Comtech EF Data SNM-1010L - Manual (Page 245)

SNM-1010L Data/Control Modem Revision 0
Specifications
MN/SNM1010L.OM
B.3 Base Modem Specifications
B.3.1 Transmit Frequency (IF)
The range of the TX-IF Frequency is 950 to 1750 MHz, in 100 Hz steps and can
selected by the operator.
B.3.2 Frequency Reference
SCT, RX Bit Clock, and IF output are locked to the Frequency Reference.
Internal (Standard) Stability over the operating temperature range = ± 0.01 ppm.
External Reference
Input (Standard) The External frequency reference connector is located on the back panel.
This allows Frequency Reference to be locked to an external reference
frequency standard.
Impedance 75
Ω
Frequency 1, 5, 10 or 20 MHz
Amplitude ≥ +0 dBm < +20 dBm
DC offset Capacitively coupled
Connector BNC female
Reference
Frequency Output The External frequency reference connector is used as an output. When
selected from the front panel, this output is used to lock other equipment to
the Internal High Stability Reference of the selected modem. The output is
10 MHz, the level is +10 dBm
± 5 dBm.
Calibration Front panel programmable adjustment for aging
B.3.3 Transmit Frequency Change Time
The time between the end of a remote command and the end of the modem reply for
frequency change and synthesizer lock is < 500 ms.
B.3.4 Modulator Phase Noise
1. The phase noise of the TX-IF output carrier is no worse than:
dBc/Hz Distance from Carrier
-66.0 100 Hz
-76.0 1 kHz
-86.0 10 kHz
-96.0 100 kHz
-96.0 1 MHz
2. Fundamental AC line spurious is -42 dBc or lower.
3. The sum of all the single sideband spurious, from 0 to 0.75 x symbol rate, is -42 dBc
or lower.
B–3