Here on Kauai, the site of WWVH, a directional array of
vertical 1/2 wave dipoles is used on 5, 10, and 15 MHz to
provide "Skip-Hemispherical" coverage to the West, on out
across the International Date Line from Hawaii. Each
1/2 wave dipole array is fed by a 10 kW transmitter, which
has a "hot" standby beside it in the transmitter/clock building
"just in case". Also, a huge Caterpillar tractor engine is
in the building to drive a gigantic generator, should Kauai
Electric fail to provide the needed input AC power.
Unfortunately, is a Holiday weekend, and cannot reach a tech
or engineer on duty out there today to get any array details;
height of feed-point, method of feed etc. Will see what more
I can learn on Monday, if anything, hi.
To see a photo of the WWVH transmitter building, and just
a peek at the antennas, go to:
http://www.ubr.com/clocks/nist/wwv/wwvh320.jpg
NIST site in Boulder photo:
http://www.ubr.com/clocks/nist/wwv/wwv320.jpg
can see more of the Colorado antenna set up
than in the Kauai photo.
Some info about the WWV/WWVH/ and WWVB signals is at:
http://www.ubr.com/clocks/nist/wwv/wwv.html
Current solar flux, BTW, is 160 at 2000 UTC.
73, Jim, KH7M
--
FAQ on WWW: http://www.contesting.com/towertalkfaq.html
Submissions: towertalk@contesting.com
Administrative requests: towertalk-REQUEST@contesting.com
Problems: owner-towertalk@contesting.com
Search: http://www.contesting.com/km9p/search.htm
|
