Topband: Horizontal Waller Flag

[David Cole via Topband]

Hi all - I need some help please - I have over the summer been building a 
rotatable HORIZONTAL Waller Flag  (HWF)for 160/80.
The dimensions are 26ft boom and the two loops are 16ft*7ft - I am intending to 
increase the boom to 45 ft with 20ft*10ft as the output on 160 is low - 80m is 
OK.
I have been carrying out experiments with the polar plot by using a medium wave 
AM station located 65 miles away and all during daytime -
The polar plot program I am using is available free and written by Bob G4HFQ 
G4HFQ Radio Programming Software .
I have two main problems - at first, I could not get any directivity at all - 
the problem was not, as far as I know, to do with phasing - or more importantly 
getting all the transformers wired correctly.
Bearing in mind this is horizontally polarised I did not think that an aluminum 
stub mast would have any effect - all I have read and I have read everything I 
can find on the internet - explains that a fiberglass stub mast is a must for 
vertically polarised - that said I replaced my aluminum stub mast with a short 
fiberglass pole..
This solved the problem with good directivity and the polar plot was close to 
that shown in Eznec - (I did model the HWF in Eznec and changing the sub mast 
from aluminum to no stub mast resulted in a slight change to the front to back 
but only a small amount).
I then did some experiments by leaving the fiberglass stub mast holding the HWF 
and put up beside it an aluminum pole first connected to the mast/tower and the 
boom of the HWF and second to the boom and not the tower  - the best results 
were having no connection to the tower - 
Has anyone got an answer on this part of my question - as I would like to use 
an aluminum stub mast which will give me an extra 10ft in height.
My next and final problem - when I have the tower retracted approx 25ft and the 
fiberglass stub mast I have good acceptable directivity - If I then raise the 
tower by 20 feet then the polar plot is and directivity disappears - lower the 
tower back down and the polar plot returns to normal.
I did have a masthead preamp installed I removed this - no difference - I then 
put ferrites around the rotator cable and a common mode choke at the bottom of 
the tower thinking that the coax lead which was originally coiled on the floor 
with the mast down was now acting as a vertical antenna - none of these made 
any difference. my direct email is d...@g3rcq.com

Thanks from Dave g3rcq




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Topband: 160 Receiving antennas

[David Cole via Topband]

160 receiving antennas - very interested to read all the comments - if anyone 
is interested I have a Top Beam WF-300 40 foot boom - just the beam up for 
grabs dave g3rcq
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Topband: G3OQT

[David Cole via Topband]

Richard  G3OQT welcome back  - I heard you last week and thought it was a 
Pirate - where did that 40 years go ?? Dave g3rcq
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Topband: Top Beam WF-300

[David Cole via Topband]

Hi all - I have a WF-300 for sale - d...@g3rcq.com 

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Topband: Top Beam WF-300

[David Cole via Topband]

For Sale Top Beam WF-300 Waller Flag email d...@g3rcq.com 

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Topband: Top Beam WF-300

[David Cole via Topband]

 I have a WF-300 that is surplus to my station Dave g3rcq

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Topband: Short Verticals

[David Cole via Topband]

Hi all - 
Assuming a standard 1/4 wave vertical is 36 ohms - is there any formula that 
will calculate the Z if the vertical is short and brought to resonance by top 
loading wires - I understand the Z will be less - but how much by ? I am trying 
to use the formula on ON4UN disc to calculate the approx LC ratios for a 
Lahlum-Lewallen phasing system.
Thanks Dave g3rcq 
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Re: Topband: Topband Digest, Vol 168, Issue 20

[David Cole via Topband]

Hi all - has anyone compared the SAL-30 to the Yankee Clipper 9 circle array 
Dave g3rcq


  From: "topband-requ...@contesting.com" 
 To: topband@contesting.com 
 Sent: Wednesday, 14 December 2016, 17:00
 Subject: Topband Digest, Vol 168, Issue 20
   
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Today's Topics:

  1. Re: Twist a Flag into a Bowtie? (JC)
  2. Re: Bowtie Flags (Mark Connelly)
  3. Re: Bowtie Flags (Don Kirk)
  4.  Bowtie Flags ( K1FZ-Bruce )
  5. Re: Bowtie Flags (wb6r...@mac.com)
  6. Re: Bowtie Flags (JC)
  7. Re: Bowtie Flags (JC)


--

Message: 1
Date: Tue, 13 Dec 2016 13:51:55 -0500
From: "JC" 
To: "'Nick Hall-Patch'" 
Cc: "'topband'" 
Subject: Re: Topband: Twist a Flag into a Bowtie?
Message-ID: <01d25571$fa8807d0$ef981770$@comcast.net>
Content-Type: text/plain;    charset="us-ascii"

Hi Nick


I would say grounded both ends, don't need to be connected to the antenna
itself, right.

JC

-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Nick
Hall-Patch
Sent: Tuesday, December 13, 2016 11:42 AM
To: JC 
Cc: 'topband' 
Subject: Re: Topband: Twist a Flag into a Bowtie?

So, is the ground wire just left "floating", JC?    No electrical 
connection to the antenna itself?


Thanks and 73,

Nick
VE7DXR


At 11:23 13-12-16, JC wrote:
>Hi Nick
>
>The wire will reduce loss on the transmission line given a better match 
>and phase. In practice you can see change on the SWR and front back. If 
>you have a good ground you probably won't see anything  changing.
>
>Regards
>JC
>
>-Original Message-
>From: Nick Hall-Patch [mailto:n...@ieee.org]
>Sent: Monday, December 12, 2016 10:59 PM
>To: JC 
>Cc: 'topband' 
>Subject: Re: Topband: Twist a Flag into a Bowtie?
>
>What kind of improvement in performance is observed by  providing a 
>better ground, JC?  And, where would a ground wire (counterpoise?) be 
>connected with the DHDL antenna system?
>
>Thanks and 73,
>
>Nick
>VE7DXR
>
>
>
>At 15:38 11-12-16, JC wrote:
> >Hi Mike and Don
> >
> >The DHDL as well as  few other antennas, has a hidden component. The 
> >bottom wire parallel to the ground is a transmission line, actually, 
> >any antenna parallel to the ground is a transmission  line. A 
> >beverage antenna a  is good example.
> >
> >The ground is the second leg of the transition line,  for a K9AY loop 
> >it is the same,  the bottom wire and the ground form a transmission 
> >line. The transmission line allows the Resistor and the Transformer 
> >to be moved to the center of the loop. The VE3DO loop is also exactly 
> >the
>same.
> >
> >The same way, a DHDL antenna uses the ground to phase the two loops, 
> >if you elevate the DHDL high far from the ground, the patter changes. 
> >The DHDL is a ground dependent antenna, improving the ground with a 
> >ground wire bellow the antenna can fix some ground problems.
> >
> >
> >My two cents.
> >
> >73's
> >JC
> >
> >N4IS
> >
> >-Original Message-
> >From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of 
> >Don Kirk
> >Sent: Sunday, December 11, 2016 10:13 AM
> >To: D Michael 
> >Cc: topband 
> >Subject: Re: Topband: Twist a Flag into a Bowtie?
> >
> >Hi Mike,
> >
> >Funny you should ask that.
> >
> >A few months ago (September) I was looking at building a smaller size 
> >DHDL using 4Nec2, and there were a few things I saw that I thought 
> >needed improvement (I saw things in the full size DHDL that I thought 
> >needed improvement, it was not limited to the small size DHDL I was 
> >trying to design).  Then I started to play around with the location 
> >of its termination resistor as well as routing of wires, and wound up 
> >with what I called the Terminated Bowtie.  I built one in my backyard 
> >but my yard is pretty small and the antenna was too close to existing 
> >objects (house and chain link
> >fence) and I did not realize the S/N improvement that I expected, 
> >nevertheless based on modeling it looks like a winner (9.5 RDF and 
> >front to back ratio versus elevation angle very robust).
> >
> >I have attached the preliminary document I put together a few months 
> >ago for you and others to view (it might not be perfect, but should 
> >convey my design / thoughts).  I would love someone to build one of 
> 

Topband: Waller Loop

[David Cole via Topband]

This message is aimed at UK dxers - I commissioned Antenna Engineering to build 
me a Waller Loop - I have used it and its works fine - unfortunately I did not 
use a rotator man enough and it stuck in one position. I have taken it down and 
dismantled it - It would need collecting from my QTH and a car roof rack would 
be adequate - please email me if interested - thanks Dave   Dave g3rcq

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