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Oleg V. Varlamov, MTUCI, Moscow, Russia, vov@mtuci.ru

The Digital Radio Mondiale (DRM) digital broadcasting standard is the only one approved by ITU for worldwide use in the frequency range below 30 MHz. The DRM digital broadcasting system allows the most economical servicing of sparsely populated and remote regions with no telecommunications infrastructure. The DRM standard provides for the possibility of using single-frequency synchronous radio networks. Their use with correct frequency-territorial planning allows to increase the efficiency of DRM broadcasting, and provides economy of frequency resource. The construction of single-frequency DRM synchronous networks in general differs from the scheme of DVB-T/DVB-T2 synchronous digital television networks or DAB/DAB + VHF digital broadcasting networks due to the presence of ionospheric propagation of radio waves. In this article, these features are considered and a technique for calculating the synchronism zone is proposed. Consideration of possible scenarios for the placement of transmitters showed that the most advantageous can be considered their location at an angle of 90 degrees to each other. The first zone of synchronous DRM broadcasting, created in Russia in the HF band, is described for the first time, providing a round-the-clock reception capability with broadcast quality over a large area. The results of the measurements showed that the network gain reached 6 dB when receiving on a wire antenna and up to 11 dB on a whip antenna. When using for broadcasting «daytime» and «night» frequencies, high-quality broadcasting with high reliability (98% of audio decoding) can be provided for 24 hours a day.

Keywords: Digital Radio Mondiale (DRM), single frequency network; synchronous broadcasting, synchronism zone calculating, SW range, test trials, measurement results.


1. ETSI ES 201 980 V4.1.1 (2014-01) Digital Radio Mondiale (DRM); System Specification.
2. Varlamov O.V. (2017). Tekhnologiya sozdaniya seti cifrovogo radioveshchaniya standarta DRM dlya Rossijskoj Federacii. Dis. Dokt. Tehn. Nauk [The technology of creating a digital broadcasting network of the DRM standard for the Russian Federation. D.Sc. Thesis]. MTUCI. Moscow. (In Russian)
3. Varlamov O.V., Varlamov V.O. (2018). Opredelenie zony obsluzhivaniya peredatchika cifrovogo radioveshchaniya standarta DRM s uchetom raspredeleniya atmosfernyh radioshumov. Tekhnologii informacionnogo obshchestva. Materialy XII Mezhdunarodnoj otraslevoj nauchno-tekhnicheskoj konferencii [Definition of DRM digital broadcasting transmitter service area, taking into account the distribution of atmospheric radio noise. Proceedings of the XII-th International branch scientific and technical conference «Information society technologies»]. Moscow. MTUCI, pp. 136-137. (In Russian)
4. Varlamov O.V., Varlamov V.O. (2017). Distribution of maximum levels of atmospheric radio noise in LF and MF ranges in the territory of the Earth. H&ES Research, vol. 9, no. 5, pp. 42-51. (In Russian)
5. Varlamov O.V., Varlamov V.O. (2018). Programma rascheta raspredeleniya maksimal’nyh urovnej atmosfernyh radioshumov v diapazonah nizkih i srednih chastot po territorii Zemli. Svidetel’stvo ob ofitsial’noi registratsii programm dlya EVM [The program for calculating the distribution of the maximum levels of atmospheric radio noise in the low and medium frequency bands across the Earth. The Certificate on Official Registration of the Computer Program]. No. 2018618338. 2018.
6. Varlamov O.V. (2014). Korrektnoe planirovanie setej DRM veshhanija [Correctly planning of DRM broadcasting networks] Jelektrosvjaz’. No. 6, ðp. 26-34. (In Russian)
7. Varlamov O.V. (2014). Ob organizacii obshhegosudarstvennoj seti cifrovogo radioveshhanija v diapazone DV. REDS: Telekommunikacionnye ustrojstva i sistemy [On the organization of a nationwide digital broadcasting network in the LW range. REDS: Telecommunication devices and systems]. Vol. 4. No. 1, ðp. 16-19. (In Russian)
8. Varlamov O., Lavrushenkov V., Kozyrevskij B., Kaljuga V. (2006). Utochnenie otdel’nyh velichin zashhitnyh otnoshenij dlja cifrovogo radioveshhanija standartu DRM. Rezul’taty laboratornyh i jefirnyh izmerenij. Broadcasting. Televidenie i radioveshhanie [Refinement of individual values of protection ratios for digital broadcasting to the DRM standard. Results of laboratory and field measurements]. Broadcasting. Television and radio broadcasting. No. 5, ðp. 56-59. (In Russian)
9. Varlamov O.V. (2014). Kachestvennye harakteristiki zvukovogo trakta v sisteme DRM. [Qualitative characteristics of the sound path in the system DRM. Vek kachestva. No. 1, ðp. 48-52. (In Russian)
10. Varlamov O.V., Lavrushenkov V.G. Kriterii kachestva peredajushhego ustrojstva dlja standarta DRM i izmeritel’noe oborudovanie. Broadcasting. Televidenie i radioveshhanie. [The quality criteria for the DRM standard transmitting device and the measuring equipment]. Broadcasting. Television and radio broadcasting. 2004. No. 3. Pp. 44-48. (In Russian)
11. Varlamov O.V., Gromorushkin V.N., Kozyrev V.B., Melan’in A.V. (1989). Addition of the power outputs from push-pull voltage-switching oscillators having a resistive load. Radioelectronics and Communications Systems (English translation of Izvestiya Vysshikh Uchebnykh Zavedenii Radioelektronika), vol. 32, no. 7, pp. 30.
12. Varlamov O.V., Goncharov I.A., Lavrushenkov V.G. (1989). High-power HF digital-analog converter for SSB signal power amplifiers. Telecommunications and Radio Engineering (English translation of Elektrosvyaz and Radiotekhnika), vol. 44, no. 8, pp. 49.
13. Varlamov O.V., Chugunov I.V. (2017). Modeling of efficiency UHF class-D power amplifier with bandpass sigma-delta modulation. 2017 Systems of Signal Synchronization Generating and Processing in Telecommunications SINKHROINFO, pp. 7997508.
14. Filimonov N., Varlamov O., Itkin G. (2003). Efficient modulation of RF signals. EP1450479 (B1) 20.02.2003.
15. Ivanjushkin R.Ju., Varlamov O.V., Sjagaev A.K. (2007). Nelinejnye iskazhenija signala standarta DRM v sinteticheskih shemah linejnogo usilenija. Obrabotka signalov v sistemah nazemnoj radiosvjazi i opoveshhenija. Sbornik materialov XV mezhregional’noj nauchno-tehnicheskoj konferencii [Non-linear distortion in the DRM standard synthetic linear amplification circuits. Proceedings of the XV-th International scientific­technical conference «Processing signals terrestrial radio systems and alarm systems»]. Moscow: NTORES, pp. 301-310. (In Russian)
16. Varlamov O., Chugunov I. (2015). Modeling of efficiency OFDM uhf digital power amplifier with delta-sigma modulator. H&ES Research, vol.7, no.2, pð. 30-33, 2015. (In Russian)
17. Varlamov O.V., Stroganova E.P. (2018). Frequency extension circuit for EER transmitters operating with electrically short antennas. 2018 Systems of Signals Generating and Processing in the Field of on Board Communications, IEEE, pp. 8350577.
18. Varlamov O.V., CHugunov I.V. (2015). Raschet chastotno-rasshiritel’noj cepi dlya DRM peredatchikov diapazonov DV i SV. Svidetel’stvo ob ofitsial’noi registratsii programm dlya EVM [Calculation of frequency expansion circuit for DRM transmitters LW and MW ranges. The Certificate on Official Registration of the Computer Program]. No. 2016611512.
19. Digital Radio Mondiale (DRM); Minimum Receiver Requirements. Version 1.0. http://www.drm.org/wp-content/uploads/2012/10/DRM_Minimum_Requirements1.pdf.
20. ETSI EN 302 245-1 V1.1.1 (2005-01) Electromagnetic compatibility and Radio spectrum Matters (ERM); Transmitting equipment for the Digital Radio Mondiale (DRM) broadcasting service; Part 1: Technical characteristics and test methods.
21. ETSI EN 302 245-2 V1.1.1 (2005-01) Electromagnetic compatibility and Radio spectrum Matters (ERM); Transmitting equipment for the Digital Radio Mondiale (DRM) broadcasting service; Part 2: Harmonized EN under article 3.2 of the R&TTE Directive.
22. Huber J. DRM on MF and LF coverage and technical requirements. EBU-DRM Conference. Geneva, 26 Nov 2009.
23. Two transmitters, one frequency, better reception, http://www.dw.com/en/two-transmitters-one-frequency-better-reception/a-1689149
24. Otchet po NIR «Sozdanie opytnoj zony i razrabotka rekomendacij po organizacii sistem DRM radioveshchaniya v polose chastot 25.67 — 26.10 MHz» [Scientific and technical report «Creation of a pilot zone and development of recommendations for the organization of DRM broadcasting systems in the frequency band 25.67 — 26.10 MHz»]. Moscow. MTUCI. 2012. (In Russian)
25. Report ITU-R BS.2144 (05/2009) Planning parameters and coverage for Digital Radio Mondiale (DRM) broadcasting at frequencies below 30 MHz.
26. Report ITU-R BS.2384-0 (07/2015) Implementation considerations for the introduction and transition to digital terrestrial sound and multimedia broadcasting.

Information about author:
Oleg V. Varlamov, Doctor of Science, Head of Department of the Moscow Technical University of Communications and Informatics, Moscow, Russia