[time-nuts] Broken Ovenaire OSC 85-50 (Cutting ferrite cores)

Joe Gwinn joegwinn at comcast.net
Fri Jul 3 15:57:01 UTC 2009


At 1:13 PM +0000 7/3/09, time-nuts-request at febo.com wrote:
>[snip]
>-----Original Message-----
>From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] 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




More information about the Time-nuts_lists.febo.com mailing list