For the PCS frequencies the max transmitter power is 8 or 15 watts
depending on the equipment per carrier. Antenna gain is typically 16 to
18 dBi per sector. Usually 3 sectors. The average power usually runs
about a fifth to tenth of that. Most systems have at least 2 carriers
(wideband channels) per sector and some as many as 5 carriers in a busy
market.
For 15 watts max per sector per carrier you have 41.7 dBm to antenna
maybe 1.5dB min feedline and connector loss and 17 dBi for antenna
which gives you
57.2 dBm. This is 524 watts per sector per carrier at max output
power. Remember the power output of todays CDMA carriers for both
cellular and PCS is widely variable based on traffic loading. I would
say you could have an average over the day of 1/5 the max output which
puts you right at 100W per sector per channel. Typical sector
beamwiths (hoizontal) on those antennas are 65 degrees at 3dB points.
The vertical beamwidth is only 3 degrees or less and often the antenna
is downtilted to keep interference from adjacent cells or cells on the
horizon. The design of CDMA systems is an exercise in interference
management.
Let me know if you have more questions or the info not clear.
-Dave WD7Z
Jim Brown wrote:
>For an "RFI for audio guys" applications note I am writing, I would
>like to know the approximate transmit power levels for cellular base
>stations. I'm guessing around 100w ERP on peaks?
>
>Jim Brown K9YC
>
>
>_______________________________________________
>
>See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless
>Weather Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any
>questions and ask for Sherman, W2FLA.
>
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>
>
>
>
_______________________________________________
See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather
Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions
and ask for Sherman, W2FLA.
_______________________________________________
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