| 2/10 |
 COM-4008 [850 - 1600 MHz] Quadrature modulator and RF frequency synthesizer
The COM-4008 is a quadrature modulator with built-in RF frequency synthesizer. The carrier is programmable by steps of 100 KHz or less over the entire frequency range.
As with other ComBlocks, the COM-4008 modulator can be monitored and controlled through the user-friendly graphical user interface or by software (see API).
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| 10/09 |
Full-Duplex Operation
ComBlock modules were originally designed to operate as uni-directional (simplex) devices. In order to provide a higher integration level, ComBlock has released several software upgrades which enable full duplex operation. For instance, it is now possible to build a full-duplex RF modem with only five ComBlocks, and a full-duplex baseband modem with only three modules.
Following the software upgrades, these modules can now operate in full duplex mode:
- COM-5003 TCP-IP / USB Gateway
- COM-5004 IP Router
- COM-7002 Turbo code error correction encoder / decoder, up to 11.7 Mbit/s
- COM-1202 PSK/QAM/APSK Modem, up to 22 MSymbols/s. USB 2.0 interface
More software upgrades will follow.
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| 4/09 |
COM-1209ASOFT High-speed DVB-S2 BCH Encoder & Decoder
This BCH error correction encoder and decoder is written in VHDL to run at extremely high speed on FPGAs.
A typical throughput on a Xilinx Virtex-5 FPGA is 1 Gbit/s at encoding and 800 to 950 Mbits/s at the decoder. Throughputs in excess of 400 Mbits/s are also achievable on Xilinx Spartan-3 FPGAs.
The VHDL code implements all 21 BCH variants listed in the ETSI EN 302 307 DVB-S2 standard. The error correction capability is t = 8, 10 or 12 bit errors per frame, with frame lengths ranging from 3 Kbits to 58 Kbits.
VHDL code overview
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| 3/09 |
 COM-3010 [925-2175 MHz] Receiver
This RF front end module features high sensitivity (-63 dBm), fine (20 Hz) frequency tuning steps over the entire frequency range, low phase noise (-73dBc@1 KHz), 70 dB AGC and dual 10-bit 105 MSamples/s A/D converters. It is designed for direct interface with an external C/Ku/Ka-band LNB: 75 Ohm input, 13/18V 500mA LNB supply and bidirectional DiSEqC control.
Typical applications include Direct-to-home TV set-top box and VSAT.
It is a perfect front-end for developing DVB-S2 applications on a compatible FPGA development board (COM-1200, COM-1400).
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