Sujet : Re: Quarter-wave whip earth plane
De : tauno.voipio (at) *nospam* notused.fi.invalid (Tauno Voipio)
Groupes : sci.electronics.designDate : 15. Mar 2025, 19:09:32
Autres entêtes
Organisation : A noiseless patient Spider
Message-ID : <vr4fos$ij7$1@dont-email.me>
References : 1 2 3 4 5 6 7
User-Agent : Mozilla Thunderbird
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)