[time-nuts] Re: DOXCO from Z3801

[Edesio Costa e Silva]

Hi!

Found original page at
https://web.archive.org/web/20050318020038/http://homepage.sunrise.ch/mysunrise/shegnauer/Z3801A/Outer%20Oven%20Controller/z3801a_outer_oven_description.htm
but the images are missing.

Edésio

On Wed, Dec 07, 2022 at 10:17:14AM -0800, ed breya via time-nuts wrote:
> I don't recall seeing that anyone ever reported the official temperature
> setpoint for the outer oven. Most of the info on the Z3801A still resides on
> realhamradio.com.
>
> I found in my notes a paper printout of a webpage apparently put up someone
> named Shegnauer, circa 2006, showing the schematic, and some info and
> estimates for the temperature range, and a spice model of the control system
> operation. It's a nice document. I tried to find it online now, but it seems
> to have disappeared over the years. The same link showed up in old messages
> on time nuts and other lists, but it appears dead now. It must have been
> pretty well known, so it's likely still floating around out there at some
> URL or in someone's files. If you don't have it already, you should try to
> find it. I only have the paper copy.
>
> Anyway, it was suggested that the outer oven should run around 60-65 deg C,
> while the thermistor is around 16.2 k ohms there. Personally, I believe this
> is too high, and should be around 50-55 deg C or maybe a bit more - right
> near the maximum ambient rating for the Z3801A, neglecting any internal box
> temperature rise. If the performance specs are relaxed toward the higher end
> of operating temperature range, then the outer oven may not have to run so
> high. I don't recall, but think that may be the case.
>
> Ed
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