Topband: Topband Digest, Vol 93, Issue 9
K3vw at aol.com
K3vw at aol.com
Fri Sep 10 12:29:10 PDT 2010
I, K3VW, then, WB3GCG of Brandywine, Md. had a pair of phased delta loops
on two 150' towers, back in the 70's & 80's. A wire yagi would have taken up
more space then I had available at the time. My Delta loop system worked
quite well. Willy Worth K3VW Selma, NC
In a message dated 9/10/2010 3:01:13 P.M. Eastern Daylight Time,
topband-request at contesting.com writes:
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Today's Topics:
1. 160 wire yagi (Craig Clark)
2. Re: 160 wire yagi (lars.harlin at one.se)
3. Re: 160 wire yagi (Pete Parisetti)
4. Re: 160 wire yagi (Mirko S57AD)
5. 9M2AX (David Raymond)
6. Twinax (Larry Pasman)
7. Re: 160 wire yagi (Mauri)
8. Re: 160 wire yagi (Jorge Diez - CX6VM)
----------------------------------------------------------------------
Message: 1
Date: Thu, 9 Sep 2010 15:18:05 -0400
From: "Craig Clark" <jcclark at myfairpoint.net>
Subject: Topband: 160 wire yagi
To: <topband at contesting.com>
Message-ID: <006f01cb5053$bc5b7890$351269b0$@net>
Content-Type: text/plain; charset="us-ascii"
Message: 1
Date: Wed, 8 Sep 2010 13:54:53 -0300
From: "Jorge Diez - CX6VM" <cx6vm.jorge at adinet.com.uy>
Subject: Topband: 160 wire yagi
To: <topband at contesting.com>
Message-ID: <004601cb4f76$8f260580$ad721080$@jorge at adinet.com.uy>
Content-Type: text/plain; charset="us-ascii"
Hello,
Anyone tried a 160 mts wire yagi?
Will appreciate some info about the performance and construction.
I have a 120 ft tower and some big trees far apart, my idea is to do the
wire yagi from the tower to the tree. The heights are not the same, will
have a rope from from 120 ft high in the tower to 55 ft high in the tree
where I will hang the elements, sloping to the ground.
I have a tree in front of the tower and in the back, so I can do the yagi
with the reflector lower than the driven element and the director, or
viceversa, wich one is better?
73,
Jorge
CX6VM/CW5W
Jorge
If my mind had not completely addled, Denny Had, K8KXK, from Dentron build
a
two element bi-directional 160 beam and published it but I cannot find a
reference to it on Google. I'll look later to see if it is in one of my
antenna files.
Craig
Craig Clark K1QX
Radioware
PO Box 209
Rindge NH 03461
603 899 6957
www.radio-ware.com
------------------------------
Message: 2
Date: Fri, 10 Sep 2010 08:22:35 +0200
From: lars.harlin at one.se
Subject: Re: Topband: 160 wire yagi
To: "Craig Clark" <jcclark at myfairpoint.net>
Cc: topband at contesting.com
Message-ID:
<a1b61a243c39651035503cbf08b57394.squirrel at webmail.bahnhof.se>
Content-Type: text/plain;charset=utf-8
> Message: 1
> Date: Wed, 8 Sep 2010 13:54:53 -0300
> From: "Jorge Diez - CX6VM" <cx6vm.jorge at adinet.com.uy>
> Subject: Topband: 160 wire yagi
> Hello,
>
> Anyone tried a 160 mts wire yagi?
>
My suggestion is that you use your energy to build phased verticals
instead. Probably a much better choise, as the height 120' - 55' is much
to low to get a Yagi for 160m to perform. It will become a "cloud heater"
with high ground losses.
73 de Lars/SM3BDZ
------------------------------
Message: 3
Date: Fri, 10 Sep 2010 09:49:04 +0200
From: Pete Parisetti <hb9dsu at gmail.com>
Subject: Re: Topband: 160 wire yagi
To: Craig Clark <jcclark at myfairpoint.net>
Cc: topband at contesting.com
Message-ID:
<AANLkTik2wQsPrhhsqb6uQXfgOk6gDxCX8-VH3jOypCc+ at mail.gmail.com>
Content-Type: text/plain; charset=ISO-8859-1
Top contest station IR4T in Modena, Italy, has a two element wire beam
suspended from a water tower at 210'. Performance, as I remember from 15
years ago, was astounding - once we managed to break the US pileup on
4U1UN...
The design was the work of Maurizio, I4JMY, who I believe reads this list.
You may want to contact him directly for more information.
73/DX
Pete
On Thu, Sep 9, 2010 at 9:18 PM, Craig Clark <jcclark at myfairpoint.net>
wrote:
> Message: 1
> Date: Wed, 8 Sep 2010 13:54:53 -0300
> From: "Jorge Diez - CX6VM" <cx6vm.jorge at adinet.com.uy>
> Subject: Topband: 160 wire yagi
> To: <topband at contesting.com>
> Message-ID: <004601cb4f76$8f260580$ad721080$@jorge at adinet.com.uy>
> Content-Type: text/plain; charset="us-ascii"
>
> Hello,
>
> Anyone tried a 160 mts wire yagi?
>
> Will appreciate some info about the performance and construction.
>
> I have a 120 ft tower and some big trees far apart, my idea is to do the
> wire yagi from the tower to the tree. The heights are not the same, will
> have a rope from from 120 ft high in the tower to 55 ft high in the tree
> where I will hang the elements, sloping to the ground.
>
> I have a tree in front of the tower and in the back, so I can do the yagi
> with the reflector lower than the driven element and the director, or
> viceversa, wich one is better?
>
> 73,
>
> Jorge
>
> CX6VM/CW5W
>
>
> Jorge
>
> If my mind had not completely addled, Denny Had, K8KXK, from Dentron
build
> a
> two element bi-directional 160 beam and published it but I cannot find a
> reference to it on Google. I'll look later to see if it is in one of my
> antenna files.
>
> Craig
>
>
> Craig Clark K1QX
> Radioware
> PO Box 209
> Rindge NH 03461
> 603 899 6957
> www.radio-ware.com
>
>
>
>
> _______________________________________________
> UR RST IS ... ... ..9 QSB QSB - hw? BK
>
--
___________________________
Pete Parisetti MM0TWX - HB9DSU
for music, ham radio and more
visit http://www.hb9dsu.com
------------------------------
Message: 4
Date: Fri, 10 Sep 2010 12:35:40 +0200
From: Mirko S57AD <miroslav.sibilja at amis.net>
Subject: Re: Topband: 160 wire yagi
To: topband at contesting.com
Message-ID: <4C8A09FC.5050203 at amis.net>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Hi Jorge,
some 20 years ago at YU1EXY, we spread sloping dipole and reflector (30m
apart) from 60m tall building to SW (at 45? angle), which created sloped
(semi vertical) yagi toward NW and which performed excellently. At
opposite side of building we had 3 el wire yagi for 80, made in same
fashion.
As far as I can recall, guys from Bologna (Italy) used 2 el inv V wire
yagi (switchalbe) at their "fungi" (water tower) shack, which also
preformed excellently.
IMHO, you need very tall supports for wire yagis, so IMHO it would be
better to build either wire 4-square or maybe sloping dipole array.
K3LR array would be excellent solution as well...
73 Mirko, S57AD
Na 9/8/2010 6:54 PM, Jorge Diez - CX6VM je pisal:
> Hello,
>
>
>
> Anyone tried a 160 mts wire yagi?
>
>
>
> Will appreciate some info about the performance and construction.
>
>
>
> I have a 120 ft tower and some big trees far apart, my idea is to do the
> wire yagi from the tower to the tree. The heights are not the same, will
> have a rope from from 120 ft high in the tower to 55 ft high in the tree
> where I will hang the elements, sloping to the ground.
>
>
>
> I have a tree in front of the tower and in the back, so I can do the yagi
> with the reflector lower than the driven element and the director, or
> viceversa, wich one is better?
>
>
>
> 73,
>
> Jorge
>
> CX6VM/CW5W
>
> _______________________________________________
> UR RST IS ... ... ..9 QSB QSB - hw? BK
>
>
------------------------------
Message: 5
Date: Fri, 10 Sep 2010 07:05:25 -0500
From: "David Raymond" <daraymond at iowatelecom.net>
Subject: Topband: 9M2AX
To: "TopBand" <topband at contesting.com>
Message-ID: <17296AE4C8604A11AF4F1FEBA8D406F5 at radiocomputer>
Content-Type: text/plain; charset="iso-8859-1"
Ross, 9M2AX, was QRV this morning CQing on 1832.5 (NA time - between 1130z
and 1200z). He was just copyable here (339) at SR and a few minutes
after. The Fall and Spring equinoxes have been the optimum time to work him
from NA.
73. . .Dave
W0FLS
------------------------------
Message: 6
Date: Fri, 10 Sep 2010 08:23:04 -0400
From: "Larry Pasman" <lrpmbt at comcast.net>
Subject: Topband: Twinax
To: <topband at contesting.com>
Message-ID: <843E007272B6430B88C1B717BD3635EA at ownerPC>
Content-Type: text/plain; charset="us-ascii"
I am looking for a cheap source of some Twinax. Or someone who wants to
part
with about 150' feet for my new Waller Flag project.
Larry W8VVG
------------------------------
Message: 7
Date: Fri, 10 Sep 2010 17:39:21 +0200
From: Mauri <i4jmy at iol.it>
Subject: Re: Topband: 160 wire yagi
To: Pete Parisetti <hb9dsu at gmail.com>
Cc: topband at contesting.com
Message-ID: <4C8A5129.4080407 at iol.it>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Yes, it's true.
For some years I used a fixed two elements wire yagi @200 ft (almost
straight elements), remotely tuning the passive element as a director or
a reflector.
Some precise open wire trasmission line and element lenght allowed a
remote capacitor to give the needed amount reactance and reverse its
sign. (-j +j)
The antenna pattern was good enough while bandwith was pretty small. So
far, the passive element had to be tuned precisely from the shack to
keep currents high in any portion of the band. Obviously, this feature
made the "split" operation a bit tricky.
Since the yagi impedance changes if the passive elements tunes as a
reflector or director (the spacing was 0.14Wl), and 1.8Mhz is a wide
band (must think about in percent), a flat match was impossible all over
the band and the antenna SWR was a compromise.
Most of the times, in the favourable headings, the antenna had the same
reception of a 660 ft terminated beverage, sometimes it was better,
someother worse.
While producing a big signal, receivers suffered because of the huge
signals of medium distance continental stations and for the same reason
it was not uncommon to sutruggle because of "splattering" and clicks.
(as you lower the antenna from ground below half wave, this problem rises)
Height from ground was (and remains) a key factor and it's not so easy
to keep the yagi elements far enough from terrain.
All considered, unless one has a peculiar situation to utilize, a
vertical tower as a transmitting antenna and a separate receiving system
(I'd suggest beverages) could be an easyer, but very effective approach
for Dxing on 160m.
73,
Mauri I4JMY
Il 10/09/2010 9.49, Pete Parisetti ha scritto:
> Top contest station IR4T in Modena, Italy, has a two element wire beam
> suspended from a water tower at 210'. Performance, as I remember from 15
> years ago, was astounding - once we managed to break the US pileup on
> 4U1UN...
>
> The design was the work of Maurizio, I4JMY, who I believe reads this
list.
> You may want to contact him directly for more information.
>
> 73/DX
>
> Pete
>
> On Thu, Sep 9, 2010 at 9:18 PM, Craig Clark<jcclark at myfairpoint.net>
wrote:
>
>
------------------------------
Message: 8
Date: Fri, 10 Sep 2010 12:53:49 -0300
From: "Jorge Diez - CX6VM" <cx6vm.jorge at adinet.com.uy>
Subject: Re: Topband: 160 wire yagi
To: "'Mirko S57AD'" <miroslav.sibilja at amis.net>,
<topband at contesting.com>
Message-ID: <006301cb5100$5cc70db0$16552910$@jorge at adinet.com.uy>
Content-Type: text/plain; charset="iso-8859-1"
Thanks to all for the help.
Seems will not work right in my situation.
I have plan to rise a 190 ft tower having in mind the Comtek system of four
folded slopers, like K3LR use, maybe next year.
So this tall tower also will help to build the wire yagi, but I understood
from your suggestions that will be better the slopers system. At least to
have four directions.
Anyway how about a 3 element wire yagi and one of the slopers in the K3LR
system to the same direction in GAIN, wich one will have more gain?
About phased verticals I have a problem that is not good for me to put too
many radials in the farm, so I prefer something without radials.
Thanks again
73,
Jorge
CX6VM/CW5W
-----Mensaje original-----
De: topband-bounces at contesting.com [mailto:topband-bounces at contesting.com]
En nombre de Mirko S57AD
Enviado el: Viernes, 10 de Septiembre de 2010 07:36 a.m.
Para: topband at contesting.com
Asunto: Re: Topband: 160 wire yagi
Hi Jorge,
some 20 years ago at YU1EXY, we spread sloping dipole and reflector (30m
apart) from 60m tall building to SW (at 45? angle), which created sloped
(semi vertical) yagi toward NW and which performed excellently. At
opposite side of building we had 3 el wire yagi for 80, made in same
fashion.
As far as I can recall, guys from Bologna (Italy) used 2 el inv V wire
yagi (switchalbe) at their "fungi" (water tower) shack, which also
preformed excellently.
IMHO, you need very tall supports for wire yagis, so IMHO it would be
better to build either wire 4-square or maybe sloping dipole array.
K3LR array would be excellent solution as well...
73 Mirko, S57AD
Na 9/8/2010 6:54 PM, Jorge Diez - CX6VM je pisal:
> Hello,
>
>
>
> Anyone tried a 160 mts wire yagi?
>
>
>
> Will appreciate some info about the performance and construction.
>
>
>
> I have a 120 ft tower and some big trees far apart, my idea is to do the
> wire yagi from the tower to the tree. The heights are not the same, will
> have a rope from from 120 ft high in the tower to 55 ft high in the tree
> where I will hang the elements, sloping to the ground.
>
>
>
> I have a tree in front of the tower and in the back, so I can do the yagi
> with the reflector lower than the driven element and the director, or
> viceversa, wich one is better?
>
>
>
> 73,
>
> Jorge
>
> CX6VM/CW5W
>
> _______________________________________________
> UR RST IS ... ... ..9 QSB QSB - hw? BK
>
>
_______________________________________________
UR RST IS ... ... ..9 QSB QSB - hw? BK
------------------------------
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End of Topband Digest, Vol 93, Issue 9
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