At 1:13 PM +0000 7/3/09, [email protected] wrote:
[snip]
-----Original Message-----
From: [email protected] [mailto:[email protected]] On
Behalf Of Bruce Griffiths
Sent: Thursday, May 28, 2009 7:13 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Broken Ovenaire OSC 85-50
Joe [Trantham]
Whilst its easy enough to construct a miniature RF current probe using a
small ferrite core which is slipped over the wire in which the current is to
be measured, constructing one using a split ferrite toroid is more difficult
as such toroids are difficult to come by. In principle one can construct
ones own by cutting and grinding a pair of toroids. Unless one has access to
diamond lapping equipment and diamond saws this is probably impractical.
Actually, at least in the US it's easy to get such blades from
lapidary shops for less than US $10. Here's one:
<http://www.dadsrockshop.com/blades.html>
The traditional approach is to hold the oddly shaped object to be cut
in pitch. By lapidary standards, ferrites are pretty soft, and so
should cut quite quickly.
Joe Gwinn
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