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Picking up FM radio on Randall RGT100
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<blockquote data-quote="kc2eeb" data-source="post: 57314" data-attributes="member: 811"><p>No, it's not a grounding issue, it is an RFI issue. </p><p>First, you notice the "reception" changes when you move the "antenna."</p><p>Definitely, an RFI problem. </p><p>Second, when you wrapped the cord in foil you made a basic magnetic field antenna, which responds to the magnetic component of an RF signal.</p><p>Third, a bad ground connection usually produces a multiple of 60 Hz, not RF.</p><p>Fourth, </p><p>Since grabbing the cord where it enters the amp cuts down the "reception"</p><p>go to Radio Shack and get snap on magnetic toroids they sell to eliminate computer noise. Wrap as many turns of the ac cable as you can, through and around, and as close to the amp as possible.</p><p>You are creating an rf choke.</p><p>It should at least lower the interference.</p><p>Fifth,</p><p>See if you have any cordless devices, remotes, electronic air cleaners, wireless modems, cordless alarms or doorbells, etc. in the area.</p><p>Hope this helps! Pat</p></blockquote><p></p>
[QUOTE="kc2eeb, post: 57314, member: 811"] No, it's not a grounding issue, it is an RFI issue. First, you notice the "reception" changes when you move the "antenna." Definitely, an RFI problem. Second, when you wrapped the cord in foil you made a basic magnetic field antenna, which responds to the magnetic component of an RF signal. Third, a bad ground connection usually produces a multiple of 60 Hz, not RF. Fourth, Since grabbing the cord where it enters the amp cuts down the "reception" go to Radio Shack and get snap on magnetic toroids they sell to eliminate computer noise. Wrap as many turns of the ac cable as you can, through and around, and as close to the amp as possible. You are creating an rf choke. It should at least lower the interference. Fifth, See if you have any cordless devices, remotes, electronic air cleaners, wireless modems, cordless alarms or doorbells, etc. in the area. Hope this helps! Pat [/QUOTE]
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Picking up FM radio on Randall RGT100
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