INV RF INHIB
As above except inverted.
GND = RF enabled, Not Connected = RF Inhibited.
SWITCH SENSE Part of the redundant switch control facility, provides the
waveguide switch position tell-back input. Should be connected to
the waveguide switch so that this pin is connected to ground when
the amplifier is routed to the dummy load.
GND = RF output routed to dummy load, Not Connected = RF
output routed to the antenna.
RED FLT I/P
Part of the redundant switch control facility, receives the status
feedback signal from the other amplifier. When the other amplifier
indicates a fault condition, the RF output from this unit should be
switched to the antenna. This pin should be connected externally to
the RED FLT O/P (Pin k on the user interface connector) of the
other amplifier in the redundant switch system.
GND = Other amplifier operational, Not Connected = Fault on
other amplifier, therefore switch.
EXT INTLK
An external interlock input that operates as a fault trip. If the EXT
INTLK input is opened whilst the amplifier is in the XMIT mode, the
amplifier is automatically placed into the STBY mode. In order to
return to the XMIT mode the EXT INTLK input must first be closed
(reset conditions are detailed in section 5.2.1). If the external
interlock is open in any other mode, the fault condition is indicated
but the amplifier mode is not changed. If this feature is not required,
this pin should be linked to GND within the 41-pin user interface
connector.
GND = XMIT available, Not Connected = Inhibit XMIT.
5.2.6
Control Inputs - Type 3
The following control inputs set the modes of operation of the unit. They are
designed to be linked within the 41-pin user interface connector during equipment
installation and therefore do not form part of the everyday control functions of the
unit. To set the mode, the appropriate pins should be linked to +15 V (pin U on the
user interface connector).
Maximum external link resistance. . . . . . . . . . . . . . . . . .
100
O
Note:
Although designed to operate using the internally gen15 V, with local
links, an external supply can be used to remotely set these modes of operation. Any
external supply should be capable of nom15 V @ 5 mA per pin and should
conform to the following requirements:
Maximum logic 0 voltage . . . . . . . . . . . . . . . . . . . .
0.8 V dc
Minimum logic ‘1’ voltage. . . . . . . . . . . . . . . . . . .
+12 V dc
Maximum logic ‘1’ voltage . . . . . . . . . . . . . . . . . .
+30 V dc
ADD 0
ADD 1
ADD 2
ADD 3
ADD 4
ADD 5
Six binary coded discrete lines that allow the user to set the
address of the unit when using the RS-422 or RS-485 serial
communications interfaces (this hardware address select mode
is only active when ADD SEL is not connected to +15 V).
+15 V = binary ‘1’, Not Connected = binary ‘0’.
HBN63xx-1, Issue 8, Page 24
