ADTRAN TRACER User Manual page 38

P 28
AGE
S 2
ECTION
3.
This equipment is authorized under CFR 47 Part 15.247. With
this authorization by the FCC, this equipment shall not be co-
located with a similar transmitter that transmits identical
information.
A A
NTENNA LIGNMENT
After the transmitter power for each end has been adjusted and
the BBP and RFC have been installed and connected, the antenna
should be connected to the RFC via the feedline. The antennas
should be aimed toward one another as precisely as possible and
the received signal strength indicator (RSSI) voltage measured.
The RSSI voltage is a function of the signal strength at the receiver
and is used to measure the received signal strength. RSSI varies
approximately from 0 to 4 volts, with 0 volts corresponding to a
weaker received signal and 4 volts corresponding to a stronger
received signal.
RF L
OW
The "RF Low" LED indicates that the received signal is within
10dB of the minimum received signal strength (~-80 dBm). If
this indicator is on, the link performance may be marginal. The
antennas should be peaked in azimuth and elevation until the
desired signal level is achieved. RSSI may be monitored on either
the RF unit or the front of the BBP . If the received signal is too
strong and RSSI reaches a maximum such that the peak cannot be
discerned, then the transmitter on the far end should be turned
down.
At this point the radio link should be operational. Proper operation
can be determined by the status of the "LINK ERR" LED. If this
LED is on, the link is not operational. If this LED is not on, the
link is operating. Certain types of interference can cause one end
of a path to operate and the other end to fail. In some instances,
this may be corrected by swapping the frequency plan at each
end, thus avoiding the interference if it is stronger at one end
If the systems are from different manufacturers, set the transmit
frequencies as close as possible with different spreading codes.
Other manufacturers may not use the exact frequency plans as
the Tracer system, but keeping the frequencies close will reduce
the probability of the transmitter(s) interfering with the co-
located receiver(s).
61280.003L1-1B
4/12/99