[Antennas] RE: Loading a 90 foot wire on 160M w/added
inductance
Charles Greene
[email protected]
2002年5月23日 01:36:03 -0400
At 10:07 AM 5/22/2002 -0500, Karl Kanalz wrote:
The best place to put an inductance is at the base of the antenna, in a
water tight container. As long as you are adding inductance, also add a
cap and tune make a L type tuner. As long as you are adding a tuner at the
antenna, put some or all of it in the antenna, or use "linear Loading"
which is about 1/3 of the antenna folded back on itself, top hat loading
and LOTS of ground radials. All of these improve the efficiency of the
system by raising the resistance of the antenna so that you don't have as
much loss in the coax cable and antenna tuner. Every one of these things
helps a little.
I agree with Jim (see his message below), but inductance added
>at the *back* of the tuner, in series with the end-fed wire, will pro-
>duce r.f. radiated *in* the shack. To reduce the chance of that
>happening, you should put the added inductance (which appears
>to be nothing more than a "loading coil") *outside* the shack in
>the feeder wire which feeds your 90-foot wire. Same effect:
>>It makes the antenna "look longer".
>>Karl K - W8TIF
>McKinney, Texas
>>-----Original Message-----
>From: Jim Berry
>Sent: Wednesday, May 22, 2002 9:04 AM
>To: Rob Matherly; Dave Shrader
>Cc: [email protected]
>Subject: RE: [Antennas] Loading a 90 foot wire on 160
>>Hi Guys,
>>Another dirty trick is to add some inductance to your tuner. It can
>be in the form of wire wound in a coil shape, and placed between the
>tuner and the wire.
>>73 Jim K7SLI
73, Chas, W1CG