[NLRS] 160 meter vertical

Wed, 12 Nov 2003 18:11:22 -0600

How about a capacitively loaded loop?

----- Original Message ----- 
From: "Clare Jarvis" <[email protected]>
To: "Dave Aho" <[email protected]>; "NLRS" <[email protected]>
Sent: Wednesday, November 12, 2003 12:25 PM
Subject: Re: [NLRS] 160 meter vertical

> Dave,
> 
> I have done quite a bit of modeling on 160M and I don't think you
> can put out much of a signal with a ten foot antenna, no matter how
> you load it.   The other problem is without radials, verticals do not
> radiate, because you only have half an antennae.  
> 
> Clare   K0NY
> 
> 
> 
> 
> 
> 
> On Wednesday 12 November 2003 05:15 am, Dave Aho wrote:
> > I know that this is HF and not NLRS related per se,
> > but If any of you have done any HF work in this area,
> > please let me know and give me some ideas.
> >
> > Well, I have a few thoughts rolling in my head to get
> > done by the 160 meter contest...any hints would be
> > appreciated.
> >
> >   Remember I am in a trailer court...the antenna is to
> > be mounted on a tilt up tower unit on a utility
> > trailer  I really have no way of running a bunch of
> > ground radials out at the base or even a long
> > counterpoise...I might, but I have to worry about the
> > somewhat rare but present little kids running through
> > the yard down here....they don't believe in following
> > the caution tape...they just ignore it all...anyhoo
> > here is my plan as follows:
> >
> >   tower is 2 sections of rohn 20/25...I will have
> > masting pipe on top of that by about 8-10 feet (maybe
> > more)...attached to this masting is going to be the
> > mounting clamp for the antenna (ground side connected
> > to tower).  THe antenna as I visualize it is going to
> > be PL-259 fed at the bottom of a loading coil (3.5 to
> > 4.5 inches diameter of either PVC or Carboard tubing
> > of a to be determined length) to be wound to produce
> > the end result of a 5/8 wave antenna overall length.
> > I am thinking af AWG12 or 14 wire for the
> > windings...does it have to be bare wire, or can it be
> > insulated? On top of the loading coil is going to be a
> > 3/8-24 threaded nut so I can put a 102" whip (either
> > fiberglass which I have a few of, or Stainless which I
> > need to buy...or an equivalent 10/11 meter 1/4 wave or
> > longer mobile whip.)  I could also thread on my 40
> > meter coil/whip for the Valor AB-5 mobile antenna if I
> > wish I suppose, but I am thinking not.  I know this is
> > going to be a marginal antenna...being physically
> > short, but I am making it electrically 5/8 wave...or
> > 1/2 wave if that would work better for multiband
> > work..(as in 80 and 40 meters) as I  notice at least
> > with 2 meter and 10 meter that the gain is
> > considerabley more even with loading coils over the
> > 1/4 wave antennas.
> >
> >    Please let me know...I am trying to be as simple as
> > possible, with no extraneous other coils, matching
> > networks, ground radials and such as it is to be used
> > as a mobile antenna also (under the 13'6" rule) if I
> > wish.  I will also add that I do have a 160 meter
> > capable tuner for the shack also...so the match does
> > not have to be super perfect...and bandwidth is not
> > really an issue as I am used to returning per freq.  I
> > am maybe going to make the prototype this weekend to
> > get on the lower bands for SS, so hopefully you can
> > feed me info by then.  Thanks all.
> >
> >
> >
> > =====
> > 73, and all that jazz,
> >
> >
> >                  Dave...N9TTX
> >
> >
> > Always remember:  "It could be worse.....it could be raining."
> >                              Marty Feldman from "Young Frankenstein"
> >
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