| Generally spoken, most stages inside the Scout are NOT properly decoupled. So rf-feedback but also internal noise is a well known problem for most Scout owners. One solution for the rf-feedback problem (if you really have such) is NOT to ground the radio but to isolate it. If you ground the radio the ground line just works as an additional antenna in most cases, which even enhances the problem. Take the coaxial cable from the Scout to your tuner and wrap it several times around a single ferrite stick (taken from an old radio) or better a bundle of these or trough a (big)ferrite toroid core from Amidon (use '43 type). The old ferrite stick, a bundle of seven sticks with 6-8 inch length does the best job, is relatively easy to obtain and cheap. Do the same with the mains line of the power supply (psu) and place radio and psu beneath. The radio is isolated now: from currents flowing into the radio and into the psu no unwanted rf on the radios case. The idea was published in one of the two famous antenna books edited by Orr and Cowan. Of course there may be an additional EMI-problem with you psu and there shurely are many inside the Scout but what I have tried to eplain above the the first big step forward. If you want further details, you may send a mail. |