Interferências de fontes não intencionais · Fontes Chaveadas . Rádio Digital For distances up...
Transcript of Interferências de fontes não intencionais · Fontes Chaveadas . Rádio Digital For distances up...
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Interferências de fontes não intencionais
Flávio A. B. Archangelo
Anatel Brasília, 30 out. 2017
Workshop sobre interferências de fontes não intencionais e suas ameaças para os serviços de telecomunicações
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Tipos de Interferências
MANIFESTAÇÕES
NATURAIS ARTIFICIAIS
TERRA ESPAÇO INTENCIONAIS NÃO INTENCIONAIS
Harmônicos
Espalhamento
Compartilhamento
Ilegais
RFI de não intencionais se destacaram nos últimos anos
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Iluminação: Fluorescentes
Reatores eletrônicos e starters
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Iluminação LED em VHF
LEDBenchmark
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Iluminação LED em VHF
“Severe case of digital TV/DAB signal disruption...The product has been reported by users to completely cut out digital TV and radio reception even affecting neighbor
houses"
40 dB, eFM
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LED em VHF
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LED x TVD (UHF)
https://www.youtube.com/watch?v=1JgOh4CriTA
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“Impact of unwanted RF energy generated by non- radiocommunication equipment to radiocommunication services”
353 MHz 2,5 km
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Iluminação Pública e Semáforos
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Semáforos
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Degradação SNR
20 dB aprox.
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Eletrodomésticos
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Eletrodomésticos
Geladeira, batedeira, ventilador, liquidificador, micro-ondas, etc.
Vellano, Villas Boas
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Elevadores (PWM)
Gir0ep
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Cercas Elétricas
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Rede Elétrica
ARRL RFI Handbook
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Fontes Chaveadas (SMPSU)
EMCC RSGB
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Fontes Chaveadas
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Rádio Digital
“For distances up to about 20 km, digital reception was achieved at 90% of the points in three of the four routes. Only on the Northwest route this figure drops to about 50%. This is due to the fact that, as illustrated in Fig. 9, the first portion of this route runs through an industrial area that also has dense aerial power lines, that raises the noise floor making digital decoding difficult”. (Measurements…)
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Consequências dos ruídos
Perda de cobertura;
Redução da qualidade do sinal;
Perda de audiência;
Imagem de ineficiência tec. tradicionais;
Dificuldades para adotar novas tec;
Relativização esforços da digitalização;
Aumento de potência, consumo de energia;
Gap Fillers;
Sucateamento e supervalorização de faixas;
Subaproveitamento recurso espectral.
Charles Kelly, Nautel
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Tecnologias promissoras
• Energia Solar;
• Energia Eólica;
• IoT;
• Smart Cities;
• WPT;
• Carros elétricos;
• Como sem EMC?
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Sistemas Fotovoltaicos
Até 40 dB
EMCC RSGB
40
50
60
70
80
90
100
110
120
130
150k 300 400 500 800 1M 2M 3M 4M 5M 6 8 10M 20M 30M
Level in
dB
µV
Frequency in H z
CE Single Phase S N 457 A uto Test
Res. 442 ANATEL - V oltage on M ains QP - C lasse B Res. 442 ANATEL- V oltage on M ains A V - Classe B
Preview R esult 1-PK+ Preview R esult 2-A VG
F ina l R esult 1-Q PK F ina l R esult 2-A VG
Res. 442 ANATEL - V oltage on M ains QP - C lasse B
Res. 442 ANATEL- V oltage on M ains A V - Classe B
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EMCC RSGB
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ACMA
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Referências • ACMA: https://www.acma.gov.au/Citizen/Complaints/Telco-complaints-2/Interference-and-reception-
complaints
• ACMA. Can LED light cause TV interference? https://youtu.be/jWdu9US_7MY
• Gir0ep. Radio interferens – Lift Machite. https://youtu.be/UEH6FFqqeEk
• Gruber, Mike (ed.). The ARRL RFI Handbook. 3tr Edition. ARRL, 2010.
• Kelly Junior, Charles. Implications Of Increasing Man Made Noise Floor Levels On Radio Broadcasting. NAB. http://www.nautel.com/resources/presentations/
• LED Benchmark: http://www.ledbenchmark.com/faq/LED-interference-issues.htm
• LED Light Interference. https://youtu.be/NCCuZmGhhuc
• Lima, F. F. et ali. Measurements of Medium Wave HD Radio Reception in a Dense Urban Region. http://ref.scielo.org/2xh2yh
• Rogers, John. EMC – Diagnosing and Reporting RFI. EMC Committee, Radio Society of Great Britain: http://rsgb.org/main/technical/emc/
• TVD UHF x LED: https://youtu.be/1JgOh4CriTA
• Vellano Neto, Victor. Estrutura Técnico Normativa para Promoção da Compatibilidade Eletromagnética. Seminário de Defesa Espectral. http://www.radioamadores.org/biblio/apres/CNR2014/Victor-LABRE-SDE-CNR-2014.pdf
• Vilas Boas Magalhães, Gilberto. Rede Sibratec Compamagnet. Seminário de Defesa Espectral. http://www.radioamadores.org/biblio/apres/CNR2014/Gilberto-LABRE-SDE-CNR-2014.pdf
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Obrigado!
Flávio A. B. Archangelo
Anatel Brasília, 30 out. 2017
Workshop sobre interferências de fontes não intencionais e suas ameaças para os serviços de telecomunicações