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Tech Head - The Technology Section
HDMI cable interference
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<blockquote data-quote="deeptho" data-source="post: 1153218" data-attributes="member: 215446"><p>Today I did some experiments with 2 other hdmi cables. One of them reduced the interference</p><p>level buy 9 dB. The second one was a bit shorter (2m instead of 3m) and thicker and reduced</p><p>the interference by 20dB. This was measured with a rod antenna connected to a usrp and with sdrpp</p><p>(only relative measurements possible).</p><p></p><p>With that second cable, the interference when measured on the coax cable became invisible on the spectrum,</p><p>but I could still here in the am demodulation that was on the switching on and off of the hdmi signal.</p><p></p><p>With all three cables I also tried installing a ferrite mantle. That made no difference whatsoever, no matter where I placed it. That is not what I would expect for common mode signals.</p><p></p><p>In any case it shows a big difference between cables.</p><p></p><p>By the way: a long time ago when I bought my tv, the seller tried to sell me a really expensive hdmi cable</p><p>with gold (coloured) connectors. He claimed it was much better, but I did not believe it. Perhaps he was right after all,</p><p>but not regarding "better picture quality" (obviously nonsense) but less interference.</p><p></p><p>Of course, he did lie to me about the TV: I got it for a reduced price because it was a "shop display model". I asked how many hours it had been playing and he gave a low number. At home, after discovering the secret remote code </p><p>to enter service mode, I discovered that the TV had been used for at least 1000 hours. I did not complain afterwards.</p><p></p><p>The Philips TV is still working fine today. It has DVB-T but not DVB-T2. This show its age. So it has been a good </p><p>purchase anyway.</p><p> </p><p>It was also one of the last "non-smart" TVs that you could buy, which is a huge bonus as well: fast channel changing, no nagging about updates, no "phoning home to the company" and no other crap such as the samsung TV that I had and that destroyed itself after pressing accidentally a button in service mode.</p></blockquote><p></p>
[QUOTE="deeptho, post: 1153218, member: 215446"] Today I did some experiments with 2 other hdmi cables. One of them reduced the interference level buy 9 dB. The second one was a bit shorter (2m instead of 3m) and thicker and reduced the interference by 20dB. This was measured with a rod antenna connected to a usrp and with sdrpp (only relative measurements possible). With that second cable, the interference when measured on the coax cable became invisible on the spectrum, but I could still here in the am demodulation that was on the switching on and off of the hdmi signal. With all three cables I also tried installing a ferrite mantle. That made no difference whatsoever, no matter where I placed it. That is not what I would expect for common mode signals. In any case it shows a big difference between cables. By the way: a long time ago when I bought my tv, the seller tried to sell me a really expensive hdmi cable with gold (coloured) connectors. He claimed it was much better, but I did not believe it. Perhaps he was right after all, but not regarding "better picture quality" (obviously nonsense) but less interference. Of course, he did lie to me about the TV: I got it for a reduced price because it was a "shop display model". I asked how many hours it had been playing and he gave a low number. At home, after discovering the secret remote code to enter service mode, I discovered that the TV had been used for at least 1000 hours. I did not complain afterwards. The Philips TV is still working fine today. It has DVB-T but not DVB-T2. This show its age. So it has been a good purchase anyway. It was also one of the last "non-smart" TVs that you could buy, which is a huge bonus as well: fast channel changing, no nagging about updates, no "phoning home to the company" and no other crap such as the samsung TV that I had and that destroyed itself after pressing accidentally a button in service mode. [/QUOTE]
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HDMI cable interference
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