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Time and Frequency References
rickman wrote:
On 4/18/2016 5:43 PM, David Woolley wrote: On 18/04/16 15:39, rickman wrote: How important are time and frequency references to amateur radio operators? I've been working on a radio controlled clock design that would be capable of generating a 32.768 kHz, 60 kHz, 240 kHz, 1 MHz and 10 MHz frequency references in addition to providing the time and date. Initially it would be capable of receiving the 60 kHz transmissions of WWVB and MSF. With minor tweaks other stations could be received. Would this be useful to others? Anyone who wants high accuracy off air time and frequency standards would use GPS these days. Even that is almost two decade old technology in amateur radio usage: http://www.tapr.org/kits_tac2.html Is there something about GPS that is inherently superior for a frequency reference? For setting a time, GPS can provide a smaller offset, but I don't see where it has any advantages over WWVB or similar station broadcasts where you can receive them. The direct-sight UHF radio link provides less jitter and uncertainty than the VLF signal that suffers from propagation effects. The main limitation of a GPS receiver is the need for an outside antenna for many installations. A WWVB receiver is self contained and much lower cost. Sure it can be easier to place an antenna for a VLF station, but on the other hand there is much more interference, mainly from switchmode powersupplies these days (in the old days it was from CRT computer monitors), but also from lightning. |
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