Highlights: 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: <http://pcovington.blogspot.com/> Soon to follow QS1R will be the QS1T transmitter board. 73 de Phil N8VB
on 2007-01-01 16:37
on 2007-01-01 21:58
Philip Covington wrote: > Two independent RX channels anywhere in 0.1 to 33 MHz > 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...
on 2007-01-02 12:23
On Mon, Jan 01, 2007 at 10:36:38AM -0500, Philip Covington wrote: > Two independent RX channels anywhere in 0.1 to 33 MHz > 73 de Phil N8VB Looks great Phil! Keep us posted. I definitely want one! Eric, K7GNU
on 2007-01-02 15:33
Philip Covington wrote: > Two independent RX channels anywhere in 0.1 to 33 MHz > 73 de Phil N8VB > Bandwidths of 33MHz ? Does this board dump 16-bit complex samples at the back-end? That would put you at about 4 times the available bandwidth of the USB bus. Have I misunderstood something? Ryan