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sadat007
Joined: 01 Jan 1970
Posts: 428
Helped: 6
Location: Pakistan
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 14 Nov 2005 5:37 antenna 1.9ghz |
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Hi,
I want to made a YAGI Antenna for 1.9 GHz CDMA/PCS can any one help me please? in detail
Thanks
Sadat
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vfone
Joined: 10 Oct 2001
Posts: 2328
Helped: 327
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14 Nov 2005 8:52 simple 1.9 ghz antena |
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Use this Java script to design the Yagi Antenna:
http://www.dxzone.com/cgi-bin/dir/jump2.cgi?ID=11183
Beware that in GSM (due to delay reasons) you cannot be more than 35km far from the Base Station, doesn’t matter what antenna systems you are using.
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sadat007
Joined: 01 Jan 1970
Posts: 428
Helped: 6
Location: Pakistan
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14 Nov 2005 13:52 pcs yagi antenna |
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Hi,
Thanks nice link
But still not simple for me because this is my first experience on antenna.
When I try I got following results with a warning.
1900 MHz, 11 Elements, 12.293 dBd Estimated Gain
35.5 Degrees Horizontal Beam Width
37.3 Degrees Vertical Beam Width
1.25" Diameter, Metalic Boom with Bonded Elements. Boom Correction of -4.203 applied.
class="special" align=justify> Warning: Boom Diameter is too large. The Diameter of a Metalic Boom should be less than 00.373 (0-3/8")
Electrical Boom Length of 15.6" (1' 3-41/64"). Allow for overhang when cutting boom to length.
00.124" (0-1/8") Driven Element Diameter.
00.124" (0-1/8") Parasitic Element Diameter.
Suggested Stacking Distance for 2 Yagis:
8.9" (0' 8-59/64") Horizontally
8.5" (0' 8-31/64") Vertically
0.019" (1/64") Dimensional tolerance required for element lengths.
Then did some changes as the diameter of all RODs I like to be same to 0.124".
And got results.
1900 MHz, 11 Elements, 12.293 dBd Estimated Gain
35.5 Degrees Horizontal Beam Width
37.3 Degrees Vertical Beam Width
00.12" Diameter, Metalic Boom with Bonded Elements. Boom Correction of 00.412 applied.
Electrical Boom Length of 15.6" (1' 3-41/64"). Allow for overhang when cutting boom to length.
00.124" (0-1/8") Driven Element Diameter.
00.124" (0-1/8") Parasitic Element Diameter.
Suggested Stacking Distance for 2 Yagis:
8.9" (0' 8-59/64") Horizontally
8.5" (0' 8-31/64") Vertically
0.019" (1/64") Dimensional tolerance required for element lengths.
Am I doing right?
Some Questions.
Metalic Boom ?
Metalic Boom with Bonded Elements?
Boom Correction ?
Electrical Boom Length of 15.6" (1' 3-41/64"). Allow for overhang when cutting boom to length????????????????? what does it mean?
Actually I need A to Z help for this project.
Thanks
Sadat Hussain
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vfone
Joined: 10 Oct 2001
Posts: 2328
Helped: 327
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14 Nov 2005 15:18 how to build the driver element in yagi antenna |
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Some fine adjustment (like metallic or non-metallic boom) that use this program, do not influence too much the characteristics.
Metallic boom means that the elements are going direct through the boom, with no isolation (this is the simplest way to build the antenna).
For boom correction take the default values of the program. For antenna hanging you can mount a bracket to the end (before reflector) or in the middle.
I remember that I build once a PCS Yagi using this program, and was working nice.
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sadat007
Joined: 01 Jan 1970
Posts: 428
Helped: 6
Location: Pakistan
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15 Nov 2005 21:21 1.9 ghz antenna build |
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Hi,
Still some questions, as I am very new to antennas.
Can I use Square shaped Metalic Bonded BOOM and the Elements are going through it with same calculations on the page that actually calculating for circulated Boom, if I understand correct?
As far as I understand the Reflector is also Bonded and going through Boom?
DL6WU and ARRL designs ??? which you recommend.
Can I use solid aluminum rods for both Elements and Boom?
Can I use other metals like stainless steel etc.
I am doing as the suggestd limitations but getting warning now!!!!!!
1900 MHz, 11 Elements, 12.293 dBd Estimated Gain
35.5 Degrees Horizontal Beam Width
37.3 Degrees Vertical Beam Width
00.4" Diameter, Metalic Boom with Bonded Elements. Boom Correction of 00.673 applied.
class="special" align=justify> Warning: Boom Diameter is too large. The Diameter of a Metalic Boom should be less than 00.373 (0-3/8")
Electrical Boom Length of 15.6" (1' 3-41/64"). Allow for overhang when cutting boom to length.
00.124" (0-1/8") Driven Element Diameter.
00.124" (0-1/8") Parasitic Element Diameter.
Suggested Stacking Distance for 2 Yagis:
8.9" (0' 8-59/64") Horizontally
8.5" (0' 8-31/64") Vertically
0.019" (1/64") Dimensional tolerance required for element lengths.
I have seen a Yagi Antenna for about 1850-1990 MHz and about 12db gain but is quite bigger and the elements are about 0.5" in Diameter and the number of total elements are 11+1+1=13. Square Boom and Bonded through Elements. Any comments?
There is an impedance matching problem too 50/75 to 300 ohms and suggested solutions on the same site, can I remove Dipole and use simple drive element for the same?
Parasitic Element ??????????
Thanks
Sadat Hussain
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sadat007
Joined: 01 Jan 1970
Posts: 428
Helped: 6
Location: Pakistan
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18 Nov 2005 6:14 177mhz yagi |
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Hello Vfone
No one arround to help? 
thanks
Sadat
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Google
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18 Nov 2005 6:14 Ads |
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vfone
Joined: 10 Oct 2001
Posts: 2328
Helped: 327
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18 Nov 2005 11:32 what does cdma pcs mean |
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-It is a small difference when using square shape instead circular shape for the boom, but not significant. You can go with square.
-Reflector is going also through the boom and is bonded.
-I would go for ARRL type. It works better in vertical position. (Don’t forget that you have to put the antenna in vertical position. All the BS antennas are vertical polarized).
-You can use aluminum for both, for elements and for boom (actually is recommended).
-As a driven element the best is to use a Folded Dipole:
http://www.dxzone.com/cgi-bin/dir/jump2.cgi?ID=11183
In this way you can obtain the necessarily PCS bandwidth, that is ~140MHz.
-About parasitic elements I think the author is thinking to the nearby elements that affect the resonant frequency of the driven element.
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john biles
Joined: 01 Dec 2005
Posts: 1
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01 Dec 2005 12:22 simple antena 1.9 ghz |
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Hello I am new to this forum,
I used the same website to design a TV antenna with the online program.
I replace the folder dipole with a standard dipole ( 2 rods with each wire connected to each rod ) and played around with the lengths until i got what i wanted.
being 1.9Ghz the 2 pieces of rod are most likely going to be around 37mm long each. I would start with 40mm long each and file half a "mm" off each rod until i got the best reception. I recommend you write down the each modification you do so that you go back over it to see what works and what doesn't.
To tell you the truth the antenna that is sitting on the roof of my house is a combination of a 538MHz Yagi and 210MHz yagi and it picks up digital TV 90kms form the transmitter in the frequency range of 177MHz to 226.5Mhz.
538Mhz director elements 210MHz Driver element and 177Mhz Reflector element.
So my advice to you is experiment, experiment it took me 2 months in the shed and on the roof to get what I wanted, you can to. Good luck.
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aliraza
Joined: 03 Nov 2004
Posts: 19
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03 Jun 2006 12:56 1.9ghz yagi |
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I have to design YAGI at 450Mhz?Plz guide me where to start.
Also do anyone have research papers relating to yagi design/performance in 450MHz reigon.
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