Comtech EF Data SDR-54A - Manual (Page 63)

SDR-54A Satellite Demodulator Revision 4
Specifications MN/SDR54A.IOM
8.1.1 Prime Power Interface
The demodulator will not exceed a total power consumption of 40W. The demodulator
card receives the following prime power supplies:
+5V Supply +5 VDC, ± 5% at 2.0A
+12V Supply +12 VDC, ± 5% at 1.2A
-12V Supply -12 VDC, ± 5% at 0.5A
For rack mount and desktop configurations, the power consumption shall not exceed 40W.
The input will be as follows:
AC 90 to 132 VAC or 175 to 264 VAC,
47 to 63 Hz IEC Connector
DC (Option) 48 or 24 VDC, ± 5% at TBDA 3-position Terminal
block
8.1.2 Desired Carrier Input Power
For symbol rates > 2048 ks/s, the desired carrier input power is –75 to –30 dBm
guaranteed.
• For symbol rates from 64 to 2048 ks/s, the desired carrier input power is –80
to –30 dBm guaranteed.
• For symbol rates < 64 ks/s, the desired inpout power is –80 to –40 dBm
guaranteed.
• For all symbol rates, the typical absolute minimum input is –90 dBm.
8.1.3 Composite to Desired Input Power
The composite to desired ratio is 47 dB with a carrier of 9.6 ks/s wide (-55 dBm maximum
input) and 24 dB with a carrier of 2500 ks/s wide (-32 dBm maximum input).
8.1.4 IF Input Shape
The basic spectral mask is equivalent to a 4-pole Butterworth, and is compatible with the
SDM-51, -52 products. The demodulator is designed such that other spectral shaping is
accommodated with firmware upgrades.
Examples are IESS Open Network and Comtech EF Data Closed Network filtering.
Up to four different filter types are programmed/selected via the M&C interface.
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