Wouldn’t that be proven to some extent at least, by the RF burns many of us
have received from metal microphones connected to ungrounded transmitters?
Chuck W5PR
On Sat, Sep 27, 2025 at 12:34 PM Brian Beezley <k6sti@att.net> wrote:
> "Except that "ground" isn't actually some sort of sink for RF. Imagine a
> portable battery operated setup with a dipole antenna and nothing about
> the rig connected to ground. A common mode choke will do its job ... a
> connection from the coax shield to ground doesn't do a thing."
>
>
> Dave, I believe grounding a coax shield often can keep unwanted shield
> current from reaching a rig, whether the rig is grounded or not. So will
> a series shield impedance in the form of a choke.
>
> I've always thought of ground as a current sink. A good RF ground
> exhibits low impedance, a poor one higher impedance. This does not
> extend to "grounds" away from the surface of the earth. "Grounding"
> something up on a tower may be effective at DC but not at RF.
>
> I can't give a reasoned explanation for my thinking this way. Because
> it's pretty fundamental, I'm open to, and invite, counterarguments. I'd
> be happy to learn that I'm overlooking something. The only problem is my
> current lack of time to participate in an extended discussion. Too many
> pressing projects!
>
> Brian
>
> _______________________________________________
>
>
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk@contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
>
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|