I found two articles on adding a fan to a T-4X. The first one uses only a diode & capacitor and uses the size of the capacitor to control the amplitude of the half-wave rectified DC voltage. The fan is configured to draw air OUT of the PA enclosure. _http://www.wb4hfn.com/DRAKE/DrakeArticles/TechTips/TransmitterFan.htm_ (http://www.wb4hfn.com/DRAKE/DrakeArticles/TechTips/TransmitterFan.htm) The second article uses a dropping resistor to control the fan speed, and the fan is configured to blow air INTO the PA enclosure. _http://www.k5dkz.com/t4xfan.html_ (http://www.k5dkz.com/t4xfan.html) Circuit differences aside, any thoughts on blowing air in as opposed to sucking it out? (Yes, I know the former may get the PA cage dirtier faster). Paul, K4MSG
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