Allied Radio Knight-Kit Crystal Set 83 Y 261 매뉴얼 - 페이지 6
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페이지 인쇄INSTALLING AN ANTENNA AND GROUND
A good antenna and ground are required to obtain maxi- mum performance and most enjoyment from
your Crystal Set. A typical antenna and ground installation is shown in Figure 3. Bear in mind that this is
only a typical installation, and can be revised to suit your particular requirements. The antenna shou1d
be installed as high as possible; a minimum of 20 to 30 feet is usually satisfactory. An antenna length of
50 feet will norma1l provide good reception in most areas. However, If you live in a rural area, which is
located a considerable distance from the nearest broadcasting station, the antenna should be increased to
75 feet or more in length. Use insulators at each end of the antenna. It is also advisable to use an insulated
lead-in wire. Try to prevent the lead-in from touching trees, buildings, or rain gutters. Such contacts
cause signal leakage and result in reduced volume.
A good ground can usually be obtained by attaching a wire to a cold water pipe, a radiator. or a 6 to 8
foot pipe driven into moist ground. To insure a good connection, scrape or sandpaper the pipe.
It is advisable that you use a lightning arrester as shown by the dotted lines in Figure 3. Connect the lead
from your antenna to one terminal of the arrester. Connect the other terminal to a rod driven into the
ground. If you ground both the lightning arrester and your Crystal Set to the ground rod, use a separate
lead for each. Now, bring the antenna connection to your Crystal Set antenna clip.