Message-ID: <3740F99E827E4E6C8EF621ED8756DC28@gnat>
From: "Alan Melia" <alan.melia@btinternet.com>
To: <rsgb_lf_group@blacksheep.org>
References: <1478421187.20170701142226@gmail.com>
Date: Sat, 1 Jul 2017 14:42:05 +0100
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Subject: LF: Re: Scopematch question
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Status: RO

Chris my interpretation of this is in terms of the waveforms on transmission 
line. You could think of the current and voltage referring to the real part 
of the complex load impedance (ie the "R" bit) and the phase difference 
between the traces as the imaginary (reactive, or "X" bit) part.

So if the voltage peak grows and the current decreases then the resistive 
impedance is increasing. Any misalignment of the current and voltage peaks 
indicates a net reactive component not tuned out.....inductive in one 
direction and capacitive in the other.

I think that should allow you to envisage the result of the mistune.

Alan
G3NYK


----- Original Message ----- 
From: "Chris Wilson" <dead.fets@gmail.com>
To: <rsgb_lf_group@blacksheep.org>
Sent: Saturday, July 01, 2017 2:22 PM
Subject: LF: Scopematch question


> Hello rsgb,
>
>
> My scopematch setup appears to work as intended and into a good
> quality dummy load of 50 Ohms impedance the volts and amps traces sit
> perfectly upon one another. If my antenna is even SLIGHTLY off
> resonance the volts trace level increase substantially. Is this
> because the off resonance antenna is getting less current, but more
> volts into it? I am not 100% sure of the correlation between volts
> shown and resonance, if someone could briefly explain I'd appreciate
> it, thanks. 2E0ILY
>
> -- 
> Best regards,
> Chris                          mailto:dead.fets@gmail.com
>
>