Encyclopedia of radio electronics and electrical engineering / radio reception

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Intrigued by the report RK-1152 ("Radio Vsem" No. 8, 1929) on the relationship between reception quality and atmospheric pressure, I decided to conduct a longer experiment in this direction. Three weeks of regular observations brilliantly confirmed RK-1152. With amazing accuracy, audibility follows changes in pressure. If the pressure drops from the morning of the massacre, then by the evening we can certainly expect magnificent "radio weather". If the pressure slowly changes over several days, the audibility also gradually changes. Only in very rare cases does a drop in pressure cause hearing impairment, and an increase in pressure an improvement. This happens with slight temporal changes in pressure, and the fluctuation in audibility is not strong. In the case of a change in pressure that is regular, uniform, from day to day for several days (which is not a rare phenomenon in the Moscow region), the quality of reception will certainly change in the opposite direction, i.e. with an increase in pressure, the quality of reception decreases and, conversely, as the pressure decreases, the reception quality improves.

Observations were made at waves from 20 to 35 meters.

Along with the presentation of my observations, I want to bring to the discussion of radio amateurs a new way to determine the quality of reception.

The usual way of determining, based on the subjective personal assessment of the operator, suffers from a very large inaccuracy. It is difficult, for example, to find the boundary between "good" and "average" audibility. Each amateur will determine the reception of this day in his own way. For one, the reception will be defined as good, for another it may be as average or very good. It all depends on the individual qualities of each operator.

I suggest the following more accurate way. The quality of the reception is the better, the louder the audibility of each received amateur and the more of them received per evening. That is

K = n*S/t (1)

where K is the reception quality, n is the number of received amateurs, S is the average audibility, and t is the duration of the reception.

The average audibility will be determined as the arithmetic average of the audible individual amateurs (determined by a 9-point system).

S = (S₁+S₂+S₃+S₄+...+S_n)/not

substituting this expression into formula (1) we find

K = n*(S₁+S₂+S₃+S₄+...+S_n)/(t*n) = (S₁+S₂+S₃+S₄+...+S_n)/t

we obtain a very simple formula (see below). S₁, S₂, S₃ etc. are expressed on the R scale (for example, for R-5 S=5, for R-3 S=3); t is expressed in hours.

The formula gives the more correct result, the longer the listening time. Be sure to record all audible transmissions. Even if we can't determine who exactly is working, it's only important to record the audibility. The more accurately and attentively we write it down, the more accurately we will get the result.

Example: taken for 3 hours 30 minutes. 10 amateurs with hearing 5 on R-4, 2 on R-5, 2 on R-2 and 1 on R-1.

Substitute in the formula

K = (S₁ + S₂+...+S_n)/t

K = (4*5 + 5*2 + 2*2+1)/3.5 =35/3.5 = 10

The reception quality on that day will be 10.

Having determined the quality of reception for each day, we can build a curve that will show the change in the quality of reception.

It would be interesting if the GMs leading the reception log would determine the quality of reception for each day using this formula and compare the resulting curve with the curve obtained in the usual way.

Author: RK-629

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