02-07-2023, 04:08 PM
When I moved to the house here I noted that outside the room I'd selected to be the "shack" the copper mains water pipe came up from the ground and into a hole in the brickwork to feed the house water system.
So from a common point of the radio gear I ran a short heavy gauge cable out through the wall and clamped it to this water pipe.
Heavy AC 50Hz hum on TX audio from just about everything was the result.
So in a garden bed that ran along that wall I drove in a couple of copper earth stakes around a metre apart linked together with heavy gauge cable, connected the shack earth cable to one of the stakes and the AC hum issue disappeared.
My wire HF antenna is off the other end of the house so the shack isn’t close by. My only experience with RF getting in to mike audio was with another wire antenna that ran a tad closer, and that was solved by a tip from Heil Sound re earthing of Kenwood microphones.
See “RFI Removal from Microphone Inputs” here:
https://heilhamradio.com/faqs/
So from a common point of the radio gear I ran a short heavy gauge cable out through the wall and clamped it to this water pipe.
Heavy AC 50Hz hum on TX audio from just about everything was the result.
So in a garden bed that ran along that wall I drove in a couple of copper earth stakes around a metre apart linked together with heavy gauge cable, connected the shack earth cable to one of the stakes and the AC hum issue disappeared.
My wire HF antenna is off the other end of the house so the shack isn’t close by. My only experience with RF getting in to mike audio was with another wire antenna that ran a tad closer, and that was solved by a tip from Heil Sound re earthing of Kenwood microphones.
See “RFI Removal from Microphone Inputs” here:
https://heilhamradio.com/faqs/
Damien
http://www.vk3rx.com
http://www.vk3rx.com