User Manual - IRT Communications
Contents
1. a L 35 SE 849 L s o WITT f avi9z vid goessa L z w T 9 or diaa L 8v SZ eld zga goessa avive avez 90190 s T 19a ae ave u00 2 gt Toad rea 849 ATS J aviz ld la id uo goessa so L YOLVANALLY avez ave avi0e Id LMANI2. Phone 61 2 9439 3744 Fax 61 29439 7439 Email service irtelectronics com 3085 rwa ib rev4 doc Page 9 of 10 16 10 2007 Drawing index Drawing Sheet Description 804258 1 RWA 3085 IF splitter circuit schematic 3085 rwa ib rev4 doc Page 10 of 10 16 10 2007 90 Z VITVY LSNV MSN NOWYVLYV L00Z 90 leq PII Ald S luono l3 LYI Z uolsIA93J bJOL A SLN ddv ONA ON umes yeous 8S r08 N DuIwe1q a1v0s GaNOSHO 3 NM NMVUG F YAlsANdWV NOILNGIMLSIC 4 TNASNOO 8 g 5 NALLIYM LNOHLIM 22g seen PRU ALHYd GHIHL gga ANY OL 3SO19SIG lt 2 J LY YON AdO9 LON OG ENGO IHOAdOD Q 9 H 080 kar 2 P Nao taq ZS 00 gt y A TA te noL alk uoL Aw ey F uo ze i vo T o aE elo AA oT A NIA Nve ANOD gY ZE 8gv z gv 8v 0z 8v 6L 9Y 44 9Y 84 av ol av St av bl av el agv OL gv gY Z gY 4 YOLINOW Id SL avt h ze d s rao O ava gv 9 h er AN zao KS avid avis h wv d s eao KS SV 6 gv L h sr 4 K rao O RFS y GL L S OSd YaLLNds ds ire N azlapz vzg8d av9ESNl baz S4 SSI 652708 99d
3. 0 16 10 2007 Technical specifications RF Input Number Impedance Return loss Maximum input level Outputs Number Impedance Return loss Isolation between outputs Maximum output level Performance Input output gain Frequency response Referenced to 70 MHz Group delay Two tone intermodulation IP3 65 MHz 75 MHz test signals Noise Referenced to a 10 dBm signal Connectors Power requirements Power consumption Other Temperature range Mechanical Finish Front panel Rear assembly Dimensions Dimensions Optional accessories IRT Eurocard module Type RWA 3085 1 75 Q gt 14 dB 40 100 MHz gt 0 dBm 4 plus 1 x front panel monitoring 75 Q gt 14 dB 40 100 MHz gt 20 dB 40 100 MHz gt 10 dBm at 70 MHz 5 to 15 dB Adjustable from front panel 40 to 100 MHz 1 dB 2 ns 40 100 MHz gt 20 dBm 110 dBc Hz BNC 14 0 14 Vac or 15 Vdc lt 10 5 VA 0 45 C ambient Mounts in IRT 19 rack chassis Maximum number per frame is dependent on PSU capability other types of modules in same frame and air circulation See installation section of manual Grey enamel silk screened black lettering amp red IRT logo Detachable silk screened PCB with direct mount connectors to Eurocard and external signals 6 HP x 3 U x 220 mm IRT Eurocard 30 mm x 3 U x 231 mm IRT Eurocard Instruction manual Due to our policy of continuing developme
4. I R T Electronics Pty Ltd A B N 35 000 832 575 26 Hotham Parade ARTARMON N S W 2064 AUSTRALIA National Phone 02 94393744 Fax 02 9439 7439 International 61 2 9439 3744 61 2 9439 7439 Email sales irtelectronics com Web _ www irtelectronics com IRT Eurocard Type RWA 3085 RF Distribution Amplifier for 70 MHz IF signals Designed and manufactured in Australia IRT can be found on the Internet at http www irtelectronics com 3085 rwa ib rev4 doc Page 1 of 10 16 10 2007 3085 rwa ib rev4 doc IRT Eurocard Type RWA 3085 RF Distribution Amplifier for 70 MHz IF Signals Instruction Book Table of Contents Section General description Technical specifications Technical description Internal adjustments Installation RF connections Front amp rear panel connector diagrams Maintenance amp storage Warranty amp service Equipment return Drawing index This instruction book applies to units later than S N 9900000 Page 2 of 10 Y ya p XO XO XO OO 1 O Q Q FW 16 10 2007 General description The RWA 3085 has been designed to provide distribution and amplification of signals in 70 MHz IF systems An input attenuator with a 20 dB range provides gain control to optimise signal levels at the output This allows adjustment from 5 dB to 15 dB from input to output The amplifier will tolerate a wide range of input levels to a maximum of 0 dBm and a maximum output level of 10 dB
5. extended by IRT only to the extent obtainable from the component supplier Equipment return Before arranging service ensure that the fault is in the unit to be serviced and not in associated equipment If possible confirm this by substitution Before returning equipment contact should be made with IRT or your local agent to determine whether the equipment can be serviced in the field or should be returned for repair The equipment should be properly packed for return observing antistatic procedures The following information should accompany the unit to be returned A fault report should be included indicating the nature of the fault The operating conditions under which the fault initially occurred Any additional information which may be of assistance in fault location and remedy A contact name and telephone and fax numbers Details of payment method for items not covered by warranty Full return address For situations when No Fault Found for repairs a minimum charge of 1 hour s labour will apply whether the equipment is within the warranty period or not Contact IRT for current hourly rate ON Oy Re uh a Please note that all freight charges are the responsibility of the customer The equipment should be returned to the agent who originally supplied the equipment or where this is not possible to IRT direct as follows Equipment Service IRT Electronics Pty Ltd 26 Hotham Parade ARTARMON N S W 2064 AUSTRALIA
6. m The frequency response of the amplifier is tailored to give optimum low noise amplification to 70 MHz IF signals used in satellite distribution The amplifier finds special application in the provision of redundant path generation for fibre optic links from satellite sites to control centres The amplifier may also be used to distribute one satellite feed to numerous down converters and decoders for viewing multiple channels from one satellite receiving dish The RWA 3085 may be mounted in standard IRT Eurocard frames alongside other Eurocard modules including switchers and fibre optic transmitters or receivers for 70 MHz IF signals Standard features 40 100 MHz frequency response optimised for use in 70 MHz IF distribution Very low noise 5 15 dB variable gain control Output monitoring on front panel Equipment provided Standard RWA 3085 RF distribution amplifier module RWA 3085 Rear connector assembly Accessories available FR 700 Eurocard module mounting frame Mounts up to 12 Eurocard modules and one PT 700 Dual AC power supply side by side in 134 mm of standard rack space 3 Rack Units FRU 1030 1 RU chassis conversion PSU Converts Eurocards to a 1 rack unit format The FRU 1030 can be fitted with either one or two Eurocards in a horizontal side by side format A single AC power supply is included to power the cards TME 6 Eurocard extender board Instruction Book 3085 rwa ib rev4 doc Page 3 of 1
7. module Should these fail they should only be replaced by resistors of the same type and value or damage may result to the module and may also effect the operation of other modules in the same frame The rectified power is filtered by capacitors C 5 to C 12 providing both high an d low frequency filtering The BGY67A hybrid amplifier module is the only active component in the RWA 3085 This amplifier requires a single sided DC supply of 24 V which is outside the range normally available from the frame s AC power supply buss In order to obtain this supply a DC DC converter is employed This converter may be damaged by overvoltage on its input and so input protection is provided by the Zener diode ZD 1 and resistors R 1 amp 2 which limit the input voltage to 33 Volts The output of the DC DC converter has additional filtering applied by the LC network of C 13 to 15 and L 1 The front panel DC LED is fed from the 24 Vdc supply and thus gives a true indication of the whole power supply operation and power being available to the amplifier module Internal adjustments The RWA 3085 has no internal adjustments or user serviceable parts 3085 rwa ib rev4 doc Page 5 of 10 16 10 2007 Installation Operational Safety WARNING Operation of electronic equipment involves the use of voltages and currents that may be dangerous to human life Note that under certain conditions dangerous potentials may exist in some circuits when power cont
8. not to scale and are intended to show relative positions of connectors indicators and controls only O RWA 3085 T 3085 rwa ib rev4 doc Page 8 of 10 16 10 2007 Maintenance amp storage Maintenance No regular maintenance is required Care however should be taken to ensure that all connectors are kept clean and free from contamination of any kind This is especially important in fibre optic equipment where cleanliness of optical connections is critical to performance Storage If the equipment is not to be used for an extended period it is recommended the whole unit be placed in a sealed plastic bag to prevent dust contamination In areas of high humidity a suitably sized bag of silica gel should be included to deter corrosion Where individual circuit cards are stored they should be placed in antistatic bags Proper antistatic procedures should be followed when inserting or removing cards from these bags Warranty amp Service Equipment is covered by a limited warranty period of three years from date of first delivery unless contrary conditions apply under a particular contract of supply For situations when No Fault Found for repairs a minimum charge of 1 hour s labour at IRT s current labour charge rate will apply whether the equipment is within the warranty period or not Equipment warranty is limited to faults attributable to defects in original design or manufacture Warranty on components shall be
9. nt these specifications are subject to change without notice 3085 rwa ib rev4 doc Page 4 of 10 16 10 2007 Technical description Signal Path RWA 3085 Block Diagram SPLITTER 7 dB ATTENUATOR 0 20dB The block diagram above shows the principal parts of the signal path for the RWA 3085 The input signal is applied directly to the input variable attenuator module which has a characteristic impedance of 75 Ohms and a maximum attenuation of 20 dB The BGY67A wideband RF amplifier hybrid module that follows the attenuator has a fixed gain of approximately 22 dB maximum 24 dB resulting in a minimum gain of 2 dB above input level at its output The output of the amplifier feeds a passive splitter module with five output ports The loss at any output is approximately 7 dB resulting in an overall system gain of from 5 dB to 15 dB Four of the outputs are available on the rear of the amplifier and one on the front panel for monitoring purposes Note that this front panel output is no different to any other output in its characteristics Power supply The RWA 3085 is equipped with two AC rectifier circuits to take advantage of the redundant AC power supplies provided in IRT s 3 RU frames Filters FIL 1 to 4 and capacitors C1 to 4 provide EMC filtering between the power supply busses and the module Resistors F to 4 provide fuse protection to the frames power supply busses in the event of a failure on the
10. rame or chassis See details in separate manual for selected frame type RF connections Connection should be made to the input and output BNC connectors using high quality 75 Ohm BNC connectors and cable so as to minimise return loss and signal reflection problems Whilst it is not necessary to terminate any unused outputs this is good practice for both EMC and return loss reasons However there should be no need to terminate the front panel monitoring output in any normal circumstances The following diagram illustrates one possible application of the RWA 3085 Redundant 70 MHz IF Fibre Optic Link RWF3085 RWR3085 70 MHz IF 70 MHz IF 70 MEZIF Y RWA 3085 Optical Optical Input Tansnitters Receivers RWF3085 RWR3085 In this example the RWA 3085 amplifier is used to provide identical signals to two 70 MHz IF fibre optic transmitters to provide a redundant optical pathway to the receive site At the receiver end a special double rear connector assembly type ZWR 3085RH is used to link the two receivers and provide one 70 MHz IF output This rear assembly may be arranged to automatically change to the second path in the event of a failure being detected by the main module or may be controlled remotely by other detectors or a manual changeover switch 3085 rwa ib rev4 doc Page 7 of 10 16 10 2007 Front amp rear panel connector diagrams The following front panel and rear assembly drawings are
11. rols are in the OFF position Maintenance personnel should observe all safety regulations Do not make any adjustments inside equipment with power ON unless proper precautions are observed All internal adjustments should only be made by suitably qualified personnel All operational adjustments are available externally without the need for removing covers or use of extender cards Pre installation Handling This equipment may contain or be connected to static sensitive devices and proper static free handling precautions should be observed Where individual circuit cards are stored they should be placed in antistatic bags Proper antistatic procedures should be followed when inserting or removing cards from these bags Power AC mains supply DC supply Earthing fuse is installed for local supply Ensure that operating voltage of unit and local supply voltage match and that correct rating Ensure that the correct polarity is observed and that DC supply voltage is maintained within the operating range specified The earth path is dependent on the type of frame selected In every case particular care should be taken to ensure that the frame is connected to earth for safety reasons See frame manual for details Signal earth For safety reasons a connection is made between signal earth and chassis earth No attempt should be made to break this connection 3085 rwa ib rev4 doc Page 6 of 10 16 10 2007 Installation in f
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