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HP 8411A HARMONIC FREQUENCY CONVERTER
 


 
 

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For use with HP 8410C Network Analyser, reference and test channel inputs.  Covers 110MHz to 12.4GHz, or with Option 018 110MHz to 18GHz, both using special APC-7 connectors.  Cost new $3,850 in 1980.  HP Manual downloaded from the Web, (with 8410B).
 
 
 
 
Front view
 
 
 
Rear view showing special connectors
 
 
 
Note the special 9 Pin Socket connection to the 8410C, a very rare connector.  Also the 8411A uses the APC-7 hermaphrodite connector to interface to the reference and test channel inputs.  Apparently these inputs are very sensitive to static, so 'ground' cables before connecting them.  50mW +17dBm is the input power damage level, or more than ±3V will take out the Step Recovery Diodes (SRD) which are irreplaceable.  This is the only item of equipment that I have that uses these connectors so APC-7 to N-type adaptors are essential.
 
 
 
March 2007
 
Bought the 8411A Option 018 (S/N 2004A) on eBay FR together with a 8410C & 8414A.
 
 
 
March 2009
 
Bought a 2nd unit Option 018 (S/N 2004A) on eBay UK.