Honeywell International Inc. SCS-1000 External Photos
SECURITY NOTATION
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EB7519386
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5200-032 (REV 960102 BCAS ASF5900/ENG_SPEC.DOT) (REV 08/01/97-LOGISTICS/BCAS) HONEYWELL INC.
ENGINEERING
SPECIFICATION
4.5.7
Transmission Frequency Circuit Diagram and Description
4.5.7.1 Circuit
Diagrams
The circuitry which determines and stabilizes the transmission frequency is contained in the TPU
and the ACU. In the circuitry inside the ACU which assists in this function is the RF Board (RFB).
The schematic diagrams for this circuitry will be provided by OmniPless due to their containing
proprietary information. The electronic files which contain these schematic diagrams are listed
below:
and the ACU. In the circuitry inside the ACU which assists in this function is the RF Board (RFB).
The schematic diagrams for this circuitry will be provided by OmniPless due to their containing
proprietary information. The electronic files which contain these schematic diagrams are listed
below:
TPU Schematic File Name:
1911_QROF2199232_E_P2-3.pdf
RFB Schematic File Name:
1911_QROF2199188_H_P6-7.pdf
4.5.7.2
Circuit Diagram Descriptions
The output frequency is generated by a phase locked loop with a TCXO (Temperature
Compensated Crystal Oscillator) reference. The TX frequency stability and tolerance will be
determined by the quality of the TCXO. The chosen TCXO has +/- 2.5 ppm tolerance over
temperature range –25 to +70 °C. Low aging specification is selected for the TCXO. During a call
the terminal will be synchronized to the LES (Land Earth Station) frequency reference by means of
fine adjustment of the output frequency from the synthesizer.
Compensated Crystal Oscillator) reference. The TX frequency stability and tolerance will be
determined by the quality of the TCXO. The chosen TCXO has +/- 2.5 ppm tolerance over
temperature range –25 to +70 °C. Low aging specification is selected for the TCXO. During a call
the terminal will be synchronized to the LES (Land Earth Station) frequency reference by means of
fine adjustment of the output frequency from the synthesizer.
Due to the nature of the fractional synthesizer realized with sigma / delta high order modulator, sub
hertz frequency raster is obtained together with the possibility to do direct modulation to gain high
quality offset
hertz frequency raster is obtained together with the possibility to do direct modulation to gain high
quality offset
QPSK modulation. The very high phase comparator frequency in this system (MHz range), low
reference spurious is obtained together with very rapid frequency change in agile systems.
Randomization of the fractional part in the divide by N in the PLL has the effect of spreading the
noise far beyond the loop filter cut off frequency thus effectively attenuating the spurious to very low
values.
reference spurious is obtained together with very rapid frequency change in agile systems.
Randomization of the fractional part in the divide by N in the PLL has the effect of spreading the
noise far beyond the loop filter cut off frequency thus effectively attenuating the spurious to very low
values.
Out of band noise and spurious radiation is suppressed by several band pass filters in the
transmitter chain.
transmitter chain.
Output power is limited and controlled as described under Section 4.5.6