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.


630 meter 200W PWR AMP with combo lowpass filter and scopematch