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HP 11592-60015 PLUG-IN EXTENDER ASSEMBLY
The HP 11592-60015 Plug-In Extender Assembly is a maintenance aid for the HP 141T Spectrum Analyser System.  It allows the various Plug-In Units: HP 8552B; HP 8553B; HP 8554B; HP 8555A; HP 8556A; to be connected outside the HP 141T Display Section.

Front view showing connectors and resistor
Rear view showing connectors and wiring to resistor
This Extender is part of the HP 08555-60077 Service Kit which I have been looking for as a useful accessory for some time, but I have never seen one on eBay.  These special cables are available from GLK Instruments, plus there is an HP 11592-60016 Inter-Connecting Cable between the RF & IF Sections, both very expensive though!


July 2018

I was given the Extender in exchange for some HP Case parts (thanks Paul).  It needed cleaning-up, some wires resoldered and testing by buzzing out end to end. Although all pin to pin wiring, there is a capacitor and a link in the RF cable and a resistor in the IF cable.  The capacitor is a 470nF Z5U disc ceramic and is across the horizontal deflection circuit.  The link is on the +100V circuit.  The resistor is a 182Ω 50W wirewound as a current limiter on the +100V supply.

The cable ends attached to the metal plate and bracket fit inside the 141T, the RF Section at the top and the IF Section at the bottom.  There is a cut-out in the metal plate to fit the 2 Special D-Type connectors to the external connections, see HP 141T Display Section External Connections.


2 Special D-Type Connecting Cables
These 2 Special D-Type Connecting Cables came from a dismantled HP 141T Display Section.  As the cables are simply routed directly to the Rear Panel of the 141T, a direct connection to the external equipment (AUX A is connected to either the HP 8443A Tracking Generator Counter or the HP 8444A Tracking Generator and AUX B is connected to the HP 8445B Automatic Preselector) could be made instead.


RF Cable Connections
 Pin No   Wire Colour   Wire Number  Notes
1
BL 6  
2 WH/RD 92 Wire Link to Pin 16 
3 WH/RD/YL 924  
4 WH/YL/GN 945  
5 n.c.    
6 VL 7  
7 n.c.    
8
WH/GN/GY 958  
9 RD 2  
10 WH/BK/RD 902  
11 WH/BK/GN 905  
12 WH 9 470nF Capacitor
13 BN 1  
14 n.c.    
15 n.c.    
16 WH/RD/BL 926 Wire Link to Pin 2 
17 n.c.    
18 WH/BK 90  
19 n.c.    
20 n.c.    
21 WH/VL 97  
22 WH/BK/YL 904  
23 WH/BK/BL 906  
24 GN 5 470nF Capacitor
There is an additional WH/RD 92 wire cut-off at both ends. 
IF Cable Connections
 Pin No   Wire Colour   Wire Number  Notes
1
BL 6 182Ω 50W Resistor 
2 n.c.
 182Ω 50W Resistor 
3 WH/RD/YL 924  
4 WH/YL/GN 945  
5 n.c.    
6 VL 7  
7 n.c.    
8
WH/GN/GY 958  
9 RD 2  
10 WH/BK/RD 902  
11 WH/BK/GN 905  
12 WH 9
13 BN 1  
14 n.c.    
15 n.c.    
16 WH/RD/BL 926
17 n.c.    
18 WH/BK 90  
19 n.c.    
20 n.c.    
21 WH/VL 97  
22 WH/BK/YL 904  
23 WH/BK/BL 906  
24 GN 5