If you want that FM exciter that rivals and sounds even better than the biggest commercial stations, the Veronica PLL has to be your first choice. High precision frequency control using DDS with a slow speed PLL ensures the highest quality audio and MPX.

DDS Referenced PLL

Direct Digital Synthesis (DDS) provides precision frequency and agility, but one of the negative aspects of DDS that the other manufacturers don't talk about, is that it generates a lot of spurs and noise at higher frequencies as the sample rate approaches the Nyquist limit. At lower frequencies where the sample is multiple times that of the generated frequency the DDS gives an amazing clean and accurate output. We take this clean lower frequency DDS output and multiply it up to VHF using a traditional low noise PLL (better than 80dBu). This results in a clean and pure VHF Voltage Controlled Oscillator (VCO) output with the the frequency agility and precision of DDS. We achieve the best of both worlds.

Low Noise! Better Than -80dBFS

The combined use of DDS and PLL results in an unweighted noise level better than -80dBFS. When factoring in the de-emphasis weighting, the noise performance surpasses that of a 16-bit system, such as CD audio, exceeding 90dBFS. The VCO incorporates three varicaps: one for broadband tuning (84 to 112 MHz), another for PLL correction voltage, and a dedicated varicap for FM modulation. The modulation varicap is precisely biased at the optimal voltage to ensure maximum audio linearity, achieving better than 60dB/0.1% IMD across the 30 to 76 kHz range.

Flat 30Hz to 76KHz MPX Input

Because this VCO is so inherently steady, the PLL only has to make minor corrections to maintain the frequency within about 300 Hz, effectively just giving it a slight nudge. Consequently, the audio remains very clean, as noted previously, and the PLL’s control voltage can be heavily low-pass filtered to just a few hertz. Such a slow loop filter ensures that low frequencies around 30 Hz are not misread as frequency drift, passing unaltered to the varicap. This preserves the essential low-end audio response needed for high-performance audio processors.

When installed within a transmitter enclosure that has been EMC screened according to best engineering practices, this module will not only meet but surpass the technical requirements set by EU CE and FCC standards. For more details, please visit our Compliance with Regulatory Standards page.

High VSWR Protected

The RF output transistor in the 1 W unit is an SD1127 rated at 4 watts, in this unit it only runs at 1 watt. Given that it is four times overrated in power it can handle 100% reflection at any phase angle without burning out and still be within it's safe working limits. Basically the output stage will not break which is a requirement for CE marking.

Built-In 50 Ohm Dummy Load

This board can be powered and used on delivery, it is plug and play. The built in dummy load absorbs the 100mW or 1 watt power and converts 99% of it it heat. The remaining 1% of power is residual radiation from the board and components and can be heard on a radio receiver usually up to 10 ft/3mt away. This can be useful for checking that the board is working before installing it in an enclosure

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INTENDED USE / LEGAL ADVICE

This product is not intended for use on a 'stand alone' basis, it is sold as spare part/module sub assembly and is intended as a component for use in a fully assembled transmitter and/or transmission system that as a whole complies with the engineering requirements of ETS 300 384 and ETS 300 447. Use of this product on a 'stand alone' basis will in most countries of the world contravene the EMC compatibility regulations. It is the customer's responsibility to check relevant laws, directives and regulations 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.

CIRCUIT TESTING

1. Plug in a 50 ohm dummy load to the RF output OR Reduce the power to zero by turning VR2 fully clockwise.

DO NOT EXCEED 16V DC
DO NOT CONNECT + and - THE WRONG WAY

2. Apply between 12 and 16 volts to the PCB position marked CON6 +15V (+) and 0V (-)

3. Press the UP and DOWN buttons to select the frequency you require.

6. Apply audio at line level to CON1. Adjust the VR1 for correct FM deviation.

7. Remove the 50 ohm dummy load from the output OR Increase the power to full by turning VR2 fully. You are now ready to install the 1W PLL into your transmission system.

If the 1 watt PLL is connected to a Veronica / Aareff Limiter Compressor or a Stereo Coder, pre-emphasis is not required. To disable the pre-emphasis, do not select 50uS or 75uS and remove the jumper completely. Store the jumper in a safe place just in case you need to restore the pre-emph for another application at a later date.

USB PC 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

Shown below are the current commands available for USB PC Control and also the PTY codes for program type. We will be making further developments, improvements and more useful commands to this app in the near future. Keep checking this page for details.

PTY Code	Europe	United States
0	None	None
1	News	News
2	Current affairs	Information
3	Information	Sport
4	Sport	Talk
5	Education	Rock
6	Drama	Classic Rock
7	Culture	Adult Hits
8	Science	Soft Rock
9	Variable	Top 40
10	Popular Music (Pop)	Country Music
11	Rock Music	Oldies Music
12	Easy Listening	Soft Music
13	Light Classical	Nostalgia
14	Serious Classical	Jazz
15	Other Music	Classical
16	Weather	Rhythm & Blues Music
17	Finance	Soft Rhythm & Blues Music
18	Children’s Programs	Language
19	Social Affairs	Religious Music
20	Religion	Religious Talk
21	Phone-in Talk	Personality
22	Travel	Public
23	Leisure	College
24	Jazz Music	Not assigned
25	Country Music	Not assigned
26	National Music	Not assigned
27	Oldies Music	Not assigned
28	Folk Music	Not assigned
29	Documentary	Weather
30	Alarm Test	Emergency Test
31	Alarm	Emergency

SPECIFICATIONS

The following tests were taken at 15V DC and the worst case measurement was recorded over the range -20 to +50 deg C.

Frequency	87.5 - 108 MHz
RF Output	1W to 1.4W into 50 Ohm
Deviation Sensitivity Stability	+/-2% max
Spurious Emissions	75dB rtc
Harmonic Emissions	63dB rtc
Out of Lock RF Muting	63dB rtc
Freq Stability	+/- 1 KHz max typ. +/-300Hz
RF Output Connector	Female N type
Audio Input Sensitivity	0dBu for +/- 75 KHz
Signal To Noise Ratio	80 dBu
Audio Response	Flat from 30Hz-76KHz
Pre-emphasis	(50uS/ 75uS/ None)
Audio Distortion	Better than 0.1% / 60dB THD
Audio Input	Unbalanced Terminal Block
Power Supply	12-15V DC 650mA max

PCB LAYOUT (PARTS LIST)

DECLARATION OF CONFORMITY

In Zurgena, Almería, Spain on 01 of November 2011, the equipment:

Original and Genuine Veronica 1W PLL (1WPLLM) meets the essential requirements of the R&TTE directive

ETS 300 384/A1 ed.1 (1997-2002) Broadcasting Systems Transmitters FM sound broadcasting in very high frequency (VHF)

It should be noted that this cannot be legally used as a standalone unit. This sub assembly is designed and intended to be installed in a fully screened EMC enclosure with or without other sub assemblies. Any final design should be further tested to verify it meets the essential requirements of:

EN 301 489-11 V1.3.1 (2006-05) Electromagnetic compatibility and Radio Spectrum Matters (EMC) for radio equipment and services. Part 11: Specific conditions for transmitting the terrestrial sound broadcasting service.

2006/95/EC DIRECTIVE 2006/95/EC of 12 December 2006 on electrical equipment designed for use within certain voltage limits.

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.

© 2023 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)