Keysight L7222C, Operating And Service Manual

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General Information
Keysight
L7222C Coaxial Transfer Switch Operating
and Service Manual
3
Driving the Switch
There are two positions for the L7222C coaxial transfer switch. See
Figure 3 . Position A has RF Port 1 connected to RF Port 2 and RF Port 3
connected to RF Port 4. Position B has RF Port 2 connected to RF Port 3 and
RF Port 1 connected to RF Port 4. Either switch can be driven with a
standard grounding drive control with or without a separate ground. Single
line or Dual line TTL control are also available. The switch operates in a
break-before-make mode.
Figure 3 (a) RF Port Connections and (b) Drive Connections
Table 2 Standard Drive Control
RF path Standard drive voltage
Drive A Drive B
Pin 3 Pin 5
Position A Ground Open
Position B Open Ground
Table 3 TTL Drive Control
RF path Single line TTL/5V CMOS drive
voltage
Dual line TTL/5V CMOS drive
voltage
TTL Drive A TTL Drive B TTL Drive A TTL Drive B
Pin 7 Pin 8 Pin 7 Pin 8
Position A High High High Low
Position B Low High Low High
1
3
5
7
9 2
4
6
8
10
Ribbon Cable
1
3
5
7
9 2
4
6
8
10
Ribbon Cable
PIN #
1
2
3
4
5
6
7
8
9
10
Function
+24 VDC
Ind. Comm.
Drive “A”
Ind. “A”
Drive “B’
Ind. “B”
TTL
TTL Compl.
Comm. Gnd.
Not Used
RF Port 1 is located directly behind
the 10-pin ribbon cable connector.
NOTE:
1
3
5
2
4
6
7
8
9
Solder Terminals
Standard
Option 100
Position A
1 to 2
3 to 4
Position B
2 to 3
1 to 4
(a)
(b)