Very few mag mounts have an adequate "RF" ground, at least on 11
meters or lower. There isn't enough capacitive coupling to the
vehicle body. In some cases the length of the coax can matter, not
from a matching point of view, but as a counterpoise for the antenna.
I have seen mag mount installations where you could see the SWR change
just by moving the coax around.

Please explain how a poor "RF ground" can be corrected by increasing coax
length??

Don

He never said that a poor RF ground could be corrected by coax length.

He said in effect that the side effects of a poor RF ground could be
reduced by a specific length of coax.

wrote in message
news


Very few mag mounts have an adequate "RF" ground, at least on 11
meters or lower. There isn't enough capacitive coupling to the
vehicle body. In some cases the length of the coax can matter, not
from a matching point of view, but as a counterpoise for the antenna.
I have seen mag mount installations where you could see the SWR change
just by moving the coax around.

Please explain how a poor "RF ground" can be corrected by increasing coax
length??

Don

He never said that a poor RF ground could be corrected by coax length.

He said in effect that the side effects of a poor RF ground could be
reduced by a specific length of coax.

He sure did. He said mag mounts have a poor ground. He said the length of
the coax can help by being "part of the ground plane"(counterpoise). I'm
simply saying you'd need a TON of coax to do that...and get a decent
swr(point of post).

Hence, length of coax(within reason, obviously)on a wilson 1000 mag mount
means diddly squat.

I'm I right, or wrong:-)

Don
313

Hence, length of coax(within reason, obviously)on a wilson 1000 mag mount
means diddly squat.

I'm I right, or wrong:-)

Don
313

I'd bet you're wrong for many installations.The only way to find out
is to take the brand new Wilson 1000 mag mount that you'll purchase to
make your point and cut the coax.. If you are so positive that your
theory is absolute then you should not have any problem cutting the
18' length to the shortest length possible before you ever key up

On Fri, 05 Nov 2004 21:41:17 -0500, wrote:


Hence, length of coax(within reason, obviously)on a wilson 1000 mag mount
means diddly squat.

I'm I right, or wrong:-)

Don
313

I'd bet you're wrong for many installations.The only way to find out
is to take the brand new Wilson 1000 mag mount that you'll purchase to
make your point and cut the coax.. If you are so positive that your
theory is absolute then you should not have any problem cutting the
18' length to the shortest length possible before you ever key up

Or just move his coax around and see if the SWR changes?

The coax on my 1000 is already only 6' long. I can't make it any shorter
:-)

Don
313
wrote in message
...

Hence, length of coax(within reason, obviously)on a wilson 1000 mag mount
means diddly squat.

I'm I right, or wrong:-)

Don
313

I'd bet you're wrong for many installations.The only way to find out
is to take the brand new Wilson 1000 mag mount that you'll purchase to
make your point and cut the coax.. If you are so positive that your
theory is absolute then you should not have any problem cutting the
18' length to the shortest length possible before you ever key up

On Fri, 5 Nov 2004 19:33:30 -0500, "M-Tech"
wrote:


wrote in message
news


Very few mag mounts have an adequate "RF" ground, at least on 11
meters or lower. There isn't enough capacitive coupling to the
vehicle body. In some cases the length of the coax can matter, not
from a matching point of view, but as a counterpoise for the antenna.
I have seen mag mount installations where you could see the SWR change
just by moving the coax around.

Please explain how a poor "RF ground" can be corrected by increasing coax
length??

Don

He never said that a poor RF ground could be corrected by coax length.

He said in effect that the side effects of a poor RF ground could be
reduced by a specific length of coax.

He sure did. He said mag mounts have a poor ground. He said the length of
the coax can help by being "part of the ground plane"(counterpoise). I'm
simply saying you'd need a TON of coax to do that...and get a decent
swr(point of post).

Hence, length of coax(within reason, obviously)on a wilson 1000 mag mount
means diddly squat.

I'm I right, or wrong:-)

Don
313


Don;
No I never said that increasing the coax length of the coax will
fix the problem. I said most mag mounts mounts don't have enough
capacitive coupling to ground to act as adequate ground on their own,
which is true, at least at 27 mhz. The length of coax can be a large
part of the total antenna system.