Hello
A really simple way to 'match' your antenna after
gathering the feed-Z at the interested frequency
is to enter the data into ===>
"*Iowa Hills Smith Chart v3.0*" software to establish
the matching elements needed.
73 Dick/w7wkr
On Wed, Mar 29, 2023 at 9:02 AM <topband-request@contesting.com> wrote:
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> 1. 160, 80 and 40 Meter Inverted L Tuning (Bill Smith)
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> ----------------------------------------------------------------------
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> Message: 1
> Date: Wed, 29 Mar 2023 15:26:04 +0000 (UTC)
> From: Bill Smith <ko4nrbs@yahoo.com>
> To: "topband@contesting.com" <topband@contesting.com>
> Subject: Topband: 160, 80 and 40 Meter Inverted L Tuning
> Message-ID: <1962277811.1953715.1680103564896@mail.yahoo.com>
> Content-Type: text/plain; charset=UTF-8
>
> I put up a 160-meter Inverted L in my backyard with traps for 80 and 40
> meters.? The vertical section is up about 35 feet with 31 feet of wire
> between the 80-meter and 40-meter trap.? From the 80-meter trap to the end
> of the antenna is 60 feet of wire.? It is hung as a sloping U.? At the end
> of the U bend in the wire is a 4-inch pulley.? It's the best I can do with
> my small yard.? I have tried various lengths of a counterpoise as well as
> my radial field with no luck.??
> >From my VNA
> 80 Meters at 3.850 MHzSWR-11.5Smith Chart- 26.7ohms 372pfResistance- 50
> ohmsReactance- S11x100 -111 ohmsSWR at 4.000 MHz is 12.6
> 160 Meters at 1.9000 MHzSWR- 32Smith Chart- 1.648 ohms 473
> microhenriesResistance- S21x100- 50 ohmsReactance- S11x100- 10.04 ohmsSWR
> at 2.000 MHz is 50
> I obviously have a lot of research yet to do but wanted to see if these
> results make sense or not.? Any ideas on the best way to tune this?
> 73,Bill KO4NR
>
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> End of Topband Digest, Vol 243, Issue 16
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