Archive for date: March 16, 2011

3-D printing method advances electrically small antenna design

March 16, 2011 | Amateur Radio | By: Mark VandeWettering

Antenna design and manufacture has historically been pretty, well, primitive. There are reasons for this: early on, solving the large systems of equations to adequately model complex antennas was difficult. Luckily, advances in computers and software make that much more tractable. Now, we can design antennas with dozens or even hundreds of elements, and in […]

Followup re: crystal microphones

March 16, 2011 | Amateur Radio, electronics | By: Mark VandeWettering

A bit more digging on yesterday’s topic (crystal microphones) yielded this book, published by the U.S. Army, entitled CW and AM transmitters and receivers which included some additional useful information regarding the construction of crystal microphones.