Re: Central Electronics 20 A Phase shift question
- From: "Steve Nosko" <suteuve.nosukowicuz@xxxxxxxxxxxxxxx>
- Date: Mon, 30 Jan 2006 11:58:01 -0600
I assume you mean the audio phase shift net...
This suggests another signal getting in that is somehow affected by the
audio voltage level.
What you describe could be related to the scope astig adjustment.
or
How about RF in the scope. Kill the RF somehow.
Or power suppkly hum.
73, Steve, K,9.D.;C'I
"Ron H" <rnharsh@xxxxxxxxx> wrote in message
news:lJ6Df.7716$XG4.7514@xxxxxxxxxxx
> Setup:
>
> CE 20A to dummy load
> 1 KHz audio input tone
> scope accross the output of the phase shift network ( 90 deg shift)
>
> Observation:
>
> The X-Y scope display shows a very nice circle which varies in diameter
with
> the amplitude of the input and also varies in diameter (although less
> variation) with the input frequency. The inside of the circle always looks
> to be a well defined circle but the thickness of the line has some
variation
> around the circumference. Thin and sharp at 6:00 thru 10:00 and a little
> thicker from 12:00 to 2:00.
>
> The two signals look great in the time domain just like two sine waves out
> of phase.
>
> Question:
>
> Is there something going on that needs correction?
>
> K3PID
> Ron H.
>
>
>
.
- References:
- Central Electronics 20 A Phase shift question
- From: Ron H
- Central Electronics 20 A Phase shift question
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