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On Mar 15, 11:31 am, "Dave" wrote:
"Art Unwin" wrote in message ... On Mar 8, 11:21 am, (Richard Harrison) wrote: Art wrote: "---my antenna is a full wavelength which meets Maxwell`s requirements, it is just that the volume is small despite the wavelength." In 1949, I worked at the KPRC-KXYZ broadcast plant. Another operator there, J.L. Davis, W5LIT had a new 1949 Ford in which he installed a surplus ART-13 and a PE-103 dynamotor. For an antenna he wound wire turn by turn on a bamboo pole until it was resonant on a slice of the 75-meter band. When J.L. modulated, Q in the coil produced a tip corona on the first good peak and modulation became loud without a receiver. The 20th edition of the ARRL Antenna Book on page 16-13 says this about continuously loaded antennas: "The general approach has been to use a coil made from heavy wire (#14 or larger), with length-to-diameter ratios as high as 21. British experimeters have reported good results with 8-foot overall length on the 1.8- and 3.5 MHz bands. The idea of making the entire antenna out of one section of coil has been tried with some success." Art`s antenna containing a "full wavelength" of wire would likely feature a greater loss than J.L.`s 1/4-wave resonant coil from simply a greater length of wire while both have peactances balanced to zero. Art`s lower Q would probably kill the corona, increase the bandwidth, while losing the gain that a fullwave straight conductor enjoys. Cecil can probably report on results of continuously loaded mobile antennas versus a bug catcher loaded whip in the California shoot-outs. Best regards, Richard Harrison, KB5WZI Considering that it meets Maxwells requirements and is at least a wavelenght of a radiator my expectations are much higher than yours I suspect that the output will exceed that of a 160 M antenna which has a ground plane. I also suspect that if I diddn't concentrated so much on small physical size it could easily be uprated to compete with a yagi! I would anticipate that in a couple of years the top band will have twice as many users that it has now. I am hoping also that its small size will allow for receiving abililities in line with the angle of incoming radiation via its manouvarability. Of course if all is already known about radio this would seem impossible but in a few weeks I myself will have a few QSOs to see how it matches up to my expectations. The archives show all the building instruction but it appears that readers have concentrated on nonsensical retorts without reading the content. If an antenna is at least off one wavelength and is in equilibrium I see no reason why it should not beat existing antennas with ground plane losses regardless of its shape or size. Time will tell. Either way the experimental trail undertaken I have found to be very rewarding as many other amateurs have had when experimenting with antennas and who refuse to accept that all is known Art of course all is known, we have been trying to tell YOU that but you won't believe it and insist on trying things that are known NOT to work. you will learn, it will be a long and hard experience from what we have heard from you on here, but you will learn someday that there ain't no such thing as a free lunch when it comes to antennas. Nothing free....I have done a lot of work. Now I get the benefits of that work. I disagree that all experiments on antennas should stop based on the proweress of your particular brain. You have consistently over estimate your abilities |
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