Off Topic - Antenna Design Software
Brian Howell
I am thinking about
designing and building a Yagi antenna for 54.310 MHz, I don't
need much gain, just a simple 3 element antenna. I have asked
around and have been referred to a few online calculators for
Yagi design. Today I found a pretty good Excel calculator
http://on5au.be/content/a10/trans/ant-design.html that is not
just a cookie cutter calculator like the online versions which
is better but I would also like to be able to see the radiation
pattern and SWR graphs.
I tried for many hours on Monday to design the Yagi in 4NEC2 because it has a CAD type interface for creating the antenna, which I like but it still leaves a lot to be desired. I got hung up on running the optimizer, it was asking for variables but they were blank and I have little idea of what I should put in there. I found a couple of online tutorials but They did little explaining on the ins and outs of the variables that is supposed to be entered into the program.
I did a lot of searching online today for an easy to use program,
I guess with my getting older, my brain is hardening a lot more
than it use to because I am having a lot of trouble to orient my
thinking to be able to use even 4NEC2. All of the "free" programs
are difficult, not user friendly, or just won't run on Windows
10.
Today I found a program called PCAAD 7.0. http://antennadesignassociates.com/pcaad7.htm I couldn't find any reviews for it, The user manual has some explanation on how the software works but I would have to buy it in order to really try it. At $549 it is a bit steep, however it "appears" easy to use and covers a lot of different antenna types, including Yagi type. So my question is: Does anyone have any knowledge of this program? or has anyone used it before? Is it really easy to use? And does it do a really good job?
Thanks, Brian Howell |
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doug
On 9/8/20 8:54 PM, Brian Howell wrote:
I should think that unless you are in an engineering lab, with a corporation to pay for your software, it would be ridiculous to buy PCAAD. Buy a copy of the ARRL Antenna Book from the ARRL. It probably has a 3 element yagi for 6 meters in there--just shorten the elements a tiny bit to get to 54.1MHz. What's there, anyway? Doug, WA2SAY, retired RF Engineer. |
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David Hopkins
Brian,
Have a look at :-
The program is based on the work of
DL6WU, The farther of amateur Yagi antennas.
David
On 2020-09-09 10:54 am, Brian Howell
wrote:
-- Definitely not sent from an I-Phone David G Hopkins (VK4ZF) |
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jdow
If you want to pay try EXNEC. For most uses MANA-GAL
has good support. And there is a free version.
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{^_^} On 20200908 21:53:29, David Hopkins
wrote:
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Alan
I am thinking about designing and building a Yagi antenna for 54.310 MHz, I don't need much gain, just a simple 3 element antenna.Brian, If that is all you want then any design that suits you will work. Simple Yagis are well understood, small variations in construction will have no practical effect on performance. As Doug says, scale down a 6m design. 73 Alan G4ZFQ |
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Siegfried Jackstien
mmana is easy to use ... free ... and has a nice editor
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if you ever used any "paint" software in windows then you can use that editor (click at start of line, hold mouse button to pull your line and release at end) ... very easy in my view greetz sigi dg9bfc Am 09.09.2020 um 02:44 schrieb doug:
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Brian Howell
I am wanting to put together a forward
scatter meteor detection system. I will attempt to pick up
reflected TV pilot carrier signals from channels 2-6,
particularity channel 2. I will look up the antenna book.
Brian Howell
From: doug
[mailto:dmcgarrett@...]
Sent: Tuesday,
September 8, 2020, 10:44 PM
Subject:
[SDR-Radio] Off Topic - Antenna Design Software
On 9/8/20 8:54 PM, Brian Howell wrote: I should think that unless you are in an engineering lab, with a corporation to pay for your software, it would be ridiculous to buy PCAAD. Buy a copy of the ARRL Antenna Book from the ARRL. It probably has a 3 element yagi for 6 meters in there--just shorten the elements a tiny bit to get to 54.1MHz. What's there, anyway? Doug, WA2SAY, retired RF Engineer. |
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Brian Howell
Ahh! Thank you for the link. I will take
a look at that. I hadn't need that one before.
Thank you.
Brian Howell
From: David
Hopkins [mailto:davhop@...]
Sent:
Wednesday, September 9, 2020, 12:53 AM
Subject:
[SDR-Radio] Off Topic - Antenna Design Software
Brian,
Have a look at :-
The program is based on the work of
DL6WU, The farther of amateur Yagi antennas.
David
On 2020-09-09 10:54 am, Brian Howell
wrote:
-- Definitely not sent from an I-Phone David G Hopkins (VK4ZF) |
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Brian Howell
I will take a look. I thought I had looked
at MANA-GAL before, something didn't work out with it. . . I
will take a look again at it to refresh my memory.
Brian Howell
From: jdow
[mailto:jdow@...]
Sent:
Wednesday, September 9, 2020, 2:59 AM
Subject:
[SDR-Radio] Off Topic - Antenna Design Software
If you want to pay try EXNEC. For most
uses MANA-GAL has good support. And there is a free version. {^_^} On 20200908 21:53:29, David Hopkins
wrote:
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Brian Howell
That is good. I have little experience
with building antennas so I was expecting to have to be precise
down to the micron.
Brian Howell
From: Alan via
groups.io [mailto:alanzfq@...]
Sent:
Wednesday, September 9, 2020, 1:17 AM
Subject:
[SDR-Radio] Off Topic - Antenna Design Software
I am thinking about designing and building a Yagi antenna for 54.310 MHz, I don't need much gain, just a simple 3 element antenna.Brian, If that is all you want then any design that suits you will work. Simple Yagis are well understood, small variations in construction will have no practical effect on performance. As Doug says, scale down a 6m design. 73 Alan G4ZFQ |
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Brian Howell
I will look at mmana again I think I looked
at that program before but it either didn't work or something
else happened, I will take a look again. I do use Photoshop and
Autocad so I should be able to handle the editor.
Thanks,
Brian Howell
From: Siegfried
Jackstien [mailto:siegfried.jackstien@...]
Sent:
Wednesday, September 9, 2020, 7:17 AM
Subject:
[SDR-Radio] Off Topic - Antenna Design Software
mmana is easy to use ... free ... and has a nice
editor
if you ever used any "paint" software in windows then you can use that editor (click at start of line, hold mouse button to pull your line and release at end) ... very easy in my view greetz sigi dg9bfc Am 09.09.2020 um 02:44 schrieb doug:
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jdow
Typo alert that's EZNEC. Note that these programs
can be rather addicting. And the quality of the output varies with
the quality of the input, including complete description of the
antenna and other metal objects in the area.
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{^_^} On 20200909 16:31:18, Brian Howell
wrote:
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jdow
The [MMANA-GAL] groups.io list MIGHT be of
interest.
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Show quoted text
But for a generic three element yagi the "ideal" radiation pattern is very well known and widely published. What you will get in reality is modified by your surroundings. And a complete description is "daunting" and can overload most simulation engines and computers. The easy way out is to take a standard design with the characteristics close to what you want and run with it. I doubt fractions of a dB differences are going to affect your results to any huge degree. {^_^} On 20200909 16:35:34, Brian Howell
wrote:
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Brian Howell
Thanks! I will take a look at the group.
I'm waiting on the updated version of NanoVNA V2 before I buy
one of those, that will help a lot I believe, if I am able to
build an antenna. At least I'll be able to measure the
impedance and SWR of what I make to see how close it is to what
I am wanting. I have no test equipment to speak of when it
comes to antennas so whatever I make may inefficient in many
ways. I'll have to look into how the driven element is attached
to the coax. I've read that two strait rods are around 75 ohms
or so but fold them and they are around 300, I remember that
from the days of when I was wanting to build mu own TV antenna
way back in my teens and twenty's. With 50 ohm I've seen
pictures of a dipole with a third short rod attached to one side
under one of the dipoles and some with ferrite rings, ect. .
I'm just hoping all I need to two dipoles to make it simple.
Thanks,
Brian Howell
From: jdow
[mailto:jdow@...]
Sent:
Wednesday, September 9, 2020, 8:08 PM
Subject:
[SDR-Radio] Off Topic - Antenna Design Software
The [MMANA-GAL] groups.io list MIGHT be
of interest. But for a generic three element yagi the "ideal" radiation pattern is very well known and widely published. What you will get in reality is modified by your surroundings. And a complete description is "daunting" and can overload most simulation engines and computers. The easy way out is to take a standard design with the characteristics close to what you want and run with it. I doubt fractions of a dB differences are going to affect your results to any huge degree. {^_^} On 20200909 16:35:34, Brian Howell
wrote:
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Tom Crosbie G6PZZ
Also look up the Gamma Match Brian. It’s how the best match was obtained with the old MET antennas in the 80’s. Mechanically quite easy to do with the driven element connected to the boom electrically. I can help more on describing this but I’m on another mission today.
Tom G6PZZ
From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io>
On Behalf Of Brian Howell
Sent: 10 September 2020 10:03 To: main@SDR-Radio.groups.io Subject: Re: [SDR-Radio] Off Topic - Antenna Design Software
Thanks! I will take a look at the group. I'm waiting on the updated version of NanoVNA V2 before I buy one of those, that will help a lot I believe, if I am able to build an antenna. At least I'll be able to measure the impedance and SWR of what I make to see how close it is to what I am wanting. I have no test equipment to speak of when it comes to antennas so whatever I make may inefficient in many ways. I'll have to look into how the driven element is attached to the coax. I've read that two strait rods are around 75 ohms or so but fold them and they are around 300, I remember that from the days of when I was wanting to build mu own TV antenna way back in my teens and twenty's. With 50 ohm I've seen pictures of a dipole with a third short rod attached to one side under one of the dipoles and some with ferrite rings, ect. . I'm just hoping all I need to two dipoles to make it simple.
Thanks, Brian Howell
From: jdow [mailto:jdow@...] Sent: Wednesday, September 9, 2020, 8:08 PM Subject: [SDR-Radio] Off Topic - Antenna Design Software
The [MMANA-GAL] groups.io list MIGHT be of interest. On 20200909 16:35:34, Brian Howell wrote:
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Brian Howell
Ahhh okay. Thanks! Yeah, that was what I
was talking about. . . I'll have to study up on that.
Brian Howell
From: Tom
Crosbie G6PZZ [mailto:tom@...]
Sent: Thursday,
September 10, 2020, 5:17 AM
Subject:
[SDR-Radio] Off Topic - Antenna Design Software
Also look up the Gamma Match Brian. It’s how the best match was obtained with the old MET antennas in the 80’s. Mechanically quite easy to do with the driven element connected to the boom electrically. I can help more on describing this but I’m on another mission today.
Tom G6PZZ
From: main@SDR-Radio.groups.io
<main@SDR-Radio.groups.io>
On Behalf Of Brian Howell
Sent: 10 September 2020 10:03 To: main@SDR-Radio.groups.io Subject: Re: [SDR-Radio] Off Topic - Antenna Design Software
Thanks! I will take a look at the group. I'm waiting on the updated version of NanoVNA V2 before I buy one of those, that will help a lot I believe, if I am able to build an antenna. At least I'll be able to measure the impedance and SWR of what I make to see how close it is to what I am wanting. I have no test equipment to speak of when it comes to antennas so whatever I make may inefficient in many ways. I'll have to look into how the driven element is attached to the coax. I've read that two strait rods are around 75 ohms or so but fold them and they are around 300, I remember that from the days of when I was wanting to build mu own TV antenna way back in my teens and twenty's. With 50 ohm I've seen pictures of a dipole with a third short rod attached to one side under one of the dipoles and some with ferrite rings, ect. . I'm just hoping all I need to two dipoles to make it simple.
Thanks, Brian Howell
From: jdow [mailto:jdow@...] Sent: Wednesday, September 9, 2020, 8:08 PM Subject: [SDR-Radio] Off Topic - Antenna Design Software
The [MMANA-GAL] groups.io list MIGHT be
of interest. On 20200909 16:35:34, Brian Howell wrote:
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This thread reminds me of a sticker on the helm of my Tiki Barge (next to the blender on the bar):
Since you are NOT transmitting, SWR really doesn't matter all that much. Why not use the tried and true method of a dipole cut for 54.310Mhz and the reflector 5% longer and director 5% shorter. The spacing set to .125 the wavelength on the director/reflector distance to driven element. We use the above numbers for our 3 element 40M wire beam at Field Day every year with great success as both a TX and RX antenna. Occam's Razor comes to mind here as well as the KISS method. JMHO 73 Kriss KA1GJU |
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Brian Howell
You may be right. Since I have never built
an antenna like this before I'm also using it as an education
tool for myself. I'd like to know enough and learn enough so
that if another project comes up in the future I'll be able to
run a design program and spit out an accurate model that I know
is correct to build a different antenna. Since I have no
personal reference for what works and what doesn't or what is
good enough and what is overkill I am leaning toward overkill as
a reference then backing off as I gain experience and
knowledge. If I am able to complete this project and learn more
about antenna design and if I build other antennas in the future
I may get to the point you are now and look back at this and say
"I was going way overboard, I could have just plugged in some
ratios and I could have saved myself a lot of time and
trouble". I guess I have to start somewhere, I just feel better
about a project when I have an idea of what works and what the
outcome will be. I would hate to spend all this money on tools,
metal stock, and hours of effort only to find out that a coat
hanger does a better job than my antenna and not knowing why my
antenna did so poorly.
Brian Howell
From: Kriss
Kliegle KA1GJU [mailto:kliegle@...]
Sent: Thursday,
September 10, 2020, 8:11 AM
Subject:
[SDR-Radio] Off Topic - Antenna Design Software
This thread reminds me of a sticker on the helm of my Tiki Barge
(next to the blender on the bar): Since you are NOT transmitting, SWR really doesn't matter all that much. Why not use the tried and true method of a dipole cut for 54.310Mhz and the reflector 5% longer and director 5% shorter. The spacing set to .125 the wavelength on the director/reflector distance to driven element. We use the above numbers for our 3 element 40M wire beam at Field Day every year with great success as both a TX and RX antenna. Occam's Razor comes to mind here as well as the KISS method. JMHO 73 Kriss KA1GJU |
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Alan G4ZFQ
effort only to find out that a coat hanger does a better job than my antennaBrian, That's the way! Use straightened coat hangers, I'd bet you would find it very difficult to prove a "proper" antenna was better. 73 Alan G4ZFQ Since you are NOT transmitting, SWR really doesn't matter all that much. Why not use the tried and true method of a dipole cut for 54.310Mhz and the reflector 5% longer and director 5% shorter. The spacing set to .125 the wavelength on the director/reflector distance to driven element. |
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Chris Smolinski
On Sep 10, 2020, at 9:12 AM, Alan G4ZFQ <alan4alan@...> wrote:Coincidentally I recently built this quick and dirty 8 element Yagi for 434 MHz. I used pieces of 14 gauge wire for the elements, coat hangers would have been better :)effort only to find out that a coat hanger does a better job than my antennaBrian, https://www.hfunderground.com/board/index.php/topic,69753.0.html Chris Smolinski Black Cat Systems Westminster, MD USA https://www.blackcatsystems.com |
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