[hpsdr] [OT] "STAR-10" transceiver?

[Bob McGwier]

Gian:

Cornell is a well known engineer and has worked in several large 
establishments that do work primarily for government customers.  In the 
amateur radio arena,  he designed the Dentron MLA2500.

I know that he claims inventor status on the DDS referenced PLL and this 
was done for spur mitigation.  I have done no research on this so he may 
very well be the inventor.  He is an "anti-spur" fanatic as he asked me 
detailed questions about DDS spurs and I found he did not know of some 
of the most recent work by Analog Devices for example.  He told me he is 
publishing an article in an upcoming issue of QEX on the Star-10.  He 
also offered that he would be available to adapt relevant pieces of the 
Star-10 to an SDR.    He is fascinating to talk to and when I engaged 
him on SDR topics,  he asked ALL of the right questions.  He thought the 
SDR1000 was an old style direct conversion receiver so was extremely 
dubious about the claimed dynamics (as measured in the ARRL labs).  This 
sounds to me like it might be a much better opportunity for us to mine 
good technology than the "Picky Star" where the only star allowed is Sir 
Peter himself.

Ciao!
Bob
N4HY


Giancarlo Moda wrote:
> ***** High Performance Software Defined Radio Discussion List *****
>
> Hi Ken,
>
> the project seems to be quite interestin, looking at
> the circuit diagram.
>
> The data reported it seems to me very "aggressive" ...
> but everything is possible.
>
> The English prject CDG2000 with front end H-Moder
> Mixer with IP3 over +45dBm has IMD generated by the
> passive coils nad f.e. filters and has an IP3 of
> +40dBm. 
> The STAR 10 has the first mixer with an IP3 of +25dBm,
> meaning you have an LO with a lot of power to drive
> it... so LO spurs possible to go around.
>
> If you are looking for a very interesting 100%
> homebrew project look at the STAR II (G3XJP
> Pic-A-STAR) a software transmitter and receiver with
> very ineteresting performances, a very good software
> package and no PC use, except to download the
> software...
>
> visit: http://uk.groups.yahoo.com/group/picastar/
>
> 73
>
> Gian
> I7SWX
>   

-- 
Robert W. McGwier, Ph.D.
Center for Communications Research
805 Bunn Drive
Princeton, NJ 08540
(609)-924-4600
(sig required by employer)


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