coupled motions

[Jim Coleman, Sr.]

Hi Don:

Were your measurements taken with the listening ear? Or did you tweak
the up or down cents buttons?  Did you use a common weighted keystroke?

That seems to be a lot of variation. I've found it difficult to get
consistent readings without a special key striker. The tones are too
transient. This is why I no longer argue about the accuracy of the RCT 
or any other electronic tuning device. There is just too much variation
in the way a note is played or read with the machines.

Jim Coleman, Sr.


On Sat, 7 Nov 1998, Don wrote:

> Hi,
> 
> I decided to try an experiment.
> 
> The tools:
> 
> RCT for win95 using a pzm microphone , 40" Gerhard spinet equipped with
> humdity control and tuning stabilized to no note moved more than 2 cents on
> yearly tunings. 
> 
> The note:
> 
> F4 (it is good enough for Dr. S, so it should be a good choice), microphone
> resting with the mic facing the piano strings and the edge of the mic just
> being missed by the f4 key, music desk removed.
> 
> RCT set with no calculated tuning (like a SAT with no stretch calculation
> or fac)
> 
> The f4 was played 20 times then tuned aurally to the best of my ability.
> Readings are taken sequentially so as to minize drift due to heating or
> other factors.
> 
> f4 at f4 all three wires.
> 
> -2.50;-2.59;-2.38;-2.04;-1.49
> 
> f4 at f4 bass wire
> 
> -.94;-1.31;-1.76;-1.45;-1.05
> 
> f4 at f4 middle wire
> 
> -.84;-1.41;-1.25;-1.50;-1.22
> 
> f4 at f4 treble wire
> 
> -.99;-.70;-.73;-1.10;-1.48
> 
> f4 at f5 all wires
> 
> -.50;-.93;-.82;-.47;-.90
> 
> f4 at f5 bass wire
> 
> +.49;+.48'+.38;+.23;-.10
> 
> f4 at f5 middle wire
> 
> +.20;+.03;-.32;-.13;+.01;-.06
> 
> f4 at f5 treble wire
> 
> +.28;-.10;-.34;-.01;-.34
> 
> f4 at c6
> all
> +4.52;4.51;4.45;4.80;4.44
> bass
> +4.44;+4.44;4.57;4.49;4.54
> middle
> +4.64;+4.69;4.63;4.68;4.76
> treble
> +4.73;+4.55;4.50;4.67;4.66
> 
> f4 at f6
> all
> 6.37;5.84;5.71;5.91;5.62
> bass
> 6.15;5.94;5.95;5.43;5.44
> middle
> 7.16;6.46;5.71;5.73;5.44
> treble
> 6.17;5.51;5.54;5.87;5.68
> 
> f4 at a6
> all
> -3.24;-3.03;-2.62;-3.19;-2.76
> bass
> -2.42;-2.39;-2.51;-2.59;-2.54
> middle
> -2.75;-2.40;-2.64;-2.71;-2.40
> treble
> -2.89;-2.57;-2.64;-3.10;-2.98
> 
> f4 at c7
> all
> 18.60;18.54;18.88;18.61;18.62
> bass
> 18.89;19.11;18.11;18.91;18.95
> middle
> 18.55;18.56;18.80;18.33;18.99
> treble
> 18.86;18.74;18.74;19.07;18.86
> Regards,
> Don Rose, B.Mus., A.M.U.S., A.MUS., R.M.T., R.P.T.
> "Tuner for the Centre of the Arts"
> drose@dlcwest.com
> http://www.dlcwest.com/~drose/
> 3004 Grant Rd.
> REGINA, SK
> S4S 5G7
> 306-352-3620 or 1-888-29t-uner
> 
>