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FWIW here is what I measured for the conventional and WTST using my nanovna. I verified the calibration when I saw the negative inductance for the WTST at 28Mhz.?
Conventional????????????????????????
??????L Wind (uh)?L Half Wind?Leak??K
7Mhz??13.56?? ? ? 3.92??? ? ? 0.107?0.996046758211066
10Mhz?10.42?? ? ? 2.98?? ? ? ?0.107?0.994852394070841
14Mhz?7.42??? ? ? 2.13?? ? ? ?0.106?0.992831448793946
18Mhz?5.2???? ? ? 1.51??? ? ? 0.106?0.989755214492647
21Mhz?3.6???? ? ? 1.16??? ? ? 0.106?0.985167780408777
28Mhz?1.26??? ? ? 0.435?? ? ? 0.106?0.957012547395809
????????????????????????
WTST????????????????????
7Mhz??12.98?? ? ? 3.72?? ? ? ?0.067?0.997415767187798
10Mhz?10.13?? ? ? 2.91?? ? ? ?0.067?0.996687504803284
14Mhz?6.97??? ? ? 2.05?? ? ? ?0.066?0.99525416175213
18Mhz?4.11?? ? ? ?1.28?? ? ? ?0.066?0.991938307476537
21Mhz?1.96??? ? ? 0.74??? ? ? 0.066?0.98301908964793
28Mhz?-1.43?? ? ?-0.18?? ? ? ?0.066?0.976650476806393
Tony
AD0VC
From: [email protected] <[email protected]> on behalf of John Z <jdzbrozek@...>
Sent: Thursday, September 14, 2023 11:58 AM To: [email protected] <[email protected]> Subject: Re: [QRPLabs] #qmx Antenna Tuner Can Kill PAs ?
Tony,?
In LTSpice if you hover the cursor over a component as if to measure current through it, then press ALT and right click, LTSpice will give you a plot of instantaneous power. You can window that plot for the time period of interest. Then hover
the cursor over the plotted variable name above the plot. Press CTRL and left click. LTSpice will integrate the instantaneous lower over the window interval and open a box with the result.
Since core magnetic materials tend to show reduced permeability at increasing frequency, I like to use my NanoVNA to measure inductance as seen at the relevant frequency. This usually works pretty well unless parasitic capacitances bring a resonance
nearby.
JZ
On Thu, Sep 14, 2023, 1:05 PM mux_folder2001 <canthony15@...> wrote:
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