wrote in message
...

Yes the 995x has a 4 to 20 multiplyer, but this increase the jitter on
the
output frequnce, therefore i prefere an 400MHz precition osc. if it is
possible to find it.

One way would be to have a VCO and simple 8-pin PLL I guess clocking the
chip ?

Your going to be hard pushed to find an XTAL block with a 400MHz output.

Some of the older Pentium mother boards used to use an XTAL and a chip to
generate the main hundred-odd MHz clock, not sure what the chips where
though.

I've used such multiplier chips to go from 10 to 60 MHz, for example. Look
carefully at the jitter specs. You won't like them.



During his talk on the Software Defined Radio at the recent Central States
VHF Conference, Gerry Youngblood mentioned that they avoid programming the
9954 to certain frequencies in order to reduce the worst spurs.

Those operating frequencies are achieved by slight changes in the software
and setting the 9954 to a "good" nearby frequency.

No details were given and I didn't get around to asking for the details.
Does AD give hints?

On Fri, 8 Aug 2003 11:17:00 -0400, "R J Carpenter"
wrote:


wrote in message
.. .

snip

Those operating frequencies are achieved by slight changes in the software
and setting the 9954 to a "good" nearby frequency.

No details were given and I didn't get around to asking for the details.
Does AD give hints?

If you go to www.analog.com/dds then scroll down & select the
"Technical Library" link (under the "Technical Support Resources"
heading) you can download the DDSTutor (900K+ pdf-file).
Then do a Ctrl-F and search for "sweet" in the pdf itself.
Some hints are given there.

Chris Muriel, G3ZDM

On Fri, 8 Aug 2003 11:17:00 -0400, "R J Carpenter"
wrote:


wrote in message
.. .

snip

Those operating frequencies are achieved by slight changes in the software
and setting the 9954 to a "good" nearby frequency.

No details were given and I didn't get around to asking for the details.
Does AD give hints?

If you go to www.analog.com/dds then scroll down & select the
"Technical Library" link (under the "Technical Support Resources"
heading) you can download the DDSTutor (900K+ pdf-file).
Then do a Ctrl-F and search for "sweet" in the pdf itself.
Some hints are given there.

Chris Muriel, G3ZDM

On Sat, 09 Aug 2003 10:20:08 +0000, chrisdot muriel wrote:

If you go to www.analog.com/dds then scroll down & select the
"Technical Library" link (under the "Technical Support Resources"
heading) you can download the DDSTutor (900K+ pdf-file).
Then do a Ctrl-F and search for "sweet" in the pdf itself.
Some hints are given there.

Unfortunately, the file does not seem to be available currently. I found
the link for it
(http://www.analog.com/UploadedFiles/...17DDStutor.pdf), but
it takes you to a "not found" page.

On Sat, 09 Aug 2003 10:20:08 +0000, chrisdot muriel wrote:

If you go to www.analog.com/dds then scroll down & select the
"Technical Library" link (under the "Technical Support Resources"
heading) you can download the DDSTutor (900K+ pdf-file).
Then do a Ctrl-F and search for "sweet" in the pdf itself.
Some hints are given there.

Unfortunately, the file does not seem to be available currently. I found
the link for it
(http://www.analog.com/UploadedFiles/...17DDStutor.pdf), but
it takes you to a "not found" page.

On Thu, 28 Aug 2003 17:03:01 -0400, "Mark J. Dulcey"
wrote:

On Sat, 09 Aug 2003 10:20:08 +0000, chrisdot muriel wrote:

If you go to www.analog.com/dds then scroll down & select the
"Technical Library" link (under the "Technical Support Resources"
heading) you can download the DDSTutor (900K+ pdf-file).
Then do a Ctrl-F and search for "sweet" in the pdf itself.
Some hints are given there.

Unfortunately, the file does not seem to be available currently. I found
the link for it
(http://www.analog.com/UploadedFiles/...17DDStutor.pdf), but
it takes you to a "not found" page.

The 1st link under "Technical Documentation" doesn't work.
The one under Tutorials (right at the bottom) does work :
http://www.analog.com/UploadedFiles/...17DDStutor.pdf

Chris Muriel, G3ZDM

On Thu, 28 Aug 2003 17:03:01 -0400, "Mark J. Dulcey"
wrote:

On Sat, 09 Aug 2003 10:20:08 +0000, chrisdot muriel wrote:

If you go to www.analog.com/dds then scroll down & select the
"Technical Library" link (under the "Technical Support Resources"
heading) you can download the DDSTutor (900K+ pdf-file).
Then do a Ctrl-F and search for "sweet" in the pdf itself.
Some hints are given there.

Unfortunately, the file does not seem to be available currently. I found
the link for it
(http://www.analog.com/UploadedFiles/...17DDStutor.pdf), but
it takes you to a "not found" page.

The 1st link under "Technical Documentation" doesn't work.
The one under Tutorials (right at the bottom) does work :
http://www.analog.com/UploadedFiles/...17DDStutor.pdf

Chris Muriel, G3ZDM