[RFI] Astron fan circuit noise

[John Rader]

My Astron SS-30M makes noise on 80m each time the fan starts. The noise 
starts out low in pitch and increases for about 10 seconds then stops. The 
fan continues to run for about 30 more seconds. It is not related to fan 
speed or duration, only starting.

Any Ideas on how to eliminate this noise?
John K5XTX

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