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Re: LF: Is it expected for antenna phase to change with varying power le

To: [email protected]
Subject: Re: LF: Is it expected for antenna phase to change with varying power levels?
From: DK7FC <[email protected]>
Date: Wed, 16 May 2018 18:49:12 +0200
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Hello Chris,

Congrats to your working circuit.

Am 16.05.2018 17:38, schrieb Chris Wilson:
Hello Stefan, Yes the waveforms look perfect, only a minor phase shift
from 12V supply to 55V.
Maybe there is a transformer between antenna and the phase meter that starts to saturate at QRO? Some nonlineatity, that's my own idea. It could also happen in the variometer circuit, if you use the wrong cores. But it shouldn't.
  But the vario circuit seems ultra sensitive, a
sniff of wind moving the antenna around sees the motor constantly
correcting. As does changing voltage to the amp considerably, so it
changes from "QRP" to QRO. Am I right in thinking adding another two
BAT42 diodes or whatever they are in each leg of the last opamp will
calm it down a bit?
In the original schematic there is a potentiometer ( 1 MOhm) for adjusting the sensitivity.

73, Stefan

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