Article <vr4fos$ij7$1@dont-email.me>

Warning: mysqli::__construct(): (HY000/1203): User howardkn already has more than 'max_user_connections' active connections in D:\Inetpub\vhosts\howardknight.net\al.howardknight.net\includes\artfuncs.php on line 21
Failed to connect to MySQL: (1203) User howardkn already has more than 'max_user_connections' active connections
Warning: mysqli::query(): Couldn't fetch mysqli in D:\Inetpub\vhosts\howardknight.net\al.howardknight.net\index.php on line 66
Article <vr4fos$ij7$1@dont-email.me>

Deutsch English Français Italiano

<vr4fos$ij7$1@dont-email.me>

View for Bookmarking (what is this?)
Look up another Usenet article

Path: ...!eternal-september.org!feeder3.eternal-september.org!news.eternal-september.org!eternal-september.org!.POSTED!not-for-mail
From: Tauno Voipio <tauno.voipio@notused.fi.invalid>
Newsgroups: sci.electronics.design
Subject: Re: Quarter-wave whip earth plane
Date: Sat, 15 Mar 2025 20:09:32 +0200
Organization: A noiseless patient Spider
Lines: 25
Message-ID: <vr4fos$ij7$1@dont-email.me>
References: <1r8zjnr.1exnyup1tqp24zN%liz@poppyrecords.invalid.invalid>
 <m391p2Fu217U1@mid.individual.net>
 <1r900dz.zmjlph1mxwv5uN%liz@poppyrecords.invalid.invalid>
 <m3979iFbusU1@mid.individual.net>
 <1r90y9e.lg2bzlf6j0urN%liz@poppyrecords.invalid.invalid>
 <vr39e2$24vbj$1@gonzo.revmaps.no-ip.org>
 <1r98c8c.uogzmm1f2zam0N%liz@poppyrecords.invalid.invalid>
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8; format=flowed
Content-Transfer-Encoding: 7bit
Injection-Date: Sat, 15 Mar 2025 19:09:33 +0100 (CET)
Injection-Info: dont-email.me; posting-host="ac4294248f99a51a6329a7f434b225ac";
	logging-data="19047"; mail-complaints-to="abuse@eternal-september.org";	posting-account="U2FsdGVkX185K2JoUtmcaB71YlpwoKmgQrYAextJjZs="
User-Agent: Mozilla Thunderbird
Cancel-Lock: sha1:0pNYb+nWuo/vk1K/lKNI0bm5fxw=
In-Reply-To: <1r98c8c.uogzmm1f2zam0N%liz@poppyrecords.invalid.invalid>
Content-Language: en-US
Bytes: 2224

On 15.3.2025 11.23, Liz Tuddenham wrote:
  I need to do a crash
> course in interpreting Smith Charts.

The NanoVNA will show the reflection attenuation or VSWR
if you're intimidated by the Smith chart.

The Smith chart shows the both the amplitude and the phase
of the measured reflection. The coordinates are the resistive
and reactive components of the reflection scaled to the system
reference impedance (here: 50 ohms). The coordinate lines are
circles for easy handling of the reflection. Traces of constant
SWR are circles centered on the 50 ohm center point.

The VNA has very small coaxial connectors (SMA), so you'll
need adapters to more conventional feed line connectors.
I prefer adapters with a piece of cable between the connectors,
to protect the small connectors from mechanical stresses.

-- 

-TV (oh2ug)