______long 30' 6m yagis 48/64'
|
|
___|___ ^
||| 48' / TEE \ (tophat wires @ 45º) Top @ 55' hung in a
tree.
||| / | \
||| / | \
||| / | \
/ |||24'\ <A-D,DX-A twin sloper
/ ||| \ |
/ ||| \ /
||| \ /
||| / \
|||((coil))_ / \
-----------------------------------24 radials, only connected to TEE
antenna, 60-130' long (varies). The vertical portion is around 60º vertical
(ie: slightly more upright than 45º) TEE vertical matched with a 5-10uH
coil for near perfect SWR 1800-1860 2.1:1 resonant on 1823kcs
Hard to draw a 3-D diagram in ASCII.....the T and the sloper are around 20'
apart and don't really "cross" like in the diagram.
The sloper actually stretches out much farther than my ASCII art shows. It's
nearly horizontal !
For tonight. I have unhooked the A-D DX-A and shorted the coax's PL-259
together.
I am running just the T vertical 55' up, and 55' per side on the 2 sloping
tophat wires @ 45º down towards the ground.
EU's been audible for an hour and a half before SS. . . .
Mike ve9aa
Mike, Coreen & Corey Smith
699 Rte 616 Keswick Ridge
NB
Canada
E6L 1T1
----- Original Message -----
From: Joe Subich, W4TV
To: 'Mike & Coreen Smith'
Sent: Saturday, November 07, 2009 4:22 PM
Subject: RE: Topband: Low Alpha Delta DX-A twin sloper BEST antenna
here -howcan that be? A TEST
Mike,
> sEE MY COMMENTS BELOW
> Where is your T bottom with respect to the tower,
>
> INCHES AWAY FROM BASE OF TOWER.
The T (vertical) is very heavily coupled to the tower and
sloper if they are that close - particularly if the sloper
is shorted to the tower when not used. The sloper/tower
is effectively a vertical on its side (sloper is the
vertical, the tower is the "ground"). The two antennas
are so closely coupled that you could even consider them
a single antenna.
> how many and kind of radials do you have below the T,
> A COUPLE DOZEN 1/8->1/4 WL RADIALS
>
> is there a direct connection to the tower, and does the
> tower base have radials?
>
> BASE OF TOWER SUNK INTO HUGE BLOCK OF CONCRETE. NOT
> GROUNDED TO RADIAL SYSTEM.
You would be far better to attach wires (one = "L", two =
"T") to the top of your mast (or attach them just below
the top yagi) and shunt feed the tower. Connect the
radials to the base of the tower and add as many more
as you can.
73,
... Joe, W4TV
>
> Guy.
>
>
> On Sat, Nov 7, 2009 at 11:30 AM, Mike & Coreen Smith
> <ve9aa@nbnet.nb.ca>
> wrote:
>
> OK, on a lark, I am going to try something. I just
> unhooked my A-D twin
> drooper, err, I mean sloper from the
> switchbox, then took a chunk of wire and shorted it out @
> the PL-259 end
> at
> the base of the tower.
>
> The SWR on my T-vertical changed dramatically. (for the
> better). There
> must
> have been a lot of interaction, either through the
> switchbox itself, or
> just
> proximity??
>
> I'll leave it unhooked for a day or two and see how I
> make out with no
> reference antenna at all.
>
> I'll be the 30/S9 signal on the band tonight.......(hee hee)
>
> Thanks for all the emails. If this fails or produces
> mixed results, I
> may
> modify the antenna swaitch back to original if I can
> remember what I did
> to
> begin with(?) or put a new remote switch in
> there........or do as a
> couple
> suggested and mount an inverted VEE up near the top of my
> tower (44'),
> however that's really a last resort....I don't want a
> cloud burner.
>
> Another option I guess , is to lay out 100 more radials.
> Do-able, but
> wouldn't look forward to it ;-)
>
> Mike VE9AA
>
> Mike, Coreen & Corey Smith
> 699 Rte 616 Keswick Ridge
> NB
> Canada
> E6L 1T1
> ----- Original Message -----
> From: Kenneth D. Grimm, K4XL
> To: Wes Attaway (N5WA)
> Cc: 'Mike & Coreen Smith' ; topband@contesting.com
> Sent: Saturday, November 07, 2009 11:49 AM
> Subject: Re: Topband: Low Alpha Delta DX-A twin sloper
> BEST antenna
> here -
> howcan that be?
>
>
> Mike,
>
> The procedure described by Wes below is exactly the
> approach I would
> take. If you do this, I'm betting that you are left
> with #1 below,
> since you said you previously had your antennas over
> "soggy ground."
> Rocky and soggy are significantly different.
> Good luck with your gremlin chasing.
>
> 73,
> Ken - K4XL
>
> Wes Attaway (N5WA) wrote:
> > Mike:
> >
> > 1. Maybe the type of rocky ground is the reason.
> > 2. Take down all the other wires and check the L (or
> T) by itself,
> still
> > using switchbox.
> > 3. Take out the switchbox and just feed the antenna
> directly (still
> by
> > itself, no other wires)
> > 4. If things are still bad then the problem probably
> has something to
> do
> > with your location.
> >
> >
> > ------------------ Wes Attaway (N5WA) ------------------
> > 1138 Waters Edge Circle - Shreveport, LA 71106
> > 318-797-4972 (office) - 318-393-3289 (cell)
> > Computer Consulting and Forensics
> > -------------- EnCase Certified Examiner ---------------
> >
> >
> > -----Original Message-----
> > From: topband-bounces@contesting.com
> [mailto:topband-bounces@contesting.com]
> > On Behalf Of Mike & Coreen Smith
> > Sent: Saturday, November 07, 2009 6:44 AM
> > To: topband@contesting.com
> > Subject: Topband: Low Alpha Delta DX-A twin sloper
> BEST antenna
> here -
> > howcan that be?
> >
> > Sorry for the long and rambling post. . . .
> >
> > OK gang, I know antennas "fairly" well, but this has me
> stumped...really
> > REALLY stumped. I've beat myself up over this for 2
> yrs. straight. I
> just
> > can't get it. I am (almost) ready to rip everything
> down and start
> from
> > scratch)
> >
> > I posed a ~similar~ question last year and have tried
> some different
> things,
> >
> > but I'm losing my patience with the wire here (hi)
> >
> > BACKGROUND:
> > At my old QTH, I ran an inverted L...5/16thWL and fed
> with a 800pF
> cap
> in
> > series. A dozen to two dozen 1/4wl radials(depending
> on how many got
> broken
> >
> > in the summer)over soggy ground. It meandered up
> 50-ish or so feet
> with
> the
> >
> > remaining 117' up/down/over/under trees --even the tip
> sloped back
> towards
> > the ground 20' or more.....and it ROCKED....I mean, I
> wasn't any
> VE1ZZ
> or
> > anything but I felt I was upper middle crust of the
> W1/VE1 pileup. I
> also
> > had the exact same tower and exact same Alpha Delta
> DX-A twin sloper
> up
> (for
> >
> > reference) and it s*cked...really bad. Easily several
> S units below
> > anything else on 40-80-160m
> >
> > NOWADAYS:
> > Fast forward to new QTH...same 48' DElhi self
> supporting tower set in
> > concrete....same 2 long 6m yagis on tower
> (48/64')....same lil'
> sloper
> > mounted @ 24' off side of tower....
> > I have tried 2 iterations of a plain inverted
> L.....currently it's a
> "T"
> > antenna. Sloping 55' or so up and 2 T's @ 55' or so
> each sloping @
> aprox
> 45º
> >
> > to the ground....loads nicely with a few uH @ the base. Seems
> quieter
> than
> > the A-D twin.
> > I have tried shunt -and- series feeding my 48' tower
> (no problem to
> do).
> > They have all loaded well and I got a good SWR match
> with a usually
> narrow
> > window 50Kcs maybe of 2.1:1 SWR of which to operate
> in. I have 25 or
> so
> > 1/8wl to 1/4wl radials - 1" below the grass. Ground
> is rocky shale?
> sort of
> >
> > stuff. My QTH is on a nice high ridge and I do quite
> well on VHF and
> other
> > HF bands.
> >
> > My signal is pitiful on **all** the 160m antennas I've
> tried....with
> the
> > exception of the 1/4WL Dx-A twin sloper @ 24' !!!
> (it's best but it
> barely
> > works)
> >
> > The little/low twin sloper off the side of the towe is
> ALWAYS the
> loudest on
> >
> > the band....by usually 6dB or more........I know this
> can't be right.
> >
> > How can this be? I am using a 4-1 antenna switchbox
> (Ameritron I
> think)
> @
> > the base of the tower which the antennas all share.
> Many years back
> I
> > modified it so all antennas "floated" (instead of
> being grounded)
> when
> not
> > selected as I was using this as a K8UR sloper system
> switchbox at one
> time.
> > I am pretty sure (but not 100%) that I even ran a
> separate chunk of
> coax
> > right out to an inverted L last fall in desperation.
> I do lots of
> antenna
> > experimenting, so it's sometimes hard to remember the
> 45th iteration
> of
> a
> > trial I had a couple years ago, hi.
> >
> > I *DO* notice significant SWR curve changes on the
> lil' wee sloper if
> I
> make
> >
> > any mods to any of the other "REAL" 160m antennas.
> >
> > I either have interactions in the switchbox, or
> proximity between
> antennas
> > or something that I am totally missing. All 160m
> antennas are quite
> close
> > (less than 20-30' away).
> >
> > Logic tells me there is no way in heck the very low
> Alpha-Delta DX-A
> twin
> > sloper can __always__ be the best antenna to transmit
> and receive on.
> YET
> > is is !!? From what I see on the cluster, web and
> hear on the air, I
> can
> > hear quite well, but DX stations normally have to be
> 559-579 before I
> even
> > get a QRZ.....I am currently running ~750W.........
> >
> > I'm cracking up.....too much listening to
> QRN.......sorry for the
> long
> post.
> >
> > Thanks for any insight. I am ready to put a Webster
> Bandspanner on
> my
> > mobile and go sit out in the yard and DX.
> > <hi>
> >
> > VE9AA Mike
> >
> > Mike, Coreen & Corey Smith
> > 699 Rte 616 Keswick Ridge
> > NB
> > Canada
> > E6L 1T1
> > _______________________________________________
> > 160 meters is a serious band, it should be treated
> with respect. -
> TF4M
> >
> > _______________________________________________
> > 160 meters is a serious band, it should be treated
> with respect. -
> TF4M
> >
> --------------------------------------------------------------
> ----------
> >
> >
> > No virus found in this incoming message.
> > Checked by AVG - www.avg.com
> > Version: 9.0.698 / Virus Database: 270.14.53/2486 -
> Release Date:
> 11/07/09 02:38:00
> >
> >
>
>
> --
> Ken K4XL
> k4xl@arrl.net
>
> *** BoatAnchor Manual Archive ***
> On the web at http://bama.sbc.edu and http://bama.edebris.com
> FTP site info: bama.sbc.edu login: anonymous p/w: youremailadr
>
> _______________________________________________
> 160 meters is a serious band, it should be treated with
> respect. - TF4M
>
>
>
> --------------------------------------------------------------
> ----------------
>
>
>
> No virus found in this incoming message.
> Checked by AVG - www.avg.com
> Version: 8.5.425 / Virus Database: 270.14.52/2485 -
> Release Date:
> 11/06/09
> 19:39:00
> _______________________________________________
> 160 meters is a serious band, it should be treated with
> respect. - TF4M
>
>
>
>
>
> --------------------------------------------------------------
> ----------------
>
>
>
> No virus found in this incoming message.
> Checked by AVG - www.avg.com
> Version: 8.5.425 / Virus Database: 270.14.52/2485 - Release
> Date: 11/06/09
> 19:39:00
> _______________________________________________
> 160 meters is a serious band, it should be treated with
> respect. - TF4M
------------------------------------------------------------------------------
No virus found in this incoming message.
Checked by AVG - www.avg.com
Version: 8.5.425 / Virus Database: 270.14.52/2485 - Release Date: 11/06/09
19:39:00
_______________________________________________
160 meters is a serious band, it should be treated with respect. - TF4M
|