Receiver Accessories
RECEIVER
SQUELCH
The
SQURF
control's default position
(SQUELCH)
may be used to mute the receiver back-
ground
noise when no signal
is
present.
While
no
signals are being receiver, rotate the
SQLlRF
control clockwise until the back-
ground noise just disappears. This threshold point
is
where the best sensitivity to weak
signals will be obtained, along with quieting
ofthe
background noise.
RF
GAIN
Control
The
alternate use
of
the
SQLlRF
control
is
as
an
RF
GAIN control, which varies the gain
of
the
receiver'S RF and IF stages.
To
change the function
of
the
SQLlRF
control from
SQUELCH
to
RF
GAIN,
press and hold
in
the
[FUNC] key for
\12
second (to enter the Menu mode), then rotate the
SELECT
knob to
recall
MENU
#56 (SQL/RF GAIN). Next, rotate the MAIN DIAL to select
"RF"
instead
of
"SQL"
on
the Menu. Finally, press the [FUNC] key momentarily to save the new setting
and
exit
to
normal operation.
Under
particularly noisy or crowded conditions, counter-clockwise rotation
of
the
SQLI
RF
control may reduce the background noise level, making reception more pleasant. The
S-meter
will rise with increasing counter-clockwise rotation
of
the
SQLlRF
control; this
is
normal,
as
it
indicates the amount
of"AGC"
which
is
being applied so as to reduce the gain
of
the
receiver's RF and
IF
stages.
tt
'
'"
This
technique may be used in conjunction with the DSP jilters, so
as
to mini-
[!l
_ mize AGe-related "pumping"
ojthe
receiver output caused by strong adja-
~
. cent-frequency signals. In tlte
FM
and
FM-W
modes, the
SQLlRF
control
is
fIXed
in
the SQL mode,
and
cannot be set
to
the
RF
junction.
IPO
(INTERCEPT
POINT
OPTIMIZATION)
The
IPO
feature bypasses the receiver RF preamplifier, thereby eliminating the preamp's
gain
(which may not be needed on the HF bands below about
14
MHz).
I.
Press
the [FUNC] key,
as
needed, to select Operating Function Row 5 [lPO,
AD,
AGe,
NB]
on
the display.
2.
Press
the [A](IPO) key to bypass the receiver input preamplifier.
3.
Press
the [A](iPO) key once more to re-activate the preamp.
It
'
.'"
Thisjeature
is
not
available on the 144 MHz
and
430 MHz blinds.
~-
~
FT-100
MICRO
MOBILE
OPERATING
MANUAL
41
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General
Weight and Dimensions
