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#1
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Antenna info needed
I came across a good 2 meter 12 element beam. The boom is aprox 19 ft
long. It has 4 driven elements in a "log" or lattice configuration. I need info to make the coax connection. Does anyone have an Idea as to Mfg? The driven elements are spaced about 7 inches apart. It is in good shape except for the missing connection points. Thanks, 73's George |
#2
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Antenna info needed
"sangeo" wrote in message ... I came across a good 2 meter 12 element beam. The boom is aprox 19 ft long. It has 4 driven elements in a "log" or lattice configuration. I need info to make the coax connection. Does anyone have an Idea as to Mfg? The driven elements are spaced about 7 inches apart. It is in good shape except for the missing connection points. Thanks, 73's George The manufacturer of your antenna may be KLM (SK). I sniffed this out: http://lists.contesting.com/_towerta.../msg00259.html Some KLM products rolled into M2 Antenna Systems http://www.m2inc.com/index2.html It doesn't look like M2 offers any antennas fed through sleeve baluns or sells any sleeve baluns separately. Also, I have a two 440 beams with the closely spaced "lattice" configuration of multiple driven elements -- as you described. They are fed through quarter sleeve baluns. 16/17 cm long, cut on an angle at the open end, if it matters. One of the baluns still has the mfr sticker on it. Would you believe "KLM"? I could post a picture. From this, I suspect the feed point impedance is close to 50 ohms. I mention impedance only in passing, as I encountered some references to impedance transformation through half-wave sleeve baluns. I haven't investigated that aspect. I googled for "sleeve balun"and at first glance, this looks OK. http://www.vhfman.freeuk.com/radio/sleeve.html Making your own sleeve balun looks easy enough. However, I saw more than the "normal" share of weird s**t on the 'net about making sleeve baluns. Sleeve baluns are good -- don't misunderstand. Just be careful. Read a lot. Multiple toroids slid onto the coax also form a balun. IIRC, advice was posted here recently regarding fifty toroids for HF. Could be that toroids also work well for VHF. Others will know. Good luck and report back. |
#3
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Antenna info needed
Most likely, KLM (formerly owned by Mike Stahl K6MYC , out of business,
last heard) And feed Point is 50 Ohm, Balanced (Unless you also have the 1/4 wave Balun. The Insulators for the elements, are no longer available (I Tried to obtain some several years back), and may be brittle (might want to reinforce them with Epoxy) the feed point of these was at the element closest to the center of the antenna (boom). These, if remember were based on the Oliver Swan Patents (he also used log periodic feed point in his basic antenna, tho think Swan only made them for 6 meters-- as info, Jim NN7k sangeo wrote: I came across a good 2 meter 12 element beam. The boom is aprox 19 ft long. It has 4 driven elements in a "log" or lattice configuration. I need info to make the coax connection. Does anyone have an Idea as to Mfg? The driven elements are spaced about 7 inches apart. It is in good shape except for the missing connection points. Thanks, 73's George |
#4
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Antenna info needed
"sangeo" wrote in message ... I came across a good 2 meter 12 element beam. The boom is aprox 19 ft long. It has 4 driven elements in a "log" or lattice configuration. I need info to make the coax connection. Does anyone have an Idea as to Mfg? The driven elements are spaced about 7 inches apart. It is in good shape except for the missing connection points. Thanks, 73's George I would connect a feedline to the mounting screws of the front most DE and measure the SWR. If you get anything like 4:1 it is 200 Ohms. The KLM 6m beam with 2 driven elements requires a 4:1 balun. I have not seen the KLM 2m. According to an old AES catalog, 2m KLM antennas in this range had boom lengths of 15.33, 21.5, 12.9, 28 , and a circularly polarized 22 element on a 19 foot boom; nothing with 12 elements, but it could be older. Tam/WB2TT |
#5
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Antenna info needed
Tam sez:
"sangeo" wrote in message ... I came across a good 2 meter 12 element beam. The boom is aprox 19 ft long. It has 4 driven elements in a "log" or lattice configuration. I need info to make the coax connection. Does anyone have an Idea as to Mfg? The driven elements are spaced about 7 inches apart. It is in good shape except for the missing connection points. Thanks, 73's George I would connect a feedline to the mounting screws of the front most DE and measure the SWR. If you get anything like 4:1 it is 200 Ohms. The KLM 6m beam with 2 driven elements requires a 4:1 balun. I have not seen the KLM 2m. According to an old AES catalog, 2m KLM antennas in this range had boom lengths of 15.33, 21.5, 12.9, 28 , and a circularly polarized 22 element on a 19 foot boom; nothing with 12 elements, but it could be older. Tam/WB2TT The 2 meter one s I had were 50 ohm (2 meter 14 el) somewhere in this mess I have the "Manual" (more like 3 pages) for it. IF can find , can e-mail. Jim NN7K |
#6
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correction Antenna info needed
Found the Demension sheet (only) Anyone needs, I'll scan and send. Jim
NN7K Jim-NN7K wrote: Tam sez: "sangeo" wrote in message ... I came across a good 2 meter 12 element beam. The boom is aprox 19 ft long. It has 4 driven elements in a "log" or lattice configuration. I need info to make the coax connection. Does anyone have an Idea as to Mfg? The driven elements are spaced about 7 inches apart. It is in good shape except for the missing connection points. Thanks, 73's George I would connect a feedline to the mounting screws of the front most DE and measure the SWR. If you get anything like 4:1 it is 200 Ohms. The KLM 6m beam with 2 driven elements requires a 4:1 balun. I have not seen the KLM 2m. According to an old AES catalog, 2m KLM antennas in this range had boom lengths of 15.33, 21.5, 12.9, 28 , and a circularly polarized 22 element on a 19 foot boom; nothing with 12 elements, but it could be older. Tam/WB2TT The 2 meter one s I had were 50 ohm (2 meter 14 el) somewhere in this mess I have the "Manual" (more like 3 pages) for it. IF can find , can e-mail. Jim NN7K |
#7
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Antenna info needed
On Sep 1, 8:58*pm, Jim-NN7K . wrote:
Tam sez: "sangeo" wrote in message ... I came across a good 2 meter 12 element beam. The boom is aprox 19 ft long. It has 4 driven elements in a "log" or lattice configuration. I need info to make the coax connection. Does anyone have an Idea as to Mfg? *The driven elements are spaced about 7 inches apart. It is in good shape except for the missing connection points. Thanks, 73's George I would connect a feedline to the mounting screws of the front most DE and measure the SWR. If you get anything like 4:1 it is 200 Ohms. The KLM 6m beam with 2 driven elements requires a 4:1 balun. I have not seen the KLM 2m. According to an old AES catalog, 2m KLM antennas in this range had boom lengths of 15.33, 21.5, 12.9, 28 , and a circularly polarized 22 element on a 19 foot boom; nothing with 12 elements, but it could be older. Tam/WB2TT The 2 meter one s I had were 50 ohm (2 meter 14 el) *somewhere in this mess I have the "Manual" *(more like 3 pages) *for it. * IF can find , can e-mail. *Jim NN7K- Hide quoted text - - Show quoted text - Jim, I would appreciate the diagram you have, Any info is good info, Thanks 73's George w2agr |
#8
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Antenna info needed
On Sep 1, 8:58*pm, Jim-NN7K . wrote:
Tam sez: "sangeo" wrote in message ... I came across a good 2 meter 12 element beam. The boom is aprox 19 ft long. It has 4 driven elements in a "log" or lattice configuration. I need info to make the coax connection. Does anyone have an Idea as to Mfg? *The driven elements are spaced about 7 inches apart. It is in good shape except for the missing connection points. Thanks, 73's George I would connect a feedline to the mounting screws of the front most DE and measure the SWR. If you get anything like 4:1 it is 200 Ohms. The KLM 6m beam with 2 driven elements requires a 4:1 balun. I have not seen the KLM 2m. According to an old AES catalog, 2m KLM antennas in this range had boom lengths of 15.33, 21.5, 12.9, 28 , and a circularly polarized 22 element on a 19 foot boom; nothing with 12 elements, but it could be older. Tam/WB2TT The 2 meter one s I had were 50 ohm (2 meter 14 el) *somewhere in this mess I have the "Manual" *(more like 3 pages) *for it. * IF can find , can e-mail. *Jim NN7K- Hide quoted text - - Show quoted text - My email is |
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