INTENDED USE

i. The equipment in this document is 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 EU and the US techincal parameters and the maximum audio deviation level for the full composite MPX signal should be adjusted to b an absoulte maximum for +/-75 KHz.

USA REQUIREMENTS. Section 2.1047 Modulation characteristics and section 2.1049 Occupied bandwidth at:
http://www.gpo.gov/fdsys/granule/CFR-2011-title47-vol1/CFR-2011-title47-vol1-sec2-1047/content-detail.html

EU REQUIREMENTS. Section 8 Audio Processing Limiter at:
https://www.aareff.com/ETR132.pdf

PACKAGE CHECKLIST

Qty	Description	Item
1	1W FM Stereo with RDS and Audio Processing Exciter 15V DC (ALSCXB & 1WPLLB)
1	1000 FM Power Amplifier
1	DC to DC Cable (DC connections from ALSCXB to 1WPLLB)
1	IEC AC Power Cable
1	MPX Audio Cable (Audio connection from ALSCB to 1WPLLB)
1	N Type to BNC Cable (RF connection from 1WPLLB to 1000WNTAP)
1	15V DC Switched Mode AC Power Supply
1	Rack Rails

ASSEMBLING THE TRANSMITTER

1. Use the supplied M6 screws, nuts, washers, and rack rail bars to secure the Driver (1WPLLB and ALSCB) and the 1000W Amplifier together as shown in the image. The Amplifier is much heavier, so it should be at the bottom. The Driver is lightweight and should be suspended in the air without any support at the back.

Alternatively, you can mount the units in a 19-inch professional cabinet and integrate them with other equipment you have.

2. Connect the 1000W (1kW) RF OUTPUT of the Amplifier to 50 ohm antenna cable or dummy load

3. Using the supplied N Type to BNC cable, connect the 1 WATT RF INPUT from the Amplifier to the 1 WATT RF OUTPUT on the Driver.

4. Using the MPX Audio cable, connect the ALSCXB MPX OUTPUT to the 1WPLLB MPX INPUT on the Driver.

5. Connect the ALSCXB DC AUX OUTPUT to the 1WPLLB DC INPUT using the short black DC to DC cable on the Driver

CONNECT THE ANTENNA TO THE RF OUTPUT

The ANTENNA is very important, check this is installed and ready to use. DO NOT EVER POWER A TRANSMITTER OR RF AMPLIFER WITHOUT AN ANTENNA CONNECTED.

PLUG THE ANTENNA CABLE INTO THE TRANSMITTER. Make sure this tight as poor and loose connections can cause RF burns to personnel, severe noise to the transmission and excessive RF bandwidth. A transmitter should never be operated without an antenna. DO NOT PLUG IN THE POWER CORD AT THIS STAGE.

Under NO CIRCUMSTANCES should the antenna be mounted and used at ground level or within a few meters of personnel.

A tuned antenna with the 50 ohm coaxial cable should be used. This should give a return loss ideally of 16dB (SWR 1.4) or better at the operating frequency. The RF plug should be PL259 (UHF) or N type, depending which is fitted to the FM transmitter.

Ensure that all antenna connections are sound, this is important as poor connections and soldered joints can cause RF burns to personnel, severe noise to the transmission and excessive RF bandwidth. Do NOT connect the antenna to the transmitter yet.

Ideally the antenna for this transmitter should be ideally 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 1000 watts of transmitter power, power flux density measurements made at ground level directly under the antennas described above 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.

SET THE RF POWER OUTPUT TO ZERO

If you are connected directly to an antenna, as a safety precaution adjust VR2 RF PWR. ADJ fully counter-clockwise. In this counter-clockwise position the transmitter output will have no RF output, it is reduced to zero. IMPORTANT! This is to prevent interference to the radio spectrum if you are not on the correct frequency or not set up properly.

POWERING UP THE DRIVER

Plug the small 15V DC power supply into the ALSCXB DC INPUT on the Driver and to the AC mains. DO NOT CONNECT THE 1000W (1kW) AMPLIFIER to the AC mains at this point

The Driver meter should illuminate RED, then after a second or so turn to BLUE. When the meter is BLUE the Driver is PLL locked on to the DDS reference frequency. If it flashes RED and BLUE and you see various numbers scrolling in the frequency display, don't panic, this is normal, it is doing a recalibration for its new environment and temperature. Please give it a few minutes to complete this.

SET THE FREQUENCY

Locate the two small frequency up and down buttons. These small buttons are used for stepping up or down in selecting a frequency. As you press the up or down buttons, you'll notice the frequency on the digital display change. It's important to select your frequency correctly, if you don't, it's possible to transmit on an unauthorised frequency.

CHECKING THE AUDIO DEVIATION

During manufacture and test the audio deviation will be set broadcast standard line of +8dBu peak for +/-75KHz peak deviation at 88.0 MHz. There is a high possibility that this will not be the same level as the audio source feed from your studio, external audio limiter and/or processing device, MPX stereo generator and/or RDS generator. You need to check this as excessive deviation can cause adjacent channel interference to other users of the radio spectrum.

WITHOUT TEST EQUIPMENT

Audio deviation is difficult to measure without proper test equipment and the method described here cannot replace proper test equipment, however if your regulator permits this method it is possible to check the deviation very close to correct level by using a relative comparison. Use a radio receiver tuned to a known high quality, high budget and reputed radio station. For example in the United Kingdom this would be a national BBC station. Feed the audio output of the radio receiver into some VU meter or level indication on a mixer or other audio equipment. Look carefully at the metering level peaks. You will notice the meter peak constantly at a specific level, make a note of this. Place the antenna of radio receiver as close as possible to your transmitter enclosure. Re-tune the radio receiver to your transmitter frequency. Look at the metering again. Adjust VR1 DEV. ADJ. so that your audio constantly peaks at a little lower than the level you noted. When you have achieved this your deviation is a little lower or close to the legal level. The reason for this setting is that it is legal to under deviate, but not-legal to over deviate, with a lack of test equipment

It is better to be under deviating in order to prevent adjacent channel interference until you have proper test equipment available.

WITH TEST EQUIPMENT

Connect the transmitter via a coupler and dummy load to a Spectrum Analyzer, Modulation Analyzer or Deviation Meter. Adjust VR2 RF PWR. ADJ fully ANTI-clockwise. Adjust VR1 DEV. ADJ. for the correct deviation on the test equipment.

POWERING UP THE AMPLIFIER

1. IMPORTANT! A properly tuned 50 ohm antenna should be connected to to the main 1kW RF OUTPUT on the Amplifier. DO NOT POWER UP THE AMPLIFER WITHOUT AN ANTENNA CONNECTED

2. The N type to BNC cable should be connected between the 1 WATT RF INPUT from the Amplifier and the 1 WATT RF OUTPUT on the Driver.

3. The Driver should be powered, the meter showing blue and locked to frequency

If the above are confirmed, power up the Amplifier by connecting the IEC mains cable to the AC supply.

The Amplifier meter will light up blue and you will hear the cooling fans. Set the front panel switch to REF and the meter should read less than 40W.

If the meter is 40W or more, then there is a problem with the antenna, antenna cable or connectors and you should power it down and check the antenna system for faults. Then return to this setion and power up again.

If the meter is less than 40W, then the antenna system is working fine. In this case, set the front panel switch to FWD and the meter should read close to 1000W. If this is the case, everything is working perfectly, the equipment can remain powered and you are ON AIR, permanently

IMPORTANT! ALWAYS KEEP FANS AND VENTILATORS CLEAN

SET THE RF POWER OUTPUT LEVEL

Locate the power control VR2 RF PWR. ADJ. If you followed the previous paragraphs, this power control should be in the counter-clockwise. In the fully clockwise position the transmitter output is at maximum RF output. Check the switch on the front panel is set to FWD. Adjust this control to the desired power level. THE TRANSMITTER IS NOW ON AIR!

USB PC/RDS CONTROL

Download our free PC app that connects 'plug and play' to the transmitter / PLL DDS exciter via USB. You can see the PLL status and change the frequency and power directly from the PC interface. If you choose to add the optional RDS card, you can also change the PI, PTY and scrolling text of the radio from the interface.

Below are the download links for Windows:
https://www.aareff.com/1wpllm/pll14.4/pll14.exe
https://www.aareff.com/1wpllm/pll14.4/pll14.zip

By clicking on these links, Windows may show you a warning that the software is from an unknown publisher. We assure you that we wrote the apps and the files are perfectly safe, virus-free and come from our registered domain www.aareff.com, which you can verify at https://lookup.icann.org/en/lookup

Normal state when the device is connected: the PLL is LOCKED with an output power of 0.85W and a PLL phase of 2.33V

This shows what happens if the device loses its lock. We simulated a failure by placing our fingers on the oscillator coils.

This shows the return to normal with the user command FREQ:106.7 typed in the input box below. A value between 87.5 and 108.0 MHz can be set.

After pressing 'Send:' the display returns UPDATED FREQ 106.7 along with other technical information. This causes the transmitter to change frequency.

This shows another command, RDS-PI:ABCD typed for devices with the RDS card.

After pressing 'Send': the display returns UPDATED RDS-PI:ABCD instantly updating the RDS PI code.

This shows two additional examples of RDS commands:
RDS-TEXT:[write your message here]
RDS-PTY:[number from 0 to 31]
Text is plain ASCII up to 60 chars and valid PTY Codes shown below.

NORMAL OPERATION

On units with fans fitted should hear the cooling fan. The fan draws air into the front and exits the warm air through the rear vents. It is important to keep these vents clear. The front meter should illuminate in BLUE

The front panel meter should show 1000 watts. If the transmitter power is set to full but you are only seeing 15 to 20% of the power on the meter, it is almost certain, 99% certain, you have a serious antenna problem such as shorted wires or broken wires in the coaxial cable connector or the antenna is incorrectly assembled. This is normal and it is the transmitter reducing the power automatically to protect itself from permanent damage. If you resolve the connector, shorted or broken wires or antenna assembly, the the power will return to 100%.

RF Specification

All stated measurements were made at 220VAC at 27 Deg. Celsius ambient temperature unless stated.

Power Output	Adj. 1-1000 Watts into 50 ohms
Spurious Emissions	Less than -75 dB ref to carrier
Harmonic Emissions	Less than -70 dB ref to carrier
Freq Stability	+/- 1 KHz max. typ. +/-300 Hz
Deviation Sensitivity Stability	+/-2 % max
Freq Fine Adj	> +/- 1000 Hz
Freq Range	87.5 to 108 MHz in 100 KHz steps
Out of Lock RF Muting	Less than -70 dB ref to carrier
Residual AM	Less than 0.5 %
Synchronous AM	Less than 0.5 %
RF Ruggedness	Any VSWR phase or length of time
Output Connector	DIN-716
Operating Temp	-20 to +40 Deg C

AF Specification

Pre-emphasis	(50 uS/ 75 uS/ None) Selectable
Audio Input Connector	XLR True Balanced 600 ohm No Ground Ref./ Floating
Audio Input Sensitivity	+4 dBu for +/- 75 KHz dev.

Version	MPX	Stereo and Audio Processor
Signal To Noise Ratio	80dB	65dB
Frequency Response	30Hz-76KHz	30Hz-15KHz
Audio Distortion	Better than 0.1% / 60dB THD	Better than 0.1% / 60dB THD

AC Specification

Input Voltage	90-264 V AC 135-370 V DC 47-63 Hz
Input Power	1400W for 1000W RF OUT with RF SWR less than 1.5
Working Humidity	20-90% RH non-condensing
Safety Standards	UL60950-1 TUV EN60950-1 BSMI CNS14336 CCC GB4943 J60950-1 approved
EMC Emission	Compliance to EN55022 class B EN61000-3-2 3 FCC PART 15 / CISPR22 class B CNS13438 class B GB17625.1
EMC Immunity	Compliance to EN61000-4-2 3 4 5 6 8 11 light industry level criteria A

MAINTENANCE

The only maintenance the amplifier needs is some periodic cleaning. Following a number of weeks of continuous 24/7 use (specified below), the amplifier should be shut down and disconnected. A technician or engineer needs to take of the top lid by removing the self tapper screws. Using a soft new and clean paint brush with a vacuum clean hose, the dust should be gently brushed and sucked away from all areas inside. Pay particular attention to the actual fans at the rear and the fan vent at front.

The table below shows the recommended number of weeks cleaning should be done for some typical environmental areas.

WEEKS	SALTY	SANDY	DUSTY	PUBLIC	CLEAN
4
6
8
12

Do not adjust any factory set internal controls.

Under NO CIRCUMSTANCES should any adjustments be made to the internal controls. Such adjustments could damage the unit and invalidate the warranty and also cause serious interference to other users of the electromagnetic spectrum.

USA TECHNICAL REQUIREMENTS

Some versions of this transmitter do not include internal audio limiting. To maintain compliance with the FCC rules and technical requirements the audio source / feed should be level controlled to prevent over deviation and excessive use of bandwidth by means of an external audio limiter and/or processing device, MPX stereo generator and/or RDS generator. More information on this is at is in section 2.1047 Modulation characteristics and section 2.1049 Occupied bandwidth at http://www.gpo.gov/fdsys/granule/CFR-2011-title47-vol1/CFR-2011-title47-vol1-sec2-1047/content-detail.html

EU REGULATORY REQUIREMENTS

Some versions of this transmitter do not include internal audio limiting. To maintain compliance with the EU ETSI standard the audio source / feed should be level controlled to prevent over deviation and excessive use of bandwidth by means of an external audio limiter and/or processing device, MPX stereo generator and/or RDS generator. More information on this in section 8 Audio Processing Limiter at https://www.aareff.com/ETR132.pdf

This product complies with EMC directive of the European Union. To meet this directive the user or installer must follow the wiring instructions in the this user manual

This equipment is not intended for installation by an unqualified end user, the installer must have competent RF engineering skills and EMC knowledge at their disposal. The whole transmission system, including the antenna system and external audio limiting, should be installed in the EU in accordance with document ETR132, a copy of this is available at https://www.aareff.com/ETR132.pdf

LEGAL ADVICE

We sell this equipment to professionals and organizations in good faith it will be used correctly and legally. Nearly every country in the world require licensing for this type of equipment. It is the customer's responsibility to check relevant laws, directives, regulations and licensing requirements before installing or putting this product into service with an antenna system. You, the customer or user 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 equipment.

DECLARATION OF CONFORMITY

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 FM broadcasting. 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

ROHS

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)

PRODUCT END OF LIFE

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.

© 2026 AAREFF SYSTEMS LIMITED

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)