AMT-70/AMT-73/AMT-75 Installation and Operation
DESCRIPTION SPECIFICATION
20
Modulation Phase Error < 2
o
Configurable Forward Error Correction Rate 1/2, 2/3, 3/4, 5/6 and 7/8 convolutional encoding K=7.
Optional: Reed Solomon outer (based on DVB-S/DVB-DSNG standards)
with convolutional inner coding or
Enhanced Turbo code rate range: between 0.448 and 0.914 (see Chapter 9).
Intelsat FEC rates from 16kbps to 52 Mbps (8PSK)
DVB compliant rates from 64kbps to 110 Mbps
Turbo data rates from 64 kbps to 140 Mbps
RF Output Connector TNC (f) Connector, labeled as J1
Impedance: 50
Return Loss: ≥14 dB, 950-1750 MHz; ≥10 dB, 1000-2000 MHz
RF Output Frequency L-Band: 950 to 2000 MHz, variable in 100 Hz steps
Stability: 1 x 10
-8
per day
Frequency Stability: 1 x 10
-7
after 1 hr warm-up internal; 1 x 10
-7
w/o warm-up,
external
Group Delay Variation Per MIL-STD 188-165A requirements
Spectral Inversion No Inversion. Modulation spectral inversion is programmable.
Phase Noise Integrated Single sideband from 10 Hz to 100 MHz: 2.8
o
RMS
Max Output Phase Noise (by offset):
-42 dBc/Hz at 10 Hz
-72 dBc/Hz at 100 Hz
-82 dBc/Hz at 1 kHz
-92 dBc/Hz at 10 kHz
-102 dBc/Hz at 100 kHz
-112 dBc/Hz at 1 MHz
-122 dBc/Hz at 10 to 100 MHz
Phase Perturbation Linear phase: <20
o
in 0.2 seconds under following conditions:
Temperature: Rate of change shall be 22
o
/Hr
Vibration: Between 50-2,000 Hz with constant input acceleration of 1.5 gf/Hr.
Shock: Impact of test hammer of 1 lb. attached to 8” arm through vertical plane;
striking face covered with ½” open cell sponge rubber with the following:
Density: 0.027 lbs/cubic inch
Compression Deflection: 7-14 lb/sq in for 25% deflection
Swing: Free swing through 90
o
arc – impact enclosure at bottom of swing
RF Output Power Range: 0 to -25 dBm, adjustable in 0.10 dB increments, monotonic transitions
w/o burst errors
Accuracy: ± 0.5 dB
Temp Stability: ± 0.25 dB
Off Condition: -60 dBm in any 3 MHz B/W from 0-4000 MHz
RF Output Spurious -51 dBc > 64 kbps; -46 dBc 64 kbps (optional)
RF Output Harmonics -60 dBc up to 12
th
harmonic or 4 GHz, whichever is greater
Modulator to Demodulator Isolation Contribution < 0.2 dB @10
-5
BER over any Tx freq/pwr level from Tx off
Equipment Reference Frequency
& Phase Noise, Internal
Reference Frequency: 10 MHz
External Ref Level: 0 dBm ± 2 dB
Internal Freq Stability: Stratum-1 (0.15 ppm due to all sources)
Max External Reference Phase Noise (by offset):
-115 dBc/Hz at 10 Hz
-135 dBc/Hz at 100 Hz
-148 dBc/Hz at 1 kHz
-150 dBc/Hz at 10 kHz
-160 dBc/Hz at 100 kHz
DEMODULATOR
RF Input Connector Connector: TNC (f), labeled as J2
Impedance: 50
Return Loss: ≥14 dB, 950-1750 MHz; ≥10 dB, 1000-2000 MHz
RF Input 950 MHz to 2000 MHz (min) / 100 Hz step size
RF Noise Figure 9 dB typical; 12 dB at maximum AGC gain
RF Frequency Uncertainty, Min. +30 kHz including Doppler offset
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