T0-220 style power film resistors are fairly cheap and can easily be mounted on heat-sinking surfaces.
David G3UNA > Hm, I wonder if the KPA500 has or can have provision for this. That > amp can be driven to full output by 30 watts or so, IIRC. With the K3 > (or K2), power control could be done automatically by having the amp > tell the radio that it's active over the serial interface, but it's > clear the KPA500 has much provision for being used with radios other > than the K3. > > 73, doug > Tom W8JI wrote: > > > The correct approach would be an > > attenuator pad so the radio could run at near full power and > > not have a chance of overdriving the amp, ... > > I don't understand why more people don't do that. For example, a 3 dB > attenuator between the transceiver and amplifier ensures that a 100W > exciter won't overdrive an amplifier that requires 50W of drive. The 3 > dB loss on receive is hardly ever an issue but if you're worried about > it, just put the attenuator inside the amplifier, after the T/R relay. > > Seems like a simple, foolproof solution. > > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
