We'll have to agree to disagree because everything I read says otherwise. Look at how factory equipment is made. On my radios, tuner, amp, swr meters, external filters etc. the antenna jack is fastened directly to the chassis. They don't run the signal inside the radio first. Once rf gets inside a radio where it's not supposed to be it's hard to stop.
Read up on "the pin 1 problem" if you haven't already done so.
Max
On Thursday, July 8, 2021, 01:54:43 PM CDT, jerry@... <jerry@...> wrote:
On 2021-07-08 11:47, Max via groups.io wrote: > Sounds like rf maybe coming in through the mike cable. The bigger > problem is the fact that none of the jacks (mic, keyer, antenna, etc.) > are grounded to the case BEFORE entering the radio. AS is, I'm not > sure if the case does much shielding at all. Sorry to say it, but this > part is a bad design!
** I disagree.? Vehemently.? Connectors should NOT be individually grounded to the case.? The case should be grounded to the ground plane in one spot, and one spot only.
? ? If you ground the case in multiple places, you risk causing RF currents to flow through it.? This can cause the case to act as an antenna, rather than as a shield.? For low level audio, it can cause "ground loops".? Same deal.
