Tom W8JI wrote: > If dominant noise comes from a null direction, the difference between gain > in the desired signal direction to null of the noise will set the > performance. For example, with a thunderstorm off the rear, F/R is most > important. > > If noise is unevenly distributed, then it becomes very complex. > > Most people out in a rural area are probably in a situation where whatever > QRM or noise bothers them, comes from random, differing, directions. Some > people in congested areas have significant noise from one direction, and > they need a deeper null in that specific direction. Going for > exceptionally > high F/R is meaningless unless there is somewhat-consistent strong QRM > from > the rear.
This is why anecdotal reports of great receiving antennas should be taken with a grain of salt. If the user had a dominant noise source in one direction, a receiving antenna with modest RDF, but with a null in the direction of the noise could work miracles. Of course, that same antenna in other locations might not do anything special. Rick N6RK _______________________________________________ Topband reflector - [email protected]
