Signal Issue

Hi,

I have a serious problem with my setup.

I have a Wi-Fi Base station which has the EIRP of 36 dBm.

Radio Transmit Power is around 23dBm and the antenna gain is 14dBi + 0r - 1dBi loss.

The Polarization pattern is both Horizontal. The Beamwidth is H -120 degree and V- 30 Degree.

Am using the 2 different type of Horizontal Pol CPE is for my customers.

Type 1 :

1. 400 mW CPE with 14 dBi antenna(Aluminium Antennae) which has the receiver sensitivity of radio is -95dBm beamwidth 45/30 degree

Type 2:

1. 500mW CPE with 12 dBi Antennae (Copper) which has the receiver sensitivity of -97 dBm. Beamwidth 25/25 degree


The problem is around one kilo meter distance i was trying to install the CPE from my base station, the Type 1 CPE is given around 60% of the signal strength but the type 2 Antennae not listing the signal or maybe lesser than the 30% of signal strength..... What could be the possible issues on this.


I have a clear LOS and checked the RF pigtail ..... Everything is fine.


Anyone can help me on this issue??

Regards,
Rishi

You're confusing polarization and pattern.

I really doubt if you have a dual-polarity antenna. If your antenna (and radio) has only one antenna port, then it is not dual-polarity. Most likely its a vertically polarized sector antenna (HPOL sectors are many times more expensive).

Your antenna pattern of 120º in the horizontal (azimuth) plane and 30º in the vertical (elevation) plane could apply to both a horizontally and vertically polarized antenna, so those numbers aren't going to tell you the polarity of the antenna.

I'm going to take a guess you're installing some of your CPE antennas aligned to the wrong polarity.

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I will clear your doubt... Am using the H-Pol antennae only and the coverage area is 120 degree.. I think now its clear for you. And my CPE's also in Horizontal..... Not the vertical one.

So can you pls tell your suggestion

Regards,
Rishi

Thanks for your suggestion .. But am trying to solve the existing issue with existing infra which are also equivelent

Regards,
Rishi

Narrow the scope of the issue by eliminating different location oddities. I would pick a customer's location and try both radios, compare the results. Then do it again at another customer's location, and then a third time.

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Support :: Calculations :: System Operating Margin :: Terabeam Wireless

the milliwatt to dbm conversion calculator:

Support :: Calculations :: dBm vs. Watts :: Terabeam Wireless

400 mW = 26 dBm
500 mW = 27 dBm

Customer should see -52.8

knowing what you should have, determine what you get, figure out the difference and report back

You are right mark... The SOM is around 45 dB.

But the RSSI level in the customer end is low. Any clue?

Regards,
Rishi