On 10/6/97 11:27 AM, Tom Osborne at w7why@mail.coos.or.us wrote:
>Hi guys. Thanks for all the replies to my questions about the tuned
>feeders. Now another one. The antenna I put up is a 130 foot dipole fed
>with twin lead. It works great on the WARC bands and 10 meters. I tried
>to use it this weekend on 10 meters, but the noise from my computer is
>awful! The tuner is pretty close to the computer.
Is the tuner in a sheilded box?
>If I ran the twin
>lead to the entry point of the shack, then used a couple of pieces of
>coax (grounding the shield) for the run to the tuner, would that work to
>keep the noise out of the computer? I'd just go ahead and try it, but I
>don't have any extra coax laying around. Thanks
It might help. But if the tuner isn't sheilded, probably not much.
You might consider what I do, with a very similar antenna. I run coax
from the tuner to the outside of the house, then switch to ladder line
using a balun. I use a 1:1 balun, but a 4:1 should work as well.
Make sure you use good quality solid-dielectric coax in this service.
RG-8 or RG-213. Remember that the coax is in the path of a conjugate
match and there may be signifcant capacitive or inductive reactances
present along the length of it. The last thing you want is a voltage
breakdown of the dielectric.
Be sure your balun is also setup to avoid voltage breakdowns. And keep
the coax run as short as possible.
Bill Coleman, AA4LR, PP-ASEL Mail: aa4lr@radio.org
Quote: "Not in a thousand years will man ever fly!"
-- Wilbur Wright, 1901
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