Eric Swartz: > At 50W it will not have enough drive to drive most legacy tube based > amps to full power, especially the widely used 3-500z based legacy amps > from Heath and Ameritron.
Very true. But I suspect few owners of the ADT-200A would even consider using it with such an amplifier. What the ADT-200A does presently offer -- that nobody else does at the moment, is utilize an advanced PA pre-distortion technique (apply opposite non-linearity) to significantly drive down transmitted RF non-linearities (typically -50 dBc 3rd-order). Moreover, the transceiver, right out of the box, allows the user to sample the output of an amplifier (I plan on using an SPE 1K-FA) and feed the RF sample back into the transceiver's monitor point such that the pre-distortion algorithm drives down IMD of the total transmitted output. For amateur radio, that's an extremely novel and powerful feature derived from Mil and commercial applications. In effect, the ADT-200A takes a solid-state amplifier that would otherwise offer only mediocre SSB IMD performance and turn it into one with stellar performance -- without ever having to take a screwdriver to the amp. That's impressive. Paul, W9AC ______________________________________________________________ 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
