Hi David yes I think I have seen similar but not as low as that. If you
compare the suspension points the different vibrational mode should
obvious.....the suspension point is at a node. I think some of these are
quite difficult to excite, I have not seen any suggested circuits but I have
not looked too hard.
Alan
----- Original Message -----
From: "David J Taylor" <david-tay...@blueyonder.co.uk>
To: "Discussion of precise time and frequency measurement"
<time-nuts@febo.com>
Sent: Saturday, January 10, 2015 7:06 AM
Subject: Re: [time-nuts] Mechanical 1PPS Oscillator Disciplining
Hi Tom dividing down wasn't always necessary I have sample from the UK
GPO
Crystal Factory of NT-cut bars, quartz tuning fork, and Gapped Ring
crystals, the latter marked 400cps (pre Hertz :-)) ) I think these are
post WWII because they are mounted in IO base GT style tube envelopes.
Dividers were achieved with neons and locked multivibrators, where
necessary, I believe.
[]
Alan
G3NYK
================================
I have one "500 c/s" GEC crystal in an octal base which is thinner than a
"60 Kc/s" one, so a different mode. Never had it working, though.
73,
David GM8ARV
--
SatSignal Software - Quality software written to your requirements
Web: http://www.satsignal.eu
Email: david-tay...@blueyonder.co.uk
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