'Heavy' or 'Light' mineral oil for Cantenna?

[Robert Myers]

Hi all,

Question RE: Best 'Cantenna' (Heathkit HN-31) mineral oil type to use.

I have an HN-31 Cantenna (the original one with the circuitry on top for
measuring relative power).  

I can fill it with so-called 'heavy' mineral oil (more viscous), or
'light' mineral oil (less viscous).  I have both types available.  Both
are easily bought at the pharmacy and elsewhere.

Can someone tell me which would be the better choice of the two?

[Note: I don't want to use transformer oil or anything else -- I just
want to consider these two types of mineral oils for the moment.]

Does anyone have a definitive answer?

Thanks,
-- Rob Myers,
VE3JQL.

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