3 x 1/4 = 3/4 not 5/83 times will work but its called 5/8ths because there is an electrical end effect that means you must cut it shorter.
Only confusing because you're looking at a circuit without basic understanding of reactance and impedance.Confusing .
A "Collins Receptor" .... haha. I met the guy who designed it. He was a con-artist. Just not a very good one. He was too convinced of his own importance without results. While his antenna works (he used to get very pissed if you called it an "antenna") it's just another shape feeder like a dipole, or a quad, or a slot or any other combination inductive and cross field antennas.I heard of an "H" pattern antenna which was resonant on all frequencies up to a point but I could not get one to work. I found one on a TV antenna and I'm convinced it was a con.
3 x 1/4 = 3/4 not 5/8
5/8th works not because of the velocity factor.
If this were the case you would have a velocity factor that changes with frequency.
Still not up with the basic laws on the universe tytower ?
Only confusing because you're looking at a circuit without basic understanding of reactance and impedance.
Sounds like you have a gripe for anybody who has put the time in at university and actually bothered to make an effort to learn or conduct valid research.You are another of these " I know everything" types who can't but pick on everyone else's posts .
Which is what you're doing. For anybody who is not familiar with the subject, you're filling their head with ****. It's then up to the rest of us to clean up your mess."Confusing" is to anyone looking at it as a learner !
You've got some real issues there tytower.
Sounds like you have a gripe for anybody who has put the time in at university and actually bothered to make an effort to learn or conduct valid research.
I don't pick on anybody else's posts. I stick with what I know and what I'm good at.
I would suggest rather than posting incorrect information about subjects you think you know something about and clearly don't. Rather then getting embarrassed when other people (not just me) correct your mistakes, that you learn from your mistakes. Not try and blame others for highlighting your stupidity.
Which is what you're doing. For anybody who is not familiar with the subject, you're filling their head with ****. It's then up to the rest of us to clean up your mess.
Still got some issues there tytower. You know (and I've said it many times before) that I treat every post of yours like it's the first and disregard all the stupid **** you've said in the past, unless it's on topic.Most of what you have to say is a ***** at me .
With respect to a VHF output transistor. To even suggest something simple like a 2N2222A was too hard.Errr---Use a black one
My advice to the readers is to check anything you say. You have a history of saying stupid **** and giving people incorrect information.Wake up , stop the constant attack and get on with it elsewhere .
For any other readers if you are making a Yagi look carefully at what I have said above . I've made and used quite a few
I am trying to build a Yagi antenna for 900mhz and I am using this formula:
**broken link removed**
Length:
Reflector length = 0.495 x wavelength
Dipole radiator = 0.473 x wavelength
Director D1 = 0.440 x wavelength
Director D2 = 0.435 x wavelength
Director D3 = 0.430 x wavelength
----------------------------------------------
Spacing:
R-DR = 0.125 x wavelength
DR - D1 = 0.125 x wavelength
D1 - D2 = 0.250 x wavelength
D2 - D3 etc = 0.250 x wavelength
--------------------------------------------------------------------------------------------
But the problem is, when I use this formula with 900mhz the antenna ends up being huge. What I need to do is make it smaller. Would it work if I took all of the lengths and spacings then divide it by, say four?
I don't quite understand the question. Is it a standard dipole, or a folded dipole and how are you feeding it ? Balun or gamma match etc ?1. I should have to feed rf in two ends of dipole rediator only, isn't it?
No, it doesn't. I am not aware of how it effects the performance. It's something I have not considered for a long time.Does it should have to be conductor?
This depends on your application.It is too much directional antenna with high gain.
It only transmits in one direction.May I know, in which direction it can transmitt?
Mount it straight on a pole like a TV antenna (which are usually yagis).And how to stand this Yagi in the sky to transmit horizontally?
This depends on your transmitter impedance, coax impedance and driven element.Impedance matching Balun (75 ohm - 300 ohm) is necessary for Yagi too, isn't it?
I'm not sure why you consider this antenna too big ?
Too wide or too long ?
If it is too wide, then you can halve the wide by using a loop yagi or a quagi.
If it is too long, then switch to a phased array of short yagis.
I don't quite understand the question. Is it a standard dipole, or a folded dipole and how are you feeding it ? Balun or gamma match etc ?
No, it doesn't. I am not aware of how it effects the performance. It's something I have not considered for a long time.
This depends on your application.
It only transmits in one direction.
Mount it straight on a pole like a TV antenna (which are usually yagis).
This depends on your transmitter impedance, coax impedance and driven element.
Is this antenna for receive only, or transmit and receive ?
What sort of transmit power ?
How dipole determines the direction (only 2 direction?) if I keep it vertically. Which two directions has strong signal? All FM stations has dipole but how they are transmitting all around the area??
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