[Boatanchors] Question for the group

[Garey Barrell]

>>email: eldim at att.net or eldim at worldnet.att.net
>>
>>     -------------- Original message from "J. Forster" <jfor at quik.com>:
>>     --------------
>>
>>
>>     > It's a fairly old technique to estimate the Q of a coil and look
>>     for shorted
>>     > turns. Basically you set the coil up with a capacitor (either
>>     stray or an
>>     > external C) and apply a pulse and watch the damped sine wave
>>     decay. Quantitative
>>     > measurement is tricky, but it's useful to compare known good coils
>>     with unknown
>>     > ones. Even a single shorted turn can dramatically change the
>>     display pattern. It
>>     > will also show up cracked ferrite cores.
>>     >
>>     > -John
>>     >
>>     > GBrown wrote:
>>     >
>>     > > I have seen an O-scope used to "RING" a coil. I cant find to
>>     much on the net
>>     > > about this. Anyone ever do this with success and if
>>     so.......how?
>>     > > Regards,
>>     > > Gary...WZ1M
>>     > >
>>    
>>
OR ...   If you have a Simpson 260 multimeter (doesn't everyone?) you 
can do the same test by connecting it across the coil, set it to Ohms, 
and switch the polarity reversing switch.  You will get a good "kick" 
each time you flip the switch.   Unless there is even ONE shorted turn.  
Then you'll only see a small "bump" if anything.  

-- 
73, Garey - K4OAH
Atlanta

Drake C-Line Service Manual
<http://hr99.home.mindspring.com/R-4C_Servicez/>