Re: Topband: Skimmer calibration

[donovanf]

Iceland:  three people per square km

- Original Message -
From: Tracey Gardner 
To: topband@contesting.com
Sent: Wed, 20 Aug 2014 02:30:49 -0400 (EDT)
Subject: Topband:  Skimmer calibration


Hello Mike

 You forget that on this side of the pond, the majority of us live on pocket
handkerchief sized plots. :-)
The representative of a major building company in the UK was on TV yesterday
saying that 1000 sq ft was plenty big enough for a three bedroomed house.
I imagine that would be the area of one room in a lot of houses in the USA.
Even a K9AY needs a 30ft by 30ft space with a central support and a lot of
new builds here don't even have gardens that size.

You've only got to look at the population densities to begin to see the
problem

 Population density (people per sq. km of land area)

 USA  - 35
UK- 265
Netherlands - 498
France - 121
Germany - 231
Italy - 203

 We'd all love to have the space to put up phased arrays or Beverages
and even a Flag, K9AY, EWE, is out of the question for a large number of us.

 And as for quiet locations well for the vast majority of us those again are
 a thing of the past unless you go out portable.
Switched mode power supplies and cheap plasma TVs etc have seen to that.
Nothing comes with a good old linear power supply nowadays and any
power supply coming out of the Far East has got to be suspect

 73s Tracey G5VU



 On Tue, Aug 19, 2014 at 5:33 AM, Mike Waters  wrote:

> When I last investigated, all the skimmers and Web SDRs that were outside
> of North America all had terrible receive antennas for copying DX signals
> on 160. (And who knows how many of them are in quiet locations?)
>
> When I say "terrible", I mean small "magnetic" loops, very short whips, 
> low dipoles, a random end-fed wire, etc. No phased arrays or Beverages, 
> and not even a Flag, K9AY, EWE, etc.
>
> Does anyone know if that is still the case?
>
> 73, Mike
> www.w0btu.com
> _
> 

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Re: Topband: Skimmer calibration

[donovanf]

Iceland: three people per square km.  :)

- Original Message -
From: Tracey Gardner 
To: topband@contesting.com
Sent: Wed, 20 Aug 2014 02:30:49 -0400 (EDT)
Subject: Topband:  Skimmer calibration


Hello Mike

 You forget that on this side of the pond, the majority of us live on pocket
handkerchief sized plots. :-)
The representative of a major building company in the UK was on TV yesterday
saying that 1000 sq ft was plenty big enough for a three bedroomed house.
I imagine that would be the area of one room in a lot of houses in the USA.
Even a K9AY needs a 30ft by 30ft space with a central support and a lot of
new builds here don't even have gardens that size.

You've only got to look at the population densities to begin to see the
problem

 Population density (people per sq. km of land area)

 USA  - 35
UK- 265
Netherlands - 498
France - 121
Germany - 231
Italy - 203

 We'd all love to have the space to put up phased arrays or Beverages
and even a Flag, K9AY, EWE, is out of the question for a large number of us.

 And as for quiet locations well for the vast majority of us those again are
 a thing of the past unless you go out portable.
Switched mode power supplies and cheap plasma TVs etc have seen to that.
Nothing comes with a good old linear power supply nowadays and any
power supply coming out of the Far East has got to be suspect

 73s Tracey G5VU



 On Tue, Aug 19, 2014 at 5:33 AM, Mike Waters  wrote:

> When I last investigated, all the skimmers and Web SDRs that were outside
> of North America all had terrible receive antennas for copying DX signals
> on 160. (And who knows how many of them are in quiet locations?)
>
> When I say "terrible", I mean small "magnetic" loops, very short whips, 
> low dipoles, a random end-fed wire, etc. No phased arrays or Beverages, 
> and not even a Flag, K9AY, EWE, etc.
>
> Does anyone know if that is still the case?
>
> 73, Mike
> www.w0btu.com
> _
> 

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Re: Topband: Modeling the proverbial "vertical on a beach"

[donovanf]

It's not necessary to place a vertical antenna at waters edge to gain the low 
angle efficiency advantages of an oceanfront site.  There are two zones of 
interest: the area immediately adjacent to the antenna which primarily affects 
efficiency (very important for transmitting and very unimportant for top band 
receiving) and the Fresnel Zone which is very important for the very low angles 
that difficult to achieve at most land sites.   Salt marshes (e.g., W1KM) are 
practical for long term installation but antennas over ocean water are rarely 
practical except on ships.  The most practical ocean front permanent 
transmitting antenna is a land based vertical over an extensive radial system 
sited so that most of its Fresnel Zone is over salt water.

73
Frank
W3LPL




- Original Message -
From: Guy Olinger K2AV 
To: Tom W8JI 
Cc: Mark Connelly , TopBand List 

Sent: Tue, 19 Aug 2014 21:21:03 -0400 (EDT)
Subject: Re: Topband: Modeling the proverbial "vertical on a beach"

On Tue, Aug 19, 2014 at 11:24 AM, Tom W8JI  wrote:
> Why would it matter?
>
> The receiving antenna does not matter, provided it responds to the wave
> angle at the receive site. It doesn't matter if it is loop, a 10 foot
> vertical, or a 200 foot vertical so long as the antenna does not null the
> primary wave angle for the incoming signal. It does not matter if it is a
> large receiving array or a whip, provided each are not nulling the primary
> signal arrival.

Or giving advantage to one or the other incoming angle in effect setting
the primary signal arrival

Not using a small omni RX antenna for this experiment introduces some
serious calculation issues. E.g. if the RX setup has pattern and gain, we
first have to know what incoming angle and direction a signal is arriving
at and then divide the pattern out BEFORE any comparisons are made. So how
do we know that?   VOACAP has that built in where you are supposed to
supply the RX pattern, which otherwise defaults to omni.

No pattern is required to eliminate direction and elevation arrival
adjustments to reported readings if the antenna is truly omni. If the RX
antenna is "omni" and low enough then any enhancements are due to the
propagation or environment or the TX station's antennas, which is what you
WANT to see.

FURTHER, since nearly all ham TX antennas are NOT at water's edge, then any
tests looking for water's edge enhancement must do so by placing RX at
water's edge and placing another identical RX/antenna back on the beach a
few hundred feet off and another identical RX/antenna at typical shore site
antenna-distance-from-actual-water's edge as in 1500 feet for W2GD and
K3ZM.

Putting up and maintaining TX antennas right at water's edge and feedline
back to safe location for transceivers, etc, is something that likely
unworkable or will not be tolerated by those controlling public beach
fronts, would be a maintenance nightmare to begin with. These include such
things as guy anchors under water on the beach, that will not come loose
under typical random sand rearrangement underwater. Or continuous
corrosive/shorting salt spray on metal and insulators. Or exposure to
vandalism.

RX skimmers with a short antenna can be made very small, battery charged by
solar power, completely enclosed in smallish sealed box and communicating
with the internet via wifi back off the beach.  They can be put on top of
pier poles, etc, and completely controlled remotely.

73, Guy
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Topband: Low-angle radiation from vertical antennas

[Dan Maguire via Topband]

This is somewhat related to the "vertical on a beach" thread but I figured if I 
put that in the subject line I might get lynched.

In the past there have been questions about the accuracy of NEC far field 
calculations at low take-off angles for vertical antennas since the far field 
does not include the ground wave.  To help resolve the issue I modeled a λ/4 
vertical with and without the ground wave at multiple slant (radial) distances 
and plotted the results.

This is for the 160m band at 10°, 1°, and 0.1° take-off angles with slant 
(radial) distances varying from 100 m to 100 km:

http://ac6la.com/adhoc/VertFlds9.png

And this is for 40m:

http://ac6la.com/adhoc/VertFlds10.png

As expected, the far field values decay at a "1/r" rate.  With log-log scales 
that's a one decade decrease for every one decade increase in radial distance.  
At close-in distances the far field does indeed under-estimate the total field 
which includes ground wave.  However, for typical sky wave propagation the 
difference has vanished (plot lines converged) long before the ionosphere has 
been reached.

For each of the 3 take-off angles, calculations were done at 100 different 
distances in order to get smooth curves.  Obviously I didn't do those one at a 
time; I used AutoEZ with 100 test cases.  Each test case generated an EZNEC 
"Setups > Near Field" like this.

http://ac6la.com/adhoc/VertFlds5.png

Near Field calculations report the total field, including the ground wave, and 
are valid at any distance from the antenna.  For the Far Field, also done for 
each test case, AutoEZ can convert the dBi values produced by EZNEC to the 
corresponding mV/m field strengths.

Dan, AC6LA
http://ac6la.com

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Re: Topband: Switching Pennants

[Don Kirk]

Hi Dwight,

I have 3 point fed pennants that share the same feedpoint and use only one
BN-73-202 Binocular Core Transformer matching transformer at the feedpoint
(one pennant pointing 40 degrees, one pointing 160 degrees, and one
pointing 300 degrees) and have been using this system for over 3 years now
with no problems.  I use two relays (located at the common center location
of the pennants to select the active pennant, and disconnect both sides of
the pennants that are not active from the matching transformer.

Switching 3 pennants is very easy as it only requires one isolated 12 volt
supply and a two conductor control cable from the shack out to the relay
box which is located at the feedpoint.  0 volts over the feedline selects
one pennant, +12 volts selects the second pennant, and -12 volts (just
reversing polarity of the power supply connected to the control line)
selects the 3rd pennant.

Here is a link to a simple website I have that documents my 3 pennant
system, and you can see a picture of the inside of my relay box on this
website.
http://sites.google.com/site/pennantflagantennas/

Simple and see no reason to do it any other way if using 3 pennants that
have a common center point location.

73,
Don



On Tue, Aug 19, 2014 at 7:59 PM, Tom W8JI  wrote:

> I would not switch high impedance lines without very special precautions.
>
> I really do not think it is worth the small parts savings.
>
> - Original Message - From: "DGB" 
> To: 
> Sent: Tuesday, August 19, 2014 4:38 PM
> Subject: Topband: Switching Pennants
>
>
>  I am wanting a simple way of switching 3 or 4 pennants. Anyone done this?
>>
>> Quote From K6SEE ... All four Pennants would be installed with their
>> points all adjacent to each other.  Only one feedline would be necessary
>> and only one
>> transformer would be necessary, with the high impedance winding of the
>> transformer being switched to the feedpoint of the Pennant in the desired
>> direction ... 73, de Earl, K6SE
>>
>> 73 Dwight NS9I
>> _
>> Topband Reflector Archives - http://www.contesting.com/_topband
>>
>>
>> -
>> No virus found in this message.
>> Checked by AVG - www.avg.com
>> Version: 2014.0.4745 / Virus Database: 4007/8063 - Release Date: 08/19/14
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Re: Topband: Switching Pennants

[Don Kirk]

Dwight,

Correction, I should have said 0 volts over the control line (not feedline)
selects one pennant, +12 volts selects the second pennant, and -12 volts
(just reversing polarity of the power supply connected to the control line)
selects the 3rd pennant.

Don


On Wed, Aug 20, 2014 at 7:11 AM, Don Kirk  wrote:

> Hi Dwight,
>
> I have 3 point fed pennants that share the same feedpoint and use only one
> BN-73-202 Binocular Core Transformer matching transformer at the feedpoint
> (one pennant pointing 40 degrees, one pointing 160 degrees, and one
> pointing 300 degrees) and have been using this system for over 3 years now
> with no problems.  I use two relays (located at the common center location
> of the pennants to select the active pennant, and disconnect both sides of
> the pennants that are not active from the matching transformer.
>
> Switching 3 pennants is very easy as it only requires one isolated 12 volt
> supply and a two conductor control cable from the shack out to the relay
> box which is located at the feedpoint.  0 volts over the feedline selects
> one pennant, +12 volts selects the second pennant, and -12 volts (just
> reversing polarity of the power supply connected to the control line)
> selects the 3rd pennant.
>
> Here is a link to a simple website I have that documents my 3 pennant
> system, and you can see a picture of the inside of my relay box on this
> website.
> http://sites.google.com/site/pennantflagantennas/
>
> Simple and see no reason to do it any other way if using 3 pennants that
> have a common center point location.
>
> 73,
> Don
>
>
>
> On Tue, Aug 19, 2014 at 7:59 PM, Tom W8JI  wrote:
>
>> I would not switch high impedance lines without very special precautions.
>>
>> I really do not think it is worth the small parts savings.
>>
>> - Original Message - From: "DGB" 
>> To: 
>> Sent: Tuesday, August 19, 2014 4:38 PM
>> Subject: Topband: Switching Pennants
>>
>>
>>  I am wanting a simple way of switching 3 or 4 pennants. Anyone done this?
>>>
>>> Quote From K6SEE ... All four Pennants would be installed with their
>>> points all adjacent to each other.  Only one feedline would be necessary
>>> and only one
>>> transformer would be necessary, with the high impedance winding of the
>>> transformer being switched to the feedpoint of the Pennant in the desired
>>> direction ... 73, de Earl, K6SE
>>>
>>> 73 Dwight NS9I
>>> _
>>> Topband Reflector Archives - http://www.contesting.com/_topband
>>>
>>>
>>> -
>>> No virus found in this message.
>>> Checked by AVG - www.avg.com
>>> Version: 2014.0.4745 / Virus Database: 4007/8063 - Release Date: 08/19/14
>>>
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>>
>
>
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Re: Topband: Skimmer calibration

[Carl]

- Original Message - 
From: "Tom W8JI" 

To: "topband" 
Sent: Tuesday, August 19, 2014 10:08 PM
Subject: Re: Topband: Skimmer calibration


BC antennas have the elaborate radial system in order to get that 
groundwave while the typical on ground ham vertical loses a lot of the 
0-10 degree (or more) radiation. Go to the beach to get it back.or go 
with elevated radials.





That just isn't factual at all. Radials under the vertical antenna have 
virtually no effect on wave angle unless they are sparse and grossly 
unbalanced, allowing them to radiate like a low horizontal antenna.


Radials change the efficiency, not the pattern, unless the radials radiate 
like a dipole.


73 Tom



Note that I didnt say anything about changing the pattern, just the energy 
included at low angles and where the efficiency starts at the base and at 
the often poorly understood Fresnel Zone if you really want more power in 
those low angles and not heating worms or sand granules.


Carl
KM1H

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Re: Topband: Switching Pennants

[Don Kirk]

Hi Dwight,

I just added the schematic of my 3 Pennant RX antenna switching system to
my website.
http://sites.google.com/site/pennantflagantennas/

Just FYI,
Don (wd8dsb)
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Re: Topband: Switching Pennants

[Tim Shoppa]

Most common K9AY relay-switching configuration involves a single
transformer, with relay-switching at the high impedance side, and just
inches of run from the transformer to the relays to the loops. The unused
loops are left open (not connected either side).

The proposed single-transformer pennant relay configuration sounds almost
exactly the same. (Except no "reversing relay" as termination is
symmetrical.)

Pennants are typically just a little bit higher impedance than K9AY, yes?

Tim N3QE


On Tue, Aug 19, 2014 at 7:59 PM, Tom W8JI  wrote:

> I would not switch high impedance lines without very special precautions.
>
> I really do not think it is worth the small parts savings.
>
> - Original Message - From: "DGB" 
> To: 
> Sent: Tuesday, August 19, 2014 4:38 PM
> Subject: Topband: Switching Pennants
>
>
>  I am wanting a simple way of switching 3 or 4 pennants. Anyone done this?
>>
>> Quote From K6SEE ... All four Pennants would be installed with their
>> points all adjacent to each other.  Only one feedline would be necessary
>> and only one
>> transformer would be necessary, with the high impedance winding of the
>> transformer being switched to the feedpoint of the Pennant in the desired
>> direction ... 73, de Earl, K6SE
>>
>> 73 Dwight NS9I
>> _
>> Topband Reflector Archives - http://www.contesting.com/_topband
>>
>>
>> -
>> No virus found in this message.
>> Checked by AVG - www.avg.com
>> Version: 2014.0.4745 / Virus Database: 4007/8063 - Release Date: 08/19/14
>>
>>  _
> Topband Reflector Archives - http://www.contesting.com/_topband
>
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Re: Topband: Skimmer calibration

[Tom W8JI]

I said:

That just isn't factual at all. Radials under the vertical antenna have 
virtually no effect on wave angle unless they are sparse and grossly 
unbalanced, allowing them to radiate like a low horizontal antenna.


Radials change the efficiency, not the pattern, unless the radials 
radiate like a dipole.


73 Tom



Note that I didnt say anything about changing the pattern, just the energy 
included at low angles and where the efficiency starts at the base and at 
the often poorly understood Fresnel Zone if you really want more power in 
those low angles and not heating worms or sand granules.


That, by definition, is a pattern change.

You said it improves groundwave. What you think happen just does not happen.

It improves efficiency. It does not change elevation pattern, it does not 
change Fresnel zone losses significantly. It does not improve groundwave any 
significant amount more than it changes sky wave.


This is because the "often poorly understood" Fresnel zone extends far 
beyond practical radial field area, and virtually all of the ground wave 
attenuation from soil losses is miles from the antenna over the entire long 
length of a path. It is not localized loss.


73 Tom


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Re: Topband: Skimmer calibration

[Carl]

I said:

That just isn't factual at all. Radials under the vertical antenna have 
virtually no effect on wave angle unless they are sparse and grossly 
unbalanced, allowing them to radiate like a low horizontal antenna.


Radials change the efficiency, not the pattern, unless the radials 
radiate like a dipole.


73 Tom



Note that I didnt say anything about changing the pattern, just the 
energy included at low angles and where the efficiency starts at the base 
and at the often poorly understood Fresnel Zone if you really want more 
power in those low angles and not heating worms or sand granules.


That, by definition, is a pattern change.

You said it improves groundwave. What you think happen just does not 
happen.


It improves efficiency. It does not change elevation pattern, it does not 
change Fresnel zone losses significantly. It does not improve groundwave 
any significant amount more than it changes sky wave.


This is because the "often poorly understood" Fresnel zone extends far 
beyond practical radial field area, and virtually all of the ground wave 
attenuation from soil losses is miles from the antenna over the entire 
long length of a path. It is not localized loss.


73 Tom



All of which is well known and well published.
You might ask Frank, W3LPL, or Richard Fry to explain it to you better than 
I seem to do since you appear to get hung up on the semantics.


Looking at the coastal AM BCB patterns I mentioned a week (WGBB 1240) ago or 
others recently will show you the effects of salt water and land.


Carl
KM1H

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Re: Topband: Skimmer calibration

[Jim Brown]

On Tue,8/19/2014 7:08 PM, Tom W8JI wrote:
Radials under the vertical antenna have virtually no effect on wave 
angle unless they are sparse and grossly unbalanced, allowing them to 
radiate like a low horizontal antenna.


Radials change the efficiency, not the pattern, unless the radials 
radiate like a dipole. 


On Wed,8/20/2014 9:05 AM, Tom W8JI wrote:
This is because the "often poorly understood" Fresnel zone extends far 
beyond practical radial field area, and virtually all of the ground 
wave attenuation from soil losses is miles from the antenna over the 
entire long length of a path. It is not localized loss. 


I agree completely with both of Tom's posts.

73, Jim K9YC
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Re: Topband: Skimmer calibration

[Carl]

- Original Message - 
From: "Jim Brown" 

To: 
Sent: Wednesday, August 20, 2014 12:48 PM
Subject: Re: Topband: Skimmer calibration



On Tue,8/19/2014 7:08 PM, Tom W8JI wrote:
Radials under the vertical antenna have virtually no effect on wave 
angle unless they are sparse and grossly unbalanced, allowing them to 
radiate like a low horizontal antenna.


Radials change the efficiency, not the pattern, unless the radials 
radiate like a dipole. 


On Wed,8/20/2014 9:05 AM, Tom W8JI wrote:
This is because the "often poorly understood" Fresnel zone extends far 
beyond practical radial field area, and virtually all of the ground 
wave attenuation from soil losses is miles from the antenna over the 
entire long length of a path. It is not localized loss. 


I agree completely with both of Tom's posts.

73, Jim K9YC



You should, he didnt say anything wrong.


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Topband: Ferrite beads

[Joe K2UF]

Anyone know if the ferrite beads that are encased on the cables of older CRT
monitors are any good for use in the shack. 

 

This has probably been asked before but I can not find any info.

 

Thanks ,

 

Joe K2UF 

 

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Topband: Low-angle radiation from vertical antennas

[Richard Fry]

Dan AC6LA wrote:
...To help resolve the issue I modeled a ?/4 vertical with and without the 
ground wave at multiple slant (radial) distances and plotted the results. 
etc


Dan's AutoEZ charts remove all doubt about the issue of whether or not the 
ground wave contributes to monopole radiation reaching the ionosphere.


Clearly, it doesn't.

R. Fry




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Re: Topband: Ferrite beads

[Carl]

Anyone know if the ferrite beads that are encased on the cables of older 
CRT

monitors are any good for use in the shack.

This has probably been asked before but I can not find any info.

Thanks ,

Joe K2UF


Since most of those come from Asia it is anyones guess what mixes are used 
by who. It would be simple enough to wind 10 turns, measure inductance and 
then zero in on the Al value using the published formula.


Carl
KM1H



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Re: Topband: Low-angle radiation from vertical antennas

[Guy Olinger K2AV]

So now NEC is definitive? Even with all it's known defects around the
edges? NEC is the process that indicates the unproven/undisproven notch.
 Measurements at aircraft altitudes and 25-50 km or hold one's peace.

73, Guy


On Wed, Aug 20, 2014 at 2:36 PM, Richard Fry  wrote:

> Dan AC6LA wrote:
>
>> ...To help resolve the issue I modeled a ?/4 vertical with and without
>> the ground wave at multiple slant (radial) distances and plotted the
>> results. etc
>>
>
> Dan's AutoEZ charts remove all doubt about the issue of whether or not the
> ground wave contributes to monopole radiation reaching the ionosphere.
>
> Clearly, it doesn't.
>
> R. Fry
>
>
>
>
> _
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>
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Re: Topband: New 3 el 160m yagi at 7J4AAL

[DL2OBO ( Carsten-Thomas Dauer)]

We went to Japan for our honeymoon in 2010 and were invited to visit 7J4AAL
for a few days.. 
I have heard about his 160m-Yagi plan at this time and was very excited  all
the years until now.
I talk to him and Masaru JA5AQC (with whom I went on a 23 day-round trip in
Europe 2012)  frequently on 80m.

Kan lives in a more quiet location compared to other JA QTH's .
Both large Yagis are on hill tops but there are also other hills around, so
it is not a hill top location with a flat terrain around.
He has multiple beverages, too.
The QTH is 200m or so next to a large hospital, other houses are further
away.
I enjoyed operating 80m with his 5 el yagi. Signals from EU were loud
enough, no need for special RX antennas at that time.
(guess different in other special static conditions)

You can see some pictures of the surroundings as well as from his 5el 80m
Yagi here..
http://www.dm9ee.de/operating_7J4AAL.html

I am looking forward to hear Kan on 160m


73 de Tom  www.DM9EE.de( ex DL2OBO )

PS:  check my homepage for other DX station QTHs



-Ursprüngliche Nachricht-
Von: Topband [mailto:topband-boun...@contesting.com] Im Auftrag von Gary and
Kathleen Pearse
Gesendet: Dienstag, 19. August 2014 22:13
An: topband List
Betreff: Re: Topband: New 3 el 160m yagi at 7J4AAL

I guess we’ll hear this 160 season from 7J4AAL. Living mid-path USA-JA
affords KL7’s the opportunity to receive both as W’s and others turn their
attention to JA. Why not give it a try if one has the motivation, real
estate, and resources?

And about which antenna is better? His 160 beam on a hill will outperform
what most of us will ever have available. 

I wonder what his noise floor will be, and if he employs receiving arrays?

Source:
http://www.cd-corp.com/english/
http://www3.ocn.ne.jp/~kan1/cy163tower.html

73, Gary NL7Y
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Diese E-Mail ist frei von Viren und Malware, denn der avast! Antivirus Schutz 
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Re: Topband: New 3 el 160m yagi at 7J4AAL

[DL2OBO ( Carsten-Thomas Dauer)]

Yes, the boom of the 5el 80m yagi is used as a 160m dipole.

160m and 80m yagis are on separate towers

While discussing about efficiency between yagis and vertical arrays it was
more the question, what Kan WANTED to build.
Sure he could have built a vertical array instead, but he didn't want to.

Otoh, the terrain for a 9 circle etc. is not really good at his QTH

73 Tom  www.DM9EE.de   ( ex DL2OBO )



-Ursprüngliche Nachricht-
Von: Topband [mailto:topband-boun...@contesting.com] Im Auftrag von Peter
Voelpel
Gesendet: Dienstag, 19. August 2014 19:48
An: 'Topband Reflector'
Betreff: Re: Topband: New 3 el 160m yagi at 7J4AAL

His CL75 CX-M 5-element 80m yagi is on the other tower and still in use.
The new 160m antenna was built on order by Create.

73
Peter

-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Richard
(Rick) Karlquist
Sent: Dienstag, 19. August 2014 19:29
To: Jim N7US; 'Topband Reflector'; CADXA Reflector
Subject: Re: Topband: New 3 el 160m yagi at 7J4AAL

The web site talks about a CL-75 Yagi, which operates as a dipole on 160
meters, and has
5 elements on 80.  Is there also some different antenna that is actually 3
elements on 160 meters?  My Japanese is a little rusty :-)

Rick N6RK

On 8/19/2014 9:22 AM, Jim N7US wrote:
>>From the reflector of the Northern IL DX Association.
>
> 73, Jim N7US
>
>
> From: ni...@yahoogroups.com [mailto:ni...@yahoogroups.com]
> Sent: August 19, 2014 07:49
> To: ni...@yahoogroups.com
> Subject: [NIDXA] New 3 el 160m yagi at 7J4AAL
>
>
> Now that is an antenna!
>
> http://www3.ocn.ne.jp/~kan1/newmonsterantenna2.html
>
> The three SteppIR DB42's look small!
>
>
> 73, John
> K9EL
>
> Posted by: "John, K9EL" 
>
>
>
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>
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Topband: Low-angle radiation from vertical antennas

[Richard Fry]

Guy Olinger wrote:

NEC is the process that indicates the unproven/undisproven notch.


Based on the AutoEZ charts linked here by AC6LA, the existence of this 
"notch" is true only if NEC is misused and/or misunderstood. 


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