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There has been a substantial change to the Tables this month. Tsky
and Tearth is now Interactive or changeable by the user.

I would like to thank Vladimir, UR5EAZ for coming up with the idea
and developing the actual EXCEL. Well done!

The original Tsky and Tearth were developed in 1996. Since then as we
all are aware there has been a notable increase in noise on these
bands due to a wide range of man made devices. As an example several
measurements taken in Urban areas show that it is no longer possible
to see 200K cold sky especially with up to 4 yagis arrays. The
biggest increase has been in ground noise. As an example of some
Urban measurements on 144 MHz, The best Tsky seen was 290K and the
Tearth was 4000K. In some cases 5000K.

The impact of using 290K and 4000K in the 144 MHz Table means
antennas with low noise characteristics start to stand out over an
average antenna.

Stations can now determine their own Tsky and Tearth characteristics,
plug in the numbers and better evaluate the performance of their antenna.

Lionel, VE7BQH
Загружено:
Дмитрий RA3AQ (RA3AQ)
Добавлено:
11 Jun 2017
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Автор:
Lionel H. Edwards, VE7BQH
Дата:
11 Jun 2017
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