Re: LF: Re: Automatic Variometer adjustment at DK7FC

[Stefan Schäfer <Stefan.Schaefer@iup.uni-heidelberg.de>]

Jim,

Another thought:

Am 23.12.2011 12:17, schrieb James Moritz:
> [...] I guess the inertia of the motor and gearbox will produce some 
> hysteresis, moving the variometer to a very slightly over-adjusted 
> position after the motor drive is removed, which will also help to 
> prevent the system continuously searching around the correct tuning 
> point.[...]
This effect can be compensated by choosing the dead band treshold value. 
Then the motor gets stopped a bit before the resonance point and will 
exactly land on it. As good as having an infinitesimal small dead band ;-)
Anyway we are talking about phase angles which are very very small, much 
below that what could become critical for a PA.
73, Stefan/DK7FC