User Manual and Installation of 100000 Watts (100 kW) EIRP System


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 in your country or 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 The radio station management must assign a responsible person to the transmission equipment and installation.

CHECKLISTS! Please CAREFULLY check everything arrived. You don't want to get halfway through the installation and find out there are pieces missing and you need to stop the work


1 Stereo RDS coder audio limiter / 1 watt FM driver exciter 15V DC (SLR2B & 1WPLLB)
1 Distribution amplifier 15V DC
8 1kW FM power amplifier
2 DC to DC Lead (DC connections from SLR2B to 1WPLLB to distribution amplifier)
9 IEC AC power cord
1 MPX audio lead (audio connection from SLR2B to 1WPLLB)
9 Long BNC to BNC lead (rf connection from Distribution amplifier to 8 x 1000WNTAP)
1 Short BNC to BNC lead (rf connection from 1WPLLB to Distribution amplifier)
1 15V DC switch mode AC power supply (90w)
4 Anodised black heavy duty rack bar supports 32U for front and back of equipment
84Anodised black M6 bolts, 2 washers and nuts


FDA Aareff Folded Dipole Antenna Packing Layout FD
8 A. Boom, RF connector, 1/4 wave match and balun, marked  BLUE  and  GREEN 
8 B.  BLUE  Top fold section.
8 C.  GREEN  Bottom fold section
32 D. Joining brackets
8 E. 22mm diameter insulator
16 F. Joining clamps
80 G. M6 x 40 screw, two M6 plain washers, M6 spring washer and M6 nut
8 H. Mast fixing clamps with four M6 x 50mm screws, eight washers, four spring washers and four nuts with each clamp (shown in more detail below)

H Mast Clamps


IMPORTANT! PLEASE READ, we know it's tedious, but if you want your system to work correctly, safely and legally, it is necessary.

The antenna is the most important part of the transmission system and must be correctly installed before proceeding further and before any other transmission equipment is connected.

Ideally this antenna should be mounted at least 40 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 least 40 meters in height off ground and using 8000 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.




1. Assemble The Complete Folded Section
Take the B top fold section marked in  BLUE  and join it to the C bottom fold section marked in  GREEN  using the F joining clamps and G four M6 screws and washers. Make sure the plain washers and spring washers are applied exactly as it shows in the image below.

FDA Aareff Folded Dipole Joining Bracket 1

Fit and tighten the four M6 nuts to the M6 screws using a 10mm spanner as shown here.

FDA Aareff Folded Dipole Joining Bracket 2

When this is complete the folded section should look like this.

FDA Aareff Folded Dipole Joining Bracket 2

2. Assemble The Insulator
Pass the E 22mm diameter insulator through the tube marked  GREEN  or  BLUE  on the folded section. Push it all the way through until it appears in the middle of the tubes as shown here.

FDA Aareff Folded Dipole Insulator Prep.

3. Join The Boom And The Folded Section
Take the folded section and join it to the A boom section using the four D flat joining brackets (you can only see two on the picture, there are two more below on the other side) and six G M6 screws, plain washers, spring washers and nuts. It's important that as shown in the image below 1.) The  GREEN  and  BLUE  parts go together and 2.) The M6 screws and washers are placed exactly as shown, spring washer next to the nut and the plain washer next to the tube.

FDA Aareff Folded Dipole Joining Folded Section To Boom.

Using the 10mm spanner, tighten the M6 screws between the folded section and the boom. There should be no slack in the whole assembly, it should be tight, firm and rigid.

The folded dipole is now ready to mount to the tower or mast.


If it all possible you should try and assemble the whole eight way half wave antenna system horizontally on the ground as shown below to a long 38mm diameter tube.

This is much easier and safer. Then when it's all complete, hoist the complete 38mm tube with all the antennas and booms fastened to it, up to the tower. Then clamp by whatever means you have (depends on the tower construction) the whole 38mm tube and antenna assembly vertical to the tower.

1. Mount the eight half wave antennas and booms to the mast using H the boom to mast / tower mounting clamp assemblies. 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 with exactly 288cm between them in order for the system to work properly and give maximum gain to the horizon.

2. Connect the eight long 40m phased LMR600 antenna cables to each of the antenna sockets using the 90 deg elbow connector. IMPORTANT! DO NOT CUT BACK, ADD OR CHANGE THE 40m ANTENNA CABLE LENGTHS. To get maximum radiation to the horizon it is important that the signal from each amplifier to each antenna arrives at exactly the same time, this can only happen if the cables are exactly the same length.

3. 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.

4. Securely fix the 8 cables using PVC tape or large cable ties to the mast. 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.

5. Make sure that all fixings, brackets and clamps are tight and are not going to work loose over time with wind.

6. On completion of the antenna installation you should have eight 40m cables ready to plug into each of the eight large RF power amplifiers.





If you need to extend or change the antenna cables, please refer to the section near the end of this document "MODIFYING ANTENNA CABLE LENGTHS"


This system is ordered, supplied and delivered for a specific frequency. If you need to change the power level please refer to the user manual for 1W PLL FM STEREO DRIVER / EXCITER WITH AUDIO PROCESSING at

1. Use the supplied M6 screws, nuts, washers and rack rail bars to clamp the Distribution Amplifier (8WDA19), the Driver (1WPLLB) and the eight 1kW power amplifiers together as shown in the picture. 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.

2. On the back panel of the eight big amplifiers locate the OUTPUT 1kW 50 OHM socket and connect to it the eight 40 meter cables coming down from the antenna mast. You will find that some of 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.

3. Using the eight long BNC to BNC leads supplied connect the 1 WATT RF INPUT from each of the eight 1kW power amplifiers to the eight 1W outputs on the Distribution Amplifier (8WDA19). 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.

4. Use the remaining short BNC to BNC lead supplied to connect the 1 WATT RF OUTPUT from the 1WPLLB driver / exciter to the Distribution Amplifier 8WDA19 unmarked 1 watt input as shown in the picture.

5. Plug the small 15V DC power supply adapter into the MODEL 1WPLLB DC INPUT. Connect the 1WPLLB DC AUX OUT to the MODEL SLR2B DC AUX OUT using the short black DC to DC Lead. Connect the SLR2B DC INPUT to the Distribution Amplifier 8WDA19 using the short black DC to DC Lead. Then connect the AC mains power to 15V power supply adapter.

6. Connect mains AC power to the eight 1kW 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.

7. Finally, provide an audio input to the SLR2B Stereo Generator and Limiters and you are "ON AIR".



Power Supply 90-260 VAC 50/60 Hz 14.8KVA Max. (8 x 1850VA max AC IEC mains inlets and 1 x 100VA max IEC AC mains inlet)
Transmitter RF Power Output 8 x 1kW (8kW Total) +/- 0.5 dB from -20 to +40 Deg C
Freq Stability Better than +/- 2 KHz from -20 to +40 Deg C +/- 300 Hz typ.
Freq Range 100 KHz steps from 87.5 to 108 MHz
Deviation Sensitivity Stability +/- 2 % max
Spurious Emissions Better than -75dB ref to carrier
Harmonic Emissions Better than -70dB ref to carrier
RF Bandwidth 200 KHz (+/-100 KHz @ -40 dB rtc)
Output ConnectorsN type 7-16 DIN
RF Ruggedness 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
Audio Distortion Better than 0.1 % at +/-75 KHz dev
Stereo Crosstalk 35 dB
Pre-emphasis 50 uS (75 uS USA) or None
Pilot Tone Freq 19 KHz
Pilot Tone Stability 0.2 Hz
Antenna Polarisation Vertical
Antenna Gain0.9λ Spacing (2.88 metres) 9.9 dB + (Isotropic Gain) 2.15 dBi = 12.05 dBi
Antenna Cable Loss -1.027 dB 40m LMR600 foam cable
Radiated PowerRadiated power from the antenna calculated using eight 40 mt (130 Ft) of LMR600 (-1.027 dB @ 100 MHz) foam antenna cables and eight half wave broadband folded dipoles (+2.15 dBi) spaced at 2.88 mt (+9.9 dB)
- Effective Radiated Power (ERP) = 8000W + (9.9 dB -1.027 dB = 8.873 dB) = 61714 watts (61.7 kW)
- Effective Isotropic Radiated Power (EIRP) = 8000W + (2.15 dB + 9.9 dB -1.027 dB = 11.023 dB) = 101248 watts (101.2 kW)


When writing this manual there was no EU directive regarding the EMC compatibility of Band II VHF broadcast antennas, however in our view there are some potential EMC compatibility issues that need to be addressed when installing this antenna system. On completion of the antenna installation check;


European Union

We hereby declare that this equipment complies with;
• ETS 300384 European Telecommunications Harmonised Standard when used with an audio compressor limiter supplied and tested by Aareff
• EN 301489-11 V1.3.1 (2006-05) EMC Electromagnetic Compatibility when used with 1 meter AC mains cord supplied. If the installation engineer needs to extend this cord, this and the audio input cable should be no more than 3 meters in length to remain in compliance with EMC directive.
• 2006/95/EC Directive (2006-12) LVD Low Voltage Directive.

Equipment compliance is possible using equipment from and in conjunction from other manufacturers, but since this is beyond the control of Aareff Systems, Aareff Systems cannot or be expected to guarantee compliance in this situation.

United States

The following list are the FCC technical requirements for this transmitter. We confirm and verify that this transmitter complies with the technical requirements.

47 CFR Chapter I Federal Communications Commission sections:
• 73.1560, 2.1046 RF Power
• 73.1545, 2.1055 Frequency Stability
• 73.317, 2.1049 (e)(3) Emission Limitation, Emission Mask
• 73.317, 2.1057, 2.1051 Emission Limits, Spurious Emissions at Antenna Terminal
• 73.317, 2.1057, 2.1053 Emission Limits, Field Strength of Spurious Emissions


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.

This system is supplied with eight 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 both signals from the eight amplifiers arrive in phase. This can only happen if the total lengths of each of the cables from the power amp connectors to the antenna connection points 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.


Making the antenna cables longer will cause a small amount of additional power loss and due to this the radiated power from the antennas will fall proportionally as the cable lengths are increased. The table shows the values of ERP and EIRP calculated using LMR600 at 100 MHz for additional cable lengths.

It's important to note that additional transmission distance gained by increasing the tower height completely outweighs the power loss from longer cables by a large margin. Given this, you should never be deterred from using longer cables in order to increase tower height.

Metres Feet ERP (kW) EIRP (kW)
40 131 61.7 101.2
60 197 56.9 93.4
80 262 52.5 86.1
100 328 48.4 79.5
120 394 44.7 73.3
140 459 41.2 67.6


All components used in this apparatus are RoHS compliant and do not contain above the specified limits in any of the following restricted substances:

• Lead
• Hexavalent Chromium
• Mercury
• Cadmium
• Polybrominated Biphenyls (PBB's)
• Polybrominated Diphenylethers (PBDE's)


This apparatus must NOT be disposed of with other domestic waste.

We are fully committed to maintaining our responsibilities to the environment. Owners of apparatus that has reached the end of it's useful life can return it to us for recycling, recondition, reuse or proper disposal. You will be required to pay lowest cost postal service available to ship the apparatus to us. Before shipping please contact us for more important information.


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 Systems Limited, 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.


ALL RIGHTS RESERVED. Aareff is a trademark of Aareff Transmission Systems. All contents of this document including, but not limited to the images, logos, text, illustrations are protected by copyrights, trademarks and other intellectual property rights which are owned and controlled by Aareff Transmission Systems or by other parties that have licensed their material to Aareff Transmission Systems. This document in part or whole may not be copied, reproduced, republished, uploaded, posted or distributed in any way, including by e-mail, ftp or any other electronic means

Every care has been taken in the preparation of this document, errors in content, typographical or otherwise, may have occurred. If you have comments concerning its accuracy, please contact Aareff Systems Limited (UK)