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•
MULTIPLE CHANNEL AMPLIFICATION POWER DE-RATING REQUIREMENTS
BDA's will amplify all signals that fall within their Pass-Band range. The output power will be "shared" between all channels being
amplified. Another multiple channel effect is Intermodulation - off-channel signals produced from non-linear effects between the
intended channel signals. These may cause interference to receiving equipment.
In order to minimize Intermodulation off-channel signals, Power De-rating must be applied. In the USA there are FCC
Intermodulation Specifications published in the EIA Standard PN2009. The Tables below give the maximum per channel Output
Levels allowed as a function of the number of channel.
Note that depending on the actual amplifier input levels, the gain of the BDA may need to be reduced to comply with the above
regulations.
Number of Channels
1
2
4
6
8
10
Number of Channels
1
2
4
6
8
10
Note: Above levels are established with AGC disabled. De-ratings are based on values calculated using EIA standard
PN2009. Actual Amplifier performance may exceed the above criteria.
•
BOOSTER AUTOMATIC GAIN CONTROL (AGC) FUNCTIONAL DESCRIPTION
Both Downlink and Uplink paths, with Boosters only, or with Boosters and PA's, are equipped with AGC. The Booster based AGC
has a dynamic attenuation range that maintains a factory set composite output nominal power of +23.2 dBm at the Booster output.
The AGC gain varies dynamically to maintain this level and limits strong signal levels that could cause more Intermodulation. The
AGC starts to turn on at +23.2 dBm, therefore, at a gain setting of 70 dB, the AGC will start to turn on at +23.2 – 70 = -46.8 dBm
input level, and would maintain the +23.2 dBm output at an input levels higher than –46.8 dBm. Below the AGC turn-on threshold,
the output level will decrease linearly with the input signal. With a PA installed in the path, the AGC maximum output level is 15 dB
higher.
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Maximum Output Power per Single Channel for Uplink or Downlink
Using both a Booster and PA
Maximum Output Power per Single Channel for Uplink or Downlink
Using only a Booster
Kaval Telecom Inc.
+40.0 dBm
+28.7 dBm
+24.0 dBm
+21.3 dBm
+19.5 dBm
+18.1 dBm
+27.0 dBm
+20.1 dBm
+15.4 dBm
+12.7 dBm
+10.8 dBm
+9.4 dBm
DCM000000001
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