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Originally Posted by G4EBT
Using about 20 ft of wire strung round the workshop for an aerial, the set pulls in several stations on medium and short waves, but on some stations there's a background heterodyne.
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Ok to everything said previously. The heterodynes however, could be caused by second-channel interference. This may point to badly aligned aerial trimmers or O/C caps in the aerial circuit. I don't have info on the I F frequency to hand but if it has a low I F (120khz or so) there is probably an I F filter which may need a tweak, but check general alignment first.
Rich.