Hello. I am watching all the video series you have recorded. Especially those related to RF systems. Please continue like this. I have been doing business in this industry for 20 years but I have a lot to learn from you 🤓
@@viocaia still i don't have test equipments (NanoVNA v.s.) and i learn from you how to measure RF systems. But i will get all these test equipment. Salutări din Turcia
@@waila8200 It's useful when the outer shield of the feeding line is hot with RF so a toroid is blocking RF to reach the miner..In our case there is no need, antenna is in short, the other coaxial collinear designed I've used I plant a ferrite toroid at 1/2 wave length from the feeding point..not necessary with this RAK design..
Very nice, really looking forward to know how it works, I would like to see your final measurements as I have calculated mine but would like to compare before cutting a good piece of coax, I'm mostly interested to know what you have done at the bottom part, that thinner piece that connects to the antenna via that small PCB, did you change the measurement there too , need that measurement too as I think it should be half the length of the elements 114 / 2 = 57 ( 1/4 wave ). thanks.. also I think the original 8dB RAK have 8 elements if not mistaken.
@@viocaia OK, yes the 8 elements is 8 x 114 and the little top piece is basic a termination point, (extra) also makes the antenna DC shorted thus not a necessity to add a lightning arrestor , just ground the antenna and any static discharges will go to ground.
@@viocaia Thanks for your explicative video. How long is that feedline? I don't think it is 1/4 wave... from video seems to be longer than 57 mm (P.S. my gateway is still "dead". More than 20 hours on flat line yesterday)
@@adaniel69 RG11 CATV , similar with LRM400 but for 75ohms...in this case doesn't matter, it's just dipoles anyway, you can use any kind of coaxial cable
@@viocaia think of round waves, the Wave on the feed point is larger than on the Top. So the wavefront is uptilt. In ubiquiti antennas the feedpoint Is in the middle of the Antenna to get easy downtilt.
@@viocaia That does Not Look Good but it is worth a try and it will work …. There are collinear antennas with downtilt and feedpoint at the Bottom but i do Not know now to calculate them,,, there is some Kind of misalignment to make them downtilt
IT was nothing but cutting the top of the antenna, that small element until the right SWR reached, I had to build like 3 new ones , it's a very thin margin of error, once you shorted even 1 mm is gone..a new tip should be made..It's long and boring process..passion is the word..
@@viocaia after several days of trying I actually developed the same technique. I was cutting last 1/4 element of the antenna until I reached good enough swr. I was using design from antenna that you did with RG58 cable. After I was done with shorting (cutting down to correct size) of the last element, I was just pulling in and out copper wire for best swr. Technique to build antenna without soldering is just perfect, probably will cut build time by half and build quality will be much better. I have similar cable and I will try it at evening. Can't wait :D And thank you for doing this and sharing your knowledge with the world. You also inspired me to try to build yagi antenna and I'm in the process of collecting parts.
@@Brdar90 Nice to hear that Milos! Try this last design it's working great..I forgot to draw the schematic, anyway the feed line is 81.1mm..the short thin tube in the video..those 2 pieces of PCB are for mechanical only.
@@viocaia I finished antenna, unfortunately I didn't get good results with the new antenna design but I got amazing results with your old antenna design (one that you created with RG58 cable) . Build quality is very good, and build time is significantly reduced. Can you post schema for the new antenna (antenna from this video) design?
@@Brdar90 I will ..it's very simple fi you follow the video..7x114mm, last one 1/8 wave in short..that's important to tune the antenna to the right swr
Hello. I am watching all the video series you have recorded. Especially those related to RF systems. Please continue like this. I have been doing business in this industry for 20 years but I have a lot to learn from you 🤓
I'm just hobbist and still learning everyday..
@@viocaia still i don't have test equipments (NanoVNA v.s.) and i learn from you how to measure RF systems. But i will get all these test equipment. Salutări din Turcia
@@erhangulcur7475 Mersi de salutari! Good luck mining!
Great work.
And it's working great ! Thanks.
Excellent job bro 👍🏿
Thanks!!
Viorel, why we are not using Ferrite rings as wire noise suppressors ?..are they relevant especially in outdoor antenna installations ?.. thanks
I followed the original RAK 8dB...there are no feritte, antenna i shorted by the last element..
@@viocaia I'm talking in general. Why not use Ferrite noise suppressors? just rings on the antenna wires. Do they help ? thanks
@@waila8200 It's useful when the outer shield of the feeding line is hot with RF so a toroid is blocking RF to reach the miner..In our case there is no need, antenna is in short, the other coaxial collinear designed I've used I plant a ferrite toroid at 1/2 wave length from the feeding point..not necessary with this RAK design..
Very nice, really looking forward to know how it works, I would like to see your final measurements as I have calculated mine but would like to compare before cutting a good piece of coax, I'm mostly interested to know what you have done at the bottom part, that thinner piece that connects to the antenna via that small PCB, did you change the measurement there too , need that measurement too as I think it should be half the length of the elements 114 / 2 = 57 ( 1/4 wave ). thanks.. also I think the original 8dB RAK have 8 elements if not mistaken.
Right..8 elements, I didn't change the feed line, that small piece to N connector is the original..
@@viocaia OK, yes the 8 elements is 8 x 114 and the little top piece is basic a termination point, (extra) also makes the antenna DC shorted thus not a necessity to add a lightning arrestor , just ground the antenna and any static discharges will go to ground.
@@jacoleroux5569 Great configuration..and no arrestor saves some signal..
@@viocaia Thanks for your explicative video. How long is that feedline? I don't think it is 1/4 wave... from video seems to be longer than 57 mm (P.S. my gateway is still "dead". More than 20 hours on flat line yesterday)
@@TaperedWiz Mine to,,dead flat..the thin tube is 81.8mm long
amazing!
Thanks!
Is that a fake RAK 8dbi? I know that the original have 130cm! And what type of cable is that? LMR400? 👍
It's original 8db for US..and cable is something similar with LRM400
@@viocaia i would like to try it too! Can you tell me exactly what type of cable is? Thanks
@@adaniel69 RG11 CATV , similar with LRM400 but for 75ohms...in this case doesn't matter, it's just dipoles anyway, you can use any kind of coaxial cable
@@viocaia ok. Thanks! I will try to replicate your experiment!
@@adaniel69 Let us know..
Good job … but it’s radiation pattern is uptilt …the magic is to have it downtilt
I'm not sure if I understand what you mean..
@@viocaia think of round waves, the Wave on the feed point is larger than on the Top. So the wavefront is uptilt. In ubiquiti antennas the feedpoint
Is in the middle of the Antenna to get easy downtilt.
@@hansmaier3689 I got it..I will just hang it the other way! Good idea! And it's perfect vertical too!
@@viocaia That does Not Look Good but it is worth a try and it will work …. There are collinear antennas with downtilt and feedpoint at the Bottom but i do Not know now to calculate them,,, there is some Kind of misalignment to make them downtilt
@@hansmaier3689 Thanks! I'll read some more about..
Buna ziua,Am o antena wifi de 1.6 m,pot sa o modific in acelasi fel ca in video si sa o folosesc la un miner helium ? Multumesc
Desigur..daca respecati valorile din video ar trebui sa mearga din prima
We want "few hours of tweaking" video.
IT was nothing but cutting the top of the antenna, that small element until the right SWR reached, I had to build like 3 new ones , it's a very thin margin of error, once you shorted even 1 mm is gone..a new tip should be made..It's long and boring process..passion is the word..
@@viocaia after several days of trying I actually developed the same technique. I was cutting last 1/4 element of the antenna until I reached good enough swr. I was using design from antenna that you did with RG58 cable. After I was done with shorting (cutting down to correct size) of the last element, I was just pulling in and out copper wire for best swr. Technique to build antenna without soldering is just perfect, probably will cut build time by half and build quality will be much better. I have similar cable and I will try it at evening. Can't wait :D And thank you for doing this and sharing your knowledge with the world. You also inspired me to try to build yagi antenna and I'm in the process of collecting parts.
@@Brdar90 Nice to hear that Milos! Try this last design it's working great..I forgot to draw the schematic, anyway the feed line is 81.1mm..the short thin tube in the video..those 2 pieces of PCB are for mechanical only.
@@viocaia I finished antenna, unfortunately I didn't get good results with the new antenna design but I got amazing results with your old antenna design (one that you created with RG58 cable) . Build quality is very good, and build time is significantly reduced. Can you post schema for the new antenna (antenna from this video) design?
@@Brdar90 I will ..it's very simple fi you follow the video..7x114mm, last one 1/8 wave in short..that's important to tune the antenna to the right swr