Відео

jaja que los ingenieros no miren el video!!! Importante la calibracion. gracias por tu trabajo.

Don’t worry you’re not the only one. I Cleaned my work table in the garage only to clutter it back up again.

I'm really nervous about Ali Express and counterfeits. I've become more jaundiced against pile-em-high and sell-em cheap merchants. I've seen a lot of really good reviews of the MLA30+ which are on UA-cam I am surprised by the results that you have experienced. I've had massive interference problems at my QTH and ended up as a last-ditch a few years ago going for a Wellbrook loop. Sadly they are no longer in business and the proprietor passed...long story short the design was "copied" by a UK amateur as the "Wellgood" amplifier which may be worth having a look at. I bought one as a backup in case the amp in mine decides to go. The amp is not expensive. I did a short 1:47 video on the differences between a resonant dipole on 60m and my Wellbrook and the differences in s/n are chalk and cheese - I pretty much use my loop all of the time for <10MHz receive with my TS-990 and the FT-2000 that pre-dated it. Not sure if the link will work - ua-cam.com/video/ndJbIpBTLl8/v-deo.html 73 de Richard M0SNR

Where did you get your "shell" or that green frame for the vna in your video thumbnail?

I have 20m of RG-213 which sat on the floor of my garage for 20 odd years. It seems to be working normally but I’ve since got some RG-58. I have ordered my nanoVNA and will look forward to check if this cable has any loss. At the moment it seems neglible.

Thanks a lot for your share !

Please abandon VSWR and use return loss (in dB). You get so much more information, particularly when you have a good match. And do remember that you are measuringa combination of radiation resistance and loss resistance. You don't want to end up matching into a loss resistance.

👍👍👍👍😊😊😊😊

You need to know the impedance at the antenna. To do this, the reference plane must be at the antenna feed and not in the shack.

Thank you very much for your detailed explanation. May I know how to get same cable that you used? From wich srore

Xtra nice video! ~ Very educational! ~ Thank You!

That was very good. You've inspired me to make some coax measurements with my NanoVNA.

I’m confused, why are you looking at matching the coax 50 ohm *impedance* with just the resistive part of the impedance of the LoG antenna? I’m wondering why you didn’t add that to your callcs for the antenna impedance. Or was it a small enough capacitance that it didn’t matter?

Peter Gore Seer, I Have AMLA-30, On A Trio,R-2000, Its North To South, With The Magnetic Poles, Its Working Good And My RF Switch Works At Its Best With Antenna.

When the loop is horizontal, it becomes an omni-antenna with little Near vertical incidence skywave.

Thanks a lot for detailed description! 73!

To 43:00 - 0.77 dB loss is fine because each connector adds 0.1 dB roughly. So, you may have 0.2 dB loss in connectors and 0.57 dB loss in a cable. Which is very close to 0.6 dB/100 ft.

Thank you for explanation. I just want to add than a point with +180 phase degree or -180 phase degree in not a resonance. It's just a point where phase goes more then 180 degree and nothing more. A device is made to show phase degrees whithin a range -179.99 to +179.99.

Twaskyou sr very interesting. Blessings

Calibration, with same connected cable, isn't how is supposed to be. All this connected adapters, cables - must be removed before calibration. After, you need to set electrical delay (port extension), to each of those connected adapters/cables

Good video. What you did is not really different from what I have seen on other videos. So, I think you are safe providing good information.

4:41 Hi, great job! I saw You turning the SMA connector into the SMA nut, You should always turn the nut and not the adapter. if You turning the Adapter, it is rotating in the connector, this will damage it over Time. 73 de DL1LEP

Thank you very much for this very informative video Gregg. Have a nice Easter weekend, PA0CMU

You can also use a spectrum analyzer and tracking generator

Great video!

Great information! You andwered my questions in the first 3 minuits. Thx. W6rch

Seems like the test fixture should be used in the calibration of the VNA.

The phase going from -180 to +180 doesn't mean anything - the phase is linear (has a linear slope to it), it's just if you keep plotting it without resetting it at some point, you end up with phase angles above 360* which ceases to mean anything, or is hard to work with. So the rule of thumb is you graph phase from -180* to +180*, and if it goes below -180 or above +180, you wrap over to the other side. Also, the phase being positive or negative has nothing to do with it being capacitive or inductive - it's not on the same scale as a smith chart. The phase plot has absolutely nothing to do with capactiance or inductance, only delay.

Good video, Gregg. My video on the LoG was among the first on You Tube and I have been using it for several years with very good success. That said, it was NOT a success at my late father's QTH, as a pesky noise source rendered the LoG ineffective. Your video echoes his experience with this design. The LoG is certainly an antenna worth trying, but as in life, there are no guarantees. Thank you for posting this (to give the other side of the coin) and 73! de WX0V

Hi Gregg, a suggestion... Instead of metal nails into frozen ground (i.e. highly conductive!), Try using plastic stakes. You may need to drill a few holes into the frozen ground, but I think you may find the nails are inducing the ground noise. I can't really duplicate your issue here in the desert - haha...😆 73

Gregg ... Nice video coverage and method reviewing your results Sir! I too tried this same type of loop at my location and came to the same conclusion as you. I do have a noise canceller that I think I might give a spin in the future. Thanks again! 73 - KF6IF

Curious to see if the loop on the ground would be more effective if you were comparing it to a vertical antenna. Thank you for the video.

Are you mastering your videos in HDR?

i put it 2 meters up and defased it with a rod antenne on a corner , -135 dBm noise floor , at night 80 m perfect , daytime 20 , 40 meter ok.

I like any program that take up the issue of Nano vna😊😊😊😊😊😊😊

At least lowering the antenna shifts the resonance down, which makes sense.

Your metallic mast may be interfering with your setup. Generally, a dipole is mounted with non-metallic (dacron etc.) lines or a fiberglass pole.

If you change the stimulus , you should recalibrate ... every time.

Just buy a circular polarisation filter for the camera, takes the glare out of anything. en.wikipedia.org/wiki/Polarizing_filter_%28photography%29

Very interesting indeed😊

Ett fantastiskt this calculations you do😊😊😊😊😊😊😊😊😊😊😊

Code 102 means 1000 pF, not 100 pF

Very nice demo. I was about to do the same test. One thing I noticed, and it may be minor, is that you held onto the back allegator lead which may have induced some hand capacity in the measurement. Even though it was the black shielded allegator clip it still could have some effect.

Nice demonstration, not to complicated to follow along with. Nice job 👍 KN6JHC

My MLA-30 redeemed itself too, recently bought another HF rig with dual receivers so with headphones you can listen in "stereo" with two antennas, one on each receiver. Sometimes the more readable signal is from the MLA-30, my noise levels are often very high on 40m, both with a 1/4 wave vertical and low dipoles. The MLA-30 is going to get some attention, probably a slightly larger loop and a decent mounting further from the house, they don't measure well for dynamic range but a great basis for some experimentation. FWIW I had already reduced my noise levels substantially with the combination of a current balun in the HF feeder to the main antenna and common mode choking of the electricity supply to the entire shack. 73

New tool in my box. Thank you.