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HP 8120-2208 SOURCE
CONTROL CABLE
The HP 8120-2208 Source Control cable is used to connect the HP 8620C Sweep Oscillator to the HP 8410C Network Analyser. The 8410C has an auto-frequency range mode which gives it the capability of automatically tracking the 8620C over octave and multi-octave frequency bands from 110MHz to 18GHz. This cable must be used when sweeping or the 8410C will not phase-lock properly.

HP 8620C Rear Panel Connections
Pin numbering for the Amphenol 'blue' 50 way socket for the Source Control Cable is (as above photo) top row 25 to 1 and bottom row 50 to 26 (left to right).

HP 8410C Rear Panel Connections
Pin numbering for the Amphenol 'blue' 14 way socket for the Source Control Cable is (as above photo) top row 7 to 1 and bottom row 14 to 8 (left to right).

8620C
Socket J2
Function Colour
Code
8410C
Socket J17
 mates to Amphenol 
'blue' 50 way plug
     mates to Amphenol 
 'blue' 14 way plug 
Pin 26 Sequential Sweep
Trigger (RF Blanking)
O/P from 8620C
Yellow (4) Pin 1
Pin 34 Stop Sweep Pulse
O/P from 8410C
Blue (6) Pin 7
Pin 50 HP-IB Data Stobe
Trigger (if HP-IB
option is fitted)
O/P from 8620C
Red (2) Pin 9
Pin 43 Ground 0V Black (0) Pin 11
February 2010

Having tested the 8620C Sweep Oscillator, I have made up the cable (with thanks to Steve K for supplying the connectors).

HP 8410C Rear Panel Connections
I think the Source Control Cable is probably only required when 'Multi-Band' RF Plug-in's are used such as the 86290A/B/C or the 8621A/B with 2 RF Modules fitted. With 'Single-Band' RF Plug-In's such as the 86220, I don't think that the cable will be required. When I get round to testing the HP 8410C Network Analyser this should resolve this issue.