Home |
Search |
Today's Posts |
#15
|
|||
|
|||
The nature of Free Space (Once called, "The Lumeniferous Aether")
On 9/11/2015 10:58 PM, gareth wrote:
"rickman" wrote in message ... On 9/11/2015 1:48 PM, gareth wrote: "rickman" wrote in message ... There is no contradiction there. Current is not power. Power is voltage times current. Since the impedance of a short antenna is not the same as the impedance of a larger antenna, it makes perfect sense that the current for a given power level will not be the same. Feed 1kW into your 472kHz antenna and get only 1W erp, most of the high current driving the ohmic resistance and not the radiation resistance You have had this discussion with many others here before. What is your point? The point I was making was a courteous reply to you. I'm talking about the technical point. Your reply doesn't have much technical merit about the question you were originally asking. You snipped the part I was replying to. Therefore, to achieve the same radiated power from a short antenna, the current in the antenna has to be higher. My point is that the current is not relevant in the theoretical case. The ohmic losses you are talking about have to do with the construction of the antenna, not the geometry. Make an antenna from a super conductor with no ohmic losses and you will see the same power radiate from both a short or a long antenna given the same power input to the antenna. There is my courteous reply to you, and fully on topic. Can you give a valid technical reply about that? -- Rick |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
When can a radio be called "vintage"? | Boatanchors | |||
More Corporate Welfa "CONservative Capitalist "Free Market"Laissez Faire Republican Hypocrite Talk Radio Flunkies Silent As TaxpayersBail Out AIG With $85 Billion | Shortwave | |||
What's in a "wall wart" so-called "transformer"? | Homebrew | |||
Nature of "ground" beneath my house? | Antenna | |||
Why Is a Ship Called: "She"? :-) | Boatanchors |