How much RF current typ flows in the REF + DIR on a 3-el yagi ? YO just shows a 'relative' scale for the parasitic ele's. IE: just to simplify things, let's say we have 10A flowing into the 30 ohm fe
Jim, I would opt for the clamp on RF transformer... Now, having said that, I recognize that anything we do to measure the RF current is going to upset balance, impedance, etc. to a greater or lesser
some googling will show some experimental and modeled results for this... but a bit of thought will give you some idea of what is going on. consider for example a simple 2 element yagi that is tuned
I am surprised that YO or 4nec2 don't include actual current measurement in the parasitic elements. EZNEC includes a table of current amplitude and phase for each segment of each element. However the
4nec2 includes the nec2 output file with numbers if you want them. I use File/Save Nec output file, then look at the file (after a calculate) If you specify the voltage magnitude correctly on your in
The numbers you get seem about right. For the DE, the 7.6 amps implies a feedpoint resistance of about 26 ohms. Which is reasonable for a yagi. The other element currents seem about right too. Since
Jim, I would opt for the clamp on RF transformer... Now, having said that, I recognize that anything we do to measure the RF current is going to upset balance, impedance, etc. to a greater or lesser
You can look at the segment currents... in 4nec2, you can click on the segment of interest and it will tell you the current in that segment. It's most convenient if you have an odd number of segments
COnsider each of the elements as a separate radiator. The pattern in the far field is just the sum of the contributions from each of the elements, adjusted by the phase and magnitude of that element,
Don't know about YO, but 4nec2 definitely has segment currents. The phase reference is the same as the reference for the excitation voltages. Typically you want to know relative phases for elements,