[hpsdr] Perseus is a reality

[John Miles]

You could think of that as the IF sampling rate.  The receiver downconverts
to baseband (effectively, it's a direct-conversion receiver with an
image-reject mixer.)

The only question I'd have is, why is it the IF rate limited to 500 kHz?  I
know you can get a lot more data than that through USB 2.0 bulk transfers.
I'd be more interested if it could give me, say, 2.5 MSPS at 16-bit
resolution.  (I'm not sure what 24-bit resolution buys you with 16-bit
ADCs.)

Some other questions:

- Does it include the Verilog or VHDL source for the FPGA?

- I assume the data-acquisition and tuning API is fully-documented, and can
be called by user-written Win32 C++ code, right?  Is the interface DLL
open-source, by any chance?

- What limits the RF coverage to 10 kHz at the low end, and can it be
overridden to cover down to 0 Hz?

It's a nice package, overall, and the software sure looks good.  But other
implementations like the USRP are able to support much wider output
bandwidths.  That's pretty important for me, since I'm interested in
something I can use for instantaneous baseband acquisition from 0 Hz to 1
MHz in a phase-noise measurement rig.  Closed-source drivers and FPGA code
would also be a major drawback compared to the USRP, but I'm not sure if
that's an issue here.

-- john, KE5FX



> -----Original Message-----
> From: hpsdr-bounces at lists.hpsdr.org
> [mailto:hpsdr-bounces at lists.hpsdr.org]On Behalf Of wbr_wf4r
> Sent: Tuesday, October 09, 2007 4:29 PM
> To: Nico Palermo; Philip Covington
> Cc: hpsdr at lists.hpsdr.org
> Subject: Re: [hpsdr] Perseus is a reality
>
>
> ***** High Performance Software Defined Radio Discussion List *****
>
> Hello All,
>               I'm not  a math whiz by any stretch of the imagination, but
> I'm wondering why in the beautiful panel layout that there are buttons to
> select the sampling rates of 125K 250K and 500K when the sdr only covers
> 10KHz to 30MHz?  What does this do for the user?  Should the sampling rate
> be changed depending on the *displayed*  bandwidth?  Or is this a
> given.  I
> assume that the overall sampling rate will be approximately 60 MHz which
> would be the Nyquist rate.  Maybe I just don't understand the labeling
> "Sampling Rate"
>
> 73, Bill, wf4r
> ----- Original Message -----
> From: "Nico Palermo" <nicopal at microtelecom.it>
> To: "Philip Covington" <p.covington at gmail.com>
> Cc: <hpsdr at lists.hpsdr.org>
> Sent: Tuesday, October 09, 2007 5:54 PM
> Subject: Re: [hpsdr] Perseus is a reality
>
>
> > ***** High Performance Software Defined Radio Discussion List *****
> >
> > Thanks, Phil.
> > I trust that the HPSDR group will be able to do the same and/or even
> better.
> >
> > 73s,
> > Nico Palermo iv3nwv
> >
> >
> > > ***** High Performance Software Defined Radio Discussion List *****
> > >
> > > On 10/9/07, Alberto I2PHD <i2phd at weaksignals.com> wrote:
> > >> ***** High Performance Software Defined Radio Discussion List *****
> > >>
> > >> The direct sampling 10 kHz to 30 MHz receiver Perseus is now
> a reality.
> > >>
> > >> See some pictures here :
> > >>
> > >> http://sundry.i2phd.com/perseus
> > >>
> > >> 73  Alberto  I2PHD
> > >>
> > >
> > > Wow, very nice!  The software looks great also.
> > >
> > > Phil N8VB
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