DIY 868/917 Mhz LoRa collinear coaxial antenna 7.8db part I. For tests and calibration check part II
Пікірлер: 27
@vasquezitosanchezito2 жыл бұрын
Nice antenna!
@viocaia2 жыл бұрын
Yes it is! And working great..
@viocaia2 жыл бұрын
Before testing I covered the wrapped elements part with solder, to avoid any coil effect.Just a regular shield.
@billysgeo2 жыл бұрын
Very nice video and explanation. Aslo your audio is very good. However I would like to see a bit more light in your videos.
@viocaia2 жыл бұрын
Thanks! Good idea with more light..About SWR I ordered and SDR radio and I'll try some tests.So far is working great but I don't have a compare to..the original is no way to reference.
@viocaia2 жыл бұрын
Just reached 45Km with it
@alenramic50772 жыл бұрын
@@viocaia Very nice. Just one question. That feeding part of telescopic antenna (half length of one antenna part), you stripped down outer insulation of coax cable and just pulled that tube over braided shield, is that right?
@viocaia2 жыл бұрын
@@alenramic5077 You don't need to take the plastic off..just open lik 5mm of shield and solder to the tube
@alenramic50772 жыл бұрын
@@viocaia thx for quick answering. So just to strip down e.g. 5mm of shield and solder braided shield to tube.
@stefanceparu76422 жыл бұрын
Thank you very muck for your videos! What is the influence on the antenna if you use higher diameter coax? Will it be better?
@viocaia2 жыл бұрын
I really don't know, important is the velocity factor which is different from cable to cable..this RG58 clone was like .86 instead of a good quality RG..which is .66. Probably a good quality cable will do a better job..consider the radio waves traveling at the surface of the cable not inside the core..
@xIRFOx2 жыл бұрын
according to the table i found at wiki, VF of RG58 is 0.81 . Because of that you changed the size of elements in Part 2? Can you tell me how to calculate size of parts, if you have other type of coaxial cable, to get 868Mhz?
@viocaia2 жыл бұрын
Exactly...my first attempt was done considering 0.66 for RG58, totally wrong..
@viocaia2 жыл бұрын
I can say the antenna is working great , sending beacons more then 60km..way better then the standard 3db..
@viocaia2 жыл бұрын
I use this page for inspiration jeroen.steeman.org/Antenna/collinear-coax
@xIRFOx2 жыл бұрын
@@viocaia Thank you. I dont have network analyser but Ill try to make one and we will see how will it operates. Did something similar for wifi antena but I had calculation for that. This will help, thanks again
@viocaia2 жыл бұрын
@@xIRFOx Just follow the design from part 2 and it's working for sure.Be careful not to short the dipoles..check with a multimeter each segment after you do solderings. Good luck!