Redline Communications AN-50e Specifications download pdf (Page 26)

5.3 Additive Noise Effects: The effect of injecting various amounts of noise into the signal was

investigated. This was done at several different levels of signal attenuation. For a fixed level of

signal attenuation the noise power was adjusted by varying the level of attenuation on the front

of the noise source. The results are shown in Figure 5.4. This only changes the amount of noise

added to the signal, and not the power level of the information signal itself.

Interference Testing

Throughput Vs. SNADR

0 5 10 15 20 25 30

SNADR (db)

Throughput (Mbps)

RSSI = -68dbm

RSSI = -63dbm

RSSI = -53dbm

Fig 5.4 Throughput Vs. SNADR based on IP Traffic Data.

otice that the three graphs for different levels o

received power all overlay each other. This shows that the SNR is the determining factor in what level of

throug

hput is possible

5.4 Interference Effects: The effect of interference from another radio source on a different

channel was investigated by having a third AN-50 terminal connected to the RF link. This

terminal constantly is trying to set-up a link with another radio. The radio performed very well

in the presence of interference. Figure 5.5 shows that the throughput only dropped down to 33

Mbps as measured by Iperf in the presence of very strong interference. Note that the RSSI was

only –64dbm as reported by the AN-50 web interface. The interference is much stronger for this

test than was the desired signal. This shows that the filters in the AN-50 do an excellent job of

rejecting out of band interference.

The case of an interferer being in an adjacent and partially overlapping channel was investigated

as well. The results of this test are shown in Figure 5.6. This test shows that even when the

interference occupies some of the channel bandwidth the link is still able to be persistent. This is

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Redline Communications AN-50e Specifications Page 26