4RF Aprisa XE, Руководство пользователя

Страница: 38 / 272

Mounting and installing the terminal | 37
Bench setup
Before installing the link in the field, it is recommended that you bench-test the link. A suggested setup
for basic bench testing is shown below:
When setting up the equipment for bench testing, note the following:
ƒ Earthing—the terminal should be earthed at all times. The terminal earth stud must be connected
to a protection earth.
ƒ
Attenuators— In a bench setup, there must be 60 - 80 dB at up to 3 GHz of 50 ohm coaxial
attenuation (capable of handling the transmit power of +35dBm) between the terminals’ N type
antenna connectors.
This can be achieved with two fixed attenuators fitted to the antennas 'N' connectors and a
variable attenuator with a
≥ 60 dB range. You can use other attenuator values as long as you
consider the transmit power output level (max +33 dBm) and the receiver signal input (max -20
dBm).
ƒ
Cables—use double-screened coaxial cable that is suitable for use up to 3 GHz at ≈ 1 metre.
Caution: Do not apply signals greater than -20 dBm to the antenna connection as they can damage
the receiver.