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3.3 Oscillator Stability:—
(a) Oscillator frequency stable within 0.001%
for line voltage variation of ± 5%.
(b) Oscillator frequency stable within 0.003%
for temperature change of 1°C.
(c) Oscillator frequency stable within 0.001%
for total variation of both the audio and
R.F. gain controls.
(d) Resetting of range switch from either direc-
tion does not vary the frequency of the
oscillator on any band more than 1 kc.
3.4 Dial Resetability better than 2 kc. when the dial
is reset from either direction, at any frequency.
3.5 Dial Calibration:—Calibration of the dial is accu-
rate to within 0.5%.
3.6 AVC Characteristics: The AVC circuit holds
the audio output level to 15 db when the MCW
(A-2) input is varied between 10 and 100,000
microvolts at any frequency, with any modula-
tion percentage from 10 to 90, and with any
modulation frequency from 300 to 4000 cycles.
(See Figure 14.)
4. INSTALLATION
4.1 Power Supply:—The power supply circuit is
integral with the receiver. Determine line volt-
age and frequency and check with the rating of
the receiver. The power transformer primary
may be connected for either 115 or 230 volts
25/60 cycle by means of the toggle switch on
the rear apron. This toggle switch is protected
by a protector plate. To alter the connection of
the primary, remove the protector plate, throw
the switch, and replace the protector plate, with
the reverse face out.
4.2 For Battery or Other Supply Operation:—For
connections see Schematic Diagram Figure 11.
It is only necessary to remove the plug from the
socket on the rear of the receiver, and connect
the batteries to the proper terminals as indi-
cated by the schematic diagram. A battery
cable terminating in an octal male plug is neces-
sary for this purpose.
If the Vibrator Power Unit MI.22216 is used,
remove the plug from the socket on the rear of
the receiver, and plug in the cable from the Vi-
brator Power Unit. Connect the 6 volts D.C.
input to the power unit with heavy, low resist-
ance leads. See Section 7. for more detailed
information concerning the Power Unit.
4.3 Valves:—Inspect the chassis before applying
L./NE VOLTAGE
ADJUSTMENT 51V/TCN
TB 4
$
power to see that all valves are firmly seated in
their respective sockets.
4.4 Antenna:—The input impedance at the antenna
terminals is designed to match a 100 to 200 ohm
transmission line or a straight wire capacity type
antenna.
For general use it is recommended that a
straight wire antenna between 25 and 50 feet
long be used for bands 3 to 6 inclusive, and a
wire of 200 feet or more for bands 1 and 2.
4.5 Speaker:—Terminals for connection of a loud-
speaker are indicated in Figures 3 and 7. The
output transformer is designed to match a p.m.
dynamic speaker having 2.5 ohms impedance.
4.6 Headphones:—A jack is provided on the left of
the front panel for plugging in a pair of head-
phones. If additional phones are required, they
may be connected to the 20 ohm output ter-
minals on the rear apron of the receiver. Phones
having an impedance in the range of 100 to 600
ohms should be used.
4.7 Mounting:—The instrument may be placed on
a table or mounted on a rack. For rack mount-
ing loosen the panel mounting screws and re-
move the front panel and chassis complete from
the cabinet. Then mount on rack by means of
the slots at the sides of the panel.
ANTENNA CO/L /NOUCTANCE
R
CA - 1/00-97
ADJUSTMENTS Poe ALL. BANOS
GA5 GAP
PROTEr TOE
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ETC. REMOVE PLUG,/` CONNECT
BATTERY TO soct - Er( -/)
Figure 3.—General Purpose Communications Receiver—Rear Apron
[ 7 1
D/UE.eS/TY
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