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#1
May 11th 04, 12:25 PM
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HF VHF UHF LOG PERIODIC 20 TO 1.2 GHZ
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#2
May 11th 04, 04:09 PM
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SEE THIS ON EBAY
http://cgi.ebay.com/ws/eBayISAPI.dll...tem=2244030632 Nice! What is the feedline coax and how old is it? 73, Chip N1IR |
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#3
May 17th 04, 05:14 AM
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Maybe once you have sold it you might be willing to post the plans for the
antenna?? Sorry I am unable to bid on it, cost for shipping is too high. Kevin ZL1UDD "Fumper" wrote in message ... SEE THIS ON EBAY http://cgi.ebay.com/ws/eBayISAPI.dll...tem=2244030632 |
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#4
May 17th 04, 09:12 PM
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Must be interesting as the rear elements start approaching
odd-multiples of the wavelength of the operating frequency.. "Kevin & Natalia Mitchell" wrote in message ... Maybe once you have sold it you might be willing to post the plans for the antenna?? Sorry I am unable to bid on it, cost for shipping is too high. Kevin ZL1UDD "Fumper" wrote in message ... SEE THIS ON EBAY http://cgi.ebay.com/ws/eBayISAPI.dll...tem=2244030632 |
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#5
May 17th 04, 10:01 PM
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Must be interesting as the rear elements start approaching
odd-multiples of the wavelength of the operating frequency.. Many ways to deal with this. Shorting is one. 73, Chip N1IR |
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#6
May 18th 04, 12:19 AM
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Uncle Peter wrote:
Must be interesting as the rear elements start approaching odd-multiples of the wavelength of the operating frequency.. LPs don't care!! They are a driven array and fed from the shortest wavelength. So, as the active region becomes resonant the RF Power is radiated by the active region. The portion of the energy that 'sneaks by' the active region is negligible. Check the Tennadyne site: http://www.tennadyne.com and the ARRL Antenna Handbook. |
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#7
May 18th 04, 01:44 AM
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LPs don't care!!
They are a driven array and fed from the shortest wavelength. So, as the active region becomes resonant the RF Power is radiated by the active region. The portion of the energy that 'sneaks by' the active region is negligible. Check the Tennadyne site: http://www.tennadyne.com and the ARRL Antenna Handbook. Actually Dave, it is a problem in some LPDA's:-). The self scaling of the active region can degrade without a fix on some designs. Most commercial LPDA's, such as the itty bitty WLAN LPDA's, have an inductive via as a short to stop the back-resonance. I'm sure they talk about this in one of the Antenna Compendiums. I can recall the discussion but not the volume. 73, Chip N1IR |
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