(4) MODE
The MODE switch
is
an eight position switch which
determines the appropriate detector and the filter in use.
In the
AM
position, a diode detector
is
incorporated and
the carrier oscillator
is
switched off. In the
CW,
RTTY,
and
SSB
(USB & LSB) positions, a ring demodulator
is
used
as
a detector with the appropriate carrier oscillator
turned on. In the
FM
position, an (optional)FM
detector unit
is
switched in. The appropriate filter
is
also
automatically selected by the MODE switch.
(5) AF-RF GAIN
The AF and
RF
GAIN control
is
a concentric double-
shaft potentiometer. The inner knob controls the audio
output
level
of
the receiver and the outer lever knob
controls the
RF
and IF gain
of
the receiver.
(6) SELECT
This switch provides the selection
of
an external VFO
or
one
of
four crystal-controlled oscillator positions. Nor-
mal operation
of
the FR-101 requires that the switch be
placed in the
"INT"
(Internal) position. When the switch
is
in the
"INT"
position, a red lamp marked VFO
is
lighted.
(7)
AGC
This switch selects the
AGC
time constant. In the
SLOW
position, the
AGC
time constant
is
0.75 second and
in
the FAST position, it
is
approximately 0.025 second. In
the
OFF
position,
AGC
voltage
is
not
generated. The
SLOW
position
is
normally used with
SSB
and
CW,
and
the FAST position
is
normally used for break-in
CW
and
RTTY. The
OFF
position may be used on
CW
under
difficult reception conditions in conjunction with the
RF Gain control
(8)
CLAR-TRANS
These controls use a concentric double-shaft potentiom-
eter. The CLAR (Clarifier) control -the inner knob -
provides a means
of
varying the receiver frequency a few
KHz to either side
of
the transmitting frequency when
the FR-101
is
used
as
a companion receiver
to
the
FL-101 or FT-101E/277E. Thus it
is
possible to set the
pitch
of
the voice you are receiving
to
the most readable
point without affecting your transmitting frequency.
The CLAR control may be switched
off
and the receiver
locked to the transmitting frequency
by
setting the
CLAR control to the
OFF
position. Normally, you will
want to keep the clarifier in the
OFF
position until the
initial contact
is
made. The CLAR control may then be
used to zero-in and correct any drift on the received
signal. With the clarifier
ON
position, a red lamp
is
lighted.
The TRANS (Transceiver) control
is
used to coincide the
receiving frequency with transmitting frequency when
the FR-101
is
used in conjunction with the FL-101 or
FT-101E/277E. Slowly advance the MONITOR knob
of
the FR-101 to monitor the transmitted signal, then
adjust the TRANS control for the most natural voice
quality while transmitting.
(9) PRESELECTOR
The PRESELECTOR control permeability-tunes the
antenna and RF coils
in
the receiver front-end. The scale
on this control
is
calibrated with the
wave
length
markings showing the correct setting for various bands.
This control has two pointers -red and white. The red
pointer corresponds
to
red band markings and the white
pointer to white band markings.
(10) MONITOR-SQUELCH
The MONITOR control
is
used to monitor the trans-
~itted
signal when the FR-101
is
used in transceive with
the FL-101 transmitter or FT-101E/277E transceiver.
The SQUELCH control adjusts the receiver squelch
threshold sensitivity in the
FM
reception mode (when
the optional
FM
detector unit
is
installed).
(11) VHF
The VHF switch selects the (optional) 6 meter and 2
meter VHF convertors. In normal reception, this switch
should be set to the HF position.
(12)
RF
ATT
The RF ATT
(RF
Attenuator) switch attenuates the
incoming signal
to
prevent over-loading
of
the front-end
when
an
extremely strong signal
is
present.
(13)
PHONE-RECORD
PHONE and RECORD jacks are provided for private
listening and recording when desired. The attenuator
resistor, R11,
is
connected to the PHONE jack in order
to
use
high sensitivity stereo headphones.
(14)
S-METER
The S-METER indicates the relative signal strength
of
a
received signal.
It
is
calibrated in S-Units from
S-1
to
S-9
and in
DB
over S-9.
(15) BAND INDICATOR
The BAND INDICATOR automatically indicates the
band in use when the BAND switch
is
set to the desired
band.
(16)
DIAL LOCK
The DIAL LOCK locks the dial for the dial calibration.
Fig.
I
