Shortly after my posting on the Arctic F series fan, Garey raised the issue of PWM RFI. As it turns out, there are several models in the F series.. some with and some without the WPM feature. (see http://www.arctic-cooling.com/catalog/support_download.php)
As an afterthought, I included an Ebay link to an Arctic F12 WPM fan which, after reflection, may have been a bad, albeit well intentioned, suggestion. This particular model has a built-in WPM amp which, as Garey appropriately pointed out, might have some associated circuitry which could generate RFI. So if you do consider the Arctic F series for cooling your equipment, I'd suggest the older model without the WPM amp. Comments and opinions welcomed! Doc Hi Doc - I looked at the fans you referenced below. They mention "PWM" (Pulse Width Modulation) which is a way to control fan speed by the 'duty cycle' of the applied AC. It says there is "a PWM 'amplifier'" in the fan, which should be silent, but I wonder if there are other associated electronics in there which might generate RFI? I assume you haven't experienced any problem, but I wonder if you have ever probed or listened for RFI when they are in operation? 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 4-B, C-Line& TR-4/C Service Supplement CDs < www.k4oah.com> halo.net wrote: > Very cool discussion for Drake fans.. I glued a couple of very quiet > Arctic F12 120mm together, wired in series to an old surplus wall wart > and use them on top of all my vintage valve equipment. They're cheap, > quiet, have fluid dynamic bearings for longevity and can be flipped > over for suck or blow... you can pick them up on Ebay for $8.80 a > piece shipped.. > > http://cgi.ebay.com/NEW-ARCTIC-COOLING-Arctic-F12-PWM-120-mm-120mm-Case-Fan-/380237785094?cmd=ViewItem&pt=LH_DefaultDomain_0&hash=item5887f02806 > > < > http://cgi.ebay.com/NEW-ARCTIC-COOLING-Arctic-F12-PWM-120-mm-120mm-Case-Fan-/380237785094?cmd=ViewItem&pt=LH_DefaultDomain_0&hash=item5887f02806> > > Doc > Halo.net: http://mysite.verizon.net/halo.net/ > _______________________________________________ Drakelist mailing list [email protected] http://mailman.zerobeat.net/mailman/listinfo/drakelist
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