Persistent hum on my connected phone
MichaelW:
Thanks for your suggestions:
It is an old Sony powerless phone (and single line phone).
Reversing the polarity of the power supply (plugging it in upside down) made no difference.
I've switched to the cordless phone so cannot try pulling the Ethernet cable. But I did move the Obi close to my router and tried a 12" Ethernet cable, which did not help.
Shale:
Quote from: MichaelW on April 25, 2013, 07:05:21 am
It is an old Sony powerless phone (and single line phone).
Unpowered Sony. No battery even? That sounds rare.
I am suspecting that somehow the hum is being capacitively coupled to the phone by your hand. If that is guess correct, then grounding yourself would cut the hum. If that is the case, it sounds like a quirk of the phone.
Rick:
Phone
MichaelW:
Batteryless phone is a Sony IT-B5. Has 10-number memory, even without a battery. Solid and dependable, I don't recall it ever causing hum before.
Ostracus:
I would still try the "shielded" (metal shield visible at the ends) vs "unshielded" (clear plastic head) Ethernet cable. The majority of Ethernet cables people run into are unshielded.
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