| Home |
| Search |
| Today's Posts |
|
#10
October 27th 14, 12:37 AM
posted to rec.radio.amateur.antenna
|
|||
|
|||
Myths and Legends of Antennae
Lostgallifreyan wrote:
wrote in : The rhombic was a big deal in it's day back when huge, empty areas were readily available and better antennas had not yet been invented. I like apples and strawberries, but I'll not go into it.  I had a very quick look at log-periodic antennas before I sleep. That looks like a much more practical notion to me. I guess practical DIY might still be limited to shorter wavelengths, but it looks like a neat, compact and solid antenna design, ideally suited to anyone with some accurate tooling and a need for directivity combined with a relatively broad bandwith reducing need for adjustments. Would it be a contender against a tuned magnetic loop for a beginner's experiment? Like all things in life it is a trade off of various things. The accuracy requirement, at HF anyway, is not that bad and there are LOTS of plans for DIY log periodic antennas out there. Upside: Basically frequency independant (over a range), all metal construction, can directly match 50 Ohms, and gain can be increased by increasing the number of elements and making it longer. Downside: A high gain antenna can be quite large, require a lot of expensive aluminum, be quite heavy and like any beam needs a tower and a rotor. Since it is truely frequency independant, for certain uses, like military that could be operating on any frequency, it is an almost ideal solution. For hams that are constrained to bands, something like a hex beam might be a more economical solution. Your call. -- Jim Pennino |
| Thread Tools | Search this Thread |
| Display Modes | |
|
|
Similar Threads
|
||||
| Thread | Forum | |||
| The inefficiency of short antennae compared to long antennae, as previously discussed. | Antenna | |||
| Minimum Wage Myths? Typical Media Misinformation? | Shortwave | |||
| Welcome to Legends 1680AM Radio | Shortwave | |||
| Reality, "Slippery Facts, and Myths | Policy | |||
| Jon Cunningham reposts old urban legends | Shortwave | |||
Threaded Mode
