2 Meter Kilowatt Linear Amplifier

Custom built by Jim/W6PQL

Last updated: 2/2/2012

Features

It uses a single 50v LDMOS transistor made by Freescale Semiconductor, the MRFE6VP61K25H. The device is normally used in a push-pull configuration (it's a dual-device part), 

and the data sheet lists it as a 1.8 to 600 MHz unmatched device.

There are some handy features in this one:

    - Compact cabinet design (6.5 x 12 x 12 inches)
    - Full VSWR and over-temperature protection
    - Metering for PA current, with peak-reading LED bar graph meters for forward and reflected power
    - Full t/r sequencing
    - Low-loss high-power antenna relays
    - ALC output for the driver
    - Rear panel jumpers for selecting low power drive levels, or for up to 50w drive using a built-in 50w 10db attenuator
    - Low-noise temperature-controlled cooling fans
    - Front-panel AC switch for it's external power supply

Video's

Pictures

Front View of the amplifier. I had Jim add a PA voltage meter in addition to the PA Current meter. I like to keep a close eye on voltage especially with the high current demands of this amp at full power.

Close-up of the 50v LDMOS transistor made by Freescale Semiconductor, the MRFE6VP61K25H.

Overview of the inside of the amplifier with all of Jim's custom Amplifier Control Boards. Even a nice Dow-Key RF relay to do all the switching!

Rear shot showing the four fan vents, input/output, LNA connector, PTT, Power and ALC.