Roger’s one-port method is indeed applicable beyond the “stated” 50 ohm regime, as endorsed by Patricio, within reason. I imagine Leif M meant to write “use series through method with S21 rather than:

Since we’re having do much off-topic fun, I offer the following for you history buffs: So, Hertz begins his work on the first experiments 13 Nov 1886. He finishes up his first experiment to meet the p

Re Brother Dave’s current perception, it seems like the Aether has conspired against situations where X = j0 at Colorado altitude. 73 Ed McCann AG6CX

Tnx Brian Amazing how the physics and the empirical data converge. Ed AG6CX

Have to agree with Jerry re: 5/8 wave antenna. Since we're having such fun, let me commend you to three resonance-related pieces by Owen Duffy ( not that he needs an agent to propagate his rather extr

Hello Dave: Thanks for your comment on High Altitude Bursts. In case you've forgotten, the call back code known only to General Jack D. Ripper at Burpleson AFB was OPE (Our Pure Essence). I suspect th

True that the Yagi is resonant, but it radiates as traveling wave, doesn’ it? Like the V, the rhombic, etc. 5wFenuUq5MiLpT756 ( https://search.app/5wFenuUq5MiLpT756 ) PDF Document · 787 KB ( https://s

Guess you better tell anyone using a Yagi-Uda, or Beverage Antenna that they haven’t really been radiating all these years. Ed McCann AG6CX

To your question, Z, impedance, is in fact a complex number where Z = R + jX , R being resistance and X being reactance. If there is no reactance, X = 0, Z is considered real, Z= R. A bientot, Ed AG6C

Jeff, Francois, et al: Let's try another approach. First of all, eliminate the use of asterisks (*) unless they are to indicate complex conjugates.. My experience shows that it will introduce confusio

Jeff: You might want to try to bring this discussion back to convention, and eliminate the asterisk notation ( *), traditionally used to describe the complex conjugate. Ed McCann AG6CX

Francois and Others- You might take a look at the attachment by Tom Baier. Don't get bogged down in the math, but note where various terms go to zero and what happens to the resultant equations for va

Dave and others: Your Sark-110 was a brilliantly defined and well supported one-port VNA, capable of accurate sweeps, presentation of Z, Rs, Xs, SWR, and export of CSV data as may have been of interes

Jeff, Francois and others (and others): Please look at the screenshot from page 22 0f Harvey Mudd pdf on "S-Parameters Don't Map Clearly to Circuits." S21 = b2/a2 = skip a term for now = V2/V1 * (1+S1

Jeff didn’t mention it, so I will remind all reading (some of whom may not make the connection) that the S21 and its predecessor variables are all complex numbers. Ed McCann AG6CX

Stan- What is the effect if you connect to laptop on battery power. Ed McCann AG6CX Sausalito

Not necessarily 130 feet. Could be as little as 70 feet (20 meters or so) and present itself as a 1/8 wavelength, low radiation resistance, low impedance, and with sufficient CMC radiate from the coax

Not necessarily 130 feet. Could be as little as 70 feet (20 meters or so) and present itself as a 1/8 wavelength, low radiation resistance, low impedance, and with sufficient CMC radiate from the coax

I note the 140 ft end fed is a quarter-wave on 160. Maybe it thinks it’s a vertical? My 135 ft dipole fed with 70 ft of 450 ohm ladder line offers a low Rs resonance at 1/8 wave. Tie both ends of ladd

Let us know what you use and how you measured the RF current. A black art, seldom done, often with dubious results. Ed McCann AG6CX