Does the KPA3 have plenty of power to allow for 100-W full duty cycle operation in all modes?
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.
The K3 can run at its 100W level for normal TX time for 100% duty-cycle modes (AM/FM/FSK). 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.
