----- Original Message -----
From: "Garey Barrell" <[email protected]>
To: "drakelist" <[email protected]>
Sent: Friday, February 04, 2011 1:13 PM
Subject: Re: [Drakelist] L-75 question
I'm still betting on supplied lead length of the original
caps!! :-)
Yes, RF current is likely the reason for the braid, but if
the cap's leads reached there wouldn't be any more of a
current problem.
Yet another wild thought, perhaps the longer cap leads
would have caused an inconvenient series resonance.
Bottom line, it WAS DESIGNED intentionally by some pretty
good engineers, and I would be reluctant to change it
without proving I understood why it was done. It wouldn't
have cost much to add that blank terminal to the switch
wafer, probably less than special ordered caps with longer
leads, but neither would have been done without a good
reason.
(Spoken by an RF engineer who has had to defend more than
one 'crazy design decision'.)
73, Garey - K4OAH
Glen Allen, VA
I'm not at all familiar with this equipment. I wonder
about the lead length to the common point vs: to wherever
the ground ribbon goes. That might be a clue as to whether
the arrangement was done because of limited lead length on
the caps or to reduce inductance. Or, perhaps for some other
reason that isn't obvious but turned up in the prototyping
stage. Drake engineers seem in general to have known what
they were doing.
--
Richard Knoppow
Los Angeles
WB6KBL
[email protected]
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