Vertex Standard FT-2000 ユーザーズマニュアル
Page 52
FT-2000 O
PERATING
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.
and/or signal strength conditions at the moment.
1. The Main [RF GAIN] knob should, initially, be ro-
tated to the fully clockwise position. This is the point
of maximum sensitivity, and counter-clockwise rota-
tion will gradually reduce the system gain.
of maximum sensitivity, and counter-clockwise rota-
tion will gradually reduce the system gain.
2. The Sub [RF GAIN] knob operates identically to the
Main [RF GAIN] knob. The fully clockwise position
of the Sub [RF GAIN] knob should always be utilized
as a starting point for operation.
of the Sub [RF GAIN] knob should always be utilized
as a starting point for operation.
A
DVICE
:
As the [RF GAIN] knob is rotated counterclockwise
to reduce the gain, the S-meter reading will rise. This
indicates that the AGC voltage being applied to the
receiver is increasing (which causes a reduction in re-
ceiver gain).
indicates that the AGC voltage being applied to the
receiver is increasing (which causes a reduction in re-
ceiver gain).
Rotating the [RF GAIN] knob 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.
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 [RF GAIN] knob operates identically to the
Main [RF GAIN] knob. The effects of counter-clock-
wise rotation of the Sub (VFO-B) receiver’s RF Gain
control may be observed visually on the Sub band
(VFO-B) S-meter.
wise rotation of the Sub (VFO-B) receiver’s RF Gain
control may be observed visually on the Sub band
(VFO-B) S-meter.
Q
UICK
P
OINT
:
Reception frequently can be optimized by rotating the
[RF GAIN] knob 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] knob. This set-
ting ensures that excessive gain is not being utilized,
without so much gain reduction that incoming signals
cannot be heard.
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] knob. This set-
ting ensures that excessive gain is not being utilized,
without so much gain reduction that incoming signals
cannot be heard.
The RF Gain control, along with the IPO and Attenua-
tor features, all affect the system receiver gain in dif-
ferent 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 fre-
quency is low enough to allow the preamplifier to be
bypassed. Thereafter, the RF Gain and Attenuator fea-
tures may be employed to provide precise, delicate
adjustment of the receiver gain so as to optimize per-
formance fully.
ferent 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 fre-
quency is low enough to allow the preamplifier to be
bypassed. Thereafter, the RF Gain and Attenuator fea-
tures may be employed to provide precise, delicate
adjustment of the receiver gain so as to optimize per-
formance fully.
C
ONVENIENCE
F
EATURES
Main [RF GAIN] Knob
Sub [RF GAIN] Knob