ISOFREQUENCY IN FM – The point of the situation

This subject excites the curiosity and interest of FM Broadcasting technicians and managers starting about forty years ago.
In my life, I have received more than a thousand times this simple question: “Does it work or does it not work?”
A minimally serious answer could require entire volumes and would bore or confuse everybody.

The only possibility for a simple and easy understandable answer is making a practical audio-video example, on the basis of what has been done to show the quality difference between an analog FM broadcasting in Mono and Stereo : 

Since there are a myriad of parameters that can affect the results of the reception of two FM transmitter sites under conditions of: “Isofrequency YES – Isofrequency NO”, I chose to publish the qualitative comparison in this humble report : the most simple limit case (obviously there were a myriad of others with variable parameters) that was simulated in a laboratory session from the customer (Radio Maria)with equipment produced by Elenos :

A) Monophonic emission
B) Stationary reception
C) Same signal amplitude of the two transmitters at the receiver (Protection ratio = 0dB)
D) High signal at the receiver input (-50dBm)
E) Absence of interference from other signals
C) Contemporary arrival of the signals from the two transmitters to the receiver (Same time of arrival -TOA)
D) Equal index of modulation of the transmitters (Isomodulation)
E) Frequency difference between the transmitters: 0.1 Hz (360 ° every 10 seconds)
The test: “Isofrequency YES / Isofrequency NO” was performed by disconnecting one of the two transmitters at the 22nd second of the video (a few seconds before the end).

For those who want to learn more about the topic, the official reference document is:!!PDF-E.pdf
In particular pages 17-23 .

The video confirms the ITU thesis exposed at page 21 :

It may be noted that in the most favorable case (monophonic mode, 2 µs time delay) the protection ratio is very close to 0 dB using synchronized transmitters 

and that the equipment used in the tests achieve this result.

Below is the measurement setup adopted:

The Professor

“Fantasy, courage, resourcefulness and lots of knowledge.
And this all inspired and guided me before really knowing him. Then I met him: and it was even far more! I discovered a kind and big-hearted person. With him I enjoyed talking and exploring new ideas… even bizarre ones; but certainly innovative!
Sometimes it seemed impossible to realize but instead, the road became reality… It was incredible!

To think that just a few days ago we were discussing better ways to design a new transmitter, and today I can’t believe it is not a reality anymore.
It always amazed me that each time I had a doubt, he still found an idea that shifted the paradigm!
He would look at my face, which certainly showed disbelief, and pleasantly smiled, for putting me in doubt!

It was our favorite game; trying to put the other in doubt and disbelief; but always trying to overcome the limits of practical knowledge.
And it was in this way that the Professor was most extraordinary! I will forever miss and never forget this…”


Elenos S.R.L. moves to acquire Broadcast Electronics (BE): An Inside Conversation

Interview by Jeff Wilson, Director of US Sales and Marketing, Broadcast Electronics.

On December 20, employees of BE and Elenos, our customers and broadcasters throughout the world, the city of Quincy, Illinois USA, and vendors and partners everywhere were shocked to learn that Elenos is acquiring BE. Since that announcement, there have been many emails, calls, and questions regarding this acquisition. In an attempt to try to answer some of these questions, I have had a conversation with Leonardo Busi, Elenos Group President and Tom Beck, President/CEO of BE. Here is the text of the conversation.

Wilson: A lot of people worldwide were surprised to hear that Elenos is acquiring BE. Does this reaction surprise you?

Busi: “Although this may be surprising news, the end result will be great news for all. I know all at Elenos and Itelco are very excited about it.”

Beck: “I agree. I think many would view us as enemies in the marketplace as we have both been manufacturing and both of our companies have sold thousands of transmitters throughout the world since the late 1970’s. But, I see great synergies between our companies and I think the end result, as Leonardo says, will be great news for broadcasters everywhere. We will have the ability, with our feet planted in our respective locations, to be in the best position to serve our customers now and well into the future”.

Wilson: Leonardo, why do you want to purchase Broadcast Electronics?

Busi: “I have admired BE for many years and BE has been a great company for a long time. I have known BE to have a great reputation and I know they have designed quality products and are respected by many all over the world. I am truly excited about the future for our companies.”

Beck: We have also watched Elenos through the years and we see one of the few companies that today continues to invest heavily into next generation technologies to provide the equipment that broadcasters need. These are things like energy efficiency and the total cost footprint at time of purchase and for the lifetime of the equipment. I think that our product and support philosophies will continue on our side and that jointly we will have the opportunity to ensure the best options for broadcasters everywhere.”

Busi: “Always most important is the people. I am excited about working with the people at BE. This is most important for our future success together.

Wilson: The release on December 20 spoke about television products. Can you explain how this fits into this acquisition?

Busi: “I see at BE the ability to expand into television, and we will be investing in this. For the past few years, we have revived the Itelco brand and there is an opportunity to bring our TV options in a bigger way to the US.”

Beck: “Again, I agree. We will have the ability to provide US manufacturing, customer service and support from right here in Quincy. We can provide and support a solid option for consideration for TV broadcasters in the US and all of the Americas.”

Wilson: Is there anything else that should be mentioned to broadcasters worldwide?

Beck: “Although I am very thankful for our transmission products, there is more to BE than our FM and AM transmitter product lines. We have a very large installed base of AudioVAULT customers and Marti Electronics continues to be the most trusted STL and RPU products for radio broadcasters. We will continue to focus on our loyal customers and the future of these products as well.

Busi: “Yes, yes, radio automation is not my company’s area of expertise, but I know that AudioVAULT is a very big part of the BE story and this must continue. I am excited to learn more, but I can see that AudioVAULT must continue to develop. My sales teams in Europe will be able to show my broadcasting friends how great AudioVAULT is. I see great opportunity with AudioVAULT and with Marti, too. Everyone knows the name Marti.”

Beck: “In the broadcasting market today, this should be viewed as positive and hope people will see this. This acquisition will strengthen both of our companies and I believe we can better plan for the future together. We will need to prove this and I’m confident we will.”

Established in 1959, BE is the world’s leading radio-only equipment manufacturer and currently provides award winning FM and AM transmitters, AudioVAULT studio automation, Marti Electronics STL and RPU solutions, and Commotion™, a social media, advertising, and listener interactive solutions company.

Established in 1977, Elenos has been a world-leader in the design of FM transmitters with a focus on compact design, reliability, and quality. Elenos transmitters provide best of class energy efficiency with over 40,000 transmitters installed in over 100 countries.

Established in 1962, Itelco has been providing state-of-the art TV Transmitters in IOT technology and solid-state technology with both liquid and air-cooled options. Itelco also specializes in providing turn-key solutions for scientific, military, aerospace, and medical applications.

Elenos acquires Broadcast Electronics

Elenos, a global manufacturer of FM transmitters, has acquired Broadcast Electronics (BE).

Broadcast Electronics has been a trusted provider of FM and AM transmitters for more than 50 years. Founded in 1959, BE began manufacturing transmitters in 1977, and is now the largest manufacturer of radio equipment in the United States.

Elenos manufactures FM transmitters that have become widely recognized for their compact design, reliability, and sound quality. Elenos’ technology for reducing energy consumption has become an industry standard, and has been adopted widely by other manufacturers.

This acquisition stands to provide both companies with an increased global presence, and furthers Elenos’ mission to build high quality, reliable transmitters. The transaction also provides Broadcast Engineering with access to Itelco analog and digital TV transmitter technology (acquired by Elenos in 2015).


Elenos proposes a new concept in the N+1 changeover systems scenery, based on the success of the compact transmitters of the series ETG2000 and ETG3500.

The innovation consists in a 6 transmitters (maximum) system +1 backup 2kW or 3.5kW transmitter, together with a changeover relay, an audio changeover matrix and a 3.5kW dummy load, all contained within a 40U rack.

The advantages of a similar, innovative configuration are many:

  • Extreme compactness, so extreme ease of installation, without particular predispositions in the station. The system, entirely contained in a 40U rack, is considered ready to be programmed and put into operation.
  • 7 transmitters all equal (6 + 1), for an easy system conduction thanks to the staff training that will have to learn the workflow of just one kind of transmitters.
  • “Closed” system by the interferences side and station issues, with “ad hoc” precautions for the best functioning and reliability while working.
  • CE marked system in its entirety, for avoiding issues of maintenance of compliance requirements to 1999/5 that would unavoidably arise in every case of connection of different brands equipments.

The changeover system allows an immediate understanding of the status, thanks to the easy and intuitive synoptic panel, which represents in a clear way the changeover status of every relay. The transmitter receives, from the changeover act in antenna, the “profile” of the faulty transmitter: RF power, audio levels (MPX, L, R) and of the subcarriers in order to perfectly replicate it without characteristics loss.

NAB 2016 exhibition is coming!

Itelco and Elenos along with 305 Broadcast will be attending at booth N1530.

Our team will be proud to introduce the latest exciting innovations upgraded in Itelco and Elenos equipment lines.

Itelco TV Products on Display at NAB 2016 (

  • LOW POWER: Alpan UHF Compact Transmitter Line. At the heart of the line is the MEXII multimode exciter combined with the Thalna air-cooled amplification module. The integration of these technologies allows for maximum compactness, modularity and redundancy.
  • MEDIUM POWER: the Thalna Air-Cooled TX Line delivers up to 2.4 kWrms in DVB-T/H in a single 19-inch rack.
  • HIGH POWER: Northia Liquid-Cooled TX Line. Up to 10 kWrms in DVB-T/H in a single 19-inch rack.

The Itelco-Electrosys’ optimized manufacturing process means that users benefit from operating cost reduction, ease of maintenance and the effortless management of spare parts.

Elenos RADIO Products on Display at NAB 2016 (

  • NEW*** 5kW Digital ETG Indium, 4Unit, Ultra-Compact FM Transmitter: high audio quality, advanced signal-to-noise-ratio, very low total harmonic distortion, SFN operation, energy-saving unit, total remote control via SNMP… come to discover other great features!!
  • E10000 FM Amplifier: efficiency of up to 70 percent, 10 kW FM amplifier in a 4-unit rack.
  • Avatar Network Manager: the big brother of your radio network! Avatar is the most innovative, powerful and valuable remote control system available on the market. It offers users a complete system composed of a main data energy management module, maintenance module, quality and measurement module and network management module.

Join us at booth N1530 for a drink and a friendly chat with our team. It is the perfect opportunity to get to know each other better and learn more about what we have to offer you. Book your personal meeting in advance using the direct email

Itelco & Elenos: 100 years of experience at your service to face market evolutions. We can provide the state of the art of turn-key projects tailored according to specific requirements. “Working with you to face future challenges“: this is our goal… this is our mission!

Nowadays, reaching 72% efficiency with an FM transmitter is no longer a mirage

No, we are not talking about transmitter energy efficiency measured on the amplifiers’ internal RF! This absolutely not: by doing so, we might easily boast an 84% efficiency but this would not reflect the truth.

No, we are talking about a practical measurement carried out starting from the mains contacts being this the sole measurement allowing to monitor the real consumption of an FM transmitter.

Today, by the tests performed on the mains distribution, an Elenos 5kW FM transmitter is delivered to customers with an average of 71% up to 74% certified efficiency in the FM band.
As an example: by operating 20 Elenos 5kW FM transmitters, with a kWh cost of 0,20$, the annual electricity bill would amount to $245.280 instead of $318,545 which is the average to be paid by operating transmitters of other brands.  Therefore, obtaining a 23% saving, less $73,265 per yearly operation!

This is the outcome of Elenos R&D who endeavored to improve efficiency of the RF section and of the power supplies, for the last 15 years.  Also minimizing the losses on the combining stages, Elenos achieved delivery to customers not only of reliable and enduring equipment but it also achieved the apex in terms of efficiency still to be equaled by others.

The actual Elenos presence on African market is being enhanced by new Centers of Excellence: the companies Headway (Khartoum, Sudan) and Clyde (Abuja, Nigeria). These two new centers join Broadcast Solutions International, company being already Center of Excellence since several years in Nairobi, Kenya.

Happy Digital Holidays


We wish you happy holidays with Elenos.

Our focus for 2016 is to keep on providing you with top radio technologies with:

  • Quality broadcasting solutions
  • Remote control and monitoring
  • Top support service


Contact us if you need any informations about our FM and TV broadcasting systems or if you are interested to work with us in the radio and tv broadcasting market. Happy 2016!

Sitemaster, Portugal

Acabamos de instalar a centésima unidade dos emissores ELENOS, serie INDIUM de 10Kw.
Os emissores ELENOS já estão presentes em mais de 50% das estações de rádio em PORTUGAL.
Obrigado á Sitemaster pela suporte e empenho na crescimento da ELENOS no mercado português e PALOP’s.

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