Wellington VHF Group, Inc: Online.

VHF+ RECORDS 2011-12

Digital Radio Mondiale is an OFDM radio transmission scheme having provision for callsign ident, text, voice, data, moving & still images, in bandwidths from 2.5kHz (non-standard ham mode) thru 96kHz (DRM+ FM band digital radio). It can operate in a single frequency network (SFN) to reduce band congestion and work cleanly even over HF paths – raising the possibility of a Digital National System distributed via HF.
I embarked on a series of experiments to test it out....

There are lots of ways to communicate via lightwaves and this project gets started with a simple optical headend transceiver compatible with direct modulation or the more complex modes by using a PC to do the modulation and demodulation using DSP and SDR techniques.

In 2009, when the inaugural EofA project to activate as many large Apollo-era dishes for a day of Moon talk on 23cm was announced, I had good reason to be interested. My workplace had one remaining 30.5 metre, fully steerable antenna that had been replaced with a smaller model and the site decommissioned, a fate already dealt to five similar size dishes and countless 10-metre class TVRO setups around the country.