Model-FC-347 Model-FC-390 CRT/Super Star KF VI Frequency Counter (EPT210014D)

Model-FC-347 Model-FC-390 CRT/Super Star KF VI Frequency Counter (EPT210014D)
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Just an observation while I was down a rabbit hole on something else.

Anyone else looking for hookup details for these or the same counter with the C rev board search using this link> What Dont you know about these counters?

Anyway many moons ago I tried and failed to hook one of these Rev D boards (EPT210014D) to a President Adams uPD858 7.8MHz. Lots of help from a busy community back then, but no joy.

Tried both pads JP1 & JP2
Tried 30pF and higher on the VCO tap.
Indeed tried a…

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Author: iz4wnp