The most import point needs to be reinforced. DC ground IS NOT RF ground.
A dead short at DC can be like an open circuit at RF. Remember those chokes
keeping RF out of your DC supply in your final amplifiers? DC ground is
great for elimination of static build up, lightning protection and then you
have to analyze the impedance to ground at RF.
Nice discussion.
Bob
Sent from my Verizon Wireless 4GLTE Phone
-----Original message-----
From: Brian Lloyd <[email protected]>
To: Lee Mushel <[email protected]>
Cc: [email protected], Phil Theis <[email protected]>
Sent: Tue, Oct 11, 2011 20:33:17 GMT+00:00
Subject: Re: [FlexEdge] High Power and a 5000A
On Tue, Oct 11, 2011 at 1:47 PM, Lee Mushel <[email protected]> wrote:
You always have to remember that the 5000A has 2,457,281 cables going into
it and all are potential highways for RF. Flex has learned a little about
keeping that stuff out of the box since it was introduced. Mine, one of
the
early ones, for example, did not have the common mode ferrite at the mike
connector. For me that was a 3" dia. pipe for "spurious stuff." You
just
can't have too many of those chokes and while I have not yet bored a hole
in
the basement floor for a salt well ground, proper gounding is difficult to
achieve!
Proper grounding (for RF) is nearly impossible to achieve on all bands using
the same ground. That is why one needs to choke off common-mode RF currents
rather than trying to shunt them to ground.
In fact, I have NO RF ground in the shack. The only ground is at the point
where the coax enters the building, with common mode chokes on both sides.
Works just peachy.
So start thinking in terms of unwanted common-mode RF currents as opposed to
grounding.
--
Brian Lloyd, WB6RQN/J79BPL
3191 Western Dr.
Cameron Park, CA 95682
[email protected]
+1.767.617.1365 (Dominica)
+1.916.877.5067 (USA)
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Flexedge mailing list
[email protected]
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This is the FlexRadio Systems e-mail Reflector called FlexEdge. It is used for
posting topics related to SDR software development and experimentalist who are
using beta versions of the software.
