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— Chapter 1. Overview
RF-7000E Operations Manual
2
Functional Description
1.
The RF-7000E assembly is an RF through repeater designed for remote locations. Little
alignment is required, and the use of highly reliable components and minimum active circuitry
eliminates most subsequent maintenance. The repeater assembly consists of an equipment
mounting panel, contained in an aluminum, weatherproof, enclosure. If desired, the equipment
mounting panel may be mounted in an EIA 19-inch rack, or the complete assembly may be wall-
mounted. In most applications however, the complete assembly is pipe-frame or tower-mounted.
Front views of the repeater are shown in Figures 1 and 2.
2.
In addition to the RF-7000E repeater assembly, Peninsula Engineering Solutions offers
accessory equipment consisting of antennas and mounting hardware, waveguide, and complete
site power supply systems. The recommended antennas are solid or high performance types
chosen per application.
Basic Repeater
3.
The RF-7000E duplex repeater uses internally redundant amplifiers for transmission in each of
two directions. Each amplifier is powered by two separate battery supplies for added reliability.
Bandpass filters and circulators, which form a duplexer network, direct the received signals to the
amplifiers and combine the amplifier outputs with the received signals to a common antenna port
for transmission in each direction (see Figures 4 to 16). The repeater supports frequency division
duplex, FDD, radio link systems where separate frequencies are used in each direction.
4.
The received signal from "A" antenna, identified as frequency "f1", enters the repeater panel via
the cabinet mounted CPR112G, waveguide flange and is then fed to a RX-TX branching
circulator. Then from the channel branching circulator, the f1 signal is passed to the f1 receive
bandpass filter. The bandpass filter passes the f1 signal to a terminated coaxial circulator and
(optional) f1 receive pad and then to amplifier A1. The amplified signal passes through the
(optional) f1 transmit pad. From the transmit pad the f1 signal then passes through a terminated
coaxial circulator and the f1 transmit bandpass filter to the channel branching circulator and then
to the RX-TX branching circulator. From there to cabinet mounted CPR112G, waveguide flange
for connection to the "B" antenna.
5.
In the other direction, the receive signal from "B" antenna, identified as frequency "f2", enters the
repeater panel via the cabinet mounted CPR112G, waveguide flange and is then fed to a RX-TX
branching circulator. Then from the channel branching circulator, the f2 signal is passed to the f2
receive bandpass filter. The bandpass filter passes the f2 signal to a terminated coaxial
circulator and (optional) f2 receive pad and then to amplifier 2. The amplified signal passes to
(optional) f2 transmit pad. From the transmit pad the f2 signal then passes through a terminated
coaxial circulator and the f2 transmit bandpass filter to the transmit channel branching circulator
and then to the RX-TX branching circulator and the cabinet mounted CPR112G, waveguide
flange for connection to "A" antenna.
6.
Receive pads RX f1 and RX f2 reduce the repeater receive signals to approximate the
recommended input level. The transmit pads designated TX f1 and TX f2 reduce the output
signal levels of the repeater for regulatory compliance and to prevent overloading of the terminal
receiver on a short hop. Pads are mounted on input and output of amplifiers. Nominal input and
output power level for various repeater channel configuration are listed at in Technical Summary
following this section.
7.
Delay Equalizers are added to correct for the slope and parabolic group delay introduced by the
bandpass filters and branching networks. Equalized repeaters are recommended for high
capacity systems, tandem repeater applications and multiple carrier 1+1, 2+0 configurations.
Amplifiers
8.
In digital radio applications, in order to maintain linearity over the entire signaling envelope, the
amplifiers operate at a reduced average power level to meet the output power level requirement