[time-nuts] Quieting the HP-113AR Clock/Frequency Divider

[paul swed]

Jeremy
I have heard about the old movements in time-nuts. Kind of a reason to stay
clear of them for me at least.
Thought they are amazing pieces of equipment, I have 4 clocks on the wall
that have impulse motors. Though not loud you certainly can here the steps
every second.
Sounds like you have success in making it quite.
Regards
Paul
WB8TSL

On Sat, Mar 17, 2018 at 10:38 PM, Jeremy Nichols <jn6wfo at gmail.com> wrote:

> Those of us with the 1960-vintage HP-113AR/BR Clock/Frequency Divider know
> how noisy they are. The mechanical clock movement of my 113AR is loud
> enough that I really don't want to be in the same room with it. I don't
> know if the clocks are noisy from brand-new or if the mechanism gets
> noisier as the various parts wear with age.
>
> Here's how I quieted mine:
> • Wrap the outer cabinet of the 113AR in stick-on automotive sound
> deadener.
> • Put the 113AR in a fully enclosed 4U rack cabinet.
> • Stuff insulation into the cabinet so the 113AR is completely surrounded
> except for the front panel.
>
> Should anyone be interested, I can provide detailed notes, a shopping
> list, and pictures. Total cost was about US$150 and would have been a lot
> less if I could have found a used cabinet at the surplus store.
>
> Jeremy
>
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