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DRAKE R8B Owner's Manual Page 30

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Page view 29
Clock and Timer Functions cont'd. 28
R8A
USE PINS 2 & 5 TO
CONTROL MOTOR
TO "PAUSE" OR MOTOR
CONTROL ON/OFF
FIGURE 16
TO "LINE AUDIO IN"
LINE AUDIO
OUT
TIMER
BATTERY POWERED
RECORDER
No
Connection
Common
13
45
2
Normally Open
(Timer On)
Normally Closed
(Timer Off)
Figure 15 Timer Connections
Contacts shown with TIMER OFF
Rear Panel View
Pin 1:
Pin 2:
Pin 3:
Pin 4:
Pin 5:
No Connection.
Timer Relay Common Connection.
This connection switches between Pins 3 and 5
depending on the state of Timer 1 or 2.
Timer Relay Normally Closed Connection.
Connected to relay Common when Timer 1or
2 is OFF.
Chassis Ground Connection.
Timer Relay Normally Open Connection.
Connected to relay Common when Timer 1 or
2 is ON.
As mentioned above, a common usage of the
internal timer relay is to control a tape recorder
to provide automatic, unattended recordings
of received programs. By programming Timer 1
or 2 On/Off times into the receiver, the re-
corder will be turned On at the Timer ON time,
record the program, and then turn off at the
Timer OFF time.
A typical connection diagram is shown in
FIGURE 16 .
TIMER CONNECTOR INTERFACE
A standard 5 pin DIN connector located on the rear panel
provides the connections for unattended, programmed
Timer control of cassette recorders, RTTY or FAX demodu-
lators, etc. Please refer to Figure 15 for a pin by pin
description of this connector.
WARNING!!!
DO NOT USE TIMER CONNECTIONS TO SWITCH STANDARD
120 VAC LINE OPERATED EQUIPMENT DIRECTLY. MAXIMUM
RATINGS OF TIMER CONNECTIONS ARE 30 VDC AT 1 AM-
PERE. IF IT IS NECESSARY TO SWITCH THE 120 VAC LINE
UNDER TIMER CONTROL, IT WILL REQUIRE THE ADDITION OF
AN EXTERNAL RELAY WITH THE PROPER CONTACT RATING
THAT IS DRIVEN FROM THE RECEIVER's TIMER CONNECTOR.
Page view 29
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