[DSP-10] U7 not locking up

Thu, 31 Jul 2003 19:16:56 -0700

Mike and Chuck,

Have you tried Roger Hayward's PLL Tuneup Proceedure?

   http://users.easystreet.com/rhayward/dsp10/

Do make sure that the serial communications are correct and that the PLL is
getting loaded with the correct values.

   http://www.proaxis.com/~boblark/dig_ser1.htm

- Steve
 ([email protected])

-----Original Message-----
From: [email protected]
[mailto:[email protected]]On Behalf Of Larry Johnston
Sent: Thursday, July 31, 2003 6:56 PM
To: [email protected]
Subject: Re: [DSP-10] U7 not locking up

Hi Mike,

I rechecked all the corrections thru rev 4.5 and everything looks OK. The
voltage on U6-3 is 2.47V. I built my unit from a TAPR kit, no parts
substitutions. When I load the PLL diagnostic program I see data moving on
U7-5&7 and pin 6 goes low for awhile. It appears that the wrong data is
being loaded. I just got another email from Chuck, WA6EXV, and he is still
having the same problem. He tried changing the MC145170 but that did not
help. Any more ideas?
Thanks for the quick response.
73's Larry  K6HLH
----- Original Message -----
From: "kd7ts" <[email protected]>
To: <[email protected]>
Sent: Thursday, July 31, 2003 5:24 PM
Subject: Re: [DSP-10] U7 not locking up

> It might be a good idea to read through rev 4.5
> and make sure all the corrections have been
> implemented.
>
> R108 affects serial timing and was changed to
> allow more time for the serial loading.
>
> Mike KD7TS
> _______________________________________________
> DSP-10 mailing list
> [email protected]
> http://mailman.qth.net/mailman/listinfo/dsp-10

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