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PES1900Gi NR Operations Manual
Chapter 1. Overview — 3
Functional Description
The PES1900Gi NR uses an Intermediate Frequency (IF) filtering design to achieve a high degree of
selectivity. A common local oscillator is used for up- and down-conversion to prevent frequency
conversion error.
This repeater is frequency segment or block selective. A family of IF filter bandwidths are available to
support various multi-carrier GSM/GPRS/EDGE and WCDMA applications.
The RepeaterNet Craft software is the configuration management and alarm-monitoring interface for
the PES1900Gi NR. The Repeater has two COM (communication) ports for RepeaterNet
connections—a serial port for direct, laptop connections and a modem port for remote connections.
An ALC (Automatic Level Control) circuit protects the repeater’s LNA (Low-Noise Amplifier) from
potentially damagingly high input levels and prevents the generation of Intermodulation Distortion
(IMD) in the transmit power amplifier.
The signal processing flow through the repeater in the Forward direction (Donor Cell Site to Mobile) is
similar to the flow in the Reverse direction (Mobile to Donor Cell Site).
Signal flow is as follows:
1. The received signal from the Cell Site antenna enters the repeater by way of the cabinet-
mounted, Type N(f) connector and feeds to a diplexer filter.
2. The signal then is amplified by an LNA, and down-converted to an Intermediate Frequency (IF).
3. After being filtered by Surface Acoustic Wave (SAW) filters, the output signal is up-converted and
precisely restored to the original radio frequency by using the same Local Oscillator (LO) as the
down-converter.
4. The transmit power amplifiers further amplifies the signal to achieve final transmit Radio
Frequency power levels.
5. The signal finally routes through the output diplexer to the mobile antenna. (The diplexers permit
use of common antennas for both transmit and receive signals while effectively separating the
receive band from the transmit band.)
Licensing
All owners of the PES1900Gi NR should consult with the appropriate local and national agencies for
information about licensing.