[time-nuts] Noisy clocks [Was: Atomic Clocks]

Jeremy Nichols jn6wfo at gmail.com
Fri Jan 4 23:53:06 EST 2019


Bill,

I've done much the same thing, putting the 113AR in a small rack cabinet
stuffed full of Fiberglas® house insulation. I also lined the 113AR cabinet
with rubber insulation designed for high-end auto sound system. The rubber
absorbs high frequency vibrations and the Fiberglas® absorbs lower
frequencies. I'm now working on installing the rack cabinet into an old
kitchen cabinet lined with styrofoam and Fiberglas®. That should knock the
noise down even further. Multiple plexiglas windows will allow the clock
face to be seen; I'll add some LEDs inside the 113AR cabinet to illuminate
the clock.

Jeremy


On Fri, Jan 4, 2019 at 7:56 PM Bill Hawkins <bill.iaxs at pobox.com> wrote:

> Well, your first clue should be the heavy box that contains the hardware.
> Don't recall any other HP gear built that way. The box could have been an
> aluminum casting.
>
> I had two of them with about the same noise, many years ago (but not
> new).  I used standard fiberglass wall insulation to line a wooden cabinet
> that also contained the 103 crystal standard. That made the noise bearable
> and kept the 103 temperature stable.  Of course, you had to open the front
> insulated door to see the clock.
>
> Never found out if it was the 1 KC stepper motor or the gearbox making the
> noise.  Should have tried heavy grease on the motor gears, but that would
> make a mess of the chassis.  Too late now.
>
> Bill Hawkins
>
> On Fri, Jan 4, 2019, at 4:01 PM, Jeremy Nichols wrote:
> > Does anyone know how loud the mechanical analog clock in the HP-113AR
> > Frequency Divider/Clock is supposed to be? Mine is loud to the point of
> > being annoying. I've surrounded it with insulation, which helps, but it's
> > not really quiet. I never saw one of these things when new (1960) so I've
> > no idea whether the noise is simply a function of design and construction
> > or if mine is worn after 50+ years of use. [The noise is mechanical
> > gear-type noise, not 1000 Hz whine from the driving frequency.]
> >
> > Jeremy
> >
> > On Fri, Jan 4, 2019 at 2:11 PM paul swed <paulswedb at gmail.com> wrote:
> >
> > >
> > > On Fri, Jan 4, 2019 at 4:28 PM Mark Sims <holrum at hotmail.com> wrote:
> > >
> > > > My 5065A has the Patek clock.   Those suckers are LOUD.  You can hear
> > > them
> > > > ticking two counties away...  hence mine is always disabled.  Once
> > > started,
> > > > you have to power cycle the machine to get it to shut up.
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