Commodore 64 and 128 Programs for Amateur Radio and by Carr J

By Carr J

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Additional resources for Commodore 64 and 128 Programs for Amateur Radio and Electronics

Sample text

When an inductor is used as a shunt component, the smaller the value, the larger the impact. 23 have quite small values. That means both of them move the impedance further. 21. 19, only a p-shape matching circuit can serve the purpose of expanding the antenna bandwidth. s1p]. 24b is the appropriate choice. 56 pF series capacitor. 23. 25 Tolerance analysis (5% of component value) to pay. Because the components used in p-shape matching or a T-shape matching must move the impedance further, they are more sensitive to manufacturing variation.

11. Depending on the different countries, the exact frequency range of each band might vary slightly: . . 11 Band allocation . . 4 GHz band, 2400$2480 MHz. Strictly speaking, using those abbreviations to name bands is not appropriate. Some of them are based on specific technologies. The following are brief introductions; more comprehensive information can be found on their respective websites and in other books [24]. . AMPS is the abbreviation of Advanced Mobile Phone Service. It is an analog standard used by the first cellular communication network.

The other property of a shunt capacitor is that it moves the impedance at the higher frequency band faster than that at the lower band. In this example, the impedances at lower and the higher frequencies are moved around 110 and 200 respectively. It is the first shunt capacitor which tightens up the impedance curve to generate a loop. 22b shows the impedance curve when both C1 and L1 are added. The effect of L1 is quite clear, which is moving the impedance along in a clockwise direction to hit the g ¼ 1 circle.

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