IG-18 and IM-5258

[Mark Graalman WB8JKR]

 My IG-18 (stock) measures about .15%
 I'm wondering if the feedback level in the
generator may be set too high, or the
null alignment in the Dist meter may be off,
or maybe a common mode hum?

Mark  WB8JKR


On Sun, 30 Jan 2005 11:05:49 -0500 Ron <ra.ah at RCN.COM> writes:
> Please respond here, as I am also very interested. I have an
> IM-5218 that measures at around 0.4%. I seem to remember a
> previous generator (that I unfortunately sold many moons ago)
> that came in at 0.1%.
> 
> Thanks,
> 
> -- Ron
> 
> 
> Greg Boye wrote:
> > I remember reading an article a year or two ago about someone 
> making some slight changes to an 
> > IG-18 audio generator to improve its distortion specs.  Does 
> anyone know where I can find this 
> > article or post on the web?  The reason that I am asking is that I 
> recently purchased an IM-5258 
> > Harmonic Distortion analyzer and I connected it to my IG-18 audio 
> generator the other night to 
> > check it out.  It measured my oscillator at 1% THD and I confirmed 
> it with using an older IM-58 
> > tube analyzer.  Looks like I will tear open the IG-18 tonight to 
> see what I can find.  While I am at it,
> > I may want to perform the modifications at the same time.
> > 
> > Thanks,
> > Greg W8NGA 
> 
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