I have had the power supply on top of the radio with no problems. If the bridge rectifier is OK ( all the diodes are the same ) there should be very little magnetic field outside the power supply case. Jerry K8JRO -- FAQ on WWW: http://www.contesting.com/FAQ/tentec Submissions: tentec@contesting.com Administrative requests: tentec-REQUEST@contesting.com Problems: owner-tentec@contesting.com