Hello Paolo, Great information. I made the antenna with you tutorial. and it works very well. The only thing I did was that I used small copper cable (just like the R58U) I wander i've it is better to use the RG213 cable. The results are very good at this moment, but it's nice to try a second one. :-)
It shouldn't. Think of the velocity factor as a measure of "slowing down" the speed of electromagnetic waves in the given cable. E.g. VF=0.8 means that the speed of EM waves is 80% of the speed of light in vacuum. This also means that the length of the individual coax pieces of the collinear should be shortened by this factor because in a given "time slice" the wave can only propagate a shorter distance in the coax.
@@CBRadioWayBack10-4 Actually it does not matter. Can be shortened, can be left open, can be terminated with a resistor, can be done anything, the differences are miniscule.
Hello Paolo, Great information. I made the antenna with you tutorial. and it works very well. The only thing I did was that I used small copper cable (just like the R58U) I wander i've it is better to use the RG213 cable. The results are very good at this moment, but it's nice to try a second one. :-)
Many thanks for feedback
The centre core is connected to the (woven) copper shield not the dielectric which is the inner insulator.
Great Video! Thank you. Is there a part 2?
No there isn’t, the tittle is wrong I must cancel the Word Part 1
Thank you for tutorial. Could you please specify the connector spec and link?
You must use a 50 ohm connector like a N or PL259
The original article of my station tuttoilmondo.it/flightradar-24/
Hi Paolo, fantastic video. Please what is gain this project? Tks 73. Rosendo - PS8RSA
about 7 db
Wouldn't you get 3db gain from each pair, giving 6db for 2 pairs (4 sections)? Also, you can double the number of stages for twice the gain.
Shouldn't it be L = 0.5 x wavelength / velocity factor? 🤔
It shouldn't. Think of the velocity factor as a measure of "slowing down" the speed of electromagnetic waves in the given cable. E.g. VF=0.8 means that the speed of EM waves is 80% of the speed of light in vacuum. This also means that the length of the individual coax pieces of the collinear should be shortened by this factor because in a given "time slice" the wave can only propagate a shorter distance in the coax.
@@laszlokovacs4322 Makes sense, thanks.
Better use 75 Ohm Sat Cable
I am trying with it (75 Ohm) since I have no CNT400 cable at hand, but result is too poor.
is last piece coax open or close (shorted) ?
looking many video and picture but unsure if end is open or close ??
Did You watch the electric diagram ? OPEN
@@PaoloTuttoilmondo yes i see yours..
others say short, some even have 1/4 open and 1/4 'whip' on top like T2LT/Sleeve dipole
so some site confusing.
@@CBRadioWayBack10-4 Actually it does not matter. Can be shortened, can be left open, can be terminated with a resistor, can be done anything, the differences are miniscule.
@@laszlokovacs4322 ok thank you, i was not sure as many people say different and no one says which is correct..
thank you.