Datum Systems PSM-4900 70Mhz IF Band satellite modem
Specifications
| All Returns Accepted | ReturnsNotAccepted |
| Model | 4900 |
| Type | Satellite Modem |
| Brand | Datum Systems |
Datum Systems PSM 4900 70MHz satellite modem serial number 5200. Additional modem serial # 10032, 10033, 4184, 7702, 7676, 3758, 9015, 4296 (not pictured in listing) IF OUTPUT Output Frequency Range : IF 50.000 to 90.000 MHz. Tuning Method: Via internal synthesizer. Output Level Control: Programmable in 0.1 dB steps over 40 dB from +5 to -35 dBm, +3 dBm max at 50Ω standard unit Output Level Accuracy/Stability: ± 0.5 dB over 0 - 50°C @ any level or frequency ± 0.25 dB over any 10°C range. Output Impedance: Programmable 50 or 75Ω. Output Return Loss: 20 dB minimum Output Burst Control: Contact factory for burst definition and capability. Output Burst Off Isolation >60 dB Modulation Technique: BPSK or QPSK Selectable. Spectral Density: The modulated band shall be -3 dB at the Nyquist frequency of the symbol rate, then approximating an n=8 Butterworth filter response. Spurious Output: < -50 dBc from 2 to 200 MHz. Harmonic Output: < -50 dBc. Phase Balance: < 1 degree. Transmit Synthesizer Tuning Step Size: 1 Hz steps. Frequency Stability: ± 2.0 ppm. (176 Hz max) internal reference Aging: ±1 ppm per year using internal reference. Phase Noise: <-87dBc @1kHz. <-93dBc @10kHz. <-108dBc @100kHz. Synthesizer Control: Via Front Panel and serial control port. Transition Time: +/-400 ppm. Data Rate Change Settling Time: < 100 mSeconds. Baseband Filter: Digital, n=6 Butterworth filter response. Viterbi Forward Error Correction (FEC): Viterbi convolutional decoder, k=7, Rate 1/2. G0 code = 171 octal, G1 code = 133 octal. Rate 3/4 or 7/8 using punctured code Rate 1/2 Coding Gain of 5.2 dB @ BER of 10-5 Rate 1/2 Coding Gain of 5.6 dB @ BER of 10-7 Turbo Product Codes FEC: TPC Block decoder Rate 1/2 Coding Gain of 8.1 dB @ BER of 10-5 Rate 1/2 Coding Gain of 8.7 dB @ BER of 10-7 BER vs. Eb/No Performance: 0.2 dB typical over theoretical. 0.4 dB maximum. Differential Decoding: Selectable On or Off. Descrambler: IESS 308 or 309, Intelsat and V.35 selectable with enable @ Front Panel and via serial control port. IBS, Reed-Solomon and TPC specific modes are available when these options are installed. Receive Data FIFO Buffering 4 bits to 131,070 bits, programmable in 1 bit Plesiochronous or Doppler increments or in time increments. The buffer is a Elastic Store 262,140 bit (maximum) self centering FIFO. Over or under-flow result in re-centering. When set to even multiples of the number of frame bits the re-centering minimizes frame disruption. Buffer Output Clock Options a. Receive Clock (disables buffer) b. Modulator Clock c. Internal Clock. Same rate as receive data rate clock setting, but accurate to 2 PPT at rate 1/2, or 4 PPT, rate 3/4 or 7/8, relative to either internal or external reference clock as selected. d. External Clock, input on data interface.Electrical Power Requirements: Prime Power: 90 to 260 Vac, 47-63 Hz, 50 Watts maximum