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81. You are able to hear signals in the voice/SSB mode but not in the SITOR (NBDP) mode. What is the most likely cause?
A failure in the 500 Hz IF filter, used exclusively for SITOR/NBDP reception, is the most likely cause when voice/SSB reception remains functional. This filter is not used in voice/SSB mode, so its failure would only affect SITOR/NBDP reception while leaving other modes unaffected.
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