DAVIS Wireless Repeaters for VP2 Manual de usuario descargar pdf (Pagina 12)

25 - 12 Rev A 7/28/06

Determine whether you can use all Yagi antennas in your network. If any of the situations

below apply, you may use table on page 16 to determine your minimum repeater requirements.

• If you have one weather station and one receiver.

• If you have more than one weather station or more than one receiver, and they all fall

within 25° either side of your proposed transmission path centerline.

• If either your multiple weather stations or multiple receivers are spread far enough apart

to require the use of multiple chains

o And they all fall within 25° either side of the transmission path centerline.

o If any of them do, you can use all Yagis in those particular chains. Add the

repeater requirement results from each chain together to get the total number of

repeaters required for those types of chains. Any that don’t are covered in the

next section below.

The 7656 high-gain Omni antenna is similar to the dipole since it performs best and equally well

in all directions around the antenna. However, it is has higher performance compared to the

dipole. Its transmission distance is 1.58 times better than the dipole. The main disadvantages

of the high-gain Omni over the dipole is that it cannot be rotated to an angle and it performs

even worse above and below the transmission plane than the dipole does. Another antenna

can only be about 20° above or below this horizontal plane before the performance begins to

seriously degrade. When you pair a high-gain Omni antenna with a dipole antenna, you can

achieve a maximum transmission range of 1580’ (475 m). When paired with another high-gain

Omni, the distance increases to 2500’ (750 m). This antenna is best used when a repeater is

receiving multiple transmitters that are in very different directions relative to the antenna, or

transmitting to multiple receivers that are in very different directions relative to the antenna.

1 2 ... 7 8 9 10 11 12 13 14 15 16 17 18 19 20

Sin comentarios

DAVIS Wireless Repeaters for VP2 Manual de usuario Pagina 12