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i. The various pieces of equipment in this document are only for use permanently at a pre-defined location with a license or authorisation from the radio spectrum regulator of the EU member state.
ii. The installer must have competent RF engineering skills at their disposal, be EMC aware and understand radio frequency systems. The final installation should be in accordance with the site engineering document at http://www.aareff.com/ETR132.pdf The radio station management must assign a responsible person to the transmission equipment and installation.
TRANSMITTER PACKAGE CHECKLIST
STEREO CODER AUDIO LIMITER / 1 WATT FM DRIVER EXCITER 15V DC (ALSCB & 1WPLLB)
DISTRIBUTION AMPLIFIER 15V DC
200W FM POWER AMPLIFIER
DC LEAD TO DC LEAD (DC CONNECTIONS FROM ALSCB TO 1WPLLB TO DISTRIBUTION AMPLIFIER)
IEC AC CORD
MPX AUDIO LEAD (AUDIO CONNECTION FROM ALSCB TO 1WPLLB)
BNC TO BNC LEAD (RF CONNECTION FROM 1WPLLB TO DISTRIBUTION AMPLIFIER TO 4 x 200WNTAP)
15V DC SWITCH MODE AC POWER SUPPLY (60W)
2 X 19 INCH 6U CLAMPING BARS AND 12 X M6 SCREWS NUTS AND WASHERS
ANTENNA PACKAGE CHECKLIST
2 ELEMENT YAGI BOOM 2.34 m LMR400 + 0.53m RG59 CABLES
MAIN ELEMENT TUBES
M4 SCREWS NUTS AND WASHERS
RF SPLITTER BOX
MAST FIXING CLAMPS
40 METERS LMR400 PHASED MATCHED CABLE WITH PLUGS FITTED
IMPORTANT ! PLEASE READ THIS PART CAREFULLY.
The antenna is the most important part of the transmission system and must be correctly installed before proceeding further and before any transmission equipment is connected
Ideally this antenna should be mounted 20 meters high and clear of any surrounding objects to get maximum range and more importantly to reduce risk of radio frequency radiation to personnel. When mounted at 20 meters in height off ground and using 400 watts of transmitter power, power flux density measurements made at ground level directly under the antenna show less than 1 W/m2. Several European countries use a value for the power flux density of 10 W/m2 as a basis for considering whether or not an area is safe. The issue of radio frequency radiation limits is a contentious one and work in this field is continuing worldwide. Under no circumstances should the antenna be mounted and used at ground level or within a few meters of personnel.
TOOLS REQUIRED FOR ANTENNA CONSTRUCTION
PVC insulation tape and/or Self Amalgamating Tape
Tape Measure with mm
Medium Size Pozi Screwdriver
7 mm Spanner
11 mm Spanner
13 mm Spanner
A secure mounting mast or pole with a diameter of 45-50mm and clear length of at least 7 meters for mounting the dipoles to.
Using the 8 x M4 SCREWS NUTS WASHERS AND PLASTIC SPACER mount the two MAIN ELEMENT TUBES to each of the cable terminal boxes YAGI BOOM. Make sure they are screwed tight.
Mount the REFLECTOR TUBE to the YAGI BOOM using the screw and nut already fitted to the boom. Make sure it is screwed tight.
Mount the 4 complete 2 element yagi antennas to the mast using the clamps provided. The MAIN ELEMENT TUBES should be point to the direction you want the strongest signal. It is IMPORTANT for correct operation that the dimensions on the diagram are followed as closely as possible, all antennas must be directly above each other. ALL ‘TERMINAL BOXES’ MUST BE FACING THE SAME WAY for the system to work properly and give maximum gain to the horizon.
Mount one of the RF SPLITTER BOXES between the top antenna and the next antenna down from the top. Mount the other RF SPLITTER BOX between the bottom antenna and the next antenna up from the bottom.
Connect the 2 x 40m phased LMR400 antenna cables to the centre connectors of each of the two RF SPLITTER BOXES, MAKE SURE THE CONNECTORS ARE SCREWED PROPERLY AND TIGHT. Wrap PVC or self-amalgamating tape tightly around and all over the connectors to make them water resistant.
Connect the four cables from the antennas to remaining connectors of the RF SPLITTER BOXES.
IMPORTANT! DO NOT CUT BACK, ADD OR CHANGE THE ANY OF THE ANTENNA CABLE LENGTHS. To get maximum radiation to the horizon it is important that the signal from transmitters and amplifiers to each antenna arrives at exactly the same time, this can only happen if the cables are exactly the same length.
Securely fix the 2 cables using PVC tape or large cable ties to the mast as shown in the diagram. Make sure the cables are not going to flap around in the wind. Once again, do not cut back any excess cable. To make the cabling look tidy, it is okay to coil the cable.
Make sure that all fixings are tight and are not going to work loose over time with wind.
On completion of the antenna installation you should have 2 x 40m cables ready to plug into each of the large RF power amplifiers.
TRANSMITTER SET UP
Arrange the units as shown in the photo.
Use the supplied M6 screws, nuts, washers and rack rail bars to clamp the Distribution Amplifier (4WDA19), the Driver (1WPLLB and ALSCB) and 200W Power Amplifier together. The power amplifiers are much heavier, so these should be at the bottom. The Driver and Distribution Amplifier are light and will suspend in the air and do not need any support at the back.
Alternatively you can mount the units in a professional 19 inch enclosure and integrate the units with other equipment that you supply.
Connect the 200W TO ANTENNA output from each power amplifier to the three 40 meter cables coming down from the dipole antennas. If you find that the cables are longer than necessary, DO NOT shorten these leads as they are a specific phased length. It is okay to coil and cable restrain them to make the arrangement tidier.
Using the three of the 1m leads supplied terminated with BNC connectors connect the 1W INPUT from each power amplifiers to the three of 1W outputs on the Distribution Amplifier. The remaining spare 1W output on the Distribution Amplifier is left unconnected. You will find that the supplied leads are longer than necessary, DO NOT shorten these leads as they are a specific phased length. It is okay to coil and cable restrain them to make the arrangement tidier.
Plug the small 15V DC power supply adapter into the ALSCB DC INPUT. Connect the ALSCB DC AUX OUT to the 1WPLLB DC IN using the short black DC to DC cable. Connect the 1WPLL DC AUX OUT to the Distribution Amplifier 4WDA19 using the short black DC to DC cable. Then connect the AC mains power to 15V power supply adapter.
Connect mains AC power to the three Power Amplifiers. The driver will lock after a few seconds and Power Amplifiers should indicate power on the front panel meters. The switch on the front panel of the Power Amplifiers should be set to ‘FWD’. If the Power Amplifiers have a problem starting up, remove the AC from the 15V power supply adapter for 5 seconds and then re-apply it, this will give it a clean start and the Power Amplifiers should power up.
Provide an audio input to the ALSCB Stereo Generator and Limiters and you are on air.
CHANGING FREQUENCY AND POWER LEVEL
This system is ordered, supplied and delivered for a specific frequency. Changing the frequency in this system is limited by the yagi directional antennas. The frequency can be changed in the driver by +/- 3 MHz from the ordered frequency. So for example if the system was ordered for 102.1 MHz, it would be possible to change the frequency for use between 99.1 and 105.1 MHz. Beyond these limits there would be excessive reflected power and the 200W amplifier would start power foldback.
If your frequency change is within +/-3 MHz, or you require a RF power or modulation level change, please refer the user manual for 1W PLL FM STEREO DRIVER / EXCITER WITH AUDIO PROCESSING at http://www.aareff.net/1wpllsl19/ password 1wpllsl19
200W POWER AMPLIFIER OPERATION
For amplifier operational information please refer to the the user manual for the 200 WATT BAND II VHF FM POWER AMPLIFER at http://www.aareff.net/200wntap/ password 200wntap
90-260 VAC 50/60 Hz
Transmitter RF Power Output
2 x 200 Watts (400 Watts Total) +/- 0.5 dB from -20 to +40 Deg C
Better than +/- 2 KHz from -20 to +40 Deg C +/- 300 Hz typ.
100 KHz steps from 87.5 to 108 MHz
Freq Adj. Accuracy
+/- 50 Hz
Deviation Sensitivity Stability
+/- 2 % max
Better than -75dB ref to carrier
Better than -70dB ref to carrier
200 KHz (+/-100 KHz @ -40 dB rtc)
SO239 (or optional N type)
Any VSWR any phase any length of time
Audio Input Sensitivity
0 dBu 775 mV rms adjustable
Audio Inputs Connector
Phono/ RCA socket
Audio S/N Ratio
Better than 70 dB
Audio Freq Response
30 Hz to 15 KHz +/- 0.5 dB
better than 0.1 % at +/-75 KHz dev
50 uS (75 uS USA) or None
Pilot Tone Freq
Pilot Tone Stability
Antenna Cable Loss
-1.8 dB 40m LMR400 foam cable
Antenna RF Power Output
3200 Watts ERP with a directivity of 3dB +/- 0.5 dB from -20 to +40 Deg C using 40 m of LMR400 foam antenna cable and antennas supplied.
INCORRECT ANTENNA CABLE LENGTHS
This is when the lengths of the antenna cables from each of the power amplifier RF outputs to the antenna junction boxes are different lengths.
In this situation signals will arrive at the dipoles at different phases and this will cause a cancellation effect to the combined signal. In worst case the signal gain to the horizon could disappear completely. In best case some of the signal will be radiated, but it will be very poor and inefficient.
CORRECT ANTENNA CABLE LENGTHS
This system is supplied with two identical antenna cable lengths that are phased matched perfectly. If for some reason you need to extend these cables, this can be done, but in the end result they must still be exactly the same length for the antennas to work correctly.
It is important that all four signals from all four amplifiers arrive in phase. This can only happen if the total lengths of each of the cables from the power amp connectors to the dipole junction boxes are exactly the same length.
It does not matter how long the cables are, how many cables you use or how many couplers are used to connect the cables together, all that matters is that the total lengths are exactly the same. In practice we have found that a difference or tolerance of up to 2 cm between each cables is acceptable, but no more than this or the signal will not give maximum gain to the horizon.
All components used in this apparatus are RoHS compliant and do not contain above the specified limits in any of the following restricted substances:
Polybrominated Biphenyls (PBB’s)
Polybrominated Diphenylethers (PBDE’s)
It is the customer’s responsibility to check relevant laws, directives, regulations and licensing requirements before putting this product into service with an antenna system. You, the customer agree to defend, indemnify and hold harmless Aareff Transmission Systems, it’s employees and agents, from and against any claims, actions or demands, including without limitation legal and accounting fees, alleging or resulting from improper or unlawful use of this product.
© 2016 Aareff Systems Limited. ALL RIGHTS RESERVED.
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