630M Station

630M Amp

QSL cards



Misc stuff


Amp Schematic

Review by KB5NJD

630 meter class D Power Amp designed to produce 200 watts output into a 50 ohm load with only 0 dbm (1mw) input at 472 to 479 khz .The output stage is a push-pull design using a pair of RFP250’s , each of these fet transistor will handle 250 watts, this is a very rugged output stage. The driver circuit for the output stage uses a fet driver chip with associated parts to control the drive and the bias of the output power transistors. The Amp will produce 40 to 200 watts into a resonant antenna with a 14 to 30 volts power supply. I use this Amp with an Elecraft K3 but also works with Flex, Kenwood TS570 , TS590 and other transceivers.

This Amp will plug and play with the new Elecraft K4.

See Elecraft app notes for K3 and K3s 630M operations.