I put up a remote 900 AP five weeks ago…The system was running just fine with six new customers. Two weeks ago, a lighting storm ran through the area. Since the storm, the system has been up and down…We have replaced some damaged elements at various customer sites (lighting protectors, a couple of SM’s, power supplies ect). As part of the trouble shooting process we changed the AP, antenna, cables and upgraded all the units to 8.2.1. The system is somewhat stable but we have noticed a big difference in the power levels we are seeing from the AP…prior to the storm, at a cusotmer one mile away and with clear LOS, the specturm analyzer showed a reading better than -40 dBm (they were redlined). Now the same customer is running a level of -60 dBm.
Can anyone tell me what they see as an average dBm from a new AP and omni antenna…about a mile away???
Software Version : CANOPY 7.3.6 Oct 24 2005 12:06:56
Software Boot Version : CANOPYBOOT 3.0
FPGA Version : 070605 (DES Sched) P9
Session Timeout: 0, AirDelay 93 (approximately 2.59 miles (13671 feet))
Session Count: 12, Reg Count 4, Re-Reg Count 8
RSSI (Avg/Last): 1840/1839 Jitter (Avg/Last): 3/3 Power Level (Avg/Last): -57/-57
DnRate(SM): 20000 DnLimit(SM): 500000 UpRate(SM): 20000 UpLimit(SM): 500000 (kbit)
LoUpCIR(SM): 0 LoDnCIR(SM): 0 (kbps)
Rate : VC 21 Rate 1X/1X
This user is about 3 miles away and with a solid power level of -57db. This is a 2 month old motorola canopy advantage 900mhz AP on a MTI 8’ omni antenna. I have about 30 users on this tower with ranges varying from 1500ft to about 12 miles.
My closest user:
Software Version : CANOPY 7.3.6 Oct 24 2005 12:06:56
Software Boot Version : CANOPYBOOT 3.0
FPGA Version : 070605 (DES Sched) P9
Session Timeout: 0, AirDelay 12 (approximately 0.33 miles (1764 feet))
Session Count: 1, Reg Count 1, Re-Reg Count 0
RSSI (Avg/Last): 1594/1590 Jitter (Avg/Last): 2/3 Power Level (Avg/Last): -62/-63
DnRate(SM): 20000 DnLimit(SM): 500000 UpRate(SM): 20000 UpLimit(SM): 500000 (kbit)
LoUpCIR(SM): 0 LoDnCIR(SM): 0 (kbps)
Rate : VC 25 Rate 1X/1X
As you can see this user is 1/3rd mi away from the tower with a power level of -62/-63. This is changeable due to the Tx power @ the SM. Check the transmit power on the SM in question.
Pnut
we put up a tower in the beginning of a light rainshower once, our 900omni ended up testing with very low levels. turns out some water got into the coax used to hook up the antenna to the radio & we had to climb the tower to replace the coax. be sure you replaced any coax between the radio/antenna/filter.
after that our power levels to sm’s a mile away went from like 80dB to ~50dB.
hope that helps.
The customer that had a -40 did you replace their SM with a P10 SM. If so it’s probably the P10 SM. We’ve notice HUGE differences in power levels from the P9’s to the P10’s.
If you swapped out the AP with a P10 from a P9 then it could be the AP as well. We have also found that the P10 AP’s are weaker in that regards as well as apposed to the P9 AP’s.