[time-nuts] Heated crystal? & Rb tube corrosion (FE-5680A)

Steve . iteration69 at gmail.com
Thu Dec 1 04:18:03 EST 2011


Bill,

You did notice that i stated i can't speak for the FE-5680A? All that I
have reference too are pictures at the moment.

My help files?   I don't run windows, thanks.  But the reason I asked here.

Also, I was under the impression that Rb ovens operated around 80c if the
Rb oven gets that hot that it had oxidized...

Comments on the crystal? Is the crystal heated or a LF acoustic resonator?

Steve




On Thu, Dec 1, 2011 at 3:25 AM, WB6BNQ <wb6bnq at cox.net> wrote:

> Steve,
>
> I viewed not just the picture you referenced but all of the pictures at
> that site
> and was unable to detect ANY corrosion of any kind.  What you are seeing
> are
> scratch marks in the anodized plating due to having the Rb removed from
> heavily
> plated circuit board that is used as a heat sink for the Rb.  At one end
> of the
> physic package is a circular shaped housing which has some rosin left on
> it, a
> thermistor or two attached and some kind of bonding material used for
> mounting
> the heating transistors that has changed color because that part is heated
> when
> it is running; that is not corrosion.  The screws attaching that item to
> the rest
> of the physic package have fiberous material for a mounting washer to
> buffer
> vibration or are used as insulators; that is not corrosion.  The screws
> that are
> holding down the circuit board press down on a gold plated circular area
> used for
> grounding besides being used for a mounting point; that is not corrosion.
>
> I think you need to reboot "your" internal operating system and then do a
> serious
> update on your help files.
>
> Bill....WB6BNQ
>
>
> "Steve ." wrote:
>
> > Bill,
> >
> > I was starting to think i may have to crack open an instrument to get a
> > picture. But i found a reference online.
> > http://n1.taur.dk/fe5680a-2/IMG_1375.JPG
> >
> > Note the corrosion around the cheaper metal parts (screws, spacers,
> shell).
> > I can't speak for the FE-5680A, but when i see something like this in the
> > instruments i maintain it's a tale-tale sign gas mitigation.
> >
> > Steve
> >
> > On Thu, Dec 1, 2011 at 12:16 AM, WB6BNQ <wb6bnq at cox.net> wrote:
> >
> > > HUH ?
> > >
> > > What, exactly, do you mean by "corroded Rb tube interfaces ?"
> > >
> > > bILL....wb6bnq
> > >
> > >
> > > "Steve ." wrote:
> > >
> > > > snip
> > > >
> > > > Also It appears that quite a few of
> > > > these have corroded Rb tube interfaces.
> > > >
> > > > Thanks,
> > > > Steve
> > >
> > >
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