ORIGINAL MESSAGE: REPLY: If I understand you right, you are talking about a double sided PC board, which of course has a center insulator. We are talking about a solid sheet such as an aluminum chass
ORIGINAL MESSAGE: REPLY: I wondered when someone would bring that up. The answer is that screws are subject to skin effect, just as if they were part of the sheet metal. 73, Bill W6WRT ______________
ORIGINAL MESSAGE: REPLY: Nope. Unless it is insulated from the chassis, a screw is subject to skin effect just as if it were part of the chassis. Having said that however, the skin effect does not st
Having spent the majority of my working years as an instrument tech (before quitting and going back to college) and much of that doing calibration and development of standards I spent a good many hou
Since the aluminum is assumed to be thicker than the RF surface depth on either side its center can be viewed as an insulator at above a certain RF frequency. A double sided PC board with the ends sh
Nope is wrong or it could be right. You havent established any ground rules and are just tossing snippets of criticism _______________________________________________ Amps mailing list Amps@contestin
I agree Roger. Having worked in several screen rooms from National to fairly recent, if a signal got in or out it wasnt a screen room. Some of the rooms were used for the testing of the CIA's Tempes
Yes that's right. You can solder a wire to each side of a sheet of copper and there will be no current passed thru the copper sheet to the wire on the other side. You can even have a solid piece of
And the signal levels, voltage levels, and current levels weren't something you see measured with a normal VOM<:-)) Input (pencil) tubes that we had to wear white gloves to handle and breathing on th
Those doors used a "cam lock" and you could hear the transmitted signal until the cam was almost fully closed on the ramp. The last half inch was like a variable attenuator with absolutely no signal
ORIGINAL MESSAGE: REPLY: If you are talking about RADIATED energy, I agree, no doubt about it. But our discussion is about CONDUCTED energy. So are you telling me that if you mounted a double female
Same thing Bill, radiated energy when intercepted by the screen will put currents into the screen on the side where the energy is and current will flow on that surface. Putting a connector thru the
ORIGINAL MESSAGE: REPLY: Then how does a coax connector pass RF through a chassis? We can agree the center (insulated) conductor is no problem, but how does the grounded shield side pass RF through t
Roger, think about this: Is't your fully shielded amplifier cabinet a miniature version of a screen room? So how does the RF get out of the cabinet? If you look at the coax connector, I think we can
Any time you run an insulated wire thru a chassis wall/plate you have created a coaxial line. Just like when you stick an insulated wire thru the wall of a screen room you get all kinds of coupling.
ORIGINAL MESSAGE: REPLY: Then how about the case where inside the amp, instead of a Pl-259 connector, the builder strips back the insulation, solders a separate wire to the braid and runs that to a g
ORIGINAL MESSAGE: REPLY: Thanks Lane, I agree, but I was just thinking it's about time for someone to jump in and say "enough!". They always do. :-) 73, Bill W6WRT ___________________________________
Yup as long as the connector doesn't go "through" the screen, providing a path not connected to the screen. As I said, it's counter intuitive. 73 Roger (K8RI) ________________________________________
ORIGINAL MESSAGE: REPLY: That's a pretty inventive theory, but I still maintain that RF takes the shortest path. If it can go directly through a chassis at 90 degrees it will, vs taking the long way
Sorry but skin effect rules. It will not let RF pass thru any solid surface. Think of the insulated wire sticking thru the wall of a screen room. In this case it is acting as an antenna coupling ene