FT-2000
Operating Manual
Vertex Standard Co., Ltd.
49
If background noise causes the S-meter to deflect on clear frequencies, press the
[ATT] button until the S-meter drops to about “S-1.” This setting optimizes the
trade-offs between sensitivity, noise, and interference immunity. Also, once you
have tuned in a station you want to work, you may want to reduce sensitivity
further (or add more attenuation) by pressing the [ATT] button to a more setting.
This reduces the strength of all signals (and noise) and can make reception more
comfortable, important especially during long QSOs. When looking for weak signals
on a quiet band, you will want maximum sensitivity, so the IPO should be disabled
and the [ATT] button should be set to “OFF.” This situation is typical during quiet
times on frequencies above 21 MHz, and when using a small or negative-gain
receiving antenna on other bands.
RF Gain (SSB/CW/AM Modes)
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.
1. The Main [RF GAIN] knob 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.
2. The Sub [RF GAIN] knob operates identically to the Main [RF GAIN] knob. The
effects of counter-clockwise rotation of the Sub (VFO-B) receiver’s RF Gain control
may be observed visually on the Sub band (VFO-B) S-meter.
Advice:
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
(to reduce the gain) is increasing.
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.
The Sub [RF GAIN] knob operates identically to the Main [RF GAIN] knob. The
effects of counter-clockwise rotation of the Sub (VFO-B) receiver’s RF Gain control
may be observed visually on the Sub band (VFO-B) S-meter.
Advice: 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.
