Peterson 490ST Strobe tuner....good?

[Farrell]

Everything I know is below:
  
----- Original Message ----- 
From: "Richard Brekne" <richard.brekne@grieg.uib.no>
To: "PTG" <pianotech@ptg.org>
Sent: Monday, July 01, 2002 6:35 PM
Subject: Re: Peterson 490ST Strobe tuner....good?


> Hi Terry, and thanks for this enlightenment... tho perhaps you can further
> clarify how the various <<weightings>> are actually carried out.

Unlikely.

> Is it such that it starts looking at curves for all the relavant partials...
> spreads for these as one ascends and finds some optimal matching for each
> set... a sorts of curve of curves ?

I don't know.

>... or does it base much on how loud
> different partials are ?

I don't think it differentiates there.

... Or does it search for some cumlative least total
> signifcant (hearable) beats rates...?

I don't know.

>  any more specifics would be nice to
> know.
> 
> RicB

Yes, indeed. 

And if I had a better understanding I would be happy to share. I should think David Carpenter is the guy to speak to this stuff. Ron Koval may well have a good understanding also. Perhaps others??? Care to enlighten us all? I simply don't know much beyond the few basics I have managed to gather. Sorry.    :-(

Terry Farrell
> 
>  Farrell wrote:
> 
> >Hi Richard. Indeed, the Verituner calculates tunings very differently
> >from the RCT, SAT or TuneLab. One can program in what partials to look at,
> >which partials from which notes to compare, it can compare various
> >designated partials from several notes to the target note, and it can
> >weight the various partials from the various notes. Does that make any
> >sense?
> >
> >Ron Koval has done much work on programming the way the Verituner works.
> >For example, the following is how the lowest octave is calculated in one
> >of his setups:
> >
> >The Verituner will look at 10:5 octaves, 4:1 octaves, and 8:1 octaves, and
> >will weight them 30%, 35%, and 35%, respectively. In the middle of the
> >keyboard, he is looking at 4:2 octaves which are weighted at 60% and 6:3
> >octaves weighted at 40%. And on and on. You can change the rules for each
> >octave. The Verituner measures up to like 8 or 12 partials on each note,
> >and then uses whatever partials you inputted rules demand.
> >
> >
> >
> >Awesome machine!
> >
> >Terry Farrell
> >  
> 
> Richard Brekne
> RPT NPTF
> Griegakadamiet UiB
> 
>