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Idu transmit specification, 1 idu transmit specification – Comtech EF Data C5 User Manual

Page 86

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Specifications

C5/K1/K3 Integrated Satellite Terminal System

2–52

Rev. 0

2.7.2.1 IDU

Transmit

Specification

Refer to Table 2-31 for IDU transmit specifications.

Table 2-31. IDU Transmit Specifications

Parameter

Specifications

Output Frequency Range

779 to 801 MHz, in 100 Hz steps

Frequency Stability

% 0.01 ppm

Output Power

-10 dBm (factory calibrated)

Output Impedance

50

! % 10%

Output Return Loss

> 12 dB

Output S/N Ratio

> 50 dB

Output Phase Noise

< -63 dBc/Hz at 100 Hz
< -73 dBc/Hz at 1 kHz
< -83 dBc/Hz at 10 kHz
< -93 dBc/Hz at 100 kHz

Undesired Sideband Suppression

< -30 dBc

Carrier Suppression

< -35 dBc

Spurious

< -50 dBc in any 3 kHz BW

Harmonics

< -45 dBc

Output Off Level

< -50 dBm

ODU Power (from center
conductor of IF Output)

+36 VDC (2.5A maximum),

% 1 VDC

ODU Reference

50 MHz at –3 dBm

ODU M&C Data Link

Half Duplex, ASK Modulated serial digital data with either a 3. 68 MHz

Modulated Output Shaping

EFData Closed, Comstream Closed, Fairchild Closed

Modulation

Coherent QPSK or BPSK

Symbol Rate Range (variable):

4.8 to 2500 ks/s

Data Rate Range (variable):

QPSK
BPSK

4.8 to 4375 kbit/s, in 1.0 bit/s steps
2.4 to 1250 kbit/s, in 1.0 bit/s steps

Forward Error Correction

Viterbi K = 7, 1/2, 3/4, and 7/8 rate
Optional: Sequential K = 36, 1/2, 3/4, 7/8 rate
Optional: Reed-Solomon IESS 308/309 Concatenated 225.205 T = 10

Scrambling

CCITT V.35 IESS modified, CCITT V.35 (EFD or CSC Closed), FDC,
2

15

-1 SYNC

Transmit Frequency Change
Time

< 200 ms

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