Barometric pressure and QSO. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Barometric pressure and QSO. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / radio reception

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In this note, I want to share my observations on the dependence of shortwave communication on barometric pressure.

At low barometric pressure, communication was successful over longer distances than at high pressure.

At close distances, up to 300 km, the audibility greatly increases at a pressure above 780 mm and the transmitter power could be reduced to 0,5 watts, without prejudice to the QRK, while at a distance of over 300-400 km with a power of 35 watts, the QRK was no higher R-3.

At pressures below 780-770 mm, the phenomenon was completely opposite. At a distance of up to 300-400 km, the audibility was no higher than R3-2 and completely disappeared with a decrease in power, while at a distance of more than 400-300 km the audibility was not lower than R7-8 and it was possible to lower the power from 15 watts to 0,5-0,3 .XNUMX watts, without loss of audibility. Good dx QSOs only work at low pressure, and in most cases only at a point where the pressure is also low.

All experiments were carried out with a Hartley transmitter, the power of which could vary from 0,3 to 15 watts. Observations were made from 18:24 to XNUMX:XNUMX Moscow time.

Author: A.Kovalev

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