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

[Mack Rogers]

Lemme see if I can clean this all up a bit and make it clearer. In standard CDR 3280 form and just like the manual on the Cubic website, you have back panel mounted BNC connector J9 that is WBIF output that is standard old RF of about 30khz bandwidth centered at 456khz. Then you have BNC connector J6 that is NBIF output that is RF centered at 455khz and is about the bandwidth of your front panel selection. Now we come to J7 which is a 15 pin male subminiature D connector that has a 3mhz TTL level serial I&Q data stream on it, page 2-7 in the manual. If anyone has the software to process the output of J7 please send me an email. I'd love to have that software! I ran this info on J7 output under the noses of every SDR geek I could think of and came up with nuttin' honey.

Now we come to what I thought was being presented in the original post that started this exchange. An option that I've been told existed on the  3280 but have never personally seen, another back panel jack with the same type I&Q signal that you would find coming from a SoftRock IF Lite board to your PC for processing.

Sooooooo if the original post is referring to the output of J7, I dunno what to tell him?

If the original post is referring to the I&Q output option I've never seen but only heard about, it should be some type of 3 wire connector, tie it to the L&R of your PC sound input and run any of the SDR software available on the web and let us know what happens???

And all that should make it perfectly clear as mud.

N4VGB
Mack Rogers   





--- On Sat, 1/15/11, GandalfG8 at aol.com <GandalfG8 at aol.com> wrote:

> From: GandalfG8 at aol.com <GandalfG8 at aol.com>
> Subject: Re: [Premium-Rx] Cubic CDR-3280 Digital I & Q output.
> To: Premium-Rx at mailman.qth.net
> Date: Saturday, January 15, 2011, 4:17 PM
>  
> In a message dated 15/01/2011 20:31:44 GMT Standard Time,
> pasha at kali.com 
> 
> writes:
> 
> It seems  you mentioned that these are digital
> outputs.
> 
> Some responses here seem  appropriate for analog
> outputs, but probably
> not for digital  outputs.
> 
> There is probably someone here who knows the format and
> levels  of
> these digital outputs.
> 
> 
> 
> --------------
> IQ signals are digital by definition, it's not that
> previous responses were 
>  directed at analogue outputs but just that in amateur
> circles such  
> signals are generally mixed down into the audio range for
> processing  and fed to 
> the left and right inputs of the sound card to get them
> into the  PC.
> I would recommend again the Gerald Youngblood article that
> I mentioned  
> previously, as this may aid your understanding.
>  
> There are other interfaces available but ultimately these
> do much  the same 
> job and this method is by far the most straightforward
> and  economical, 
> especially given the wide range of excellent software
> that's  freely available.
>  
> Obviously it's important to keep signal levels such that
> the sound card  
> isn't overloaded, and important too to make sure that the
> frequency range of 
> the  IQ IF output is appropriate, which is basically
> what I said earlier!
>  
> regards
>  
> Nigel
> GM8PZR
>  
>  
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