Experimenter to Honor Early Wireless Pioneers with Longwave

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Experimenter to Honor Early Wireless Pioneers with Longwave

Post by K9EZ » Thu Dec 19, 2013 7:15 am

(MAke sure you look at the link and the transmitter he made!)

Experimenter to Honor Early Wireless Pioneers with Longwave Transmissions

As he has over the past several years, Brian Justin, WA1ZMS/4 — an active participant in the ARRL’s WD2XSH 600 meter experimental project — will transmit voice and music on 486 kHz as WG2XFQ on Christmas Eve and Christmas Day and again on New Year’s Eve and New Year’s Day. Transmissions will begin at 0001 UTC and end at 2359 UTC.

Justin, who may be better known for his microwave exploits on ham radio, will use an AM audio loop modulating his vintage-style, homebrew transmitter to honor Reginald Fessenden’s Christmas Even 1906 AM voice transmission.

“While his original transmissions used a set of carbon microphones in the antenna lead to modulate the signal,” Justin explained, “WG2XFQ will be utilizing true Heising modulation in honor of Raymond Heising, who developed this early form of amplitude modulation during World War I. Justin constructed his 5 W master oscillator power amplifier (MOPA) transmitter using 1920s vintage components. He said a modern 500 W FET linear amplifier allows him to meet his WG2XFQ ERP limit of 20 W.

An RF engineer, Justin collects pre-1920 wireless gear and has a World War I Heising-modulated aircraft transmitter he’s planning to restore.

Kent Winrich
Owner, Consultant, Floor Sweeper and Official Thread Hijacker
Broadcast and Technology Blog http://sceotech.com/blog/
Raleigh, NC

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