AW: [DSP-10] DSP-10 Completion

[Paul Kupper]

Hi  Jess

Congratulations for the good work. S... happens, that's always the same. =
The serial signal comes out of the IC U5 of the EZ-Kit lite. In general =
that is a Voltage translator from RS232 to 0 +5 Volt.
=20
I have direct mailed to you some files with the requested pages.

I use a heater fan "for shrieking" to remove big SMD's. Heat as little =
as possible and try to lift the SMD with a knife or long needle or =
something similar.

73 de Paul HB9OMQ

-----Urspr=FCngliche Nachricht-----
Von:	W4mvb@cs.com [SMTP:W4mvb@cs.com]
Gesendet am:	Sonntag, 4. August 2002 01:34
An:	dsp-10@mailman.qth.net
Betreff:	[DSP-10] DSP-10 Completion

Good Evening to All,

I would like to add my comments to those already posted here.  What a =
great=20
project!  I finally completed my unit yesterday after several months of=20
delays (most of which were not related to the DSP-10).  I've spent all =
day=20
playing with it.  What a super toy.  Thanks to Bob for all his hard work =
and=20
to the TARP guys who made the whole process enjoyable.

I changed C117 from 10pf to 6.8pf during construction as suggested by =
KO7N=20
and W7CQ.  As suggested by Bob, I also connected a ground from the =
R105/C113=20
junction and adjusted L102 for 123.5 Mhz during preliminary checks.  =
When I=20
installed the EZ lite board the PLL locked from below 144 to above 148=20
without touching L102 at all.

The only problems I encountered were self inflicted.  One of those was a =

pretty big deal.  Midway through checkout I lost PLL lock.  After =
flailing=20
around in the dark for a while and changing U104 twice, (once on =
speculation=20
and once because I blew it up with a meter lead)! Common sense set in =
and I=20
ran diagnostics.  The serial diagnostics showed me that I had lost the =
serial=20
data stream (FL0) at pin 33 of P3 on the EZ lite board.  A new EZ lite =
board=20
fixed the problem -- though the pain persists!

Apparently one of the things that you don't get with the new boards (in=20
addition to the dos software) is a user's manual.  I got the impression =
from=20
a reply I got from a previous post that user manuals came with the =
earlier=20
models.  Is it practical, and would someone be willing, to make a copy =
of a=20
page or two from the manual which would allow me to diagnose the loss of =
FL0?=20
 The processor still works OK.  I get the blinks on the LED and =
everything=20
else seems to work.  If the signal comes from the CPU it may be an =
exercise=20
in futility anyway.  I'm not sure I'm up to changing a 128 pin flatpack!

Thanks for the help and the bandwidth and again my thanks for a great =
project.

73 de Jess - W4MVB




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