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Odd interaction between phone, lights, and HR21-100sports
Posted 09 February 2012 - 12:04 PM
I thought that the phone line itself might be acting as an antenna to pick up RF interference from the lights, but if I leave the line connected at the wall and disconnect it from the HR21, the hum goes away. I have tried using phone cables of different lengths in an attempt to find a length that is not a harmonic of the interference, but that had no effect on the hum. I have tried routing the phone line through a surge protector and without the surge protector with no change.
If it was a grounding problem with the HR21, I would expect the hum to be independent of whether the lights were on. The lights and the HR21 are on different electrical circuits, but both are from the same service panel and both are grounded properly.
The only thing I have not yet tried is using a shielded phone cable that is designed for use with ADSL modems, but since the hum is not present when the existing cable is attached to the wall but not to the HR21, I doubt this will solve the problem.
Does anyone have any ideas?
Posted 09 February 2012 - 03:35 PM
One thing comes to mind. Have you installed the telephone line filter for the ADSL modem? If it is installed try to substitute another one. Removing the filter works some of the time also. If these suggestions do not work then try another receiver/dvr in the tv room if you have one and put the HR21-100 where the other unit was located. Best of luck in resolving your problem. If it persists then I am sure that other people are willing to assist you.
Posted 09 February 2012 - 04:38 PM
Posted 10 February 2012 - 07:28 AM
I do have a DSL filter on the phone line. I do not remember if I checked for the hum without the filter, but I can try that. I also have two more DSL filters that have never been used. I can try one of those.
I do not use CID, so the only reason the phone line is connected to the HR21 is to order PPV. The HR21 is not connected to the internet, but I do have a 802.11(n) router. Line of sight from the router to the HR21 is only about 18 feet with no walls in the way, but it would be extremely difficult to run an ethernet cable from the router to the HR21. I know that USB wireless transmitters do not work on the HR21.
What is the best way to connect the HR21 to the internet wirelessly?