Quantum and Evolution Series Installation and Operating Handbook
13-3
13.2 Tx Modulator Specifications
Parameter
Modem
IF Output Power Level
0 to –25dBm continuously variable in 0.1dB steps
L-band Output Power
Level
-5 to –30dBm continuously variable in 0.1dB steps
Output Level Stability
±0.5dB, 0ºC to 50ºC
Transmit Filtering
Intelsat IESS compliant.
α
= 0.35
Occupied Bandwidth
1.2 times Symbol Rate
Recommended Channel
Spacing
1.4 times Symbol Rate
Phase Accuracy
±2º maximum
Amplitude Accuracy
±0.2dB maximum
Carrier Suppression
-30dBc minimum
Output Phase Noise
As IESS-308, nominally 3dB better.
IF Output Frequency
Stability
<1ppm/yr
L-band Output
Frequency Stability
7.5E-8/yr with high stability reference option
IF Harmonics
Better than –55dBc/ 4kHz in band
L-band Harmonics
Better than –55dBc/ 4kHz in band, no worse than
–45dBc out of band to 5GHz
IF Spurious
Better than –55dBc/ 4kHz in band
L-band Spurious
Better than –55dBc/ 4kHz in band, no worse than
–40dBc out of band 10MHz to 5GHz
Transmit On/Off Ratio
55dB minimum
External Transmit Inhibit
By external contact closure or by TTL signal
applied to rear panel Alarms & AGC connector
