On 10/22/2019 12:56 PM, Joe Subich, W4TV wrote:
The typical source of noise with PoE is from the switching supply -
either connected to a power injector or in some terminal device
(e.g. Router/Modem) with the Ethernet cable acting as the antenna.
Common mode chokes on the Ethernet cable as close to the device as
possible should help but experimentation (and replacing the noisy
power supply) will probably be necessary.
If that is the ONLY source, it might be better to replace it with a
linear supply of suitable current rating. I wouldn't be certain that it
is the only source -- perhaps there's some power conversion happening at
the unit (that is, up on the pole), in which case a choke there would
also be required.
But that doesn't answer the key question I asked Bill -- is the system
noisy or not.
73, Jim K9YC
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