Российский УКВ портал
You have downloaded this file 0 times in the last 24 hours, limit is 5.
Your file downloads total 0 in the last 24 hours, limit is 5.

VE7BQH Antenna Tables.zip Скачать

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
Дмитрий RA3AQ (RA3AQ)
28 Ноябрь 2018
207.25 Kb
Nov 27, 2018
Lionel H. Edwards, VE7BQH
28 Ноябрь 2018
Всего голосов:13
ttersonjule 2016-04-24 01:28:15 spyder jacket outlet spyder jacket outlet spyder jacket on sale spyder jacket outlet spyder jacket outlet spyder jacket on sale spyder alpine insulated jackets men yellow spyder alpine insulated jackets online sale outlet blog outlet About blog