DN200 User Manual Rel 1.0
Path Loss
-110 dB
propagation loss between transmit antenna and receive
antenna highly variable - shown as a -ve gain. Depends
on the frequency and number and type of obstructions
within the Fresnel zone within the Fresnel zone of the
propagating wave. See path loss graphs.
Receive Antenna
Gain
10 dBi
antenna data - see above
Receiver cable
loss
-2.5 dB
shown as a -ve dB gain. See transmitter cable loss.
Receiver
threshold
-80 dBm
the minimum signal level required for a specific
throughput and bit-error rate. The threshold at the
higher throughput levels achievable in 802.11n systems
is significantly higher than required for 11 Mb/sec.
Noise is also a consideration when figuring the receiver
threshold. (i.e. Noise floor is 75dBm, that will be your
receiver threshold since it’s the higher number)
CALCULATED
VALUES
Receive Signal
Level
-79 dBm
the signal power delivered to the receiver input
Path Margin
1 dB
this is the difference between the Rx signal and the Rx
threshold.
a reasonable margin (10 dB) is essential on a wireless
link to allow for variation of path loss. The margin may
be reduced if diversity antennas are used or MIMO
operation is possible
