Hi All I'm looking for any information, hopefully a manual, for what HP labelled as the "8660-K11 10MHz Ref.Gen" which actually looks to be a phase comparator that compares an external 10 MHz signal with an internal HP10811 reference. There are other 8660-K** units, certainly at least the 8660K-10 Phase Modulation Test Set, and I assume they are all either accessories or calibration kit for the 8660 series of signal generators, but can't find anything on them in HP catalogues. My 8660-K10 has been got at, some reworking of the circuit board and at least one non original IC fitted, so a schematic would be very useful if a complete manual isn't available but anything would be appreciated. I am also looking for information on the Tracor 900A VLF receiver/frequency comparator and, again, anything would be gratefully received. regards Nigel GM8PZR
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