Tools For Comfortable And Effective Reception; Rf Gain - Yaesu FT dx 1200 Operating Manual

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The RF Gain control provides manual adjustment of the gain levels for the receiver RF and IF stages, to account for
noise and signal strength conditions at the moment.
1. The [ RF/SQL ] knob should, initially, be rotated
to the fully clockwise position. This is the point of
maximum sensitivity.
2. Counter-clockwise rotation of the [ RF/SQL ] knob
will gradually reduce the system gain.
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 As the [ RF/SQL ] 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 (this causes a reduction in re-
ceiver gain).
 Rotating the [ RF/SQL ] knob control to the fully
counter-clockwise position will essentially disable
the receiver, as the gain will be greatly reduced. In
this case, the S-meter will appear to be "pegged"
against the right edge of the analog S-meter scale.
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 Reception frequently can be optimized by rotating
the [ RF/SQL ] knob slightly counter-clockwise to the
point where the "stationary" meter indication is set
just about the same as the incoming noise level. This
will reduce the RF gain to find a level of improved
signal to noise ratio.
 The RF Gain control, along with the IPO and the At-
tenuator features, all affect the system receiver gain
in different ways. The IPO generally should be the
first feature engaged when dealing with a high noise
level, or a crowded, high-level signal environment.
Also, 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 to
fully optimize performance.
You may switch the [ RF/SQL ] knob from the RF Gain Function to the Squelch Function via Menu item 038.
1. Press the [ MENU ] button to engage the Menu
mode.
2. Rotate the [ VFO-B/CLAR ] knob (or press the
/ button) to select Menu item "038 RF/SQL
VR", then press the [ SELECT ] button.
3. Rotate the [ VFO-B/CLAR ] knob (or press the
/ button) to select "SQL" (replacing the de-
fault "RF" selection).
4. Press the [ SELECT ] button, then press the
[ MENU ] button to lock in the new setting and
exit to normal operation.
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Switching the Knob Functions
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[ RF/SQL ] Knob
[ MENU ] Button [ SELECT ] Button
[/] Button
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[ VFO-B/CLAR ] Knob
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