*)
'-*J
MODBL
III
Model
for full
through
fically
may
also
nr
its
.
420
Frequency
band coverageof
twenty
intended
be
200-kc
for
used
for
fixed
mobile
Control
80, 40,
ZO,
segments.
portable
and
operation,
Unit is
15,
The
unit
operation
and
if
CIRCUIT THEORY
the 2N706
Q1,
mon
base configuration as
Figure
iel with
coil,
effectively
percent
tional
7.
Capacitors
C1931,
L1901.
tap the
of the tank
stability.
for matching the
transceiver,
the
switching
L1901, and
L1902
is accomplished
providing
through
tuning range.
when using the
Oscillator,
C1901
the
main
tuning
Capacitors
oscillator
circuit.
the
Q2,
Emitter
impedance
not
for
stability
vernier
L1921 for
C1932
crystal
setting the
provides
calibrator.
operates
a
Colpitts
and
oscillator.
C1902
control, across the
C1933, C2001
across only
'fhis
results in excepFollower, is used
the
of
coaxial cable to
purposes.
tapping the
by
adjustments
low
vernier dial
are in
and
about 10
main
end of
INSTALLATION
420
Model
common mounting with
Control Unit
is
furnished with
may
be
transceiver.
the
mounted
a mounting
on
either
The
side of thc
transceiver.
ALICNMENT
Alignment of the
general
of a
ranges
receiver
coverage receiver
between 8
mc
and
is not critical since
in the transceiver is used for
the receiver
selection of
alignment
set
must
the
may
proper
be accurate
made with
be
Model
24 mc.
100
kc
420
requires only the use
tuning
the frequency
Calibration
the
crystal calibrator
adjustment,
final
within
50
kc
harmonic.
the dial
set
FORMINOR FREQUENCYADJUSTMENTS,
required
be
after the initial aging
move the cabinet cover and
trimmer
capacitor
marked for the
period,
carefully adjust
very
specific range.
420
FREQUENCY
*..-dc.lt"
designed
10 meters,
is
speci-
but
per-
space
the
in
Com-
See
paral-
C2004
Band-
coil
coils,
the
setting
for
base
Frequency
of the
but
permit
to
Vernierdial
knob.
which may
simply re-
the
CONTROL UMT
FOR MAJOR FREQUENCY
Tune Frequency
quency
verage
table
just
range, and locate
receiver at frequency indicated in
with
vernier coil
dial set
Controi
heterodyne with
at midpoint
to
bring
heterodyne
of the receiver frequency,
and adjust
tuning to high
Move
trimtner
end
Coil and
capacitor
adjustments
capacitor
BAND
vernier coil
for
of tuning range
end
for zero
until calibration
locatioris
RCVR
FREQ.
(kc)
4-3.6
3.
3.6-3.
3.8-4.0
'7
i_,7 '
7
,2-7
.4
8
8573
8773
8973
L2,173
L2,373
14.0-14.2 8827
14.2-14.4
14.8-15.0
2r.0-2r.2
2r.2-2r,4
2r,4-2L.6
28.0-28.2
28.2-28,4
28.4-28.6
28.6-28.8
28.
8-29. 0 23,627
29.0-29,2
29.2-29.4
29.4-29.6
29.6-29.8
9027
9627
15,827
76,027
16,227
22,927 L19
23,027
t2 Otn
23,427
23,827 L1905
24,027
24.227 L19 03
24,42'1
ADIUSTMENTS
Unit to
(dot
low
straight
within a few kc
then
zero
switch
on calibrator
with calibrator.
beat
and adjust
beat.
Repeat
is correct
are
marked
ADJUST
COIL
(low
end)
L192r
LI92O
I lq1cl
L1918
L19 i7
L19 i6
r5
L19
L1914
L1913
T lQ19
L1911
10
T 1ono
L19
08 c1909
1907 c1908
L
06
L19
L1904
L 1902
end of fregeneral
co-
following
up),
ad-
high and low
at
bothends.
the unit
in
ADJUST
CAP.
(high
end)
ci929
c1927
C TYZS
c1923
c1921
c1920
c1918
UIYIb
cr914
c1913
c1912
c1911
c1910
c1907
c1906
c1905
c1904
c1903
19
III MODEL
420
FREQUENCY
CONTROL
UNIT
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