David,
Sorry about the confusion.
I was not proposing that the grounded halfwave was a practical solution - my
intent was only to point out that the behavior of RF on a 'counterpoise
wire' is not magic, but follows the same rules as other wires carrying RF,
just like an antenna element, or one wire of a transmission line. There is
no 'one solution' or one answer to such questions, we have to consider the
behavior of all elements involved.
The REAL answer is: "It all depends ..."
73,
Don W3FPR
----- Original Message -----
On Dec 10, 2004, at 9:27 AM, W3FPR - Don Wilhelm wrote:
One of the 'funny' properties about RF is that it will always find a
(ground) reference somewhere - that may be from any wire, chassis, PC
board or even your body. Whatever the RF finds convenient will be used
as its ground reference.
BTW, a half wavelength wire connected to ground at the far end will
behave just like a quarter wave that is open at the far end - think
transmission line (and antenna wire) behavior.
Doesn't this cause a bit of an RF-philosophical problem? If one end of
the half wave is supposed to determine RF ground, how does the RF know
what's at the other end is also ground? I should think that simply
grounding it to the earth would not do the trick if, as in your original
message, the RF hasn't already "found" it as a convenient ground.
best wishes,
dave belsley, w1euy
_______________________________________________
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com