by
the transmitter.
When in the N. B. position the noise blanker
is energized,
and when in the CAL position, the noise blanker is
switched off and the calibrator is switched on. In these last two
positions the muting function is the same as if the switch were in
the EXT-MUTE position,
so if external muting is not used, a shorted
plug must be inserted in the Mute jack to obtain these functions.
6.
SSB/CW-AM
-
This switch determines the detector which is used and
the AVC mode.
When in the AM position,
a diode detector is incorpor-
ated, the BFO is switched off, and the AVC with a slow time constant
is used.
The other three positions under the heading SSB/CW employ
a product detector with the BFO.
In the SLOW AVC position the AVC
delay time is about
.7
5 seconds.
In the FAST AVC position it is approx-
imately
.025
seconds.
In the AVC OFF position no AVC is generated.
The SLOW AVC position should normally be used with single sideband
and CW and the fast position should normally be used for break-in
CW and RTTY. The AVC OFF position should be used only on CW
under difficult conditions in conjunction with the RF gain control.
7.
AF GAIN
-
The A. F. GAIN knob controls the audio output level of
the receiver.
8.
RF GAIN
-
The R.F. GAIN knob varies the bias applied to the AVC
-
controlled tubes thus controlling the R. F. gain of the unit.
9.
NOTCH
-
The NOTCH control tunes a highly selective notch across
the receiver’s
passband
for the purpose of eliminating interfering
carriers .
When turned to the OFF position, the Notch is moved out-
side the receiver’ s pa ssband.
Rotation of this control is in the same
direction from the center as
PASSBAND
control; i. e. If
PASSBAND
is
set to the left side (lower sideband) then heterodynes will be removed
with NOTCH set left of center.
10
?)
PASSBAND
-
The
PASSBAND
control is composed of two parts; the
pass-
band selector lever and the
passband
tuning knob. The selector lever
is calibrated in numbers representing the band widths in KC’s at 6 DB
down(.4,
1.2, 2.4,
and 4.8KC).
The length and position of the lines which make up the
passband
tuning
calibration indicate the relative band widths and their positions with
respect to each other.
The pointer on the
Passband
tuning knob repre-
sents the relative position of the fixed 50 KC BFO with respect to the
movable passbands.
The dots at the ends of the lines indicate the cor-
rect settings of the
PASSBAND
tuning knob for single sideband reception.
All of the left hand dots are for lower sideband and all of the right hand
dots are for upper sideband.
-lO-
(9 paginas)
(11 paginas)
(472 paginas)
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