[sdiy] VCO Stability

[Magnus Danielson]

From: patchell <patchell at silcom.com>
Subject: [sdiy] VCO Stability
Date: Wed, 20 Feb 2002 21:02:16 -0800

Jim,

>     I just got done doing another temperature run on the VCO I am
> working on.  The first run, I had between 500->700ppM/C drift  (the
> range is because I used two different ways to measure the temperature,
> and there was some disagreement).  The run I just completed got me down
> in the range of about 50ppm/C.  I made an adjustment to the gain in the
> temp compensation, and it seems to have done the job.  This is still
> preliminary.  I am going to do another run to see if I get the same
> results.
> 
>     I am still going to post the schematic...but, I have been just a
> little bit too lazy of late...I will post it.  I am sort of excited
> about it.
> 
>     And just to assure everybody, this VCO does not use any hard to find
> parts...well, maybe the J111 Fet might be a little tricky, but it is the
> only one.

Stop tickeling me Jim, please put it up for us to see (at least I want
to see it)!

I have been thinking on different ways of getting around all this
temperature compensation stuff, but never got down to the drawing
board.

Cheers,
Magnus