IN3LBQ on the Hühnerspiel (Amthorspitze) - photo by IN3OTD

Amateur radio RF power amplifiers

These pages contains various information about several RF power amplifiers, mainly for the HF bands, that I have built and characterized.
Most of the measurement were done with the automated system described in the automated IMD measurements page, so a standard set of data is usually shown:

Here is a list of the amplifiers characterized so far:

HF QRP power amplifier

Measurements on the QRP Project PA-2008, a 5 W amplifier for the HF bands.

DL2EWN 5 W wideband PA

Measurements on a wideband 5 watt amplifier, designed by DL2EWN.

DL2EWN 1 W wideband PA

Measurements on a wideband 1 watt amplifier, designed by DL2EWN.

Wideband low-power amplifier

A small power amplifier for the HF and VHF bands using a PD85004 LDMOS in class A.

Wideband push-pull low-power amplifier

Another small power amplifier for the HF band using two PD85004 LDMOS in push-pull (class AB).

HF/50 MHz Class A PA

A Class-A simple QRP power amplifier covering the HF and the 50 MHz band, designed by Jim Veatch, WA2EUJ.