Wireless: FSII beltpacks drop out short distance from transceiver antennas
Question: I'm using Freespeak II in a new facility and having issues with short range while getting good RSSI numbers on the BP display. Good line of site with transceiver antennas, but the audio breaks up 30 - 40 feet (10-15m) from any antenna. Any ideas of what to look for?
Answer: In some environments you might observe that despite having a high signal strength (RSSI), the beltpack consistently reports a high error rate.
This could be due to two things:
note: Long Delay Spread Multipath is an issue for all radio systems (digital or analogue)
Answer: In some environments you might observe that despite having a high signal strength (RSSI), 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.
- 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 placing the transceiver antenna where it cannot “see” the reflective surface or installing a reflector close to the antenna between it and the reflective surface. See the diagram below of how long delay spread multipath can happen.
note: Long Delay Spread Multipath is an issue for all radio systems (digital or analogue)
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