From: "Clemens Paul" <cpaul@gmx.net>
To: <rsgb_lf_group@blacksheep.org>
References: <1478421187.20170701142226@gmail.com>
In-Reply-To: <1478421187.20170701142226@gmail.com>
Date: Sat, 1 Jul 2017 18:18:10 +0200
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Subject: LF: RE: Scopematch question
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Hi Chris,

At a given power into a load voltage increases at the sqrt of increasing R because U = sqrt(P*R).
When a complex load comes into play V increases with |Z| which is sqrt (R^2 +X^2)
So at resonance,i.e. w/o any reactance |Z|( now =R) has the lowest possible value because X=0 .
Your antenna-feeder tuner system has a very high loaded Q (causing the very small bandwidth).
Hence X (inductive or capacitive) increases very rapidly off resonance and therefore voltage too.

73
Clemens
DL4RAJ 


>-----Original Message-----
>From: owner-rsgb_lf_group@blacksheep.org 
>[mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of Chris Wilson
>Sent: Saturday, July 01, 2017 3:22 PM
>To: rsgb_lf_group@blacksheep.org
>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
>
>
>
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