A.H. Systems SAS-521-2 Manuel d'utilisation - Page 9

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A.H. Systems SAS-521-2 Bilogical Antenna

OPERATING INSTRUCTIONS

Once the antenna is mounted to a mast or tripod, connect an N-type coaxial

cable from the antenna to a receiver or RF generator. The cable should be

matched to 50 ohms, relatively low loss and adequately shielded against

leakage such as RG-58 or better. For certain applications where an increased

dynamic range is required, an optional preamplifier (PAM-0202) may be used to

increase the total system sensitivity.

The Bilogical Antenna is in the horizontal polarization when the antenna

elements are parallel to the ground, and vertical polarization when the elements

are perpendicular to the ground.

To minimize impedance mismatch errors, it is recommended that high-quality

in-line attenuators be used to reduce reflections. Connect the attenuator at the

antenna end of the transmitting cable, or when receiving connect the attenuator

at the measuring instrument or preamplifier input.

Dress the cables straight back from the antenna connector at least 1 meter

before being dressed vertically down to the ground plane. Signal cables that

are dressed orthogonal to the antenna elements will have minimal coupling to

the antenna field, but the cable shields may carry external currents caused by

impedance imperfections. Also, portions of the cables that are not straight down

or straight back will couple to the antenna fields.

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