Things such as the input capacitance of the devices plays a huge role in the design too. As a general rule, more capacitance is an issue as one goes up in frequency. Twice as many devices means twice the input capacitance.
And then there's the issue of ensuring equal power sharing between the devices. Doubling the number of devices more than doubles the circuit complexity. I played no part in the design of the KPA500 so I'll leave it there without speculating on the design choices made. 73, Ron AC7AC -----Original Message----- I think I was not clear and am possibly being misunderstood. First, I own a KPA500 and couldn't be happier. Second, in no way am I saying there is anything wrong with the KPA500 design. The question was if the power levels are the same and the individual device capabilities are similar, why would one use 2 or 4 devices. I merely reported what one experienced designer told me would cause him to use 4 devices. Was he right or wrong? Probably neither. As I indicated he was used to designing for a different market with a different cost/reliability model. If you are cost driven you will run closer to device maximums. If you wish to go for long life and a lower chance of failure you derate devices. David K0LUM ______________________________________________________________ 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
