An HF Amplifier for your QRP Rig

During our Sunday night Tech Net in Northern Virginia one of the participants described a 140 watt amplifier he just finished building for use on the HF bands.

My immediate thought was “Hmmm, he already has a 100 watt style typical HF radio. Why does he need something that does 140 watts?”

The I remembered he also has a QRP rig which generates the typical 5 watts or so and this linear amplifier allows this QRP rig to be just like the typical 100 watt radios when you need or want it.

The amplifier concept comes from a company called…

Read moreAn HF Amplifier for your QRP Rig

Johnson Match Box works well at Field Day 2008

At Field Day 2008 our primary Phone station used a 135 foot ladder fed dipole as the primary antenna. The ladder line is home brew with wood spacers putting the parallel 14AWG wire about 5 inches apart.

For years I have used a home brew fully balanced matcher of a design found on the Internet. However, the results have been less than what I would expect.

A club member mentioned he had available a big Johnson Match Box. I said please bring it. Here it is on our operating table with the antenna feed connected.

Read moreJohnson Match Box works well at Field Day 2008