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

from [Chris Wilson] [Permanent Link][Original]
To: DK7FC <[email protected]>
Subject: Re: LF: Is it expected for antenna phase to change with varying power levels?
From: Chris Wilson <[email protected]>
Date: Wed, 16 May 2018 16:38:05 +0100
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Hello Stefan, Yes the waveforms look perfect, only a minor phase shift
from 12V supply to 55V. 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? Otherwise it's working well :) Thanks for sharing
the circuit.

Wednesday, May 16, 2018, 4:16:58 PM, you wrote:

> Hello Chris,

> It depends on what you mean with 'increased'. If you increase it from 1W
> to 10 kW then i would expect changes. But from 50W to say 200W there 
> should not be significant changes.

> Watch the waveforms. Are they still looking like a pretty sinus at QRO?

> 73, Stefan





-- 
Best regards,
 Chris                            mailto:[email protected]
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