Field Descriptions For Decoder Modes; The Decoder’s Signal Source; Decoder Frequency Measurements - HP 8920A User Manual

Chapter 8, Signaling Decoder Screen

Field Descriptions for Decoder Modes

Field Descriptions for Decoder Modes
The Decoder's Signal Source

Decoder Frequency Measurements

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The Signaling Decoder analyzes different data-encoded signaling formats. The
format is selected in the
A list of standards for each format is displayed by selecting the
any screen.
Separate screen and field descriptions are given for each screen. The descriptions
are listed in the following order:
• AMPS-TACS/NAMPS-NTACS
• CDCSS (Continuous Digital Controlled Squelch System)
• Digital Paging
• DTMF (Dual-Tone Multi-Frequency) Sequence
• EDACS (Enhanced Digital Access Communications System)
• Function Generator
• LTR (Logic Trunked Radio: Registered Trademark of EF Johnson Company)
• MPT 1327
• NMT (Nordic Mobile Telephone) encoder and decoder
• Tone Sequence
The decoder always gets its signal immediately after the de-emphasis network of
the AF Analyzer. De-emphasis can be turned on or off on the AF ANALYZER
screen, or can be controlled while using the decoder by assigning a global USER
key to the
De-Emphasis
descriptions and functional block diagram in
.
page 99
The decoder uses a different timebase for frequency counting than the AF
Analyzer. Therefore, their measurements may be different when measuring the
same signal (by a very small amount).
field in any of the decoder's screens.
Mode
field. Refer to the AF ANALYZER screen's field
chapter 5, "AF Analyzer Screen," on
field in
Standard