-----Original Message----- From: [email protected]
[mailto:[email protected]] On Behalf Of Jim Brown Sent:
Sunday, September 27, 2015 3:49 PM To: [email protected] Subject:
Re: [Elecraft] K3S proper grounding?
> Often the requirements of one system will be at odds with other >
grounding requirements. For instance you generally want a high >
impedance for RFI issues and a very low impedance for lightning >
grounds. One system defeats the other so they really need to be separate
systems. NO, NO, NO, NO!
[Fred Townsend] Well yes maybe. How do you bond a ferrite
choke? Are not all chokes high impedance at their intended
useful frequency? I said 'system' not 'ground'.
[K9YC]
Huh? Chokes are used on SIGNAL lines, NOT on bonding conductors. A
fundamental requirement of bonding is that it be LOW IMPEDANCE, so, in
general, bonding conductors should not be choked. Further, lightning is
NOT a DC event, it is an RF event. It's an impulse, with broad energy
peak around 1 MHz.
73, Jim K9YC
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