Re: Isolate any jacks/controls from metal chassis? #ubitx

Tom, wb6b
 

A metal chassis provides a very good low impedance ground reference to all the circuitry. Best to ground everything, including making sure the screws holding down the circuit board have a good connection to the chassis in all four corners. 

The wires to each of the various jacks and controls should be fairly short and twisted together to reduce RF pickup within the metal box. Such as twisting the volume control wires in a set, the encoder in a set, microphone in a set, the antenna wires in a set. Best to let the antenna connector be at one side of the box, close to where the antenna is connected to the PC board, the power connector close to where it connects to the PC board, and the audio/digital at the other side. That would minimize the very slight possibility of the minimal ground loops (minimized by the low impedance of the chassis ground) having any effect. But the big common ground should be a benefit virtually in all cases. 

Tom, wb6b

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