G-Way Microwave / G-Wave PCSHW70A 사용자 설명서
DIAGNOSTICS GUIDE
The Mini-BDA provides long term, care-free operation and requires no periodic
maintenance. There are no user-serviceable components inside the Mini-BDA.
This section covers possible problems that may be related to the installation or
operating environment.
maintenance. There are no user-serviceable components inside the Mini-BDA.
This section covers possible problems that may be related to the installation or
operating environment.
a. Gain Reduction
Possible causes: Bad RF cables and RF connections to antennas, Damaged
antennas.
antennas.
b. Excessive Intermodulation or Spurious
Possible causes:
Amplifier oscillation caused by insufficient isolation. The isolation between two
antennas is given by the equation:
Isolation = 92.5 + 20 Log (F x D) – Gt – Gr
Where:
F = frequency (GHz)
D = separation (Km)
Gt = transmit antenna gain (in the direction of the receive antenna).
Gr = receive antenna gain (in the direction of the transmit antenna).
For the SMR frequencies, the antenna isolation at 100 m separation is about 71 dB
for omni-directional antennas (0 dB gain). To increase isolation, the antennas should
have higher directivity and must be pointed away from each other.
Amplifier oscillation caused by insufficient isolation. The isolation between two
antennas is given by the equation:
Isolation = 92.5 + 20 Log (F x D) – Gt – Gr
Where:
F = frequency (GHz)
D = separation (Km)
Gt = transmit antenna gain (in the direction of the receive antenna).
Gr = receive antenna gain (in the direction of the transmit antenna).
For the SMR frequencies, the antenna isolation at 100 m separation is about 71 dB
for omni-directional antennas (0 dB gain). To increase isolation, the antennas should
have higher directivity and must be pointed away from each other.
c. Occasional Drop-out of some Channels
Possible causes: One channel with very strong power dominates the RF
output of the amplifier.
output of the amplifier.
15 Ron’s Edge Road
Springfield, New Jersey 07081
Tel. 201-343-3140 Fax 201-343-6390
sales@gwaverf.com
www.gwaverf.com
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