A10 I/Q Multiplexer J11 Z600 Sel Latch CAL On Latch Ext Out Sellect Ext Out IQ Offset DACs Ext Out IQ Gain Latches EXT I In J7 ABUS I EXT OUT Q EXT OUT J12 ABUS 600 ABUS Cal Source I&Q EXT Q In Ext In IQ Offset DACs Cal IQ DACs J8 Path1 Sel Latches axb a b Path1 IQ Gain Latches Ext Out IQ Fine Adj DACs Sum Sw1 Latches b Sum Sw2 Latches Path2 IQ Gain Latches Fader On To Q PATH 2 IQ Pol Sel Latch b Path2 IQ Fine Adj DACs P1-8 Audio 2 (Q only) ABUS J9 (I) 4 GHz Modulator - IQ To A13 Output From Q 1/64 Sum Sw4 Latches CW Bias IQ DACs Coarse Offset IQ DACs Offset Cancel & Adjust Coarse Fine IQ DACs P1-32 RMS Converters IQ Atten Select Latch axb Path2 Sel Latches Audio 1 (I only) Q EXT OUT J10 (Q) Sum Sw3 Latches a I EXT OUT ABUS 1/64 Path1 IQ Fine Adj DACs J13 J14 axb a P1-20 (I) ABUS IQ RMS Offset Adj DACs PATH 1 P1-46 (Q) Ext Out IQ Bar Offset DACs 1/64 P1-9 (I) P1-34 (Q) 4 GHz Mod Offset Sense - IQ From A13 Output I/Q Inputs J20-50 (Q) J20-22 (I) To A18 Reference P3-5 To A18 Reference P3-2 A7 Baseband Generator A18 Reference 10 MHz Ref A25 Rear Panel Ext Ref Baseband Generator Burst Pulse Out blk_05 A18 Reference Digital Modulation Block Diagram for All Options