VSATplus Product Website

Advantech AMT-34 Quad Demodulator


  • NEW Turbo Code Option 0.75 to 0.95
  • Quad Demodulators in 1U Chassis
  • 9.6kbps to 10Mbps in 1bps steps
  • Select 70MHz or L Band
  • PSU and Reference for LNB
  • RS422 serial via RJ45 connector
  • Optional Ethernet 10BaseT Interface
  • Optional Front LCD Display and Keyboard

The Cost Effective AMT-34 is the ideal solution in hubs providing star configured FDMA and frame relay networks. Provision for Serial data, (via EIA530, RS422) or IP data, (via the IP Gateway Bridge Router RJ45 interface) ensures connectivity to most system architectures. These attributes and the modular and flexible construction provide the opportunity to construct the solutions best suited in today’s cost conscious system designs.

The AMT-34 provides BPSK, QPSK, 8PSK and 16QAM demodulation schemes and Viterbi as the FEC as standard, individually on each demodulator. The addition of Reed Solomon and the New Turbo codec provide performance gains. TCP simultaneously offers increased coding gain, lower decoding delay and significant bandwidth savings. The rates
span from 0.75 to 0.95 dependant on modulation type and are interoperable with market standard.

Given the modular design the unit can be configured to offer L band Rx, 70MHz RX. It’s directly modulated L band transmit signal leads to an extremely pure spectrum resulting in efficient uplink systems, and the L band has a resolution of 100Hz.

In large installations, multi-drop RS485 M&C is used to control several AMT-34’s or you can use the Ethernet interface with Telnet or SNMP. A PC may be used to configure the unit and access all alarms and status messages. A front panel jack is provided on each unit for local hand-held terminal access. All other connections are located at the rear panel of the unit.

The data interface is RS422 signal levels via an independent RJ45 connector from each demodulator. Optionally, it can be equipped with an Ethernet 10BaseT IP Gateway
interface providing a single connection for all traffic.

The L-Band input to each dual demodulator is via an F-type connector (standard). The 70 MHz input to each dual demodulator is via a BNC connector.

Performance specificationsModulation modes: BPSK, QPSK, Optional: 8PSK, 16QAM
FEC: Viterbi: ½,3/4 or 7/8 rate, k=7
Optional: Reed Solomon Outer Codec for Viterbi
Optional: Turbo Product Code, ¾, 7/8 or 0.95Data and code rates (in 1 bps increments)
BPSK, ¾ rate: 14.4 to 4425 kbps
BPSK, 7/8 rate: 16.8 to 5162 kbps
BPSK, 19/20 rate: 18.5 to 5686 kbps
QPSK, ¾ rate: 28.8 to 8850 kbps
QPSK, 7/8 rate: 33.6 to 10000 kbps
QPSK, 19/20 rate: 37.0 to 10000 kbps
8PSK, ¾ rate: 43.2 to 10000 kbps
8PSK, 7/8 rate: 50.4 to 10000 kbps
8PSK 19/20 rate: 55.5 to 10000 kbps
16QAM, ¾ rate: 57.6 to 10000 kbps
16QAM 7/8 rate: 67.2 to 10000 kbps
16QAM: 128kbps to 120Mbps
Scrambling: V.35, IESS 308/309 CCITT
Spectral Shape: IESS 308/309 compliant
Roll off: 0.15, 0.20, 0.25, 0.30, 0.35
RF Frequency
• L-band: 950 to 2150Mhz in 1Hz steps
• Optional: 70+/-18Mhz and L-band,140+/-36Mhz and L-bandModulator specific
IF Output Connector
• Type N (f) 50 Ohm for L-band
• BNC (f) for 70/140Mhz, 50 Ohm
• Return Loss ≥17dB
RF Output Power
• Range: -5 to -35 dBm, in 0.10 dB steps
• Accuracy: +0.5 dB; Temp
• Stability: +0.25 dB
Output spurious/Harmonics: -55dBc DC to 2500Mhz/-50dBc; 1900Mhz to 2500Mhz
Phase Noise: IESS 308/309 compliant
BUC Reference Frequency and Stability
• Frequency: 10 MHz, 0 dBm, +2 dB
• Stability: 5 x 10-9/per day; 5 x 10-8/year, no frequency/phase hits for external ref.
• Optional: BUC Power Supply 24VDC@4A, 48VDC@2A, 48VDC@4A.Demodulator specific
F Input Connector:
• Type N (f) 75 Ohm for L-band
• Option: BNC (f) for 70/140Mhz. 50 Ohm
• Return loss: ≥12 dB
• LNB Alarm for Short Circuit
RF Input Power Levels
• Lband: -70 to -40dBm, with AGC
• 70/140: -55 to -35dBm, -5dBm max composite level, with AGC
LNB Power and Control
• Selectable LNB Supply Voltage: ON/OFF, 18 VDC, (Horizontal Pol.) or 13 VDC (Vert Pol.), 0.5A max
• LNB Control: 22 +4 kHz single tone burst, amplitude = 0.6 +0.2 V p-p BUC Reference Frequency and Stability
• Frequency: 10 MHz, 0 dBm, +2 dB
• Stability: 5 x 10-9/per day; 5 x 10-8/year, no frequency/phase hits for external ref.Physical and Power Specifications

1RU standalone chassis,
19W X 19D X 1.75H inches
(48W X 48D X 4.4H cms)
Weight: 11lbs (5kgs)
Power: 90 – 264VAC (50/60H) or -48VDC (32 to 72VDC).
Power consumption: 50Watts (no BUC power supply)
Operating temp: 0°C to 45°C(32°F to 122°F)
Storage temp: -25°C to 85°C(-13°F to 185°F)
Relative humidity:
Operating: Up to 90% non-condensing
Non-Operating: Up to 95% non-condensing
Operating: up to 10,000’ (3,045M)
During Transit: up to 40,000’ (12,180M)Management and Control
Active Front Panel:
Provides display and keypad on front panel for access to all functions, alarms and status messages
Hand Held Terminal
Allows text-based access to all functions, alarms and status messages
Remote Monitor and Control
10/100 Base-T port, RS-485, and RS-232 at rear panel. Can be managed by Windows GUI, CLI, Telnet, SNMP v2, and HTTP.Data Interfaces
10/100Mbps Ethernet (IP router/ Bridge)

IP options:
• Static and Dynamic IP routing (RIPv1&2)
• DHCP Server
• Network Address Translation
• Packet Filtering (Firewall)
• Quality of Service support to Level 3
• Command line interface (Industry Standard)
• SNMP v.1 & v.3, MIB II
• AAA (Authentication, Authorisation & Accounting)
• Local AAA (Access Rights Table)
• PAP, CHAP, MS-CHAP (Client/Server Authentication)
• RADIUS, TACACS+ (Client, Remote server authentication)
• Ping, Traceroute, Discovery Protocol
• IP, TCP, UDP, ICMP Protocol Statistics
• Interface Statistics
• Multicast
• VPN Support
• IP Header Compression
• Payload Compression
• Telnet
• Large IP/ethernet packet support (MPLS)
Bridging options:
• Spanning Tree Protocol (STP)
• Rapid STP (RSTP)
• MAC filtering
EIA-530 (RS422)
Can either be transported transparently or can interface and interoperate with Frame relay or HDLC.

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