Topband: Top band sloper resonance

[CUTTER DAVID]

Just a thought: I'm not quite sure of your arrangement, but if the analyser is not grounded it will pick up common mode current and distort the readings; hand holding is also affected. This has confused me a lot in the past. Now I use a clip and tent stake in the ground and that stabilises the readings and gives more consistency. I lay the analyser on the ground.
73 de David G3UNA-G6CP

> On 20 August 2018 at 06:08 Gary Smith <Gary at ka1j.com> wrote:
>
>
> Tom,
>
> Yeah, I'm resigned to doing something like
> that. I just put up a new antenna today,
> 129' and it's still showing resonance at
> 1.725, that's way too low. I need to
> re-measure the old antenna's length, I put
> it up last summer. I do have a few ugly
> vacuum variables around here and should
> see if I can match with one of them
> between the radial plate & feed point.
>
> Enjoy your visit, I love visiting the UK.
>
> 73,
>
> Gary
> KA1J
>
>
> > Gary KA1J,
> > It struck me that maybe you originally cut your sloper a little longer
> > so you could match it with a simple capacitor. My inverted L is
> > resonant on its own, somewhere down in the 1.750 region. It´s
> > effectively matched to 50 ohms by an L network but the series
> > inductance part of the network is made by lengthening the antenna a
> > little. I have a parallel high voltage ceramic capacitor from the feed
> > point to radials. I can´t check the actual values because I´m
> > currently on vacation in W4 land. 73, Tom G3OLB
> >
> >
> >
> > Sent from my iPhone
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