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October 2nd 15, 04:41 PM
posted to rec.radio.amateur.antenna
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Short antennae are poor radiators - a simple illustration.
wrote in message
... On Wednesday, September 16, 2015 at 7:59:00 AM UTC-5, gareth wrote: By their very nature, short antennae are standing wave antennae and not travelling wave antennae. Consider the standing wave that is apparent when the incident wave arrives at the open end of the antennae. In the case of at least 1/4 wave antennae, the standing wave exhibits the full quadrant of a cycle, but in the shorter antennae, there is less than a full quadrant, and it follows that because not the full quadrant appears on the antennae, then they do not radiate from that full quadrant. Your car wears it's tire mittens, yet sputters at porch lights due to excessive carbon buildup on the various intake valves. The carbon expands as it heats up, and then the valves refuse to seal, which leads to a loss of compression, which leads to a poor operating ability as it passes go to collect it's $200 while operating 3A at field day. I asked my cat what is likely the cause for this peculiar phenomenon, and it laughed at me and pointed to the northeast. Sorry, looks like random garbage to me. |
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