Posted by
Don Wilhelm-3 on
Dec 10, 2004; 3:04pm
URL: http://elecraft.85.s1.nabble.com/Re-Elecraft-Digest-Vol-8-Issue-10-tp372455p372458.html
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
>
>
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