CP60 and CP60 Plus Service Manual
2-37
Type-B Card Modulation
A Type-B card uses a combination of amplitude modulation and phase
modulation, called Binary Phase Shift Keying (BPSK). This method sends a
constant subcarrier frequency of 847 kHz using amplitude modulation, but shifts
the phase of the subcarrier by 180 degrees (inverted) at each data transition. In
other words, the carrier is always modulated with the subcarrier, but during data
transitions, the subcarrier signal is altered (inverted). The subcarrier is permitted
to invert only at its own transition points (which is why the frequencies are even
multiples of each other).
Summary of Contents for CP60
Page 1: ...Datacard CP60 and CP60 Plus Card Printers Service Manual May 2007 Part No 539358 002 Rev C ...
Page 12: ...1 4 Introduction ...
Page 14: ...2 2 Theory of Operation Printer Components Functional Block Diagram ...
Page 19: ...CP60 and CP60 Plus Service Manual 2 7 LCD Menu Diagram ...
Page 50: ...2 38 Theory of Operation ...
Page 124: ...5 40 Adjustments ...
Page 128: ...6 4 Removal and Replacement Front Wire Routing ...
Page 129: ...CP60 and CP60 Plus Service Manual 6 5 Duplex and Printhead Wire Routing ...
Page 130: ...6 6 Removal and Replacement Functional Block Diagram ...