MAY - WTFDA.org
MAY - WTFDA.org
MAY - WTFDA.org
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Returning to Kaitaia and TV3: it should not surprise you to learn those viewers who happen<br />
to live within the well defined reception enjoy TV3 reception with nothing more complicated than<br />
their normal channel 6 and 8 antenna installed for TVs 1 and 2. This in spite of the fact that TV 1<br />
and 2 arrive over a path less than 25 kilometres long while TV3 arrives over a path averaging 118<br />
kilometres in length.<br />
Reception zone. The placement of the intervening peak(s), the shape of the peaks<br />
(whether blunt-edged , or irregular in shape) and the location ot the intervening knife-edge peak<br />
along the path (ie., whether precisely halfway along the path, or closer to one end than the other)<br />
all profoundly effect the size of the reception zone. Some zones are less than a few metres square<br />
while others may be several miles across. Your challenge, as an installer, is to first suspect such a<br />
knife-edge zone might exist, calculate where it might be (first done in the comfort of your office<br />
using Survey & Land Maps), and then finally going into the field with an antenna and field strength<br />
meter to devine the signal. Illustrations of good and bad ridge-crossing 'angles' appear on page 21<br />
using Kaitaia as an example.<br />
(To Be Continued)<br />
MORE OFF-AIR PHOTOS SENT IN BY JESUS PEREZ IN HAVANA, CUBA<br />
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