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The RFI Tower Top Amplifier (TTA) together with the Receiver Multicoupler / TTA
Controller (RMC) provides a low noise, high intercept point receive system designed
to amplify and distribute signals from a single tower mounted antenna to multiple
receivers. Set-up of the system is possible using either a manual interface or via the
Ethernet interface using a PC. TTA and RMC power, fault and control status is given
by LEDs on the RMC front and rear panels and can also be remotely monitored via
the Ethernet interface. Different models cover several DC voltage ranges and AC
operation is provided via an external AC to DC adapter.
Operating Precautions
•
There is no On/Off switch on the units, they become active as soon as DC power
is connected or the AC plug pack is switched on at the AC outlet.
•
Do not operate the unit outside the specified operating temperature range.
•
Do not open the unit as there are no user serviceable parts inside. All faulty
equipment should be returned to the supplier for repair.
Mounting
TTA - The TTA is designed for tower top installation. Please refer to the TTA Quick
Start Guide included with the TTA for installation instructions.
RMC - The RMC must be mounted indoors only. It is designed to fit in a 1U rack
space and should be mounted clear of any equipment that generates excess heat.
Do not mount the unit inside small unventilated enclosures.
Cabling
•
Connect the antenna cable to the ANTENNA port on the TTA.
•
Connect the TTA MAIN output to the RMC RF Input with the main feeder cable.
This cable should have a maximum loss of 6 dB at 824 MHz.
•
Connect the TTA Test output to the RMC rear panel Test Port.
Earthing and Lightning Protection
Compliance with international electrical safety standards requires that the external
Protective Earthing point on the TTA and RMC, as indicated by this symbol, be
permanently hardwired to the premises protective earth system using 1.5 mm
(14 AWG) minimum cross-sectional area conductor. These connections provide
protection from hazardous and transient voltages. It is essential to also install the
recommended lightning protectors on all interconnecting cables between the two
units.
TA7982-0100-10-00 and RX6996-3408-44-XXB
TOWER TOP AMPLIFIER and
RECEIVER MULTICOUPLER / TTA CONTROLLER
INTRODUCTION
GENERAL
INSTALLATION
2
1
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Summary of Contents for RFI RX6996-3408-44-XXB
- Page 1 RECEIVER MULTICOUPLER / TTA CONTROLLER INTRODUCTION The RFI Tower Top Amplifier (TTA) together with the Receiver Multicoupler / TTA Controller (RMC) provides a low noise, high intercept point receive system designed to amplify and distribute signals from a single tower mounted antenna to multiple receivers.
- Page 2 RF Connector Sealing Ensure that the RF connections to the TTA are appropriately sealed with self amalgamating tape to prevent ingress of moisture. RMC FRONT PANEL Ethernet Interface (LAN) Connect to either front panel Ethernet port (LAN) using the supplied cable either locally using a PC or remotely via a TCP/IP network.
- Page 3 TTA CONTROL via RMC TTA FAULT The red LED will light under the following circumstances. • The input voltage is outside the normal operating range • The internal power rails are outside the normal operating range. • The internal amplifier currents are outside the normal operating range. •...
- Page 4 RF INPUT Connects to the TTA via the main feeder cable and carries the RF signal, DC power and the communications channel between the RMC and TTA. RF OUTPUTS 1 to 8 Eight equal level RF outputs are available from the RMC. Best performance will be achieved if 50 ohm terminations are fitted to any unused RF outputs however, due to the high isolation between outputs, the performance degradation is minimal if unused RF outputs are left unterminated.
- Page 5 SYSTEM SET-UP Setting the Rotary Switches Setting the rear panel switches using the following information will result in a system gain of 15 dB. This is the recommended gain for a system operating at 800 MHz as it provides maximum protection for the station receivers while also obtaining good sensitivity.
- Page 6 Spectrum Analysis The signal level entering the station receivers should be checked with a spectrum analyzer. For best receiver performance all signals in the receive band should be less than -35 dBm. If any signals are above this level the Input Gain Attenuator should be increased 1 dB for every 2 dB the receive signal exceeds -35 dBm.
- Page 7 Configuration switch setting 3 Expansion Multicoupler Fig 3 - Up to 16 equal level RF Outputs Configuration switch setting 4 Expansion Port not used Up to 8 Expansion Multicouplers (internally terminated) Fig 4 - Up to 64 equal level RF Outputs...
- Page 8 Configuration switch setting 5 8 Expansion Multicouplers Expansion Multicoupler Up to 8 Expansion Multicouplers Fig 5 - Up to 128 equal level RF Outputs © Copyright 2016 RF Industries Pty Ltd. RMC+TTA U9i16A...
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