IRIG G
IRIG E
NASA-36
Modulation: Changes the type of output signal modulation. The available choices
are:
IRIG DCLS—A TTL-modulated output.
IRIG AM-–An amplitude modulated output. The amplitude of the output is
determined by the value entered in the Amplitude field.
Frequency—The IRIG modulation frequency. This is determined by the con-
figuration of Format and Modulation Type. See also "IRIG Carrier Fre-
quencies" on page546.
Coded Expression: Defines the data structure of the IRIG signal, where:
BCD = Binary Coded Decimal
TOY = Time of Year
CF = Control Field
SBS = Straight Binary Seconds
The available options will vary according to the values of Format and Mod-
ulation Type.
Control Function Field: IRIG signals have an optional section in the data stream
that can be used to include additional information (such as the present year, for
example). This field allows the Control Field section of the IRIG output to be defined.
The available configurations are:
Fields conform to RCC 200-04: IRIG spec 200-04 specified a location for
year value, if included in this field.
Fields conform to IEEC 37.118-2005 (IEEE 1344): Control Field contains
year, leap second and daylight savings time information.
Fields conform to Spectracom Format: Year is included in Control Field but
not in the same location as RCC-2004 output (year is offset by one position).
Fields conform to Spectracom FAA Format: A unique IRIG output Control
Field that contains satellite lock status and time error flags.
Fields conform to NASA Formats: Variants of IRIG B
SecureSync 2400 User Manual 415
APPENDIX
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