Exciting times in soft modem development

The active and exciting development of the sound card soft-modem terminal node controller modulators/demodulators will help us continue to raise the throughput of our AX.25 connections as new releases arrive.

The need for 9600 bps AX.25

Where AX.25 fits into the ARS digital landscape

Despite its age AX.25 can compete with the slick newer digital technologies. Let’s see where packet fits into the digital landscape.

APRS AT Golden Packet 2016 NoVA Report

Using modest gear, station #6 of the Appalachian Trail Golden Packet exercise confirms 9600 bps works well for passing packets north and south.

Antenna pattern plots: Good intentions vs. good data

Just say no to handcrafted data graphs

In the 21st century should we believe antenna graphical gain data based on hope and hearsay? J-pole antenna gain drawings are a common bad example.

SlimJIM and Antenna Gainflation

E-plane gain plots of J antenna variations

Understanding why SlimJIM antenna aficionados hype the gain in their marketing and discussions.

UHF connector improvements

W0QF's test setup

Cutaway examinations, mathematical calculations, VNA measurements and proposed compensation techniques round out a nice article by W0QE about the UHF connector.

The dipole antenna, how industry defines it

All dipole antennas... according to the IEEE

Is a dipole antenna defined by its behavior alone or also how one energizes it? The answer exists in IEEE and historical literature.

Ground effect

40m monopole over various ground conditions

Ground conductivity, permittivity and the effects on vertical monopoles.

Understanding digitization

A Youtube video by “Monty” Montgomery explains and demonstrates digitization concisely and expertly.

Help Hamradio.me remove the ads

All, The time has come to change the way this web site operates and considering removing the ads plus completely revamping the format to include support for portable devices. I would never go the route of some web sites with numerous pop up ads and other very disruptive behaviors.  However, the revenue from advertising continues […]