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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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HCS301-I/P датащи(PDF) 12 Page - Microchip Technology |
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HCS301-I/P датащи(HTML) 12 Page - Microchip Technology |
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12 / 30 page  HCS301 DS21143B-page 12 © 2001 Microchip Technology Inc. 5.7 Blank Alternate Code Word Federal Communications Commission (FCC) part 15 rules specify the limits on worst case average funda- mental power and harmonics that can be transmitted in a 100 ms window. For FCC approval purposes, it may therefore be advantageous to minimize the transmis- sion duty cycle. This can be achieved by minimizing the duty cycle of the individual bits as well as by blanking out consecutive code words. Blank Alternate Code Word (BACW) may be used to reduce the average power of a transmission by transmitting only every sec- ond code word (Figure 5-1). This is a selectable feature that is determined in conjunction with the baud rate selection bit BSL0. Enabling the BACW option may likewise allow the user to transmit a higher amplitude transmission as the time averaged power is reduced. BACW effectively halves the RF on time for a given transmission so the RF out- put power could theoretically be doubled while main- taining the same time averaged output power. FIGURE 5-1: BLANK ALTERNATE CODE WORD (BACW) Code Word BACW Disabled (All words transmitted) BACW Enabled (1 out of 2 transmitted) BACW Enabled (1 out of 4 transmitted) A 2A 4A Amplitude Time Code Word Code Word Code Word |
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