Anritsu VectorStar ME7838 Series, Maintenance Manual, Page: 66 / 178

4-4 Functional Description of System Components Theory Of Operation
4-6 PN: 10410-00306 Rev. F VectorStar ME7838 Series MM
3739B Broadband Test Set
The 3739B Broadband Test Set performs the following tasks:
• Decoding the control logic sent from the MS464xA or MS464xB VNA
• Switching the RF signal between Port 1 and Port 2
• Leveling control of LO signals
• Amplifying RF and LO signals
• Multiplexing various level detector signals to MS464xA or MS464xB VNA
• Providing DC power for both Millimeter-Wave Modules
• Passing IF signals from Millimeter-Wave Modules to MS464xA or MS464xB VNA
Figure 4-4 shows the block diagram of the 3739B Test Set.
Both Port 1 and Port 2 LO Out ports have typical power output at 5 to 10 GHz of +6 dBm in Modular/BB mode
(used when Anritsu 3743/3744 series or MA25300A series modules are installed) and at 8 to 22 GHz of
+17 dBm in mmW mode (used when OML/VDI Millimeter-Wave modules are installed). When used with the
MA25400A modules, the LO range is 5 to 19 GHz with a minimum output power of +10 dBm.
Both Port 1 and Port 2 RF Out ports have minimum power output at 26 to 40 GHz of +5 dBm in Modular/BB
mode and at 8 to 22 GHz of +16 dBm in mmW mode.
Figure 4-4. 3739B Test Set Block Diagram
Control PCB
Power
Supply
a1 IF
Out
b1 IF
Out
a2 IF
Out
b2 IF
Out
External I/O
To VNA
Ext ALC
From VNA
Ext Analog Out
RF
In
Port 1
LO
Out
Port 1
RF
Out
LO1
In
Port 1
IF In
Port 2
RF
Out
Port 2
LO
Out
LO2
In
Port 2
IF In
Port 2
Pwr &
Ctrl
Port 1
Pwr &
Ctrl
Port 2 Pwr & Ctrl Port 1 Pwr & Ctrl
LO Pwr Ctrl
LO Pwr Ctrl LO Pwr Ctrl
Lvl Det Lvl Det
IF Lvl Det
Doubler Module Doubler
Module
mmW LO Lvl Det
mmW LO Lvl Det
mmW LO Lvl Det