Topband: ZS6BKW

[Marsh Stewart]

I'm sure interested in your PP presentation.

I know a highly competitive CW and RTTY contester who uses a W8AMZ 160M
Reduced 1/2 Sloper and a Shielded Magnetic Receive-Only Loop Antenna and
does much better on 160M than might be expected.

73,
Marsh, KA5M

marsh at ka5m.net



-----Original Message-----
From: Topband [mailto:topband-bounces at contesting.com] On Behalf Of James
Rodenkirch
Sent: Saturday, March 28, 2015 4:47 PM
To: 'Mike Smith VE9AA'; Top Band Contesting
Subject: Re: Topband: ZS6BKW

That W8AMZ sloper is a "condensed version" of this antenna:
 
http://www.iw5edi.com/ham-radio/?a-160-meter-antenna-for-small-lot,105
 
W8AMZ's loading coil (that black thingy between the SO-239 and the 68' feet
of black wire) is sort of how I constructed my "160 meter antenna for a
small lot."  I wound the 70' vertical coil into a condensed 4.5 feet of coil
at the top of the 8' PVC.....used about five or six 50' to 70' radials lying
on top of the ground....had 180+ QSOs in the 2010 and 2011 CQ 160 contests
as a QRP entry including JAs and KHs 
 
Best of luck, Mike....I have a Power Point wiring schema for my antenna if
interested....72, Jim Rodenkirch K9JWV 

 
> From: marsh at ka5m.net
> To: ve9aa at nbnet.nb.ca; topband at contesting.com
> Date: Sat, 28 Mar 2015 15:58:21 -0500
> Subject: Re: Topband: ZS6BKW
> 
> Mike,
> 
> I found a website with detailed info on the ZS6BKW antenna.
> 
> http://www.nc4fb.org/wordpress/zs6bkw-multi-band-antenna/
> 
> To use the antenna on 80M and above the 39.1 ft of ladderline should drop
> down as vertically as possible, and then connect to 50 ohm coax through a
> "1:1 current balun" (common mode choke). If you connect the station end of
> the coax shield to center conductor and feed it against a radial system
the
> coax will be part of the "vertical element" of what has become a 160M top
> loaded vertical fed against a radial system. How will the coax in your
> installation run from the station to the base of the ladderline? 
> 
> Or, if you have a 40 - 45 ft high support (tree) you might consider a
W8AMZ
> 160M Reduced 1/2 Sloper.
> 
> http://w8amz.com/W8AMZ_SLOPERS_Page.html
> 
> If you do try the ZS6BKW antenna reconfigured as a top loaded vertical on
> 160M by connecting the station end of the coax shield to center conductor
> fed against a radial system, I'd like to know how it works for you.
> 
> 73,
> Marsh, KA5M 
> 
> 
> 
> -----Original Message-----
> From: Topband [mailto:topband-bounces at contesting.com] On Behalf Of Mike
> Smith VE9AA
> Sent: Saturday, March 28, 2015 1:44 PM
> To: topband at contesting.com
> Subject: Topband: ZS6BKW
> 
> Thanks very much Marsh.  Obviously you have some serious antenna modeling
> skills and I do thank you for that second analysis.
> 
> If I may indulge you for one last request (tweak) pse?
> 
> If you could keep everything the same, but instead, leave the ladder line
as
> is and short the 50' of coax at the shack end (and add a normal 10' jumper
> to the radio if it makes a difference?) would that make the #'s much
> different?
> 
> Ground radials attached to the real 10' jumper /shorted coax interface,
> right at the window. I think in actuality I am going to buy LM240 (is that
> that right moniker for a RG8/x mini equivalent?) so I can sneak it out a
> window, etc.
> 
> and if I was able to make the switch-over in the shack (or right at the
> window-ledge) then that would be the way I go.
> 
> Thanks for the extra work.  Hope we manage a QSO !
> 
> Mike VE9AA & ??#??? this summer.
> 
> p.s.-can't wait for snowmelt as I can start building and testing !
> 
> Mike, Coreen & Corey
> 
> Keswick Ridge, NB
> 
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