[time-nuts] FMT on October 13
steveheidmann at yahoo.com
Tue Sep 25 18:06:37 EDT 2007
Did anyone mention sorbothane ?
Magnus Danielson <magnus at rubidium.dyndns.org> wrote: From: Hal Murray
Subject: Re: [time-nuts] FMT on October 13
Date: Tue, 25 Sep 2007 14:23:21 -0700
Message-ID: <20070925212322.607D3BE29 at ip-64-139-1-69.sjc.megapath.net>
> ); SAEximRunCond expanded to false
> Errors-To: time-nuts-bounces+magnus=rubidium.dyndns.org at febo.com RETRY
> > Make sure not to get near any of the equipment. Free-running
> > oscillators are sensitive to vibration or shock. You've probably heard
> > the story of my best Sulzer oscillator making small phase or jumps
> > which I eventually correlated to when the kids flushed the toilet down
> > the hall.
> Did mounting it on a block of foam help?
That is a rather bad solution. You want much softer material to react to
quicker things, such as silicon rubber. Also, that would only be a 12 dB/Oct
solution. You would really like a few more poles there. The trick is to add
weight to the calculation. So you want a very soft material, holding a thick
block (lead) and from this base suspend the oscillator through a soft material
again. Now you have a 24 dB/Oct solution. The trouble you now will have is that
the wires will be another shock/vibration transport mechanism. They would need
to be connected to the middle-frame such that outer forces hit the middle
weigth and not directly on the sensitive part. They would need to be soft and
arranged is such a way that they do not push or pull the inner end, but is
allowed to flex alot.
It is all just as normal filtering, but in the acoustical domain.
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