DRAKE R8A - Rear Panel Description; AC LINE Voltage Selector; Interface RS-232 C

13 Rear Panel Description
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EXT 11- 16 VDC IN
DISCONNECT FROM
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WOVAC 400 mA
T20VAC 400 mA
200VAC 200 mA
240VAC 200 mA
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REPLACE FUSE AS MARKED AFTER
DISCONNECTING UNIT FROM AC LINE
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FIGURE 6 REAR PANEL
1) CONV - This connector is the antenna input to the
optional VHF Converter. Attach a 50 OHMS nominal
impedance coaxial feed line from the antenna. This
connector accepts a standard PL-259 plug.
2) ANT 1 - This connector is used when attaching receiving
antennas with coaxial feed lines of 50 OHMS nominal
impedance. Accepts a standard PL-259 plug.
3) ANT 2 - This connector can be used to attach either a
low impedance (50 OHMS nominal) or high impedance
(500 Ohm nominal) antenna. The center clip is ground
and its connection should be as short as possible.
4) EXT 11-16 VDC IN - This connector is used for powering
the receiver from an external DC source such as a car
battery. Observe proper polarity when attaching wires.
This connector is internally protected from reverse polar-
ity,
5) DC Fuse - This is a 2 ampere type T fuse. Replace with
same type and rating.
6) AC LINE Voltage Selector - This switch is used fo select
the proper line voltage setting for your particular area. BE
CERTAIN OFTHE OPERATING VOLTAGE BEFORE CONNECT-
ING THIS RECEIVER TO THE MAINS SOURCE. Also, the
proper mains fuse and line cord may need fo be installed.
See Items (7) and (8).
7) Fuse - Check for proper fusing prior to connecting this
receiver to the mains source (see page 4). Fuse is5x20mm
SLO-BLO®, T400 mA for nominal 115/127 VAC operation;
T7200 mA, 250V for nominal 220/240 VAC operation.
8) Power Line Cord Receptacle - This receptacle accepts
athree-wire power cable. When the cable is connected
to an appropriate power line outlet, the instrument is
grounded.
This unit is shipped with a cord intended for nominal 115/
127 VAC mains supply. For operation of this unit on
nominal 220/240 VAC mains supply, use the proper cable
assembly approved by your local codes.
9) GND (Ground) - The earth ground wire connected here
should be as short as possible.
10) TIMER - This 5 pin din connector provides switching
contacts for on/off control of an external device such as
acassette tape recorder. Refer to CLOCK & TIMER FUNC-
TIONS page 25.
11) MUTE - The RCA connector provides a method of
muting the receiver for use with a transmitter. Ground
center pin to mute.
12) Interface RS-232C -This 9 pin DB-9 connector provides
a standard RS-232C interface to a keyboard terminal.
Refer to RS-232C INTERFACE page 30.
13) LINE AUDIO OUT - Both RCA connectors provide a
constant low level audio source independent of the
setting of the volume control. They are designed to
interface to tape recorders, CW/RITY demodulators,
amplifiers, etc.
14) EXT (External Speaker) - This connector accepts a
standard 1/4° diameter, 2-circuit, (monaural) phone plug
for connection of a 4-8 ohm external speaker.
15) Speaker Switch (INT/BOTH/EXT) - This 3 position switch
allows selection of internal only, both internal and exter-
nal, or external only speaker outputs.