[DSP-10] KDSP10 Info

[Doug Bade]

         Thank you Luis !!!!!!


         Well I inserted a 74hct14 flying lead style into the clock line 
and used 2 gate's to double invert and it cleaned the clock up pretty as 
can be and the pll LOCKED !!!!!!!!!!!!!!!!!!!!!!!

         I am testing and checkout as it has been a while but looks like rx 
noise floor dropped 6 db or so maybe more .... -147 dbm is a 10db+ spike in 
the spectral display...in ssb mode  with the rf amp all up and 1200 hz 
window... It works so far, but have not tried tx....

         The clock may indeed be affected by feedthru but looks like that 
should no longer be an issue..... Thanks for the concurrence and idea... I 
will neaten it up and dead bug the ic or something neater...

Doug KB8GVQ




At 12:25 AM 5/22/2003 +0100, you wrote:
>Hi Doug,
>
>I went thought the trouble of using an inverter (unused one on some HC04
>chip)
>and change the software of the DSP to invert the logic of that signal to get
>it
>sharp edge.
>However most of the folks said to me that it was not necessary.
>I blame the feedthrough capacitor I have at the DSP box (too big 4n7)
>maybe that explain why others did not had this problem.
>Don't know if this matches your case, of if it is of any help.
>
>Good luck.
>Luis Cupido.
>CT1DMK.
>
>
>----- Original Message -----
>From: "Doug Bade" <dbade@clecom.com>
>To: <dsp-10@mailman.qth.net>
>Sent: Wednesday, May 21, 2003 11:57 PM
>Subject: RE: [DSP-10] KDSP10 Info
>
>
> >          More info... udiag1 will not run, udiag2 will not run..
> >          Data clock and ena leads are toggling on main 12x.00 pll. output
> > of DO pin is high rail constantly, vco sitting at 129.0 mhz with 5v railed
> > on control line
> >
> >          PLL LMX1501a is not accepting the programming it is sent..
> >          Clock is sloppy with long arcing sweep up on leading edge ... is
> > this normal????
> >          I tried adding pull-up to clock, and it did clean up transition,
> > but no lock either...
> >
> >          DO output never ever changes.... u107 is getting serial enable
> > pulses, data is going to pll chip, enable toggles on pll... but not
> > accepting load...
> >
> > Doug
> >
>
>
>_______________________________________________
>DSP-10 mailing list
>DSP-10@mailman.qth.net
>http://mailman.qth.net/mailman/listinfo/dsp-10