In article ,
says...
Can someone please tell me thw specific model numbers of the HP 8505 era
test sets that have directional couplers, etc that are good for HF.

HP 8503A is the 50-ohm S-parameter test set, good for ~40 dB directivity
from near DC to 1 GHz.

HP 8502A is the 50-ohm transmission-reflection test set, with a similar
frequency range.

The 'B' suffix refers to 75-ohm versions of these units.

-- jm

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