WiFi antenna: metal connector causing hum & cracks

DIY Products&Projects
1

In one of my builds I have used the Arylic external WiFi rod-antenna: Wifi/ Bluetooth External Antenna for DIY Amplifier-Arylic.com
The connector is a RP-SMA.

For my build I have built a Up2Stream Mini inside the metal casing of an amplifier. And I have drilled a hole in the metal casing, to let the RP-SMA connector stick through it, and put the WiFi rod antenna on top of the RP-SMA connector sticking to the outside.

My experience now is that this causes hum & cracks on the speakers. I guess the RP-SMA connector-metal making contact to the metal casing of the amplifier, is causing this.

Question

  1. Anyone recognizes this?
  2. What is the best way to solve?
  3. Suggestions for isolating?
2

The threaded barrel of connector should be electrically isolated from the antenna, so shouldn’t cause you a problem. I have used these on a couple of projects and have had no problems.
I would suggest that you remove the antenna connector from the chassis and see if the problem persists. If it doesn’t then the problem may be elsewhere.
Maybe a ground loop?

3

@Steve1
You were right steve. It had nothing to do with the antenna and connector.
The hum/cracks I experienced was caused by chassis parts of the amplifier not making good enough contact.

Issue solved!