My recommendation:
For any ham newby in rf calculating, who is seriously willing to learn,
or who simply wants to optimize his antennas (by using his NanoVNA, or not)
the fastest and (to my knowledge) so far best way is by:
1. downloading Ward Harriman, AE6TY's freeware SimSmith and
2. watching Larry Benko, W0QE's SimSmith Basics videos.
Free download is available here:
Some of Larry's videos may be found here (and after that you can google for many more):
SimSmith probably is the most advanced rf design Smith Diagram software available today.
It is not yet finished though, not 100% free of errors, but in the process of constant improvement.
For any serious ham or RF Engineering student it is a "must have".
73, Hans
DJ7BA
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Von:
[email protected] <
[email protected]> Im Auftrag von Bob Albert via Groups.Io
Gesendet: Montag, 9. M?rz 2020 04:07
An:
[email protected]Betreff: Re: [nanovna-users] Dumb question: What are REAL, IMAG, and PHASE good for? #general_vna
Good questions; unfortunately the answers can get involved.
Yes, real and imaginary are resistance and reactance. Usually in Ohms. Reactance is Z sin(phase angle) and resistance is Z cos(phase angle). The display may only give the angle; I'm not sure.
You can use the phase angle plot to locate resonance; it jumps sharply at that frequency, more sensitive than trying to sweep around to find where it crosses the resistance axis (Smith chart).
Much can be learned by fiddling with it.
Bob K6DDX
On Sunday, March 8, 2020, 07:58:03 PM PDT, Robert Stone <rjstoneus@...> wrote:
So I'm a ham and I usually just use the NanoVNA for analyzing "1 port networks" otherwise known as antennas. But I do try to learn other stuff, and I ran into something that doesn't make sense to me.
I thought that REAL and IMAG would be the same as resistance and reactance, but it seems like they're the sin/cos of the phase angle or something? Which step in the math are these values?
Also I'm just curious as to what PHASE is useful for. I'm guessing it's probably most useful for a DUT that is an amplifier or filter. (More stuff that I have yet to learn much about.)
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KV0A - Robert
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