[Premium-Rx] Cubic CDR-3280 Digital I + Q output

[Mack Rogers]

Indeed that is the problem. This data format isn't something that a soundcard would be able to process, since those process the I&Q on the L&R audio input channels. As far as I know any of the commonly available SDR programs could process the data, IF some way of inputting the data stream to a PC could be found.

I've been like a dog chasing his own tail on this situation for about 4 years now. I dunno what the gov uses this format of I&Q data stream for but it sure would be interesting to find out!

To complicate the matter even further each active output on the J7 connector has an inverted output also.

Who knows, maybe one day I'll be scrounging in some surplus dealers junk at a hamfest and there will be a strange looking box with Cubic Communications on it that cures this problem for me.

N4VGB
Mack Rogers

 

--- On Tue, 1/18/11, David I. Emery <die at dieconsulting.com> wrote:

> From: David I. Emery <die at dieconsulting.com>
> Subject: Re: [Premium-Rx] Cubic CDR-3280 Digital I + Q output
> To: "Mack Rogers" <n4vgb at yahoo.com>
> Cc: wombat5 at ntlworld.com, Premium-Rx at mailman.qth.net
> Date: Tuesday, January 18, 2011, 1:06 AM
> On Mon, Jan 17, 2011 at 09:59:38PM
> -0800, Mack Rogers wrote:
> 
> 
> > The serial data is framed in 32 bit words consisting
> of 16-I and 16-Q
> > bits. The pinout and signals are well defined in the
> manual. Our problem
> > is nobody seems to know how to deal with this data
> format.
> 
>     Virtually ANY SDR software expects such
> data formats or similar
> as its basic internal format for sample data, but obviously
> to use the
> data from this radio you both have to get it into the
> computer in some
> reasonably efficient fashion and provide software drivers
> for the input
> hardware that interfaces with the existing sound card
> oriented code.
> 
> 
> > 
> > But I have successfully used the SoftRock Lite IF kit
> SDR piece to process the RF IF output in a PC. So I may not
> be missing much by not being able to use the J7 data output.
> But it would be nice to find out some day. LOL
> > 
> > N4VGB
> > Mack Rogers
> > 
> > 
> > 
> >  
> > 
> > --- On Mon, 1/17/11, David I. Emery <die at dieconsulting.com>
> wrote:
> > 
> > > From: David I. Emery <die at dieconsulting.com>
> > > Subject: Re: [Premium-Rx] Cubic CDR-3280 Digital
> I + Q output
> > > To: wombat5 at ntlworld.com
> > > Cc: Premium-Rx at mailman.qth.net
> > > Date: Monday, January 17, 2011, 11:43 PM
> > > On Sun, Jan 16, 2011 at 10:51:56AM
> > > -0000, wombat5 at ntlworld.com
> > > wrote:
> > > 
> > > > The output I am asking about is the digital
> serial
> > > output from the 15
> > > > pin D connector J7.  From the connector
> info in
> > > the manual there is a
> > > > serial data output, a clock, and a frame
> sync. Looks
> > > like it will remain
> > > > a mystery!
> > > 
> > >     You COULD look at these signals 
> > > with either a logic analyzer or
> > > a DSO with relatively deep storage.... or
> both. 
> > > Likely they  consists
> > > of 8 or 16 or 24 bit word containing one I or Q
> sample sent
> > > bit
> > > serially - or perhaps two words (I and Q) after
> each frame
> > > sync pulse.
> > > 
> > >     Using this for anything would require
> > > some hardware to take
> > > the serial bits and clock them into some kind of
> register
> > > for access
> > > by software on a processor (presumably a PC)...
> > > 
> > > 
> > > -- 
> > >   Dave Emery N1PRE/AE, die at dieconsulting.com 
> > > DIE Consulting, Weston, Mass 02493
> > > "An empty zombie mind with a forlorn barely
> readable
> > > weatherbeaten
> > > 'For Rent' sign still vainly flapping outside on
> the weed
> > > encrusted pole - in 
> > > celebration of what could have been, but wasn't
> and is not
> > > to be now either."
> > > 
> > >
> ______________________________________________________________
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> > > 
> > 
> > 
> >       
> 
> -- 
>   Dave Emery N1PRE/AE, die at dieconsulting.com 
> DIE Consulting, Weston, Mass 02493
> "An empty zombie mind with a forlorn barely readable
> weatherbeaten
> 'For Rent' sign still vainly flapping outside on the weed
> encrusted pole - in 
> celebration of what could have been, but wasn't and is not
> to be now either."
> 
>