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All, these sources of “free books” most likely contain some current copyrighted material and despite a USA string in the URL are more likely Chinese or other offshore based entities. Just know

A lot of good discussion here, but I would like to answer the original question from Diane BONKOUNGOU: In my opinion you are not ready to match the antenna. You should bring the antenna to resonance

Hi, Jerry, You're right that the lowest SWR may not occur at resonance, whichever definition of resonance you use. For a particular combination of antenna and transmission line, 1:1 may not be

Maynard, True in this particular case. I was just trying to simplify matters. I guess I didn't do so well. My point is that the lowest SWR is NOT necessarily the resonant point. In fact, very few

VSWR is measured in voltage but the cause is the difference in impedance (if there is one) between two items - in this case the feedline and the antenna.

First of all, there is no SWR of 1:2. SWR is always X:1. And a 50 ohm cable feeding a 50 ohm load is by definition an SWR of 1:1.

For those that don't like strange download sites, the book is now on archive.org Give the page a couple of hours to populate all the options. The pdf is available now, in browser read later.

One remark regarding the -H versions: If you look at Hugen's schematics, you will see that R5 has the same value of 1 kOhm as for the -H4 version. Therefore Larry's modification can be simplified. No

I have a collection of maybe a dozen Smith Chart variations that I keep as masters to make copies/scans as needed. 73, Don N2VGU

One alternative that I use is the software, 3D Smith Chart: 3dsmithchart.com. Inexpensive. No color crayons necessary, ? Frank K4FMH

Justin, If you follow these things enough, sometimes with the more difficult to understand first, make the later simpler explanations just pop out at you and make sense. There is no wasted perusing of

Hi again, and basic principle of the output impedance measurement. [image: image.png] Step 1. measure outpunt voltage V1 with no load (open circuit) Step 2 terminate ouput with the known resistor Step

Hi all, this might be helpful. [image: image.png] [image: image.png] R should be ~ 1 - 2 kOhm, noniductive. 73 Predrag, 9A3QV

Thanks for this comment Gerard. I upgraded to from DiSlord 1.1 to DiSlord 1.2.00 on an H4.3 and it seems to work. I tried 300 ohm as Zo and it moved the 50 ohm load to the place it should be on a 300

Gerard, It looks like the latest H and H4 firmware from DiSlord also has the Port-Z rescaling. --John Gord

Gerard, In addition to the variable resistance fixture method, there is provision in some firmware versions to mathematically modify the displayed data to show what the response would be in a system

You can create your own by printing or phocopying a blank chart onto A4 transparency film.- Michael (GW7BBY)

Interesting! I use PCmatic anti-virus and it's perfectly happy with that site?? Rudy N6LF

Oops, 27 MB! 73, Justin B. KI5GKD

TNX, just downloaded it. Pretty hefty PDF @ 21 MB! Not sure I'll understand anything in it... :-\ 73, Justin B. KI5GKD