9 ай бұрын
10 ай бұрын
Жыл бұрын
Жыл бұрын
Жыл бұрын
2 жыл бұрын
2 жыл бұрын
2 жыл бұрын
2 жыл бұрын
2 жыл бұрын
3 жыл бұрын
3 жыл бұрын
3 жыл бұрын
3 жыл бұрын
3 жыл бұрын
Пікірлер
@RadioK4RLC 15 күн бұрын
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
@CaptainRadioAdventures 14 күн бұрын
@@RadioK4RLC hey Bob - great to hear from you.
@kennymanchester Ай бұрын
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
@CaptainRadioAdventures Ай бұрын
The 64:1 impedance ratio is an estimate based on the secondary to primary turns ratio. 50x64 is 3200 ohms. The actual end fed impedance is band dependent and will have a return loss or VSWR that is also band dependent. The real antenna impedance at the feedpoint will vary and in my experience - as one adjusts the wire length for lowest SWR - this is typically very close to 3200 ohms on 20m. On a wire cut for 40m fundamental - the best SWR is typically on the first harmonic and not the fundamental but that is the way I tend to balance the bands. You will get 3200 ohms on the real antenna by adjusting wire length. You will not be off by a thousand ohms unless you choose to do so. More than likely, you will be off by a few ohms. I am an engineer - and as engineers typically think close is good enough
@natchradio 3 ай бұрын
I like mine so much I’m watching KZbin 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
@GlennMusser 4 ай бұрын
Can you please share the spreadsheet with formuas?
@RabbitHoleAdventures 4 ай бұрын
Thanks for the video!
@yowsa52 5 ай бұрын
Awesome presentation.
@kc1mxb 6 ай бұрын
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"
@Caseytheradioguy 7 ай бұрын
Love your video format, covered alot of uses with good amount of detail without making it feel overwhelming
@ingeniousys 7 ай бұрын
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,
@Mike-nf5pt 7 ай бұрын
I've had the same problem with calculated efficiency > 100%. It's caused by inaccuracy in the NanoVNA's measurement of S21 when you take into account all the strays associated with the measurement. You can usually get a reasonable result with a "naked" transformer, short leads and a good test jig, but once you build it into a box it becomes very difficult. Incidentally, you need to add the input impedance of the S21 port (nominally 50 ohms) to the resistor value.
@hankhamner3671 8 ай бұрын
Great video! How do you calculate or find the through power used in your analysis?
@DaveW6OOD 8 ай бұрын
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.
@patrickdemeyer2210 8 ай бұрын
change the stimulus , you have to recalibrate.
@geokuf9679 9 ай бұрын
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 KZbin. Jurek SP6CAL 73, 44
@CaptainRadioAdventures 7 ай бұрын
Jurek - I can email you a copy of the base valve on Excel
@1999jimi 9 ай бұрын
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.
@shadowlab9543 9 ай бұрын
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
@CaptainRadioAdventures 7 ай бұрын
The gadget on the left is a phone holder that is mounted to the angle
@ltlt6117 9 ай бұрын
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?????
@LA9RKA 10 ай бұрын
Very interesting. Is the spreadsheet complicated?
@CaptainRadioAdventures 10 ай бұрын
Not at all
@radioman5466 6 ай бұрын
@@CaptainRadioAdventures Would you share a copy of the spreadsheet? I am getting lost at the calculation of the Through Power. I do not see where the 0.0023 value is coming from.
@moondog13gmail Жыл бұрын
I loved this explanation and the equations. Thank you for all the time and effort
@mareksp9tkw908 Жыл бұрын
Thank you!!! This is a great video, very informative and has many detailed explanations what and why. 73 Marek SP9TKW
@K9BCM Жыл бұрын
Thank you for putting this video and information together! It has been very helpful!
@willieb6529 Жыл бұрын
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...
@RadioK4RLC Жыл бұрын
Great trip. Inspiring us to go. Where do you access the fire road? Looks like you had a wonderful experience.
@CaptainRadioAdventures Жыл бұрын
The fire road runs parallel to the AT. The trailheads are about 100 feet apart on Catawba Rd in the left side as you depart the parking area. The AT trailhead is to the right. The fire road is much gentler on your knees esp after many miles.
@RadioK4RLC Жыл бұрын
@@CaptainRadioAdventures Thank you. It's on the bucket list. Knees definitely need all the help they can get :-) "A Walk in the Woods" is the movie abt old guys hiking the AT - Robert Redford & Nick Nolte I mentioned. Pretty funny
@CaptainRadioAdventures Жыл бұрын
@@RadioK4RLC just watched the movie you mentioned - it was a good one
@georgetownsend3700 Жыл бұрын
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.
@Shaolin108 Жыл бұрын
Excellent demonstration
@ON6KE Жыл бұрын
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.
@CaptainRadioAdventures Жыл бұрын
Yes the side tone pitch is fixed at 700 Hz
@CaptainRadioAdventures Жыл бұрын
The switches to the right are for the audio filter and the the speaker (on / off). These do work as the audio filter reduces noise. The switch to the left dims the display.
@grantmcduling9760 7 ай бұрын
I recon those small switches being placed under the guard rails get them out of the way nicely as they aren't used that much in the field. I think the radio has been well thought out.
@RadioK4RLC Жыл бұрын
Wonderful Scripture. Wonderful classical guitar. No wonder you're a fine CW Op. God Bless
@CaptainRadioAdventures Жыл бұрын
Thanks for listening
@RadioK4RLC Жыл бұрын
Really nice. Bet he's a gud CW Op also :-)
@CaptainRadioAdventures Жыл бұрын
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 😊
@victorb22622 Жыл бұрын
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
@CaptainRadioAdventures Жыл бұрын
What I mean is you start out long - dip is the low side and start pruning (cutting) until the dip in the SWR is in the region desired.
@bill-2018 Жыл бұрын
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
@jvkew Жыл бұрын
Ecellent!
@kimcampbell9501 Жыл бұрын
Nice video Ariel. Thanks for the WFD activation. W4OSS
@KN4OKadventures Жыл бұрын
I love my TR-35, great radio and did a short POTA activation while hiking the other day. de KN4OK
@greentoptrekker Жыл бұрын
Very nice, and I love the music. Be Thou My Vision is one of my favorites.
@AA0Z Жыл бұрын
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
@CaptainRadioAdventures Жыл бұрын
It hits a nice sweet spot. It has about the same form factor as the MTR. The ease of recording and playback into and from memories for calling CQ is a plus. Power consumption is frugal and better yet - dial back power to conserve it. It will work down to 9.5 V which can milk a Lithium battery down to zero. During the current upward swing of the sunspot cycle - 17m is nice.
@RobMacKendrick Жыл бұрын
I bought it (haven't assembled it yet), after an exhaustive survey of available alternatives. Among the many pluses, and the general acclaim of everybody who has one, is that 17m capability. 20m, except without contests. What's not to love? And also the knobs. Thank you, WA3RNC, for bringing back sane interface design.
@ScottBrown1406_Repair Жыл бұрын
Which QRP radio do you prefer?
@ScottBrown1406_Repair Жыл бұрын
Hi Ariel, I just received my built QCX mini for 20M. Thanks for the info! N2OG Scott
@cwqrpportable Жыл бұрын
You should have built it! It's half the fun....
@thomasrouse1792 Жыл бұрын
Nice Rig Ariel. N0TR
@CaptainRadioAdventures Жыл бұрын
Thanks Tom
@thomasrouse1792 Жыл бұрын
Nice Rig Ariel. Excellent U-Tube. Thanks for posting.
@ON6KE Жыл бұрын
No button to set CW pitch. ON6KE
@CaptainRadioAdventures Жыл бұрын
CW side tone level is set by a potentiometer during the build. The side tone pitch is fixed and if matched to the pitch of the incoming signal it it will be zero beat.
@ON6KE Жыл бұрын
@@CaptainRadioAdventures And by shifting pitch too much you'll end up outside the receiver filter passband, i.e. you won't hear anyone or at greatly diminished signal strength come back to you..
@CaptainRadioAdventures Жыл бұрын
Yes the sidetone pitch (frequency) is fixed.
@owlcricker-k7ulm Жыл бұрын
All my QRP rigs pick up the pops from my phone but I haven't tested the K1
@dsg12345 Жыл бұрын
great video. thanks KI5WKM
@stevegooch2356 Жыл бұрын
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?
@CaptainRadioAdventures Жыл бұрын
The readings should not be that much different between "at" the antenna and 10-15 feet away. You could have a bad coax. Check your coax against a dummy load. It should read 50 ohms.
@stevegooch2356 Жыл бұрын
@@CaptainRadioAdventures -Thanks! for closure, I found an issue with the remote antenna switch that was causing the difference!
@madmax2069 Жыл бұрын
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.
@MidlifeRenaissanceMan Жыл бұрын
That would be Peter Parker. He even does it with a UV5R to decode SSB on 2M VK3YE is his callsign
@N7KOM Жыл бұрын
Nice one! 73!
@tvschooleu 2 жыл бұрын
73 de LZ1KAK!
@thom3124 2 жыл бұрын
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.
@SergeantExtreme Жыл бұрын
^^^^^ This. For those who are wondering what Thom is talking about, I highly suggest you watch this video here: kzbin.info/www/bejne/qqDXqKhqfseUrKc
@lpark8 2 жыл бұрын
Thanks! Great setup. And I had not thought of the Elecraft KX2 battery for the MTR4b - perfect 🙏😎
@thekhakihat3233 2 жыл бұрын
Thats just what I was looking for. Thanks for sharing. AA4K
@whatsgrowingon8099 2 жыл бұрын
Hardening the repeaters only go so far. Without solar or wind generation for a power source to continue operations then the repeaters will fail at some point as the grid power will be down. The solar or wind would have to be shielded as well with EMP Shield.