Monday, 21 June 2021



Here is a compendium of several of the live DRM complexes operating in the FM band today world over and a summary of the most important DRM live transmission trials in the FM band. The results are a testimony of the performance of the DRM standard specifically in the FM. Several countries across the globe have embraced DRM — owing to its performance, power and spectrum efficiency, advanced features, openness (i.e., not depending on or controlled by a single company) and flexibility — as the choice of digital radio technology for their nationwide FM digitization.

DRM is the high-quality and feature-enhanced digital replacement for the former analogue radio broadcasting standards AM and FM; as such it can be operated with the same channeling and spectrum allocations as currently employed. DRM has received the necessary recommendations from the ITU, hence provides the international regulatory support for transmissions.

Wednesday, 16 June 2021

Is the Car Dashboard Radio’s Next Battlefield?

This often-rehearsed question resurfaces periodically, as radio is facing an uphill struggle against the digital giants ready to grab the dashboard. Hybrid radio is presented as a survival solution on the move, as cars remain a key driver of audio listening.

The term, meaning many things to many people, is very fashionable just now, a bit like “digital,” “convergence” and the “multimedia” mantras of some years back.

Hybrid radio is a mixture of analog radio and digital broadcast sources, like streaming, or a mash between digital radio (mainly of the local variety) and IP-served radio services.

The current orthodoxy goes that, unless good old-fashioned radio or audio also gets all the “bells and whistles” offered by known digital companies and mimics the commercial streaming services provided by the Googles of this world, radio is doomed and will be eliminated from the automotive infotainment landscape.

[Read: Hybrid Described as Radio’s Best Chance]

In the U.S. car listening remains king and accounts for more than 50% of all radio listening. According to the recently unveiled annual 2021 Techsurvey Jacobs Media and Veritone, 58% of the 40,000 U.S. respondents listen to AM/FM radio in the car, 18% to satellite radio while personal music rates some 3%. Smartphones only come in second, after cars.

But more interesting are the ranked reasons for radio’s enduring attraction: easy to listen to, familiar hosts, available for free (i.e. no money), while almost half the listeners agreed that being local is radio’s primary advantage.

Hybrid radio definitely addresses the challenge of “easy to listen to”: press a button or voice-activate your car radio and you are in business. If you leave the coverage area, an IP stream will ensure you can continue to listen to your favorite station or presenter, provided the station stream can be accessed and coordinated with the over-the-air broadcast service.

Hybrid can also paper-over the transmission gaps if your car is fitted with an analog or digital local coverage standard which is sometimes unavailable in the targeted coverage area.

And there are other positive considerations, too. Linking terrestrial broadcasting with IP ensures continuity and enhanced service, personalized and visually rich. This is all enabled by the metadata (song title, branding labels, ads, etc.) that accompany the audio on the mobile broadband connection. Above all, hybrid offers the attractive possibility of a back channel. If the hybrid receiver had, or will have in the future, an extra button for notifications: information, ads, tickets etc., these could be sent directly to your phone or email.

The two-way connectivity is the one thing radio has not been able to offer easily until now. The other is offering reliable data about who is listening to what and for how long. This is less of interest to listeners and more to advertisers and broadcasters. It is also the most valuable and remunerative information hybrid radio could provide.

[Read: Audi AG Launches Hybrid Radio in U.S. and Canada]

The proponents of hybrid radio stress that all these attributes, plus the podcasting possibility, are essential for radio’s survival and relevance on the new and flashy dashboards securing its place in the unequal battle with the apps, satellite and Big Tech services.

There are though some big caveats and questions on hybrid radio:

Are stations prepared to foot the bill for the streaming fees linked to the smooth transitioning from terrestrial to IP, not to mention the possible copyright fees incurred while the streaming runs in the background ready to pounce only when terrestrial fails?

Are broadcasters ready to share the streaming URLs and metadata and to make them available to open platforms or commercial entities, be they big patent companies or even car manufacturers?

Is the provision of podcasting essential, considering that in the latest Techsurvey, 6 out of 10 U.S. radio listeners are not bothered by this hot product still not flying after 15 years, not to mention that podcasting does not enhance radio listening but possibly diminishes the radio listening time.

If hybrid radio is the way forward, is this a U.S. and developed world project and commercial venture? According to the information released on the United Nations World Telecommunication and Information Society Day (May 17) 3.7 billion people, almost half the world population, remain unconnected to the internet.

From my own DRM perspective, the simpler question is: why hook up with IP, using extra effort and costs, analog and digital radio, when at least one digital radio standard, DRM, fulfills and satisfies already many of the aspirations of hybrid? DRM already includes SPI and what RadioDNS offers. It can connect broadcast and online, benefits from Journaline to ensure rich services, interactivity and personalized content.

A DRM receiver, in car, on a cell or in the kitchen can carry useful information: logos, maps, pictures, weather, traffic, disaster alerts and education material, addresses and ads.

DRM broadcasters can transmit on any analog frequency (AM or FM) up to three audio channels and one data channel, saving both energy, spectrum and money. One or two , or all three audio channels can be flexibly reassigned to data, so that less audio and more data is presented to users by easily programming the “four digital lanes” of DRM on one 96 kHz (FM) frequency or on an existing AM frequency. RSS feeds can be presented on DRM receivers without the need to publish and give somebody else your streaming URL and metadata information.

Does this mean that the big hybrid radio push will suddenly stop? Of course not, radio needs modern digital clothes, future proofing but also a reality check. Why reinvent the wheel when digital radio, DRM, has everything to benefit listeners and broadcasters?

If a camel is a horse designed by a committee, then hybrid is still a cute camel, not a horse yet.


Monday, 7 June 2021


In its 100th anniversary year the DRM Consortium salutes radio as the mass digital communication platform for our challenging times. To celebrate the unique and relevant place of radio in people’s lives and the progress made by Digital Radio Mondiale in this unprecedented year, we have created our first ever DRM e-book. Its aim is to give you a succinct overview of the best DRM events, activities and successes in 2020, while offering you a varied and wide digest of information, opinions and updates on DRM and digital radio.

In 2020 the value of the only global, open, all band digital audio broadcasting system, DRM, was conveyed to more people, further afield, than ever before. Old and new stakeholders and enthusiasts were the audience in the 2020 virtual conference rooms where a “show and tell” approach demonstrated DRM’s services and advantages in both AM and FM bands.

We introduced new technical development of the extra-efficient use of DRM FM and devoted a lot of attention to DRM’s capabilities to deliver multimedia and, therefore, textual information needed not only Emergency Warning Functionality (EWF) but also to facilitate distance learning. This is an area we aim to develop in 2021.

Manufacturers from China, India, Germany, South Korea, and U.K showcased dozens of receivers for AM (medium wave) but also for digital FM and in 2021. As manufacturers will receive increased orders, we expect them to bring larger volumes of affordable receivers to the market, as more countries adopt DRM.

Ruxandra Obreja, DRM Chairman, stated that “the new DRM e-book gives a complete, up-to-the minute valuable information on DRM. The DRM e-book demonstrates that this all band-standard has registered significant progress in 2020 and is poised for even bigger successes in 2021, when millions of new and old listeners will discover and rediscover the wonder of radio, of digital radio DRM.”

Download – E-book:

For PDF:

Friday, 29 January 2021


Indicative locations of MW DRM transmitters in India shown in map

In the list, the DRM frequency and the AM carrier is 9 kHz lower. Programme content of AM and one of the channels of DRM is the same.

Vividh Bharati Service is also known as VBS. Regional programme variants are indicated by city name after the network title.

Note : Operates in Pure DRM mode 1530-1630 hrs. (India Standard Time) every day except Sunday

Broadcasts will have local coverage during daylight hours but generally cover long distances during darkness.

for more details:


Monday, 11 January 2021

RTL-SDR Blog R820T2 RTL2832U 1PPM TCXO SMA Software Defined Radio with 2x Telescopic Antennas



Digital Radio Monodial (DRM) radio is a type of digital shortwave radio signal that is used by international shortwave radio broadcasters. It provides superior audio quality compared to AM signals by using digital audio encoding. With an upconverter, good antenna, and decoding software the RTL-SDR software defined radio can receive and decode DRM signals. This tutorial is also applicable to other software defined radios that can receive HF with or without an upconverter, such as the HackRF, Airspy, Softrock and Funcube dongle.

Examples of DRM Decoding
YouTube user Superphish shows DRM reception with his Ham-it-up upconverter, and rtl-sdr.

Tutorial: How to Receive and Decode DRM Signals
To receive DRM with RTL-SDR, you will need the following:

An RTL-SDR dongle working with SDR#. (Or a more advanced SDR such an Airspy)
An HF upconverter such as the recommended SpyVerter or ham-it-up, or a dongle modded for direct sampling (such as our already modded V3 dongle), or SDR# modded to use the experimental Oliver Jowett HF driver for regular RTL-SDR dongles.
The DREAM DRM decoding software with AAC decoder.
Virtual Audio Cable or VB-Cable.
A DRM signal looks like this (left) on the waterfall, placed next to a normal shortwave AM signal (right).

We will assume that you already have an HF capable SDR, such as the RTL-SDR V3 or an HF upconverter, and have set it up with SDR#. We also assume you already have an audio piping utility such as Virtual Audio Cable or VB-Cable set up on your system which allows the audio to be passed from SDRSharp to the decoding software. If you don't have and not set these up, check out the Buy RTL-SDR and Quickstart pages, and head to the virtual audio cable download page (trial), or the VB-Cable download page (free).

The sampling rate of your audio piping method must be set to 48000 samples/sec. To set this in Windows, right click your device in the Windows sound recording tab, go to properties and under the advanced tab, set the sample rate to 48000 Hz. Do the same to the same device under the Playback tab as well.
Sound Properties
Now, head to the DREAM download page, download DREAM and extract the zip file into a folder. DREAM is a free opensource DRM decoder.
Due to software licence reasons the required audio decoder can not be shipped with the DREAM binary file. You can follow the instructions on the download page to compile your own faad2_drm.dll decoder, but as not everyone has compilation experience, a precompiled faad2_drm.dll download for windows can be found at this megaupload link. Note that using this file in some countries may not be legal due to patent laws. Place the faad2_drm.dll file into your DREAM folder.
Now you can open SDRSharp, set virtual audio cable as the output audio device, and then tune to a DRM signal. DRM signals use upper side band (USB), and have a bandwidth of 10 kHz, so apply these settings to SDRSharp as well.
Carefully align the left red line with the start of the signal. AGC can be left on, but it may need to be experimented with in order to get the best decoding performance.
Now, open DREAM and then go to Settings -> Sound Card -> Signal Input -> Device and set Virtual Audio Cable or VB-Cable as the input device. Also, ensure that Settings -> Sound Card -> Signal Input -> Sample Rate is set to 48000 Hz.

Try to get the green "Level [dB]" bar in DREAM to be near the center by adjusting the volume settings in SDRSharp. If everything is set up correctly, you should see three green bars underneath the volume meter and start seeing information about the DRM radio station you are tuned to in the window, and also begin to hear some audio.

Some Tips:
To receive DRM signals you will need a good HF antenna, placed up high. A simple long wire strung across your attic may work well. Look up "random wire antenna". Also a magnetic loop antenna may be a good choice.
RTL-SDR tends to place imaged broadcast AM signals into some DRM signals. This can cause decoding to completely fail. We suggest trying a HF filter that blocks the AM broadcast band.
If you hear no audio when decoding, check that you have placed faad2_drm.dll into the DREAM folder correctly.
DRM is a digital signal, so it will either work and play audio or it will not work at all. Poor reception may cause the audio to constantly drop out.

Friday, 8 January 2021

Digital channels of Prasar Bharati see over 100% growth


Digital channels of state broadcaster Prasar Bharati across Doordarshan and Akashvani have registered more than 100% growth in 2020, clocking over a billion digital views and over six billion digital watch minutes, the government said in a statement on Sunday.

During the year, NewsOnAir App added more than 2.5 million users with the platform registering over 300 million views. Live radio streaming, with over 200 streams, emerged as the most popular feature.

Underscoring the substantial digital audience for news from the region, the north east service of All India Radio News is also in the top 10, and has crossed the 100,000 subscribers online.

The Mann Ki Baat YouTube channel and Twitter handle have seen rapid growth in 2020, the government said with the latter having more than 67,000 followers and the former including regional language versions of different episodes featuring the PM’s address. Around 1,500 radio plays in different Indian languages are available across the DD-AIR network which are now being digitised and uploaded on its YouTube channels. Several hours of educational content and teleclasses are now available on the broadcaster’s YouTube channels in different Indian languages.

Friday, 1 January 2021

A new generation AM - Digital (DRM) - FM receiver GR-216



A new generation AM - Digital (DRM) - FM receiver
GR-216 Technical data

With special features:

1. Record The B'cast. It is possible to record and play back audio files to and from a USB memory stick. The function works for all modes (AM, FM and DRM) and will be stored on the USB stick under a directory named "grrec".

2.With the release of the v460 firmware it is possible to create DRM logs which can be plotted with the latest version of the DRM Log-Plotter.

GR-216 Technical data at a Glance
Frequency range, FM: 87.5 - 108.0 MHz
Frequency range, AM: 531 - 1620 kHz (522 - 1710 kHz with v421M)
Frequency range, SW: 2.3 - 26.1 MHz
Tuning step 50 kHz or 100 kHz
MW: 1 kHz or 9 (10) kHz
SW: 1 kHz or 5 kHz
Antenna FM & SW: Telescopic antenna
MW: Ferrite antenna
Active antennas on MW and SW
External Antenna sockets FM: BNC
Internal / External antenna switch.
Station memory slots: 60
DRM memory slots (VM): 200
Tuning system: Manual (rotary knob)
Auto-scan (Up / Down)
Preset buttons (VF)
DRM Memories (VM)
Tone controls Bass
Stereo reception: Headphones or Line Out connectors
Clock: 24 Hour clock, dual Alarm clock (radio or buzzer)
Sleep timer.
Display: Multi-function LCD.
Power supply, internal: 230V / 50 Hz AC
Power consumption Normal use: 13 Watt
Stand-by: 7 Watt
Power supply, external: 9 V DC
Power consumption Normal use: 5.6 Watt
Stand-by: 0.7 Watt
Loudspeaker 77 mm Ø
AF output power: 4 W
Measurements (without knobs): 240 mm (w)x 120 mm (h) x 150 mm (d)
Weight (total): 2155 g
Weight (230 V power supply): 705 g
Supplied accessories: 230 VAC power cord
230 VAC / 9 VDC power supply
User's manual

For more details:

Thursday, 24 December 2020

#DRMdigitalRadio Awareness Campaign in #Vizag #Hyundailndia on 21-12-2020 #AIRvsp

Digital Radio has capability to provide multiple services on single frequency.   Now, we can select the available services which want to enjoy.Video shows how to tune digial radio in car.


Wednesday, 23 December 2020

A very simple video explaining about "What is DRM"

Here is simple video explaining about "What is DIGITAL RADIO MONDIALE?"

DRM is the universal, openly standardised digital broadcasting system for all broadcasting frequencies, including the AM bands (LW, MW, SW) DRM ensures the efficient and complete digitisation of those countries committing to the digital radio roll-out. The great flexibility of DRM supports all types of coverage needs – from local, regional, nation-wide to international. DRM allows a seamless transition to digital radio with the upgrade of existing transmitter infrastructure as well as with analogue-digital simulcast configurations. DRM digital radio can save broadcasters up to 80% in energy and maintenance costs.
for watching Video click the link :

Wednesday, 16 December 2020


All India Radio updated the 2nd NXP Car Forum (on November 25th) by giving details about new transmitters, extended pure DRM transmissions, extra content and improved communication.

All India Radio is fully committed to DRM Digital Radio for all of India. AIR urged the Automotive Industry to make DRM available in all car models support and help promote the DRM migration while supporting all supporting all DRM features and bands and to start promoting DRM to customers in cooperation with AIR. “Together let’s convince the government to mandate DRM in cars”.  More here

Source :-