Qst
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In our eReader you can find the full English version of the book. Read Qst Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book Qst
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would be only about 2 Mc, and perhaps 12 Mc. or so at 420 Mc. These values are too low for full band coverage, so the design would have to be for the parts of these bands which are of primary interest. The bandwidth is ample for the 144^ and 220-Mc. bands with design centers at 146 and 222.5 Mc.
A close-spaced director, whether used with one or two driven elements, detunes the driven elements and all elements have to be made a little longer than expected. For example, a direc- tor in this desig...n is 39 inches long for the 2-meter band, and 253 2 inches long for the 220-Mc. band.
Fortunately, the driven elements can be tuned to resonance by a short stub, and the main trans- mission line tapped across this stub at the proper point for impedance matching. There is, there- fore, no critical length for the driven elements in April 1955 such a system. Where two such 3-elenieiit bays are used a single stub can l)o used to resonate the entire system.
In curtain array's or with Yagis spaced a half wavelength apart, there is a bucking action of directors of one bay upon those of the other.
What to read after Qst?
You can find similar books in the "Read Also" column, or choose other free books by American Radio Relay League to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
would be only about 2 Mc, and perhaps 12 Mc. or so at 420 Mc. These values are too low for full band coverage, so the design would have to be for the parts of these bands which are of primary interest. The bandwidth is ample for the 144^ and 220-Mc. bands with design centers at 146 and 222.5 Mc.
A close-spaced director, whether used with one or two driven elements, detunes the driven elements and all elements have to be made a little longer than expected. For example, a direc- tor in this desig...n is 39 inches long for the 2-meter band, and 253 2 inches long for the 220-Mc. band.
Fortunately, the driven elements can be tuned to resonance by a short stub, and the main trans- mission line tapped across this stub at the proper point for impedance matching. There is, there- fore, no critical length for the driven elements in April 1955 such a system. Where two such 3-elenieiit bays are used a single stub can l)o used to resonate the entire system.
In curtain array's or with Yagis spaced a half wavelength apart, there is a bucking action of directors of one bay upon those of the other.
What to read after Qst?
You can find similar books in the "Read Also" column, or choose other free books by American Radio Relay League to read onlineMoreLess
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