December 2008 – Ham Radio . Magnum Experimentum

New QRP Radio Now Includes Spiffy Case

August 15, 2010December 20, 2008

QRPKits.com has introduced the next model of their famous DC-xx series, the DX-xxB where xx = 20, 30 or 40 meters.

These are single frequency QRP units that are easy to build and fun.

The QRPeanut Can transceiver featured on HamHelpDesk uses a DC-40A unit.

This easy to build QRP transceiver is a single channel direct conversion crystal controlled assembly available for use with CW.

All you need to add is antenna, keyer, headphones and power. An antenna matcher makes good sense too.

Improvements include:

2 Meter, 5/4 Wave Antenna Revealed

November 3, 2018December 20, 2008

We remove the mystique surrounding the 5/4 wave antenna comparing center and end fed approaches. One conclusion is the end fed 5/4 wave antenna shows little promise as a vertical antenna for terrestrial use.

Can a 2m J-Pole be used at 440?

March 5, 2015December 17, 2008

Analysis to suggest you really can use a 2 meter J-Pole in the 70cm band.

1/2 Wave vs. 5/4 Wave VHF EZNEC Shootout

November 3, 2018December 16, 2008

Longer is not always better in the world of antennas. Such is the case of the 5/4 wave vertical antenna… a Super J-Pole Wannabe Antenna.

Airplane Navigation Receiver Antenna Balun

February 26, 2012December 8, 2008

An airplane mechanic friend, who also happens to own a 35 year old single engine Cessna airplane, was working on his tail light when he saw broken and aging components in his tail mounted navigation antenna. While working to fix the problems he discovered an interesting balun technique.