Articles by Fred C (W6BSD)

Random-Wire Antenna

Is Resonance required? This is an extract from the ARRL Antenna book1 Please recognize that an antenna need not to be resonant to be an effective radiator. There is in fact nothing magic about having a resonant antenna, provided of course that you can devise some efficient means to …


Using DUDE-Star for digital contacts

DUDE-Star is a software developed by Douglas McLain (AD8DP) that connects to D-STAR, Fusion, NXDN, P25, Allstar, and even to the new digital mode designed by and for ham radio operators: M17. DUDE-Star includes a software IMBE and AMBE vocoder for encoding and decoding, but it can also use any …


NAVTEX for Emergency Communication

Many ham radio operators are interested in EMERCOM1. It can be useful to have a reliable source of weather information during an emergency. Some radios come with the NOAA2 frequencies already programmed in the memory. Hams have also programmed the following channels in their radios: NOAA weather channels …


Followup on: where are all the hams?

A few months ago, I wrote a blog post asking the question "Where are all the hams?". For that blog post, I generated heat maps of regions of the world showing WSPR1 activity. A few days ago, I sent an email to Philip Gladstone, from the PSK Reporter's …


Programming the radio module SA818

Before you can use it, the SA818 radio module needs to be programmed. This is a guide to program the SA818 radio module.


Connecting your TYT on a Raspberry-Pi

Over the years, I have made several Allstar, Echolink, and APRS nodes1. A few months ago, my friend JC (W6IPA) told me he wanted to build an Allstar node. I gave him this piece of advice: if I had to make a new Allstar node, I would create a …


Antenna Presentation

Over the last few months, I have participated in an increasing number of discussions, either on local repeaters or in zoom meetings, about newly licensed hams interested in operating in the HF bands. Two main questions kept coming back: what radio to buy and what antenna to use. It is …


Page 1 / 10