Rf Gain (Ssb/Cw/Am Modes) - Yaesu FTDX9000D - DATA MANAGEMENT Operation Manual

C F
ONVENIENT EATURES
The RF Gain controls provide manual adjustment of the gain levels for the receiver RF and IF stages, to account for noise
and/or signal strength conditions at the moment.
Main (VFO-A) RF Gain Adjustment
The Main (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 counterclock-
wise 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.
The Sub (VFO-B) receiver's [ RF GAIN ] control op-
erates identically to the Main band (VFO-A) [ RF
GAIN ] control. The effects of counter-clockwise ro-
tation of the Sub receiver's [ RF GAIN ] control may
be observed visually on the Sub band (VFO-B) S-
meter.
Page 64
( SSB/CW/AM M
RF G
AIN
SUB (VFO-B) [ RF GAIN ] knob
)
ODES
MAIN (VFO-A) [ RF GAIN ] knob
A A A A A
D D D D D VICE VICE VICE VICE VICE
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 adjustment of the [ RF GAIN ]
control. This setting ensures that excessive gain is
not being utilized, without so much gain reduction
that incoming signals cannot be heard.
Q Q Q Q Q P P P P P
UICK UICK UICK UICK UICK OINT OINT OINT OINT OINT
The RF Gain control, along with the IPO and At-
tenuator 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 envi-
ronment, the IPO generally should be the first fea-
ture engaged, if the frequency is low enough to
allow the preamplifier to be bypassed. Thereafter,
the RF Gain and Attenuator features may be em-
ployed to provide precise, delicate adjustment of
the receiver gain so as to optimize performance
fully.
FT 9000D O
DX
M
PERATION ANUAL