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Re: [Discuss-gnuradio] New Software Defined Receiver soon to be availabl

From: Marcus Leech
Subject: Re: [Discuss-gnuradio] New Software Defined Receiver soon to be available
Date: Mon, 01 Jan 2007 15:56:16 -0500
User-agent: Thunderbird (X11/20061206)

Philip Covington wrote:

16 bit 130 MSPS ADC
HPF, LPF, RF AMP Switchable Front End
0-31.5 dB Attenuator in 0.5 dB steps
Cyclone II FPGA
Two AD6620 DDC co-processors
USB 2.0 480 Mbps High Speed Interface to PC
0.1 to 33 MHz coverage (0.1 to 65 MHz extended)
RX bandwidths from 33 MHz to 1kHz
Two independent RX channels anywhere in 0.1 to 33 MHz
6.00" X 4.00" board size
Single +12V 1A supply
Open Source Software and Hardware

Prototype picture and preliminary info at:


Soon to follow QS1R will be the QS1T transmitter board.

73 de Phil N8VB

Phil, this looks pretty good.

A quick comment, though. Some of the daughtercards for the USRP produce complex baseband signals (I and Q), which are then sampled by the twin 12-bit A/Ds. Since you are using real-mode only sampling, it would be inconvenient to attach (for example) a DBS_RX type front-end to your SDR card, since the DBS_RX uses a complex baseband. All of the modern satellite front-end chips, for example, use a complex-baseband direct-conversion approach.

My interest is radio astronomy, and while I'm perfectly happy with the USRP for my own use, I'd be happy to include support for your HPSDR card in my radio astronomy applications once your product is stable, and there's "driver" support in
 Gnu Radio for it...

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