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#1
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hi sos
hi every body
i want modelize a qudrafilar helix antenna utilizing ANSOFT Designer SV or with matlab but i dont know how create the geometry of the antenna if someone can help me to do it i'll be thankful thank you at advance |
#2
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hi sos
wrote in message ... hi every body i want modelize a qudrafilar helix antenna utilizing ANSOFT Designer SV or with matlab but i dont know how create the geometry of the antenna if someone can help me to do it i'll be thankful thank you at advance Hi "disc" I can model a Quadrafilar helix antenna with EZNEC. Roy has made it easy to model helix antennas. I can also offer you an antenna design concept that performs better than a Quad Helix for an antenna located on Earth and expected to have a hemispheric coverage with Circular Polarization. Google DCA APT antenna for satellite reception. Jerry KD6JDJ |
#3
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hi sos
hi Jerry KD6JDJ
yes i'll be thankful if u show how do it |
#4
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hi sos
wrote in message ... hi Jerry KD6JDJ yes i'll be thankful if u show how do it Hi "disc" I can help you a little with learning to use EZNEC to model a Quad Helix. I have a few Quad Helix antennas modeled for 137 MHz. That data is available to you. I can show you how to design your own hemispheric coverage antenna that will perform better than a Quad Helix for reception of signals from polar orbiting satallites. What do you want to do? Jerry KD6JDJ |
#5
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hi sos
On 6 juin, 16:05, "Jerry" wrote:
wrote in message ... On 6 juin, 00:03, "Jerry" wrote: wrote in message ... hi Jerry KD6JDJ yes i'll be thankful if u show how do it Hi "disc" I can help you a little with learning to use EZNEC to model a Quad Helix. |
#6
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hi sos
snip
hi "jerry" i want QHA models and i try to adapt them for 2GHZ it's for heliosynchron satellite for earth sensing thank u Hi "disc" Wow, thats a small Quad Helix. Tell me the dimensions. I'll try to model it for you using EZNEC. Is this a real project? That is, do you have the antenna, or are you planning to build one? If you have a "store bought" 2 GHz Quad helix, there are certainly some patterns available from the mnanufacturer. If you plan to build the Quad helix, are you able to make any impedance measurements of the model? As you know, the fundamental plan in the Quad Helix design is to make one loop radiate 90 degrees later than the other due to the impedance difference between the two loops. Jerry KD6JDJ Remember that gigahertz-level quad helixes used on satellites are usually multiturn devices. Model results for a 137-MHz, half-turn antenna scaled up to 2 GHz may not be appropriate. .... Rich W2RG |
#7
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hi sos
On 7 juin, 16:45, "Jerry" wrote:
wrote in message ... On 6 juin, 22:15, "Jerry" wrote: "Rich Griffiths" wrote in message xcommunications... snip hi "jerry" i want QHA models and i try to adapt them for 2GHZ it's for heliosynchron satellite for earth sensing thank u Hi "disc" Wow, thats a small Quad Helix. Tell me the dimensions. I'll try to model it for you using EZNEC. Is this a real project? That is, do you have the antenna, or are you planning to build one? If you have a "store bought" 2 GHz Quad helix, there are certainly some patterns available from the mnanufacturer. If you plan to build the Quad helix, are you able to make any impedance measurements of the model? As you know, the fundamental plan in the Quad Helix design is to make one loop radiate 90 degrees later than the other due to the impedance difference between the two loops. Jerry KD6JDJ Remember that gigahertz-level quad helixes used on satellites are usually multiturn devices. Model results for a 137-MHz, half-turn antenna scaled up to 2 GHz may not be appropriate. ... Rich W2RG Hi Rich Your comment helps. I wasnt aware that multiturn Quad Helix antennas were used on satellites. can you point me to a site where the multiturn Quad Helix is used for satellite application? Thanks Jerry KD6JDJ- Masquer le texte des messages précédents - - Afficher le texte des messages précédents - hi jerry follow this links please : http://www.sstl.org/assets/Downloads...34841105001755 discretman16 * Hi discreteman16 * I couldnt figure out how to see the referenced sites without paying $31.50. *But, that looks like a site where extensive computer modeling has been documented. * It becomes quite obvious that I am at a far too low level in my math and theoritical capability to assist you. * I dont even know what ANSOFT and matlab are. * * But, I use EZNEC to describe Quad Helix antennas of my design. * *It takes me less than 10 minutes to describe a Quad Helix in EZNEC. * I strongly recommend EZNEC to any young person who has *any* interest in designing or understanding antennas. * It is a great tool for anyone who is interested in antennas. * If I can be of any help to you by trying to model a Quad Helix for you, you are welcome to contact me. * * * * * * * * * * * * Jerry * KD6JDJ- Masquer le texte des messages précédents - - Afficher le texte des messages précédents - hi jerry i'm surprised when u tell me that u dont know what's matlab !!!!!!!!!!!!!!, www.mathworks.com i know that the NEC is the most used in antennas modeling, but it takes me several days to learn hiw i use it, if u give some tutorials it will be good, i downloaded the demo version and i found it good and difficul to use!!!!!!!!! thank u |
#8
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hi sos
wrote in message ... On 7 juin, 16:45, "Jerry" wrote: wrote in message ... On 6 juin, 22:15, "Jerry" wrote: "Rich Griffiths" wrote in message xcommunications... snip hi "jerry" i want QHA models and i try to adapt them for 2GHZ it's for heliosynchron satellite for earth sensing thank u Hi "disc" Wow, thats a small Quad Helix. Tell me the dimensions. I'll try to model it for you using EZNEC. Is this a real project? That is, do you have the antenna, or are you planning to build one? If you have a "store bought" 2 GHz Quad helix, there are certainly some patterns available from the mnanufacturer. If you plan to build the Quad helix, are you able to make any impedance measurements of the model? As you know, the fundamental plan in the Quad Helix design is to make one loop radiate 90 degrees later than the other due to the impedance difference between the two loops. Jerry KD6JDJ Remember that gigahertz-level quad helixes used on satellites are usually multiturn devices. Model results for a 137-MHz, half-turn antenna scaled up to 2 GHz may not be appropriate. ... Rich W2RG Hi Rich Your comment helps. I wasnt aware that multiturn Quad Helix antennas were used on satellites. can you point me to a site where the multiturn Quad Helix is used for satellite application? Thanks Jerry KD6JDJ- Masquer le texte des messages précédents - - Afficher le texte des messages précédents - hi jerry follow this links please : http://www.sstl.org/assets/Downloads...34841105001755 discretman16 Hi discreteman16 I couldnt figure out how to see the referenced sites without paying $31.50. But, that looks like a site where extensive computer modeling has been documented. It becomes quite obvious that I am at a far too low level in my math and theoritical capability to assist you. I dont even know what ANSOFT and matlab are. But, I use EZNEC to describe Quad Helix antennas of my design. It takes me less than 10 minutes to describe a Quad Helix in EZNEC. I strongly recommend EZNEC to any young person who has *any* interest in designing or understanding antennas. It is a great tool for anyone who is interested in antennas. If I can be of any help to you by trying to model a Quad Helix for you, you are welcome to contact me. Jerry KD6JDJ- Masquer le texte des messages précédents - - Afficher le texte des messages précédents - hi jerry i'm surprised when u tell me that u dont know what's matlab !!!!!!!!!!!!!!, www.mathworks.com i know that the NEC is the most used in antennas modeling, but it takes me several days to learn hiw i use it, if u give some tutorials it will be good, i downloaded the demo version and i found it good and difficul to use!!!!!!!!! thank u Hi discreteman16 I appreciate the fact that you could be surprized about my ignoirance. But, I am an old "handyman" kind of guy who likes to play with antennas. The last time I worked as an antenna design engineer was in 1969. I'd be happy to assist you with simple antenna modeling with EZNEC. There are very few EZNEC users who know less about antenna modeling than I do. It is my belief that 'if I can learn EZNEC, anyone can'. If you intend to model a Quad Helix with EZNEC, it is necessary to purchase the version that configures a helix with a "stroke of the keyboard". Send me the dimensions and frequency of your Quad Helix and I'll model it for you. I'll try to keep a record of the time required. Jerry KD6JDJ |
#9
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hi sos
On 9 juin, 15:18, "Jerry" wrote:
wrote in message ... On 7 juin, 16:45, "Jerry" wrote: wrote in message .... On 6 juin, 22:15, "Jerry" wrote: "Rich Griffiths" wrote in message xcommunications... snip hi "jerry" i want QHA models and i try to adapt them for 2GHZ it's for heliosynchron satellite for earth sensing thank u Hi "disc" Wow, thats a small Quad Helix. Tell me the dimensions. I'll try to model it for you using EZNEC. Is this a real project? That is, do you have the antenna, or are you planning to build one? If you have a "store bought" 2 GHz Quad helix, there are certainly some patterns available from the mnanufacturer.. If you plan to build the Quad helix, are you able to make any impedance measurements of the model? As you know, the fundamental plan in the Quad Helix design is to make one loop radiate 90 degrees later than the other due to the impedance difference between the two loops. Jerry KD6JDJ Remember that gigahertz-level quad helixes used on satellites are usually multiturn devices. Model results for a 137-MHz, half-turn antenna scaled up to 2 GHz may not be appropriate. ... Rich W2RG Hi Rich Your comment helps. I wasnt aware that multiturn Quad Helix antennas were used on satellites. can you point me to a site where the multiturn Quad Helix is used for satellite application? Thanks Jerry KD6JDJ- Masquer le texte des messages précédents - - Afficher le texte des messages précédents - hi jerry follow this links please : http://www.sstl.org/assets/Downloads...x%20Antenna.pd... discretman16 Hi discreteman16 I couldnt figure out how to see the referenced sites without paying $31.50. But, that looks like a site where extensive computer modeling has been documented. It becomes quite obvious that I am at a far too low level in my math and theoritical capability to assist you. I dont even know what ANSOFT and matlab are. But, I use EZNEC to describe Quad Helix antennas of my design. It takes me less than 10 minutes to describe a Quad Helix in EZNEC. I strongly recommend EZNEC to any young person who has *any* interest in designing or understanding antennas. It is a great tool for anyone who is interested in antennas. If I can be of any help to you by trying to model a Quad Helix for you, you are welcome to contact me. Jerry KD6JDJ- Masquer le texte des messages précédents - - Afficher le texte des messages précédents - hi jerry i'm surprised when u tell me that u dont know what's matlab !!!!!!!!!!!!!!,www.mathworks.com i know that the NEC is the most used in antennas modeling, but it takes me several days to learn hiw i use it, if u give some tutorials it will be good, i downloaded the demo version and i found it good and difficul to use!!!!!!!!! thank u * Hi discreteman16 * I appreciate the fact that you could be surprized about my ignoirance.. But, I am an old "handyman" kind of guy who likes to play with antennas. The last time I worked as an antenna design engineer was in 1969. * I'd be happy to assist you with simple antenna modeling with EZNEC. There are very few EZNEC users who know less about antenna modeling than I do. *It is my belief that 'if I can learn EZNEC, anyone can'. * If you intend to model a Quad Helix with EZNEC, it is necessary to purchase the version that configures a helix with a "stroke of the keyboard". * Send me the dimensions and frequency of your Quad Helix and I'll model it for you. * I'll try to keep a record of the time required. * * * * * * * * * * * * * * * *Jerry * * *KD6JDJ- Masquer le texte des messages précédents - - Afficher le texte des messages précédents - hi jerry frequency = 2025-2110 MHz uplink or 2200 -2290 MHz downlink number of turns = usually 2 radius = 1 to 3 inch good luck for therecord and thank u |
#10
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hi sos
wrote in message ... On 9 juin, 15:18, "Jerry" wrote: wrote in message ... On 7 juin, 16:45, "Jerry" wrote: wrote in message ... On 6 juin, 22:15, "Jerry" wrote: "Rich Griffiths" wrote in message xcommunications... snip hi "jerry" i want QHA models and i try to adapt them for 2GHZ it's for heliosynchron satellite for earth sensing thank u Hi "disc" Wow, thats a small Quad Helix. Tell me the dimensions. I'll try to model it for you using EZNEC. Is this a real project? That is, do you have the antenna, or are you planning to build one? If you have a "store bought" 2 GHz Quad helix, there are certainly some patterns available from the mnanufacturer. If you plan to build the Quad helix, are you able to make any impedance measurements of the model? As you know, the fundamental plan in the Quad Helix design is to make one loop radiate 90 degrees later than the other due to the impedance difference between the two loops. Jerry KD6JDJ Remember that gigahertz-level quad helixes used on satellites are usually multiturn devices. Model results for a 137-MHz, half-turn antenna scaled up to 2 GHz may not be appropriate. ... Rich W2RG Hi Rich Your comment helps. I wasnt aware that multiturn Quad Helix antennas were used on satellites. can you point me to a site where the multiturn Quad Helix is used for satellite application? Thanks Jerry KD6JDJ- Masquer le texte des messages précédents - - Afficher le texte des messages précédents - hi jerry follow this links please : http://www.sstl.org/assets/Downloads...x%20Antenna.pd... discretman16 Hi discreteman16 I couldnt figure out how to see the referenced sites without paying $31.50. But, that looks like a site where extensive computer modeling has been documented. It becomes quite obvious that I am at a far too low level in my math and theoritical capability to assist you. I dont even know what ANSOFT and matlab are. But, I use EZNEC to describe Quad Helix antennas of my design. It takes me less than 10 minutes to describe a Quad Helix in EZNEC. I strongly recommend EZNEC to any young person who has *any* interest in designing or understanding antennas. It is a great tool for anyone who is interested in antennas. If I can be of any help to you by trying to model a Quad Helix for you, you are welcome to contact me. Jerry KD6JDJ- Masquer le texte des messages précédents - - Afficher le texte des messages précédents - hi jerry i'm surprised when u tell me that u dont know what's matlab !!!!!!!!!!!!!!,www.mathworks.com i know that the NEC is the most used in antennas modeling, but it takes me several days to learn hiw i use it, if u give some tutorials it will be good, i downloaded the demo version and i found it good and difficul to use!!!!!!!!! thank u Hi discreteman16 I appreciate the fact that you could be surprized about my ignoirance. But, I am an old "handyman" kind of guy who likes to play with antennas. The last time I worked as an antenna design engineer was in 1969. I'd be happy to assist you with simple antenna modeling with EZNEC. There are very few EZNEC users who know less about antenna modeling than I do. It is my belief that 'if I can learn EZNEC, anyone can'. If you intend to model a Quad Helix with EZNEC, it is necessary to purchase the version that configures a helix with a "stroke of the keyboard". Send me the dimensions and frequency of your Quad Helix and I'll model it for you. I'll try to keep a record of the time required. Jerry KD6JDJ- Masquer le texte des messages précédents - - Afficher le texte des messages précédents - hi jerry frequency = 2025-2110 MHz uplink or 2200 -2290 MHz downlink number of turns = usually 2 radius = 1 to 3 inch good luck for therecord and thank u Hi disc I made a first approximation of a 2.2 GHz Quad Helix. It came out as a 2.274 GHz Quad Helix. It is about 40 mm tall and 20 mm wide. It took me about 45 minutes mainly because I chased a few mistakes. Contact me again via my E-mail for any additional info. Tell me what wire diameter you prefer. I had difficulty trying to open the file you sent. My computer skills are really poor. Jerry |