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ASA750 System Launch Amplifier
The Antiference Cascade system has been developed with the installer in mind, making the system versatile and professional. This approach allows the system to be installed quickly, neatly and with minimal commissioning time. The ASA750 amplifier is designed to provide all the required frequencies for an IRS installation. The ASA750 System launch amplifier has 7 separate inputs each with a high quality interstage gain control which allow precise settings and maintains a low noise figure. The amplifier has 5 outputs, all the terrestrial signals are combined on to a single output, all other outputs are fixed polarity IF outputs. The launch amplifier has an incorporated 22 kHz tone generator which makes it compatible for use with either a Quad or Quattro band LNB. The ASA750 amplifier is designed to be used in-conjunction with the ATT200 2-way cascade taps and splitter , these taps come in 25dB, 20dB, 15dB, 10dB and the ACS525 splitter. The Taps and splitter have a line through power facility with line power indication. A switch mode power supply is fitted in a separate housing to ensure a cool and prolonged operational life as well as reducing the risk of impulse noise being generated and corrupting the wanted digital signals.
Features
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Quality Interstage gain controls on all inputs. UHF Auto Line powering with LED indication, If a Log-periodic aerial is installed a DCB01 should be fitted. Switched Cascade Line powering for Cascade multiswitches with LED indication, ensure the line power is switched off if the amplifier is to be used with the ISYS5 stand alone switches. 22 KHz tone generator built-in Quad / Quattro compatible Terrestrial –30dB Test Point 2000mA Cascade Line power capability 10 switches maximum 100mA UHF masthead line power Colour code inputs and outputs Switch Mode Power Supply Easy Mount Fixings
Installation
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Designed for continuous use. Install in a dry, well ventilated area free from insulation material. Always securely mount the amplifier horizontally on a wall or fixed board that allows easy routing of the cables and free air flow. Do not allow the unit to hang on its cables as this may damage the connections or the circuit board.
Once all of the coaxial connections have been made, plug the unit into the mains supply and switch on. The red power LED will illuminate. If not illuminated check the mains supply and 3.0amp fuse in the plug. It is recommend that the output launch level does not exceed 115 dBµV after de-rating for 5 analogue channels and 6 digital muxes and for IF optimum IF output is 110dBµV . To set the output put your spectrum analyser on the –30dB resistive monitor point and set the analogue levels to 80dBµV the DTT muxes will be approximately –20dB. This information can be ascertained from the BBC transmitters guide. The electrical supply arrangements for the amplifier should be in accordance with BS 7671 (lEE Wiring Regulations) The amplifier may be connected to the mains using either a switched fused connection unit, or a plug and socket connection. The fused connection unit method reduces the risk of accidental disconnection and is recommended.
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To connect, proceed as follows: Prepare the free end of the flexible cord to suit the wiring device (fused connection unit or plug) to be used. The cord may be shortened first it desired. Connect the brown wire to the phase (live or L) terminal of the fused connection unit or plug, and the blue wire to the neutral (N) terminal. Neither wire of the flexible cord should be connected to the protective earth terminal.
A 3 amp fuse (to BS 1362) should be fitted in the fused connection unit or plug. If the amplifier is not connected using a fused plug or connection unit it must be protected at the final distribution board by a fuse or MCB of rating not exceeding 6A.
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Earth bonding The ASA750 has an earth bonding post which provides the facility to connect to the buildings PME, the earth post will accept up to 6mm2 cable. All inputs and outputs need to be earth bonded using a 4mm2 Green/Yellow circuit protective conductor to comply to EN50083-1 and the CAI Codes of Practice. The Antiference AEB01/50 Earth string is a convenient and cost effective way to earth bond any system, this does away with the need to make extra link leads which saves time on the installation.
Fitting F-Connectors to the cable Fit a professional crimped F-connector with the correct tool, following the dimensions in the diagram below.
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Ensure that the crimp connector is the correct size for the Cable.
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Fit the F-connector. Check that there are no whiskers of braid shorting the centre conductor and crimp.
Strip 10 mm of the plastic cable sheath to expose the screening braid (fig.1). Fold the coaxial braid back over the cable sheath neatly and evenly (fig.2). Remove any foil screening to expose the dielectric. Trim the dielectric to expose a maximum 8 mm of centre conductor (fig.3). Do not allow the centre conductor to exceed 8 mm as it may short inside the F-female socket.
Weak UHF signals
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Select an appropriate Benchmarked Aerial determined by a site survey.
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Antiference UPF15U 15dB gain or UPFR25U variable gain units are ideal for UHF pre-amplification and are designed to amplify digital and analogue signals. These models are fully screened and should be fitted as near to the aerials as possible preferably within 2m.
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Power up ASA750, the auto line provides 12V facility, the green LED is illuminated. If the UHF input is shorted out the Line power is Switched off automatically and the LED will extinguish.
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To reset Line power , turn off ASA750 from the mains supply.
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Clear short-circuit then turn the mains supply back on the amplifier, the Green LED will then illuminate providing 12V again.
Where the UHF signals are weak, or long cable runs from the aerial to the amplifier unit cannot be avoided, fit a fully screened masthead amplifier. Do not over-amplify or use too high a gain model as overload may occur.
Installation Screening and accessories EN50083-2 All digital installations should be installed using double screened coaxial cables and screened accessories only. Digital signals are susceptible to impulse noise which causes the images to pixelate or block. Antiference offer a full range of fully screened accessories
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Benchmarked cable A100. Full range of Screened wall plates
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Technical Specifications
Technical Specification Part Number
ASA750
Inputs
3 Terrestrial, 4 IF Polarities
Input Centres
25mm
Outputs
1 Terrestrial . 4 IF Polarities
Output Centres
16mm
UHF
470-862MHz
DAB
217-230MHz
FM
88-108MHz
Satellite
950-2150 MHz
UHF Gain
42dB±2dB 20dB (ISGC)
DAB Gain
42dB±2dB 20dB (ISGC)
FM Gain
42dB±2dB 20dB (ISGC)
Satellite
38dB±2dB 20dB (ISGC)
Noise Figure
<5dB
22 KHz Tone Generator
0.6V pp
Max input *
79dBµV
High Quality Linear Input Level controls
on all inputs
Max. UHF Output*
115dBµV
Max. Sat Output
115dBµV
UHF Line Power
100mA
LNB Line Power
500mA
Cascade Line Power Switchable
2A
Isolation Terr-950 MHz
>30dB
Rejection 862-900-950 MHz
>25dB, >30dB
Rejection 385-470 MHz
>30dB
Rejection 230-385 MHz
>30dB
Rejection 108-230 MHz
>25dB
Monitor Pont UHF Line Power
-30 Resistive Monitor Point 100mA with Green LED located next to UHF input
Cascade Line power Switchable Power Supply
2A with Green LED indication 180-264V AC10% 50Hz with RED power on indicator (SMPS)
Earth Post
6mm2
Connectors
IEC16069-24(f)
Fitted Mains Plug
3A BS1362 EN50083-5 (IMA60dB), EN50083-3 (IMA3 35dB)
Antiference reserves the right to change or alter specifications and features without prior notice. E&OE. Antiference ©2013. The contents of this instruction leaflet are copyright. Copying or reproduction of any pictures or text is forbidden without prior permission.
Antiference Ltd Fradley Distribution Park , Wood end Lane, Fradley Park, Lichfield, Staffordshire, WS13 8NE TEL : 01675 465487 www.antiference.co.uk
[email protected]
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