TheLostSwede
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The German Federal Network Agency, together with Agentschap Telecom Netherlands, BAKOM Switzerland and Elsäkerhetsverket Sweden have tested consumer HDMI and coaxial antenna cables and come to the conclusion that many of them don't meet regulations when it comes to Electromagnetic Compatibility (EMC). The four groups tested 30 coaxial antenna cables and 30 HDMI cables, of which only 11 percent of the antenna cables met the manufacturers declared attenuation and and only 10 percent of the HDMI cables met an acceptable EMC quality of at least 50 dB coupling attenuation.
Usually EMI, or electromagnetic interference is what's being discussed, but EMC is about how a device works and interacts in an environment so it doesn't cause EMI. In terms of cables, the normal cause for EMI tends to be because the cable ends up working like an antenna and starts to simplify the signal being transmitted inside the cable. This can cause all sorts of problems, with the most obvious example being poorly shielded USB 3.0 cables, which can interfere with 2.4 GHz radios, such as Wi-Fi, Bluetooth, wireless mice and headphones etc.
One of the main issues that was pointed out in the briefing is that if poor quality antenna cables are being used to connect set-top boxes or TVs to cable TV networks can cause system wide problems. A somewhat unexpected side effect from this is that it can also cause problems with radio reception in an unspecified area near the poor quality antenna cable, due to interference coming from the cable.
HDMI cables are said to potentially cause radio interference as well, but no further details were provided into specific issues here. Sadly there's no record of which cables were tested, but the report points out that there was no real difference between cheap and expensive cables. It should be noted that all cables tested were of quite short lengths of between 1.5 to 3 meters, so longer cables could perform even worse.
The four groups that did the testing made a list of suggestions to the EU Commission to look into, as well as suggesting that standards organisations need to step up their certification programs. Furthermore they want to test other types of cables, such as USB-C and even Ethernet cables, to make sure they meet the required standards. The sad news here is that according to a similar test done in 2012, the overall quality of coaxial antenna cables, the quality has actually gotten worse.
View at TechPowerUp Main Site
Usually EMI, or electromagnetic interference is what's being discussed, but EMC is about how a device works and interacts in an environment so it doesn't cause EMI. In terms of cables, the normal cause for EMI tends to be because the cable ends up working like an antenna and starts to simplify the signal being transmitted inside the cable. This can cause all sorts of problems, with the most obvious example being poorly shielded USB 3.0 cables, which can interfere with 2.4 GHz radios, such as Wi-Fi, Bluetooth, wireless mice and headphones etc.
![](https://www.techpowerup.com/img/1TtTXW2hfwggqDen_thm.jpg)
One of the main issues that was pointed out in the briefing is that if poor quality antenna cables are being used to connect set-top boxes or TVs to cable TV networks can cause system wide problems. A somewhat unexpected side effect from this is that it can also cause problems with radio reception in an unspecified area near the poor quality antenna cable, due to interference coming from the cable.
HDMI cables are said to potentially cause radio interference as well, but no further details were provided into specific issues here. Sadly there's no record of which cables were tested, but the report points out that there was no real difference between cheap and expensive cables. It should be noted that all cables tested were of quite short lengths of between 1.5 to 3 meters, so longer cables could perform even worse.
The four groups that did the testing made a list of suggestions to the EU Commission to look into, as well as suggesting that standards organisations need to step up their certification programs. Furthermore they want to test other types of cables, such as USB-C and even Ethernet cables, to make sure they meet the required standards. The sad news here is that according to a similar test done in 2012, the overall quality of coaxial antenna cables, the quality has actually gotten worse.
View at TechPowerUp Main Site