Try connecting the NanoVNA to a computer via VNA Saver. You can do higher resolution scans and save the graphs as images and insert them into the video directly. Even annotate them.
Pretty sure the holes are where you can strap the cable down with a zip tie. I've got a similar antenna that came inside a housing and was attached that way.
Great video! Is it possible to design "log periodic antenna" for two bands, example 800-900Mhz and 1700-1800Mhz if frequencies between is not in your interest? Aiming of course keep the boom length reasonable with most gain on those two bands.
How about opening the insulation and soldering the coax only where it intersects each element? What would be a good functional test? I’ve tried using Vistumbler with various 2.4ghz/5ghz antennae to see the number of access points I can reach with one antenna versus another. Quick note… I vote for the return of story time and IMSAI Dog. Have a good day!
One IMSAI Guy's journey through aliexpress to find the best antennas in the land! Does your NanoVNA have an ability to screen capture into a computer or USB stick or similar? I'm not sure if you have a video on it already, but I'd be interested to know why your HP thinks it can get to 15-20 -dB whereas the nano was only reporting around 10.
Keep at it, love your videos. Keep in mind that the Nano VNA is feeding square waves into the antenna and wasn't able to replicate the readings common to your expensive machine.
It would be interesting to see, how efficiently this antenna really performs at the high end of the specified band. The PCB material seems to be standard FR4, which gets increasingly lossy above 1-2 GHz.
gramps has got to tell us how everything works! he's the only 1 that can calibrate the machine! *the oppositional reluctance dipole antenna* ! never heard of one! I'm sure it works 4 the Union ! good luck Pat.
The only way the soldered down coax could work is if that buss was connected to the shield. If it was connected to the center conductor that operation would leave you with .. not much.
I'm not sure why Yagi is in the title - it is certainly not a Yagi - just adds more confusion. It looks a bit like a log periodic, but until we see directivity and front-to-back ratio, perhaps we should categorize it as Just-a-Bunch-of-Dipoles. It would not surprise me if directional performance is very poor and it's a complete fraud. EDIT: (Mark subsequently corrected the title, removing Yagi)
I would call that a "logperiodic looking object" which does not do what it's supposed to. the elements are on top of each other, no interleaving, not a logperiodic.
@@IMSAIGuy wow, I stared at the end where there was closeups and thought there was copper under each of the silkscreen legs, quite hard to spot that detail
you can use antennas designed for cars, or put a wire antenna under the eves of the roof, or in the attic. search around, there are thousands of people who have tackled that problem.
the shorter wavelength will choose the short dipoles if fed correctly, if fed from the other end then the short wavelengths will find long dipoles and odd things will occur.
@@IMSAIGuy I have about 8 satellite dishes installed that I poke around the sky with. Hoping to get back to it soon. It's like SWL but higher frequencies. 73 Leo
it won't work right. the shorter wavelength will choose the short dipoles if fed correctly, if fed from the other end then the short wavelengths will find long dipoles and odd things will occur.
actually the PCB designs are made to operate at 50 ohm and get better than 10dB across the range. There are several papers on line. They are supposed to have a soldered down coax. I will need to take off this silly connector and give it a try
@@IMSAIGuy The balun (and matching) network are etched on the pcb The holes, in the pcb, are part of the matching network... and a possibly for implementing 'opens.' There a similar Chinese design... to the one you show... that uses a conductor backed coplanar waveguide to match.
@@willthecat3861 How can the holes have an effect when they are outside the copper plated parts? Or has this PCB really more than 2 layers? (Shining light through most cheap PCB antennas shows that they don't.)
Wonder if you could put two PC boards together, at 90-degrees to each other, receiving both H and V polarizations? Would they be phased at 0 or 90 or 180?
