The HI-Z was erected quite aways from anything else which involved
bushwhacking and clearing the entire circle, trenching almost 1200 feet of
feedline etc so there was a lot of sweat work done on that project. But
on 160 and 80 where I have the tx antennas to use as a comparison, the
: Topband [mailto:topband-boun...@contesting.com] On Behalf Of David
Raymond
Sent: Thursday, December 18, 2014 1:01 AM
To: Don Moman VE6JY; Topband@Contesting. Com
Subject: Re: Topband: 8 circle: DXE vs Hi-Z
My experience is similar to Don's outlined below. Both gain and noise
figure are important
Bravo, John! Well stated on all points. No disparaging comments noted. I
especially appreciate your discussion of RDF and what it actually means in
practice.
As you commented, in practice, RDF is calculated (EZNEC, etc.) assuming
equal amplitude distribution of noise over all 3D free space.
here.
Lee K7TJR
-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Terry
Posey
Sent: Wednesday, December 17, 2014 7:57 AM
To: 'John Kaufmann'; topband@contesting.com
Subject: Re: Topband: 8 circle: DXE vs Hi-Z
Bravo, John! Well stated on all points
All this discussion about RDF overlooks the issue of
polarization. If you make an array of verticals
with a certain RDF (assuming noise comes from all
directions uniformly), the array will be better than an
individual vertical by the RDF factor. However, what
I have found is that a horizontally
: Wednesday, December 17, 2014 3:19 PM
To: Lee K7TJR; 'Terry Posey'; 'John Kaufmann'; topband@contesting.com
Subject: Re: Topband: 8 circle: DXE vs Hi-Z
All this discussion about RDF overlooks the issue of polarization. If you
make an array of verticals with a certain RDF (assuming noise comes from all
N4IS
JC
-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of John
Kaufmann
Sent: Wednesday, December 17, 2014 8:59 PM
To: topband@contesting.com
Subject: Re: Topband: 8 circle: DXE vs Hi-Z
Good points about polarization. If the signals and/or noise
with
polarization rotation is providing return in new countries for him.
Regards
JC
N4IS
-Original Message-
From: JC [mailto:n...@comcast.net]
Sent: Tuesday, December 16, 2014 1:02 PM
To: 'Tom W8JI'; 'Lee K7TJR'; 'Bob Tabke'; 'topband@contesting.com'
Subject: RE: Topband: 8 circle: DXE vs Hi-Z
Hi guys
Kaufmann
Sent: Wednesday, December 17, 2014 8:59 PM
To: topband@contesting.com
Subject: Re: Topband: 8 circle: DXE vs Hi-Z
Good points about polarization. If the signals and/or noise are polarized
predominantly in one state, then RDF may not be a good predictor of SNR
performance
, December 17, 2014 10:53 PM
Subject: Re: Topband: 8 circle: DXE vs Hi-Z
Well I disagree that gain isn't important. Maybe you topbanders in the
better areas of propagation can afford to throw away many db to get a
better rdf, but that sure isn't the case up here in mid-northern VE6 land.
I have numerous
-
From: David Raymond
Sent: Thursday, December 18, 2014 12:00 AM
To: Don Moman VE6JY ; Topband@Contesting. Com
Subject: Re: Topband: 8 circle: DXE vs Hi-Z
My experience is similar to Don's outlined below. Both gain and noise
figure are important in very low noise environments. In my own case, I
To: 'Tom W8JI' w...@w8ji.com; 'Bob Tabke' b...@onehorsecreek.com;
topband@contesting.com
Sent: Monday, December 15, 2014 11:09 PM
Subject: Re: Topband: 8 circle: DXE vs Hi-Z
The primary difference between DXE and Hi-Z 8 circle arrays is the fact
that
Hi-Z uses ALL 8 verticals actively
Greetings Bob Reflector folks,
Please allow me to provide a bit of my experience since I run both a broad
side/end fire passive 8 vertical array (350 ft diameter) with a DXE
controller AND a HiZ 8 vertical array spaced for 160 meters (220 ft
diameter).
To your specific question about
This thread comes at a good time for me, as I am planning an 8 circle array
as we speak.
My installation will be an 84' diameter circle as I intend to us it on both
160 and 80m. My installation will be in the woods on a rocky hill (New
England glacial moraine). I have found a plateau near the
On Tue,12/16/2014 6:35 AM, Joel Harrison wrote:
Please allow me to provide a bit of my experience since I run both a broad
side/end fire passive 8 vertical array (350 ft diameter) with a DXE
controller AND a HiZ 8 vertical array spaced for 160 meters (220 ft
diameter).
Thanks for a great post,
, December 16, 2014 7:52 AM
To: Lee K7TJR; 'Bob Tabke'; topband@contesting.com
Subject: Re: Topband: 8 circle: DXE vs Hi-Z
Lee,
We probably will just have to disagree about this.
From my viewpoint, the behavior isn't too much different than a big yagi
stack or other antennas we are used to.
The size
!
Lee K7TJR
-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Tom W8JI
Sent: Tuesday, December 16, 2014 4:52 AM
To: Lee K7TJR; 'Bob Tabke'; topband@contesting.com
Subject: Re: Topband: 8 circle: DXE vs Hi-Z
Lee,
We probably will just have to disagree
@contesting.com
Sent: Tuesday, December 16, 2014 9:42 AM
Subject: Re: Topband: 8 circle: DXE vs Hi-Z
Just to correct a typo, my HiZ 8 vertical array is spaced 200 ft, no 220 ft.
Greetings Bob Reflector folks,
Please allow me to provide a bit of my experience since I run both a broad
side
A few comments based on my own experience with various receiving arrays:
Circle diameter of the Hi-Z array:
A circle diameter of 200 feet is specified for the Hi-Z 8-circle array on
160m. In fact, I have found that there is nothing magic about 200 feet.
It happens to be a good compromise
I'm new to 160 and am planning to add an 8-circle. I would like to buy
commercial preamps and the controller. I would greatly appreciate any
advice on the choice of preamp/controller vendor.
I live in a rural area and have a 4-direction 3-ele vertical array for
160 with a 20+ dB f/b. So I'm
- DXE wants a 320' diameter and Hi-Z wants 200' for optimum performance.
It's hard to tell what DXE performance is because it does not disclose
RDF, beam width or F/B. And neither vendor supplies EZNEC files so I can
see the effect of varying the layout. So I'm not sure how to decide what
.
All 8 element arrays do NOT work the same way.
Lee K7TJR
-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Tom W8JI
Sent: Monday, December 15, 2014 7:24 PM
To: Bob Tabke; topband@contesting.com
Subject: Re: Topband: 8 circle: DXE vs Hi-Z
- DXE
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