Hittite introduced a "low noise" reference a
few years ago, but it was only low noise when
filtered with a big cap. IOW, the cap did
all the heavy lifting and the IC was nothing
special. Good marketing, bad engineering.
Rick
On 12/9/2014 4:30 AM, Bob Camp wrote:
Hi
On Dec 8, 2014, at 10:35 PM, Brooke Clarke <bro...@pacific.net> wrote:
Hi Rich:
Did you use the 723 or . . . .?
As far as I know the 723 is supposed to have low noise.
There are more modern parts with lower close in noise. Linear Technology has a
number of them. Your filter caps take out the broadband stuff, close in is all
that really matters.
Bob
Mail_Attachment --
Have Fun,
Brooke Clarke
http://www.PRC68.com
http://www.end2partygovernment.com/2012Issues.html
http://www.prc68.com/I/DietNutrition.html
Richard (Rick) Karlquist wrote:
On 12/8/2014 4:53 PM, Bert Kehren via time-nuts wrote:
We solved that problem by attaching the regulators to the FRK back plate
which is with fan control is kept within 0.01C. We did not do it for that
purpose but found that we needed some more heat in order to keep the fan in an
optimum fan speed. Rb, OCXO and Fan power transistor are on the back
plate. Works for us.
Bert Kehren
When I designed the E1938A, I chose a reasonable looking voltage
reference IC and put it inside the oven. I figured that was
the end of it as far as tempco was concerned. It was, but it
turned out that the *noise* of the reference was unacceptable
and of course the oven does nothing to fix that. I had to
switch to a lower noise reference.
Rick Karlquist N6RK
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