[SCCC] 160M residential lot antenna

[Bill Haddon]

Tim,

Following on K6ZZ's comments . . .even simpler. . don't short the coax at
the apex; just feed the braid of the coax; of course you will need a
counterpoise . ideally two or more130 foot wires strung around your
property, and your neighbors if they are willing,  as high as you can get
them, preferably 20 feet off the ground, but do the best you can. You may
have to lenghten the coax a bit t get resonance.  While some of the antenna
will be horizontal, that may not be too  bad.  So essentially an inverted L.
NI6T would call it a "perverted Vee"  The center conductor of the coax and
halve the Vee just sit there.

Through Nov of last year, I used my ladder-line 40m DE Zepp that way feeding
one side of the ladder line out of the antenna tuner.. . about 55 foot
vertical and half of a 75 feet horizontal, against a counter poise of about
4 130 wires strung maybe an average of 10 feet off the ground.  In CQWW last
year with 100 watts i worked all continents and accumulated about 41,000
points.

73 Bill n6zfo

On Tue, Feb 1, 2011 at 7:27 PM, Bob Selbrede, K6ZZ <k6zz at ccis.com> wrote:

> Tim,
>
> Try shorting the center conductor to the shield on your 80M
> Inv Vee feedline and tune it with your tuner.  Acts somewhat
> like a vertical with top loading.  I've heard it works
> fairly well although I haven't tried it yet myself.  I'm
> sure it's better than loading up the XM-240.
>
> Another option.  You have plenty of top loading, so a
> shortened 1/4 sloper is also an idea.  Build one or try the
> Alpha Delta DX-A.  It works pretty good if you have plenty
> of top loading and a good ground path down the tower.
> Attach a braided stainless steel strap or similar to your
> mast and to a tower leg above the rotator.  That ensure a
> good connection to the top loading.  Since you are using a
> crankup, you may want to drop a ground line down the side
> (or inside) the tower from the top to the ground system at
> the bottom as well to ensure you have a good path to ground.
>  You could shunt load the tower as well, but to really do it
> right, you would need to run all your feedlines and other
> cables through the inside of the tower which is a pain.
>
> 73, Bob K6ZZ
>
> ----- Original Message Follows -----
> From: "Coker, Timothy J" <TJCoker at lasd.org>
> To: <sccc at contesting.com>
> Subject: [SCCC] 160M residential lot antenna
> Date: Tue, 1 Feb 2011 07:57:34 -0800
>
> > Are there any antenna gurus on the list that wouldn't mind
> > helping me develop a 160m antenna for my place? The last
> > time I asked about 80m I got lots of great ideas and
> > encouragement which led me to build a full size inverted-v
> > , with folded ends. Sometimes it takes me asking a
> > question and getting ideas to do what should have been
> > obvious to me in the first place.
> >
> > I can provide a .pdf copy of my yard and antenna
> > installation, measurements, photos, BBQ dinner, beer,
> > etc...
> >
> > I want to do better than my XM240 2 element yagi for 160m.
> >
> > I have a 55' crank up with C31XR, A3WS, XM240, and 80m
> > inverted-v now. My wife isn't yelling yet about all the
> > aluminum and wire... so I better get something up before
> > she starts to challenge the visual impact...
> >
> > The tower is 4 feet from my house and surrounded by
> > concrete. I do have the ability to run some radials
> > through a 1/4" cut in my concrete to my grass (a 60'
> > north-south x 15' east-west rectangle) 10' to the west of
> > my tower. My backyard / house portion of the property is
> > 75' wide by 75' long (I don't want to push the wife too
> > much by running aerial wires over the front yard).
> >
> > Pictures of the qth are on a link from my QRZ bio.
> >
> > I'm not in a huge hurry, but I have lots of wire, coax,
> > and 50' of fiberglass push up mast that can be used.
> >
> > 73,
> >
> > Tim / N6WIN.
> > _______________________________________________
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