Arm Meas; Code (Oct); Data (Bin); Data Rate - HP 8920A User Manual
Rf communications test set
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Also See for 8920A:
- Application handbook (322 pages) ,
- Application handbook (319 pages) ,
- Programmer's manual (607 pages)
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Arm Meas
Code (oct)
Data (bin)
Data Rate
Arm measurement prepares the decoder to be triggered by an incoming signal
when
is selected.
Single
This field displays all of the code word combinations from the received data
stream.
The top entry in this column is always 1 of the 83 standard (primary) industry
codes or
(No Primary Code). All other possible code combinations are listed
NPC
in numerical order after this entry.
If a Turn-Off Code (TOC) is measured for a full sampling period,
displayed with no other codes listed.
This measurement field displays a 23-bit segment of the data stream being
received.
After 23 bits have been received, the decoder shifts the bit sequence 23 times until
all possible bit patterns have been analyzed. Any possible code words are
displayed in the
Codes (oct)
field will still display the bit sequence that was received.
Operating Considerations
This field is blank if the only signal received during the decoder's latest sampling
period is a turn-off-code.
The final bit pattern displayed will not necessarily match any of the displayed
codes, since the bits are shifted 23 times during decoding.
This measurement field displays the data rate in bits-per-second for the data
stream being received.
Operating Considerations
For accurate measurements, the
to the expected data rate for the signal being analyzed by the CDCSS decoder.
Chapter 8, Signaling Decoder Screen
Continuous Digital Controlled Squelch System Decoder
column. Even if no code words are found, this
for the CDCSS encoder should be set
Data Rate
is
TOC
281
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