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| | English Longwave (via CobWeb/3.1 planetlab2.cs.unc.edu) (Site not responding. Last check: 2007-08-20) |
 | | Since these frequencies propagate by ground wave only, the precision of time signals is not affected by varying propagation paths between the transmitter, the ionosphere, and the receiver. |
 | | In the United States, such devices became feasible for the mass market only after the output power of WWVB was increased in 1997 and 1999. |
 | | Antennas used at these frequencies are usually mast radiators are used as antennas, which are fed at the bottom and which are insulated from ground, or mast antennas fed by the guy ropes (such masts are usually grounded), T-aerials, L-aerials and long wire aerials. |
| articles.gourt.com.cob-web.org:8888 /?article=longwave (1462 words) |
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