| Home |
| Search |
| Today's Posts |
|
#18
May 31st 12, 03:38 AM
posted to rec.radio.amateur.antenna
|
|||
|
|||
Hopefully not off topic
On 5/30/2012 12:42 PM, Channel Jumper wrote:
'Jeff Liebermann[_2_ Wrote: ;791197']On Tue, 29 May 2012 19:12:00 +0200, "Szczepan Bialek" wrote: My HT antenna isn't grounded. Neither are any of the dipoles on my roof. I presume you're suggesting that they don't work. -- With a Hand Held Radio - the person holding the transceiver is the ground plane. Because the human body is comprised mainly of water, it acts like the missing half of the antenna. Radio waves in front of the person is radiated, radio waves behind the person is blocked to a small extent because of the water in the persons body. This is the reason why Rabbit Ears antenna's do not work in concrete apartment buildings with people moving around the room. The person who is walking around blocks some of the reception - especially in the higher frequency ranges because anything one or more wavelengths in size can and will block a signal. Not quite right, since you don't have to actually "block" the signal for it to happen, but Mr. Blaupunkt wouldn't have a clue anyway. It's more about the whole wavefront, amplitude of the parts of same, phase, and interaction with the surrounding conductive and absorptive environment. Some of which can be alive, filled with salt water, and move. tom K0TAR |
| Thread Tools | Search this Thread |
| Display Modes | |
|
|
Threaded Mode
