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RSSI. What does it mean?
- Thread starter doogymon
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- Jan 15, 2007
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The numbers are arbitrary, but they can be calibrated to actual values. The calibration would have to be done on each receiver, and on each band for a multiband receiver. Typically, RSSI values for identical receivers will be at least slightly different.
JRayfield
Member
On the MOTOTRBO radios, the RSSI value that can be read on the display on the radio is not relative (as it is in the high-tier APX series of radios). It is calibrated in dbm (with reference to a 50 ohm load), so it should be very close between radios.
Checking a couple of portables (XPR6550 and XPR7550) with a service monitor showed the RSSI values, shown on the portables, to be within 1 to 2 db of actual signal level from the service monitor.
This makes sense, that these RSSI values would have to be calibrated, since RSSI values are used to set up roaming in an IP Site Connect network. If these RSSI values were 'relative', then there would never be a way of accurately setting up roaming.
John Rayfield, Jr.
Checking a couple of portables (XPR6550 and XPR7550) with a service monitor showed the RSSI values, shown on the portables, to be within 1 to 2 db of actual signal level from the service monitor.
This makes sense, that these RSSI values would have to be calibrated, since RSSI values are used to set up roaming in an IP Site Connect network. If these RSSI values were 'relative', then there would never be a way of accurately setting up roaming.
John Rayfield, Jr.
ind224
Member
I can't be more specific but the actual "possible desired" RSSI would likely be dictated by the system engineers using their devices. In my case an average value of -50 or less was desired for a 3 minute duration test while we were stationary. One site required over 6 trips for retesting and we still never got the threshold they wanted. Whatever changes were being made before retesting were not being done in real time.
Whether or not it was actually problematic was not part of my need to know so I don't know. The only thing we could do on our end was move the device in the confines of the vehicle.
Whether or not it was actually problematic was not part of my need to know so I don't know. The only thing we could do on our end was move the device in the confines of the vehicle.
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