* **November 21, 2013 [NOTE: Third Thursday] - Bill Liles, NQ6Z “100 Years of Amateur Aerials”** The Radio Society of Great Britain is 100 years old this year. For the celebration they have gone through their archives and produced a set of talks. One talk is on 100 years of amateur aerials. Bill will present this talk with photos and discussion at the Nov. 21 AMRAD meeting.
Dolley Madison Library, McLean, VA.
[[!img RSGB_100YO.gif alt="RSGB"]]
[[!img Antenna_erection.jpg size="300x200"]] #Recent Meetings * October 10, 2013 - Ron Payne, WA6YOU - "Coax Connectors - The Intimidating Interface." Ron demonstrated installing PL259 and BNC coax crimp connectors and weatherproofing methods. * September 19 - Mark Braunstein, WA4KFZ, provided an overview of printed circuit board fabrication for the electronics experimenter. Mark has personal experience using CNC routers in a commercial enterprise. Other options for do-it-yourselfers include conventional photo-etching and contact etching with laser printed masks. A number of domestic and foreign fabricators offer fast turn around at low cost but with confusing choices for software and file formats. * August 8, 2013 - Maitland Bottoms, AA4HS, introduced us to digital voice communications on HF using FreeDV software. FreeDV is an application for Windows, Linux and MacOS (BSD and Android are in development) that allows any SSB radio to be used for low bit rate digital voice. The software compresses speech to 1400 bit/s then modulates a 1.1 kHz wide quadrature phase-shift keying (16-QPSK) signal which is sent to the Mic input of a SSB radio. On receive, the signal is received by the SSB radio, then demodulated and decoded by FreeDV. Communications is readable down to 2 dB S/N, and long-distance contacts are reported using 1-2 watts power.
**[[Click here for Past Meetings|pastmeetings]]** #Upcoming Events * ** January 26, 2014 - MMARC 2014 Post Holiday Hamfest** Odenton, MD, Maryland Mobileers Amateur Radio Club [[https://sites.google.com/site/marylandmobileers/hamfests-1/hamfest-2]] * **February 1, 2014 - Virginia State Convention (Frostfest)** Richmond, VA, Richmond Amateur Telecommunications Society [[http://www.frostfest.com]] * ** February 23, 2014 - Winterfest** Fairfax, VA, Vienna Wireless Society [[http://www.viennawireless.org/winterfest.php]] ---- [[AMRAD Wiki|amradwiki]]
FreeDV is unique as it uses 100% Open Source Software, including the audio codec. FreeDV represents a path for 21st century Amateur Radio where Hams are free to experiment and innovate without being locked into a single manufacturer’s proprietary technology. The same cables and hardware that you use for other digital modes that are based on PC programs will work with FreeDV, but you will need a second sound interface for the microphone and speaker connections to the FreeDV program. A USB headset of the sort used by gamers is all you need for the second sound interface.