position as set by the adjust-
ment of the RF Gain control. This setting ensures that ex-
cessive gain is not being utilized, without so much gain
reduction that incoming signals cannot be heard.
Quick Point
The RF Gain control, along with the IPO and Attenuator
features, all affect the system receiver gain in different
ways. As a first step in dealing with high noise or a crowded,
high-level signal environment, the IPO generally should
be the first feature engaged, if the frequency is low enough
to allow the preamplifier to be bypassed. Thereafter, the
RF Gain and Attenuator features may be employed to pro-
vide precise, delicate adjustment of the receiver gain so as
to optimize performance fully.
VFO-B RF GAIN Knob VFO-A RF GAIN Knob
VFO-A
VFO-B