HP 8920A - CDCSS Data Stream Bit Assignments; The CDCSS Data Stream; Using the CDCSS Encoder

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S:\HP892XX\USRGUIDE\manual\encoscrn.fb
Chapter 10, Signaling Encoder (AF Generator 2)
Using the CDCSS Encoder
Using the CDCSS Encoder
The CDCSS Data Stream
Figure 93 CDCSS Data Stream Bit Assignments
The CDCSS encoder creates a 23-bit digital data stream and Turn Off Code
(TOC). The data stream consists of three parts:
• A 3-digit (9 bit) octal code you supply that corresponds to your radios digital squelch
code number.
• A fixed octal 4 (coded 100).
• A mathematically-derived 11-bit error detection code.
The data stream is output serially, beginning with the error detection code.
The Turn-Off Code
The turn-off code is a tone burst that is output after the data stream has been
output the desired number of times, or after a series of bursts has been interrupted
using the
Stop field.
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