[Antennas] Common Mode Choke
Dan Richardson
[email protected]
2003年3月09日 16:42:00 -0800
At 05:49 PM 3/9/2003 -0500, Ed wrote:
>OK, I'm confused. I looked at one commercial site and they say to isolate
>the tuner from ground, the other commercial site says to use the tuner for
>the common ground point if you are going to use a common mode choke. Which
>is right and what do you do if you do not use a tuner ?? I need to get RF
>out of the computer, but !!! 73..
>>Ed W3NR
Ed,
The only instance I know of that uses an isolated (floating) tuner is when
the choke/balun is placed on the input side of an unbalanced tuner that in
turn is connected to balance line (ladder line). This is under the mistaken
belief that this reduces the stress on the balun which is does not.
Otherwise you would treat a tuner, like any other of your equipment, ground
it.
In you post above you didn't mention what type of antenna you are using and
how it is fed.
I have found that installing a good common point RF ground system will go a
long ways in reducing RFI in the shack.
73
Danny, K6MHE