To: | Clemens Paul <rsgb_lf_group@blacksheep.org> |
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Subject: | Re: LF: RE: Scopematch question |
From: | Chris Wilson <dead.fets@gmail.com> |
Date: | Mon, 24 Jul 2017 11:33:46 +0100 |
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In-reply-to: | <3D981576F1544C5CAA9F9D2AABB45304@Clemens0811> |
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Reply-to: | rsgb_lf_group@blacksheep.org |
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Hello Clemens and Alan (Melia), Sorry for very late reply, I have not had access to my GMAIL account for a while and it's the only one Blacksheep do not bounce my mails from. A great reply and I see your addition as well, I understand now why the traces behave as they do off resonance, appreciated!! Thanks to all the excellent and patient help from the LF forums I seem to have finally achieved a reliable and pretty good TX set up for 136kHz, and more than that I believe I have a much better understanding of how everything works and ties in together, which is immensely satisfying considering every element is home built and far more pleasing to use than some black box for HF :) 73 everyone! Saturday, July 1, 2017, 5:18:10 PM, you wrote: > 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 -- Best regards, Chris mailto:dead.fets@gmail.com |
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