24. INTERNATIONAL STATION 700MHZ BDA (80-330558-1) Rack number C09-CR-09 International Station 700MHz BDA (80-330558-1) List of Major Components Section 24.3.1. 24.3.2. 24.3.3. 24.3.4.
4.1.
24.2.
24.3. International Station 700MHz BDA (80-330558-1) Major Components 24.3.1. 4 Port Hybrid Coupler (05-003007) This transmitter hybrid coupler is a device for accurately matching two or more RF signals to single or multiple ports, whilst maintaining an accurate 50Ω load to all inputs/outputs and ensuring that the insertion losses are kept to a minimum. Any unused ports should be terminated with an appropriate 50Ω load.
24.3.3. 700MHz 5 Cavity Combiner System (50-132105) 700MHz 5 Cavity Combiner System (50-132105) consists of 5 Dielectric Cavity Resonators mounted on two 3U rack mount panels, three on one panel and two on the other 700MHz 5 Cavity Combiner System (50-132105) List of Major Components section 20.3.2.3.
Document Number 80-330501HBKM – Issue A - Draft 265.9 6U 265.9 6U 190.50 37.7 190.50 37.7 AA ORIGINAL ISSUE PL 18/10/2007 PB PL MATERIAL - FRONT PANEL & CHASSIS - ALUMINIUM FINISH - FRONT PANEL - IRIDITE FRONT PANEL - PAINTED RAL7035 (FRONT FACE & EDGES) CONNECTORS - `N' TYPE SOCKET PRODUCT NUMBER : 50-132105 466.00 482.
24.3.3.2.
24.3.3.3. Dielectric Cavity Resonator (04-003402) Cavity resonators are used in this system for their high Q factor response and power handling characteristics. Being finely tuned items, they can be prone to being de-tuned by mechanical shock or vibration therefore these units should be handled, stored and installed with care. Note that the cavities are coupled together using critical length harnesses. If any cable is to be changed the exact same length and type of cable should be used for replacement.
24.3.4. 700MHz 4 Cavity Combiner System (50-132106) 700MHz 4 Cavity Combiner System (50-132106) consists of 4 Dielectric Cavity Resonators mounted on two 3U rack mount panels, three on one panel and two on the other 700MHz 4 Cavity Combiner System (50-132106) List of Major Components section 20.3.3.3.
Document Number 80-330501HBKM – Issue A - Draft A B C D E F 190.50 37.7 190.50 8 37.7 265.9 6U 265.9 6U 8 466.00 482.
24.3.4.2.
24.3.4.3. Dielectric Cavity Resonator (04-003402 Cavity resonators are used in this system for their high Q factor response and power handling characteristics. Being finely tuned items, they can be prone to being de-tuned by mechanical shock or vibration therefore these units should be handled, stored and installed with care. Note that the cavities are coupled together using critical length harnesses. If any cable is to be changed the exact same length and type of cable should be used for replacement.
25. INTERNATIONAL STATION 700MHz BDA (80-330558-2) Rack number C09-CR-10 International Station 700MHz BDA (80-330558-2) List of Major Components Section 25.3.1. 25.3.2. 25.3.3.
25.1.
25.2.
25.3. International Station 700MHz BDA (80-330558-2) Major Components 25.3.1. 700MHz Channelised Amplifier (50-132102) 3U rack mount shelf 700MHz Channelised Amplifier (50-132102) List of major Components Section 25.3.1.3. 25.3.1.4. 25.3.1.5. 25.3.1.6. 25.3.1.7. 25.3.1.8. 25.3.1.9. 25.3.1.10. 25.3.1.11. 25.3.1.12. 25.3.1.13.
25.3.1.1.
25.3.1.2.
25.3.1.3. Dummy load 09-000902 Dual Isolator (770MHz) (93-910048) has one of its ports terminated with Dummy load 09-000902 in order to achieve the correct power rating to absorb the reflected power levels that can be reasonably expected within the system. 09-000902 specification PARAMETER Frequency Range Power Rating VSWR Impedance Temperature Range RF Connectors Dimension Weight Finish RF Connector Environmental MTBF SPECIFICATION 0 - 2500 MHz 25 Watts continuous Better than 1.
25.3.1.5. Low Noise Amplifier (11-006702) The Gallium-Arsenide low noise amplifiers used in 800MHz Line Amplifier (55-165703) are double stage, solid-state low noise amplifiers. Class A circuitry is used throughout the units to ensure excellent linearity and extremely low noise over a very wide dynamic range. The active devices are very moderately rated to provide a long trouble-free working life.
25.3.1.6 Power Amplifier (12-020804) This amplifier is a Class AB 40W power amplifier from 860MHz to 960MHz in balanced configuration. The amplifier demonstrates a very good input/output return loss (RL) and it has a built-in Current Fault Alarm Function. The unit housing is an aluminium case (Iridite NCP finish) with SMA connectors for the RF input/output and a D-Type connector for the power supply and the Current Fault Alarm Function.
25.3.1.7. DC/DC Converter 13-003412 13-003412 is based upon an O.E.M. DC/DC Converter module with a wide input range and and is used to derive a 12V fixed voltage power supply rail from a higher voltage supply, in this case 24V. In the event of failure this unit should not be repaired, only replaced. 13-003412 Specification PARAMETER Operating voltage Output voltages Output current Temperature operational range storage SPECIFICATION 18 – 75V DC 12V (typical) 5.0A (Max) -10%C to +60%C -20%C to +70%C 25.3.
25.3.1.9. Channel Control Module (17-011501) The operating frequency for each channel in each repeater is programmed by 16 DIL (Dual In Line) switches. The programming switches are mounted in the Channel Control Module. The Channel Selectivity Modules are connected to the Channel Control Module via multi-way ribbon cables. Adjacent to the DIL switches for each channel is a toggle switch to turn on and off individual channels as required. A green LED indicates the power status of each channel.
Programming Example Frequency required: 454.000MHz Channel spacing: 12.5kHz Synthesiser offset: -21.4MHz The Local Oscillator frequency is therefore: 454.000 – 21.4 = 432.600MHz Dividing the Local Oscillator frequency by the channel spacing of 0.0125MHz: 432.600 = 34608 0.0125 This is an integer value, therefore it is OK to proceed. Local Oscillator Frequency 432.
.3.1.10. 24V Relay Board (80-008902) The General Purpose Relay Board allows the inversion of signals and the isolation of circuits. It is equipped with a single, dual pole, change-over relay RL1 with completely isolated wiring, accessed via screw terminals. The relay is provided with a polarity protection diode and diodes for suppressing the transients caused by "flywheel effect" which can destroy switching transistors or induce spikes on neighbouring circuits.
25.3.1.12. Dual Diode Assembly (94-100004) The purpose of these dual diode assemblies is to allow two DC voltage sources to be combined, so that the main DC rail within the equipment can be sourced from either a mains driven PSU, or externally through an XLR connector or from dual mains driven PSUs . They are very heavy-duty diodes and they prevent any reverse current from flowing back to their source or the alternative supply rail.
25.3.2. 700MHz Uplink Amplifier (50-132107) 2U rack mount tray 700MHz Uplink Amplifier (50-132107) List of major Components Section 25.3.2.3. 25.3.2.4. 25.3.2.5. 25.3.2.6. 25.3.2.7. 25.3.2.8. 25.3.2.9. 25.3.2.10. Component Part 10-000701 11-006702 12-021901 13-003412 17-001109 17-001201 80-008901 94-100004 96-300052 Component Part Description Switched Attenuator 0.
25.3.2.1.
25.3.2.2.
25.3.2.3. Switched Attenuator 0.25Watt, 0 - 30dB (10-000701) In many practical applications for Cell Enhancers etc., the gain in each path is found to be excessive. Therefore, provision is made within the unit for the setting of attenuation in each path, to reduce the gain. Switched Attenuator 10-000701 provides attenuation from 0 to 30dB in 2 dB steps The attenuation is simply set using the four miniature toggle switches on the top of each unit.
Low Noise Amplifier (11-006702) ‘D’ Connector Pin-out details Connector pin 1 2 3 4 5 6 7 8 9 Signal +Ve input (10-24V) GND Alarm RelayO/P bad Alarm Relay common Alarm Relay good No connection TTL voltage set TTL alarm/0V (good) O/C good/0V bad 9-Way Pin-Out Graphical Representation 1 2 6 3 7 4 8 5 9 25.3.2.5. Low Power Amplifier (12-021901) The low power amplifier used is a triple stage solid-state low-noise amplifier.
Low Power Amplifier (12-021901) 7-Way Connector Pin-outs Connector Pin A1 (large pin) A2 (large pin) 1 2 3 4 5 Signal +24V DC GND Alarm relay common TTL alarm/0V good Alarm relay contact (bad) Alarm relay contact (good) O/C good/0V bad (TTL) 25.3.2.6. DC/DC Converter 13-003412 13-003412 is based upon an O.E.M. DC/DC Converter module with a wide input range and and is used to derive a 12V fixed voltage power supply rail from a higher voltage supply, in this case 24V.
Normally the attenuator is at minimum attenuation. The detector/amplifier unit monitors the RF level being delivered by the power amplifier, and when a certain threshold is reached it begins to increase the value of the attenuator to limit the RF output to the (factory set) threshold. Therefore overloading of the power amplifier is avoided. The factory set threshold is 1dB below the Enhancer 1dB compression point. Some adjustment of this AGC threshold level is possible, a 10dB range is mostly achieved.
80-008901 Specification PARAMETER SPECIFICATION Operating voltage 8 to 30V (floating earth) Alarm threshold Vcc - 1.20 volt +15% Alarm output relay contacts: Max. switch current 1.0Amp Max. switch volts 120Vdc/60VA Max. switch power 24W/60VA Min. switch load 10.0µA/10.0mV Relay isolation 1.5kV Mechanical life >2x107 operations Relay approval BT type 56 Connector details Screw terminals Temperature operational -10°C to +60°C range storage -20°C to +70°C 25.3.2.9.
25.3.3. 700MHz Downlink Splitter (50-132108) 2U rack mount tray 700MHz Downlink Splitter (50-132108) List of Major Components Section 25.3.3.3. 25.3.3.4. 25.3.3.5. Component Part 05-003302 10-000901 80-007401 Component Part Description Four Way Splitter/Combiner Switched Attenuator 0.
25.3.3.1.
25.3.3.2.
25.3.3.3. Four Way Splitter/Combiner (05-003302) The Splitter/Combiner used is a device for accurately matching two or more RF signals to single or multiple ports, whilst maintaining an accurate 50Ω load to all inputs/outputs and ensuring that the VSWR and insertion losses are kept to a minimum. Any unused ports should be terminated with an appropriate 50Ω load.
25.3.3.5. Dummy Load (80-007401) When a combiner system is used to split or combine RF signals, in many cases it is most cost effective to use a standard stock item 4, 6 or 8 port device where, in fact, only a 3 or 6 port device is needed. In this case seven of the outputs from the Four Way Splitter/Combiner (05-003302) have their ports terminated with Dummy Load (80-007401) in order to preserve the correct impedance of the devices over the specified frequency range.
