AVTECH Software, Inc.
Page 4
AVTECH.com
Wireless Sensor Hubs (RAW-PWSH-HUB & RAW-WSPR-HUB)
Metal
Keep the WiSH/WiSPR and Room Alert antennas as far away from metal objects as
possible. If metal is too close, it can interfere with the way the antennas radiate the
signal. Provide at least several inches of separation between the antennas and other metal
objects.
Obstructions
With a clear line of sight from Room Alert to the WiSH/WiSPR, the wireless range can be
up to 250'.
However, each obstacle between Room Alert and the WiSH/WiSPR reduces the effective
range of the wireless signal. Obvious obstacles include brick walls, drywall, doors, floors
and ceilings. Less obvious obstacles include people, desks, bookshelves, cabinets, wind,
plants or trees and more. Each of these obstacles will reduce the effective range of the
wireless signal.
The table below lists common obstacles and the approximate effect on the wireless signal
range.
Obstruction
Effect On Range (Feet)
Brick Wall
40-50'
Drywall Wall (Steel Studs)
15-25'
Drywall Wall (Wood Studs) 10-20'
Door (Solid Core)
10-12'
Door (Hollow Core)
5-7'
Cubicle Wall
3-5'
People
1-3'
To determine the maximum effective wireless range in your environment, subtract the
maximum effect of each obstacle from the maximum range, 250'.
For example, if there is one brick wall, two drywall walls and three solid core doors
between Room Alert and the WiSH/WiSPR, the maximum effective range would be
approximately 114' under ideal conditions:
250' – (1 x 50') – (2 x 25') – (3 x 12') = 114'
In this case, the WiSH/WiSPR should be moved within the 114' of Room Alert. Sometimes
this could mean simply moving the sensor to the opposite wall in the room.