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K_horse
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That is true, but I do not know how. Nor do I know how to determine what the impedance of an antenna currently is. This information is kept secret?
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Yes I've seen that thread before, it has a ready made design from the admin which works well for reception. But it does not explain anything or answer my questions. double biquad is for sending, not reception, i want to know its impedance so that I can broadcast with best pattern. I can't have power lost from a radiating coax.
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I have that software now, i'll learn to use it. Seeing that the impedance is 50 ohms makes me wonder about another antenna I made, this one for broadcasting, specifically channel 23 (487Mhz). I don't know what it's impedance is. Most biquads I see people make are 2.4Ghz ones with direct connection to coax, don't know how everything changes when whole antenna is nearly 90cm wide.
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Thanks for simulation, what program is that? outside gap between squares is 36mm, at that place strip is 20mm wide, otherwise 31mm I don't know how to calculate impedance. Want to try and get 300ohms, because I have a lot of 300-75 ohm baluns
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would be aluminium plate, with reflector
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Hello there, I'm making Biquad antenna for UHF TV in North of england, the winter hill transmitter, uses channels 29-55 or frequency range 538 to 754Mhz. Distance is about 30 kilometers, 100kW, and antenna will be used indoors. I haven't made it yet, but I drew it using measurements from online calculators, with smallest and biggest channel together, + a little extra (Channel numbers move a lot). Can someone look at it, make sure it is correct? What would impedance be? I have a lot of 300 to 75 ohm balun, if it needs one. thanks