At 0114 EDT on Sat 17 May 2008 Jim Miller (KG0KP) wrote ... What is considered the practical duty cycle of the K3/100 ...?
-- Jim, Page 9 of the K3 manual states: Duty Cycle CW and SSB modes, 100% 10-min. 100W key-down at 25 C [77 F] ambient : : I assume the K3 owner's manual is more up to date than the following FAQ entry on Elecraft's website : : Q: Does the KPA3 have plenty of power to allow for 100-W full duty cycle operation in all modes? A: We may limit power level or maximum TX time for 100% duty-cycle modes (AM/FM/FSK). I can't say for certain, because we're still doing extended transmit tests. We used two fairly large, standard-size fans so they'd run at slow speed in most operating situations. But fans in this size are readily available with higher CFM ratings, so we could offer an extended- duty-cycle upgrade if that were warranted. This would only increase the depth of the fans; you wouldn't have to add fans to the top of the cabinet The fans have 4 speeds, are temperature controlled, and they turn off when not needed. They're large and quiet. In fact the entire fan panel is an upgradeable module -- we wanted to make sure the K3 could adapt to specialized requirements. So far our feedback from RTTY contesters is that they were able to operate a whole contest without getting the K3's heatsink too hot. The fans rarely went to full speed. _______________________________________________ Elecraft mailing list Post to: [email protected] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
