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Make your own T2FD
Hello fellow shortwave listeners !
More info to make a T2FD yourself, like I did mine, please have a look at: http://members.home.nl/rita.kees/t2fdmake.html I hope you can appreciate it and use it for your practice. I will be glad to answer your questions. 73/cheers Kees |
Hey Kees; Looks great I live in an apartment; wonder if the people in the next building would mind if I strung one up ; AH ! F**K em! I'll just do it Put a Huge " Bush For President" banner on it.. -& a tinny radio playing "Hail To The Chief 24/7 Yeah !!! Happy DX'ing everyone!! Subject: Make your own T2FD From: Kees Date: 6/20/2004 2:26 PM Eastern Standard Time Message-id: Hello fellow shortwave listeners ! More info to make a T2FD yourself, like I did mine, please have a look at: http://members.home.nl/rita.kees/t2fdmake.html I hope you can appreciate it and use it for your practice. I will be glad to answer your questions. 73/cheers Kees |
Thanks for the Post, Kees;
Dan / NYC In article , Kees writes: Hello fellow shortwave listeners ! More info to make a T2FD yourself, like I did mine, please have a look at: http://members.home.nl/rita.kees/t2fdmake.html I hope you can appreciate it and use it for your practice. I will be glad to answer your questions. 73/cheers Kees |
Kees wrote: Hello fellow shortwave listeners ! More info to make a T2FD yourself, like I did mine, please have a look at: http://members.home.nl/rita.kees/t2fdmake.html I hope you can appreciate it and use it for your practice. I will be glad to answer your questions. 73/cheers Kees I made a nice one up a number of years ago and really wasn't impressed with it. Stuck with the wires. Steve Holland, MI Drake R7, R8 and R8B http://www.iserv.net/~n8kdv/dxpage.htm |
Kees wrote:
Hello fellow shortwave listeners ! More info to make a T2FD yourself, like I did mine, please have a look at: http://members.home.nl/rita.kees/t2fdmake.html I hope you can appreciate it and use it for your practice. I will be glad to answer your questions. 73/cheers Kees http://members.home.nl/rita.kees/t2fd1.gif I found that my garage is WAY to far away to use this setup. Following the formula, I took an average frequency of 10 Megahertz. I divided into 100, as per the formula. I got an antenna length of (100ft/10,000,000) = 1 X 10^-5 feet, or 0.00012 inches. I then thought that this just couldn't be right. I redid it using Meters instead of feet and arrived at 0.00001 meters length. MUCH BETTER! The problem now is that the store only sells full length rolls of wire. Where can I mail order a smaller chunk? Can they just wrap the postage stamp around it to save shipping costs? Being ever on the watch for cheap alternatives, what is a cheap way of relocating the far end antenna support? I don't want to pay to have the garage moved. Any insights appreciated. mike -- __ __ __ __ __ __ __ __ / /\ / /\ / /\ / /\ / /\ / /\ / /\ / / / /\ \/ /\ \/ /\ \/ / /_/ \/_/ \/_/ \/_/ \/_/ \/_/ \/_/ \/_/ ..let the cat out to reply.. ©Densa International 'Think tanks cleaned cheap' |
On Mon, 21 Jun 2004 03:25:46 GMT, m II
wrote: Kees wrote: Hello fellow shortwave listeners ! More info to make a T2FD yourself, like I did mine, please have a look at: http://members.home.nl/rita.kees/t2fdmake.html I hope you can appreciate it and use it for your practice. I will be glad to answer your questions. 73/cheers Kees http://members.home.nl/rita.kees/t2fd1.gif I found that my garage is WAY to far away to use this setup. Following the formula, I took an average frequency of 10 Megahertz. I divided into 100, as per the formula. I got an antenna length of (100ft/10,000,000) = 1 X 10^-5 feet, or 0.00012 inches. I then thought that this just couldn't be right. I redid it using Meters instead of feet and arrived at 0.00001 meters length. MUCH BETTER! The problem now is that the store only sells full length rolls of wire. Where can I mail order a smaller chunk? Can they just wrap the postage stamp around it to save shipping costs? Being ever on the watch for cheap alternatives, what is a cheap way of relocating the far end antenna support? I don't want to pay to have the garage moved. Any insights appreciated. mike In the event that you are not just being sarcastic, here's a link that may help. http://www.hard-core-dx.com/nordicdx.../t2design.html |
"Kees" wrote in message
... Hello fellow shortwave listeners ! More info to make a T2FD yourself, like I did mine, please have a look at: http://members.home.nl/rita.kees/t2fdmake.html I hope you can appreciate it and use it for your practice. I will be glad to answer your questions. 73/cheers Kees The Tilted Terminated Folded Dipole ("T2FD") is a broadband folded dipole antenna design that provides a relatively stable feed point impedance over about a five to one frequency range. The antenna length in meters is approximately 100 divided by the lowest desired operating frequency in megahertz. The upper element of the folded dipole is opened in the center and a non-inductive terminating resistor of around 350-400 ohms is inserted. The bottom element is fed in the center through a 6-to-1 balun for a good match to 50 ohm feed line. The antenna is not as efficient as a matched half wave dipole at any specific frequency, but it also does not require an antenna tuner for operation, making it easy to use. The loss of receiving efficiency is not generally noticeable in the high frequency range (2-30 MHz), amounting to less than 6 db (one standard S-unit) during extensive on-the-air testing. Here is additional information on the T2FD antenna. Barker & Williamson actually applied for a US patent (US Patent #4423423) for their specific T2FD antenna design. http://www.fact-index.com/t/t2/t2fd_antenna.html While this may be acceptable for SWL operation, the resistor does not have sufficient wattage for any station attempting to use this for a transmitting antenna. http://www.tuberadio.com/tfd.html http://www.universal-radio.com/catalog/sw_ant/0562.html w9gb |
Howard wrote:
On Mon, 21 Jun 2004 03:25:46 GMT, m II wrote: Kees wrote: Hello fellow shortwave listeners ! More info to make a T2FD yourself, like I did mine, please have a look at: http://members.home.nl/rita.kees/t2fdmake.html I hope you can appreciate it and use it for your practice. I will be glad to answer your questions. 73/cheers Kees http://members.home.nl/rita.kees/t2fd1.gif I found that my garage is WAY to far away to use this setup. Following the formula, I took an average frequency of 10 Megahertz. I divided into 100, as per the formula. I got an antenna length of (100ft/10,000,000) = 1 X 10^-5 feet, or 0.00012 inches. I then thought that this just couldn't be right. I redid it using Meters instead of feet and arrived at 0.00001 meters length. MUCH BETTER! The problem now is that the store only sells full length rolls of wire. Where can I mail order a smaller chunk? Can they just wrap the postage stamp around it to save shipping costs? Being ever on the watch for cheap alternatives, what is a cheap way of relocating the far end antenna support? I don't want to pay to have the garage moved. Any insights appreciated. mike In the event that you are not just being sarcastic, here's a link that may help. http://www.hard-core-dx.com/nordicdx.../t2design.html Thank you, but now I have to cancel the building movers. mike (Are the numbers REALLY better on this site or is it just a plot by the copper wire conglomerates to sell more product? g). ================================================= 1. The length of each leg ("A'') from the center is equal to 50,000 divided by the lowest desired operating frequency (in kHz) and then multiplied by 3.28. The answer is in feet. 2. The spacing between radiating wires ("B") is equal to 3000 divided by the lowest desired operating frequency (in kHz) and then multiplied by 3.28. The answer is in feet. 3. The sloping angle for a non*directional pattern should be on the order of 30, but 20–40 is acceptable. http://www.hard-core-dx.com/nordicdx.../t2design.html ================================================= -- __ __ __ __ __ __ __ __ / /\ / /\ / /\ / /\ / /\ / /\ / /\ / / / /\ \/ /\ \/ /\ \/ / /_/ \/_/ \/_/ \/_/ \/_/ \/_/ \/_/ \/_/ ..let the cat out to reply.. ©Densa International 'Think tanks cleaned cheap' |
m II wrote:
Kees wrote: Hello fellow shortwave listeners ! More info to make a T2FD yourself, like I did mine, please have a look at: http://members.home.nl/rita.kees/t2fdmake.html I hope you can appreciate it and use it for your practice. I will be glad to answer your questions. 73/cheers Kees http://members.home.nl/rita.kees/t2fd1.gif I found that my garage is WAY to far away to use this setup. Following the formula, I took an average frequency of 10 Megahertz. I divided into 100, as per the formula. I got an antenna length of (100ft/10,000,000) = 1 X 10^-5 feet, or 0.00012 inches. I then thought that this just couldn't be right. I redid it using Meters instead of feet and arrived at 0.00001 meters length. MUCH BETTER! The problem now is that the store only sells full length rolls of wire. Where can I mail order a smaller chunk? Can they just wrap the postage stamp around it to save shipping costs? Being ever on the watch for cheap alternatives, what is a cheap way of relocating the far end antenna support? I don't want to pay to have the garage moved. Any insights appreciated. mike In physics always use meters, kilograms, joules and not inches, pounds or horsepower Hans |
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