Running a 220 VAC fans at 120VAC (just plug them in to the wall outlet) accomplishes the same thing. Quietly moving air out of the cabinet. I use one on my T4XB all the time.
220V fans are usually available cheap at ham fests because no one want them. 73 K1NR On Wed, 30 Nov 2011 20:07:23 -0800 Dennis Monticelli <[email protected]> wrote: > You can get the same airflow by running a larger fan at a > lower speed with > the benefit being lower audible noise. I have some > surplus 4" fans that > have rubber feet attached and just sit over the hot > portion of the > cabinet. I run them at a DC value below their ratings. > They don't walk, > aren't heard, and substantially lower the peak temps > within the radio. > > Dennis AE6C > > On Wed, Nov 30, 2011 at 5:21 PM, Bob Loving > <[email protected]>wrote: > > > Hi, Paul: > > > > I purchased a T4-XC with MS-4 speaker and AC-4 on the > cheap. The rig, > > etc., are in really nice shape and the cabinets of the > T4-XC and MS-4 had > > been repainted beautifully. > > > > The T4-XC had an 80-mm square dc fan on the back of the > PA cage. Two > > screws to mount it at the top and a tie wrap on the > left hand side (as > > viewed from the back). On inspection, the feed for the > fan was the 12.6Vac > > filament line with only a 1N4000-series diode in > series. The fan runs very > > quietly; it is produced by "PPM," (Pony Precision Motor > Co. in Taiwan), > > model FBA-9, brushless and ball bearing. Any 12Vdc fan > would probably work > > and you can find the 80-mm fans in abundance from the > computer stores. If > > you want a higher speed from the fan, add an > electrolytic capacitor the > > output of the rectifier to increase the average dc > voltage. > > > > 73, > > > > Bob K9JU > > > > > > > > _______________________________________________ > > Drakelist mailing list > > [email protected] > > http://mailman.zerobeat.net/mailman/listinfo/drakelist > > > > --------------------------------------------------------------------- Web mail provided by NuNet, Inc. The Premier National provider. http://www.nni.com/ _______________________________________________ Drakelist mailing list [email protected] http://mailman.zerobeat.net/mailman/listinfo/drakelist
