
3.
OPERATION
Refer to Figure 3 for the location of the operating controls.
3.1
OPERATING
CONTROLS
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
The
S-meter
indicates the relative level of the received signals .
The
crystal selector switch
selects
the band determining crystals .
The
top line of the
dial
sector reads the lowest frequency of each
band in MHz, the middle line indicates the approximate position for
tuning the preselector and the bottom line indicates the proper
sett-
ing of the range switch.
The main tuning
dial
reads 0 to 500 kHz with 1 kHz graduations.
When the tuning
dial
reading is added to the crystal
dial
reading ,
the actual received frequency is indicated to 1 kHz.
The main tuning
dial
consists
of two concentric transparent discs
that
rotate
at
different speeds .
Zero to 100 kHz is indicated on
one
disc and hundreds of kHz are indicated on the other disc. The
dial
may
be calibrated by rotating the skirt with respect to the knob.
The preselector is set to the position indicated by the number on the
middle line of the crystal selector
dial
and then fine tuned for peak
signal .
The range switch sets up the proper tuned circuits to
cover
the
de-
sired band of frequencies .
It is set to the position indicated on the
bottom line of the crystal selector dial.
The headphone jack mates with a standard 1/4 inch phone
plug.
Con-
necting the headphones to the receiver
will
turn off the speaker.
The audio gain control adjusts the audio output to the proper level.
The RF gain control controls the gain of the receiver for
all
signals
which are below the AVC threshold level to which the control is set.
This control is normally set in the full clockwise position. Counter-
clockwise rotation reduces the gain of the receiver.
The mode selector switches in a
product
detector for CW and SSB or
a diode detector for AM.
The proper I. F. bandwidth and AVC time
constant is also selected.
The notch control
may
be used to eliminate or reduce an interfering
heterodyne or CW signal. The off position, which is shown in
Figure 2, has a positive detent.
Counter-clockwise rotation of the
-
ll-
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