Parabolic antenna for receiving satellite TV transmissions attached to the wall of a wooden house. DBS TV - Direct Broadcast satellite television, also known as "Direct-to Home television" (DTHTV), allows reception with parabolic antennas. The satellite signal is a weak signal from a long distance that can be received with a satellite dish. The antenna reflects the signal at the focal point where a device called a "feedhorn" (waveguide) is mounted which leads the signal to the receiving element, called a "low noise block" (English: low-noise block - LNB or low noise-converter LNC). There are two types of parabolic antennas, called "offset" and "prime focus". Offset antennas: have the LNB receiving element located eccentrically to the center of the antenna, in a secondary focus they generally have a diameter of up to 1.8m. Prime focus antennas: the LNB is located in the center of the antenna in the main focus they are larger, 3m, or even 3.5m in diameter.
圖片編號:
317569549
拍攝者:
Rechitansorin
點數下載
授權類型 | 尺寸 | 像素 | 格式 | 點數 | |
---|---|---|---|---|---|
標準授權 | XS | 371 x 480 | JPG | 13 | |
標準授權 | S | 618 x 800 | JPG | 15 | |
標準授權 | M | 1521 x 1971 | JPG | 18 | |
標準授權 | L | 2007 x 2600 | JPG | 20 | |
標準授權 | XL | 2485 x 3219 | JPG | 22 | |
標準授權 | MAX | 3043 x 3942 | JPG | 23 | |
標準授權 | TIFF | 2838 x 3677 | TIF | 39 | |
進階授權 | WEL | 3043 x 3942 | JPG | 88 | |
進階授權 | PEL | 3043 x 3942 | JPG | 88 | |
進階授權 | UEL | 3043 x 3942 | JPG | 88 |
XS
S
M
L
XL
MAX
TIFF
WEL
PEL
UEL
標準授權 | 371 x 480 px | JPG | 13 點 |
標準授權 | 618 x 800 px | JPG | 15 點 |
標準授權 | 1521 x 1971 px | JPG | 18 點 |
標準授權 | 2007 x 2600 px | JPG | 20 點 |
標準授權 | 2485 x 3219 px | JPG | 22 點 |
標準授權 | 3043 x 3942 px | JPG | 23 點 |
標準授權 | 2838 x 3677 px | TIF | 39 點 |
進階授權 | 3043 x 3942 px | JPG | 88 點 |
進階授權 | 3043 x 3942 px | JPG | 88 點 |
進階授權 | 3043 x 3942 px | JPG | 88 點 |