HM Electronics Inc XCVR2G4A Manuel D’Utilisation
User Guide | FreeSpeak II™
Page 22
6)
Repeat this process for as many antennas as necessary to cover the
required area. Overlap coverage zones so that there is no area where the
signal strength is below 30, and no area where the error rate is above a
few percent.
required area. Overlap coverage zones so that there is no area where the
signal strength is below 30, and no area where the error rate is above a
few percent.
7)
The antenna placement will need to be adjusted to get the best coverage.
Figure 3-5 Mapping overlapping coverage zones
In some environments you might observe that despite having a high signal
strength, the beltpack consistently reports a high error rate.
strength, the beltpack consistently reports a high error rate.
This could be due to two things:
•
In-band interference from an RF source broadcasting in the 1.9/2.4 GHz
area of the spectrum. This can be verified using a band monitor or by
using a Spectrum Analyzer.
area of the spectrum. This can be verified using a band monitor or by
using a Spectrum Analyzer.
•
Long Delay Spread Multipath, where the signal is bounced off a number of
reflective surfaces, such as metal ceilings, gantries, walkways or other
large structures. This problem is greatest where the reflective surface is
large and exists at a range of distances from the antenna. To reduce the
problem, consider siting the antenna where it cannot “see” the reflective
surface or installing a reflector close to the antenna between it and the
reflective surface.
reflective surfaces, such as metal ceilings, gantries, walkways or other
large structures. This problem is greatest where the reflective surface is
large and exists at a range of distances from the antenna. To reduce the
problem, consider siting the antenna where it cannot “see” the reflective
surface or installing a reflector close to the antenna between it and the
reflective surface.
3.3.2
Testing antenna handoff
After testing the coverage areas for individual antennas, test the handoff between
the antennas. When you walk through a coverage area with the beltpack, the
beltpack searches to find the antenna with the best signal strength, and switches
transmission to that antenna. Therefore the beltpack continually hands off
transmission among antennas as you move through the coverage area. You can
determine which antenna the beltpack is connected to using the Configuration
Editor Diagnostics Tool.
the antennas. When you walk through a coverage area with the beltpack, the
beltpack searches to find the antenna with the best signal strength, and switches
transmission to that antenna. Therefore the beltpack continually hands off
transmission among antennas as you move through the coverage area. You can
determine which antenna the beltpack is connected to using the Configuration
Editor Diagnostics Tool.
To test antenna handoff, connect any additional antennas in the installation and
walk through the coverage areas to ensure that the coverage is continuous and
complete, without audio breakups. Reposition antennas if necessary.
walk through the coverage areas to ensure that the coverage is continuous and
complete, without audio breakups. Reposition antennas if necessary.
Zone A
1 user
Zone C
4 users
Zone B
5 users