By Jacob Z. Schanker
Provides the basics, purposes, procedure layout issues, protocols and destiny traits of this principally untapped communications expertise. The self-prompting courses contain an entire resource code directory and practice computations for: man-made noise point prediction, meteor burst course loss, VHF terrestrial propagation variety, transmission line VSWR and loss, antenna take-off angles, specific time of prevalence of meteor showers and lots more and plenty extra.
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Additional info for Meteor Burst Communications
These areas of maximum usable activity are called hot spots. A variety of antennas may be used with meteor burst systems. Directive arrays such as the Yagi are most frequently used. fective radiated power and the received signal level, improving communication reliability. , illuminating) a common sky area, preferably including hot spots. In certain cases, the gain of the Yagi, which limits the sky area illuminated by the signal, is a disadvantage. If a highly directive antenna pointing directly at the great circle bearing (the axis) -to the other station, the beam may be so narrow as to miss illuminating the "hot spots" of meteor trail activity on either side of the axis.
A reasonable approach might be to start with the median value of noise power for use in the link analysis techniques of Chapter 7. If performance predictions appear favorable, recalculation with more conservative noise estimates incorporating the variability should then be made. The computer program, NOISE, the book's companion software, can be used to obtain the predicted median value of artificial noise at any frequency as well as the expected variations above and below the median. 2 is an example of the use of NOISE to determine expected artificial (man-made) noise levels at a frequency of 40 MHz.
Another advantage is that a single meteor burst operating frequency may be used by many stations, as long as they are sufficiently separated so as not to overlap their individual footprint areas. 2 Survivability-Survivability is another characteristic of meteor burst communication often cited. Although other means of long-range communication may be expected to break down, at least temporarily, in the event of large-scale nuclear warfare, meteor burst is expected to continue to operate. Although the ionosphere can be disrupted by highaltitude nuclear detonations and satellites can be destroyed, meteors will continue to enter the atmosphere producing usable trails.