A2537-002/01 February 2020 6-24 SEMCO Proprietary Information
Figure 6-37 shows the Encapsulation Structure that is used for DQM.
Figure 6-34
Encapsulation Structure
Referring to Figure 6-34, the following definitions are provided:
A. SYNC PATTERN - A 16-bit word set to 0xFAC4 and is MSB first: 1111101011000100-bit reserve word
must be 0.
B. RSV - Is a 12-bit word that is reserved and is required to be set to all zeros based on the IRIG 106-17
Standard, Chapter 2, Appendix 2-G.
C. VER - 4-Bit Version Number that is set to 0 to signify compliance with IRIG 106-17.
D. DQM - The 16-bit calculated Data Quality Metric as defined above.
E. PAYLOAD - 1024 to 16384 Bits of received data.
The RC100C-2 SEGR DQM setup, as described in subsequent paragraphs, addresses the following
parameters:
A. Enable - Setting this control enables the operation of DQM/DQE. Operation is only valid in PCM/FM,
SOQPSK and Multi-h CPM demodulation formats.
B. Payload Length (Frame Size) - Allows the user to specify the number of received data bits in a DQE
frame. The DQM is calculated over these bits. The valid range is 1024 to 16384 bits, and the mission
Frame Size value using DQM will be known by the user.
C. Frame Word - A combination of the RSV & VER parameters of the DQE frame, the Frame Word is
set as a hexadecimal value. Controls are provided to support any changes in the IRIG Standard and
for test purposes. It should always remain set to 0x0000h (0 setting) unless for special testing.
Manual Mean and BEP Offset are factory-set values that are locked out in normal DQM operation.
Figure 6-35 shows how to enable the DQM feature using the Front Panel LCDs and Keypad.
For DQM ON/OFF, the operator pushes the DEMOD button to enable the <Ch1> Demod Menu display,
uses the UP (2) and DOWN (8) arrows to scroll to DQM Mode in blue, and then pushes ENTER or SELECT
(5) to highlight the ON/OFF window in bright magenta. The operator then uses the UP (2) and DOWN
(8) arrows to select ON and pushes ENTER or SELECT (5.
Using the horizontal LEFT (4) and RIGHT (6) arrows, the operator selects <Ch2> and pushes ENTER or
SELECT (5) to highlight the ON/OFF window in bright magenta. The operator then uses the UP (2) and
DOWN (8) arrows to select ON and pushes ENTER or SELECT (5). The operator repeats these steps for
<Comb>.
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