3/11/2023 0 Comments Printable smith chart![]() That's because few understand it.So for me, at least, the Nano VNA is a device that allows (almost requires) I find few hams at Zoom meetings can answer that concept in a sentence or 180 degrees isĮquivalent to 360 degrees when drawn on a Smith Chart, so you get back to If the length of the transmission line is electrically 180ĭegrees (half-wave), the impedance remains the same. Related only to the magnitude, and not the phase, remains unchanged - for a So whilst the impedance change, the SWR, which is The transmission line changes the impedance (both R and X) but does notĬhange its magnitude. Ohm coax) alter the impedance (at your radio) but does NOT change the SWR There are multiple ways of basically writing the same information.Īnd finally, why does changing the LENGTH of the feed line (again, say 50 ![]() Sometimes the reflection coefficient is expressed in dB too. When on a transmission line, it can be expressed as a reflectionĬoefficient. It has aĪnd a phase angle of arctan(50/50() = 45 deg However, it can be expressed in different ways. I don't think it would achieveĪnything useful to give you those equations. The impedance can be expressed as a reflection coefficient, andįrom the magnitude of the reflection coefficient, which depends on the coax Hence there is an infinite number of impedances that have the same Impedance is a vector quantity - it has magnitude and phase. * The imaginary part of the impedance is different. That alone means the impedances are not the same. * The real part of the impedance is different (one is 30 ohm, the other 40 Why is that?īecause there is an infinite number of different impedances that have the There are zillions of combinations of R,X that (with 50 ohm coax feed *They don't!* If R *or *X changes, the impedance changes. Was kind of a piece of magic for me as I thought about this Why do different values of R and X have the same impedance? That So on my PPT presentation, I added a few slides about Smith Charts and Watch out - there is a short QUIZ at the end of this pdf file. With appreciation for all of the helpful comments from this IO group. So for me, at least, the Nano VNA is a device that allows (almost requires) going over some fundamentals about antennas, impedance, R and X values, and matching. I find few hams at Zoom meetings can answer that concept in a sentence or two. Why is 40 + j30 ohms a different impedance from 30 + j40 ohms?Īnd finally, why does changing the LENGTH of the feed line (again, say 50 ohm coax) alter the impedance (at your radio) but does NOT change the SWR (at least not by much). There are zillions of combinations of R,X that (with 50 ohm coax feed line) can have the identical SWR. Why do different values of R and X have the same impedance? That was kind of a piece of magic for me as I thought about this. So on my PPT presentation, I added a few slides about Smith Charts and Antenna Impedance: I've been a licensed ham for over 60 years, but rarely if ever did I have to look at or discuss a Smith Chart of an Antenna.īut having a Nano VNA forced me to relearn about plotting R and X values on a Smith Chart. The Universal Music artist is currently recuperating from a throat surgery following a haemorrhage on his vocal chords.In my Zoom presentations on the Nano VNA as an antenna analyzer, I often get to the topic of looking at "Antenna Impedance" (Resistance and Reactance plots) on a Smith Chart. The album’s phenomenal success has only added to the ‘Stay with me’ hitmaker’s skyrocketing popularity, as he has performed to sold-out crowds across the globe and picked up four Grammy awards, including Best New Artist. In the Lonely Hour has sold over a million copies in Britain and the US. Released in 1970, the album managed the first full 52 weeks in the top five. The only other act to rival this feat was the American folk rock duo Simon & Garfunkel, who caused a stir with their final studio albumīridge Over Troubled Water. “Seeing this statistic genuinely makes me feel very weird, but also insanely happy and just so thankful to everyone who has purchased the album. English singer Sam Smith has achieved a chart feat only previously managed by rock legends The Beatles.Īccording to Official Charts Company, the 23-year-old singer’s debut record ‘In The Lonely Hour’ became the only album after The Beatles’ groundbreaking debut ‘Please Please Me’ to log an astonishing 50 weeks in the top five.
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