Comtech EF Data SNM-1010L - Manual (Page 246)

SNM-1010L Data/Control Modem Revision 0
Specifications MN/SNM1010L.OM
B.3.5 TX-IF Output Switch
When set to Off, no signal present at the output is greater than -60 dBm (< -55 dBc),
measured in a 3 kHz bandwidth from 55 MHz to 2 GHz.
B.3.6 TX-IF Power
The TX-IF power is operator selectable from 0 to -40 dBm, in 0.5 dB steps, with an
accuracy of
± 2.5 dB. The maximum drift due to temperature change over the specified
range is ± 0.5 dB. There is a factory calibration menu to set TX power accurately.
B.3.7 Transmit Power Offset
An offset to the displayed IF output power may be entered from -99.0 to +99.0 dB, in
0.1 dB steps.
B.3.8 Modulated IF Output Shape
The modem meets the following transmit output spectral mask specifications. The
desired mask is selectable from the front panel or remotely.
• INTELSAT/EUTELSAT
• Closed net (Comtech EF Data Closed)
• Closed net (Comstream Closed)
• Closed net (Fairchild compatible)
B.3.9 Spurious Emissions
Spurious emissions are measured relative to the power of an un-modulated carrier. The
measurement is done with the carrier on in continuous mode and modulated by the
correct data/clock signal. Spurious emissions measured in a 4 kHz bandwidth at the
TX-IF output is –55 dBc from 55 MHz to 2 GHz.
B.3.10 Inmarsat Spurious Emissions
When operated over the Inmarsat frequency range of 1626 to 1660 MHz the spurious
emissions in a range from 1610 to 1680 MHz are -60 dBc or less.
Note: This may require operation at a lower transmit power level. Outside of 1610 to
1680 MHz the requirements are the same as the L-Band Spurious Emissions
requirement.
B–4