Page 67
FT
DX
9000MP O
PERATION
M
ANUAL
RF G
AIN
(
SSB/CW/AM M
ODES
)
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.
M
AIN
(VFO-A) RF G
AIN
A
DJUSTMENT
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.
S
UB
(VFO-B) RF G
AIN
A
DJUSTMENT
The Sub (VFO-B) receiver’s [
RF GAIN
] control operates
identically to the Main band (VFO-A) [
RF GAIN
] con-
trol. The effects of counter-clockwise rotation of the Sub
receiver’s [
RF GAIN
] control may be observed visually
on the Sub band (VFO-B) S-meter.
A
A
A
A
A
D
D
D
D
DVICE
VICE
VICE
VICE
VICE
:
As the [
RF GAIN
] control 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 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.
CCCCC
ONVENIENT
ONVENIENT
ONVENIENT
ONVENIENT
ONVENIENT
F F F F F
EA
EA
EA
EA
EATURES
TURES
TURES
TURES
TURES
VDD
TEMP
SWR
BIAS
A
A
A
A
A
D
D
D
D
DVICE
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 po-
sition 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.
SUB(VFO-B) [RF GAIN] Knob
MAIN(VFO-A) [RF GAIN] Knob
Q
Q
Q
Q
Q
UICK
UICK
UICK
UICK
UICK
P
P
P
P
P
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 environ-
ment, 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
provide precise, delicate adjustment of the receiver
gain so as to optimize performance fully.
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