Modules
R&S
®
OSP
129
User Manual 1178.7100.02 ─ 05
The type of relays is monostable (or "failsafe"), hence, with no voltage applied, an RF
connection is provided from C to NC, while NO is not connected to C ("Pos = 0"). To
disconnect NC and connect C to NO ("Pos = 1"), a continuous voltage must be applied
to the relay.
The relays are mounted directly into the module's panel and soldered to the module's
printed board, to avoid relay cabling and allow a compact module size.
SP8T
relay:
The terminal port is labeled with C (common), the other relay ports are labeled with
numbers.
The relay type is monostable (or "failsafe open"). Hence, with no voltage applied to the
relay, no RF connection is provided from terminal C to any of the numbered ports. To
establish an RF connection between C and one of the numbered ports, a continuous
voltage must be applied to the corresponding power terminal of the relay.
The relay is mounted directly into the module's panel and soldered to the module's
printed board, to avoid relay cabling and allow a compact module size.
The firmware of the switch unit ensures to activate only one out of the eight terminal
connections in the SP8T relay at a time.
The switch unit provides power supply and control via a single module bus cable to a
module bus connector on the module's printed board. The module's on-board memory
stores its configuration data.
Figure 3-117: Pinout and block diagram of RF switch module R&S
OSP-B129 (internal termination of
open SP8T ports indicated)
R&S
OSP-B129 RF Switch Module
