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Well done, Kuya Ariel!! Now, I know where to go when SHTF 😆. Will I ever see this in the show ‘Building Off the Grid?’ Hope to see it one day. - Mervin

Hey Ariel - Looks like you had a vy fine Field Day event in Greer. Great to see the kids get on the air. I worked you on 40CW from our Raleigh FD station W4DW. 73 de K4RLC Bob

Ariel, excellent presentation Sir. Thank you. My hang up in my quest to understand how to measure the performance of my entire EFHW single band vertical antenna is that there is this "assumed range" of impedance at the feedpoint. . So, picking an arbitrary resistor value is making my head hurt a bit. While I believe the resistor method for effectively measuring the efficiency of the transformer is sound, what if the transformer matching ratio is inaccurate? How do I know I'm not off by a thousand ohms or more between the transformer secondary and the radiator -the real actual feedpoint impedance? I am hoping this makes sense. For some reason, I'm not seeing how I can use my tools and instruments to know I've got the most power possible as radiation resistance, and not heat loss in my efficient but incorrect matching transformer. I'm hoping you can help me figure this out. Best 73, Kenny NZ5i

I like mine so much I’m watching RUclips videos about it 🤣 of the mtr4b and qcx mini (and even tr45l), this is my favorite. I’ll have to get a kh1 sometime, but for now the tr35 gets the most use

Can you please share the spreadsheet with formuas?

Thanks for the video!

Awesome presentation.

Looks like a nice summit to hike and activate, Ariel. I chased both you and Walt on the summit that day! Vy 73 de Jonathan "JB"

Love your video format, covered alot of uses with good amount of detail without making it feel overwhelming

Thanks for the video. Very interesting. I like the explanations, but when I use the calculations prescribed with readings obtained from a NanoVNA, I sometimes get results that are physically impossible - with transformer efficiencies in excess of 100%. Something isn't quite right. The traces on the NanoVNA look good, but the efficiency calculations don't hold up. I have checked and re-checked the calculations, including using the proper sign of the variables, but still get physically impossible results. In the case of the back-to-back method, are you sure that the transformer_loss = (insertion_loss/2) - mismatch_loss? Or should it be transformer_loss = (insertion_loss - mismatch_loss)/2? My reasoning behind this is that if you look at both transformers back-to-back as a single transformer, then transformer_loss = insertion_loss - mismatch_loss. Splitting the transformer loss between the two transformers means simply dividing the transformer loss by 2. Hence it seems that it should be transformer_loss = (insertion_loss - mismatch_loss)/2,

Great video! How do you calculate or find the through power used in your analysis?

It’s definitely the power supply/txer of your phone right next to the antenna input and the speaker. It will only happen when the phone is working/transmitting.

change the stimulus , you have to recalibrate.

Hello Ariel, with a great deal of excitement I watch your video as EFHW antennas are my favorite. My location is overwhelmed by RFI and operating portable is my preferred way of playing radio. Seeing S0 between stations on 40m is a real joy. All of my EFHW transformers are made by myself. The latest is 56:1 based on experiments of Colin MM0OPX. It works very well, I made two of them just to test the efficiency of it. Your method of testing them on the single unit is fantastic. I attempted to replicate your spreadsheet, but I got stuck. Would you be willing to share your spreadsheet file with me?Thank you for all the good things you do for us on RUclips. Jurek SP6CAL 73, 44

I’m 68 now, but when I turned 12, my Dad let me be in-charge & take my two brothers, 10 & 8, and hike this loop trail by ourselves while he waiting in his VW Transporter bus in the parking lot. He knew how to fuel the fire of hiking the Great Smokies.

i would love to build something very similar, what is the gadget on the left size and which battery are you using, it all fits so perfect in their

Hello! It's my question that how we can test an antenna for a bipolar monopulse uwb signal for example if that signal has a 5ns width and 100khz repetition..What is the frequency that I have to use as start and stop on nanovna to measure my antenna parameters?????

Very interesting. Is the spreadsheet complicated?

I loved this explanation and the equations. Thank you for all the time and effort

Thank you!!! This is a great video, very informative and has many detailed explanations what and why. 73 Marek SP9TKW

Thank you for putting this video and information together! It has been very helpful!

the KX2 is an awful radio for /p... the menu system is indecipherable - so much so that elecraft has to sell a separate book just to decipher the spaghetti-like, obtuse factory manual - simply awful - i dumped my KX2 after a year and have not regretted it one bit... my other QRP rigs, such as the TX-500 are far more capable, easier to use and just as good as the over-priced, over-hyped KX2... when operating /p you want simplicity, ease of use, robust finals, etc...

Great trip. Inspiring us to go. Where do you access the fire road? Looks like you had a wonderful experience.

Why do you R-Tubers always show it indoors? Now you are also showing effect of coax on the reDINGS. We want to check the antenna, not the whole system. this would allow us to see how hard itis to see the screen when oudoors.

Excellent demonstration

TR45L i.e. no button to set CW monitoring tone frequency. Also the switches to the right (2) and left (1) of the 'aluminium look' plate are a design failure. Same as the too large knobs on the back for the ATU.

Wonderful Scripture. Wonderful classical guitar. No wonder you're a fine CW Op. God Bless

Really nice. Bet he's a gud CW Op also :-)

It turns out that my measuring the reflected and forward power with precision on the OHR precision watt meter at a high resolution - the threshold for triggering the high SWR light is close to 2:1. The SWR meter in the KPA500 is indicating a higher SWR. The OHR watt meter is much closer to the output of the TR45 finals 😊

You said to cut the length but it is not true,when you go left to tune there is rise and not dip ,so you have to increase the the lengh

How did anyone manage without one of these before? SWR meter and a GDO. Although I never had a GDO so it was guesswork and luck. Latest was to test my h/b 2 m 4 element collinear. I've used mine quite a few times Very useful and excellent for the price. G4GHB

Ecellent!

Nice video Ariel. Thanks for the WFD activation. W4OSS

I love my TR-35, great radio and did a short POTA activation while hiking the other day. de KN4OK

Very nice, and I love the music. Be Thou My Vision is one of my favorites.

So I've been trying to talk myself out of purchasing this rig. This might become my x-max gift to myself. I love my MTR4B, but there is something about this radio that I love. You doing a review and showing all the bells and whistles is not doing me any favors. lol

Which QRP radio do you prefer?

Hi Ariel, I just received my built QCX mini for 20M. Thanks for the info! N2OG Scott

Nice Rig Ariel. N0TR

Nice Rig Ariel. Excellent U-Tube. Thanks for posting.

No button to set CW pitch. ON6KE

All my QRP rigs pick up the pops from my phone but I haven't tested the K1

great video. thanks KI5WKM

Question: Should I measure AT (+/- 10' away) from the antenna or where the transceiver connects? I get GREAT readings AT the antenna, and MUCH worse at end of coax where the transceiver connects. What am I doing wrong?

There's a video of a guy using a NanoVNA to inject a signal into an AM only CB to be able to listen to Single Sideband.

Nice one! 73!

73 de LZ1KAK!

What about static charge on the antenna and feedline? I hope you took care of that before connecting your Nano VNA. It could be fried.

Thanks! Great setup. And I had not thought of the Elecraft KX2 battery for the MTR4b - perfect 🙏😎