National Datacomm InstantWave NWH660 User Manual page 66

Transmission
performance is slow or
erratic.
66 InstantWave
11-Mbps Wireless Access Point
1. Change the direction of the antenna slightly.
2. There may be interference, possibly caused by a
microwave oven, 2.4-GHz wireless phone, or metal
objects. Move these interference sources or change
the location of the wireless PC or AP.
3. Change the wireless channel on the NWH660.
4. Check that the NWH660 antenna, connectors, and
cabling are firmly connected.