Y aca esta resuelto el misterio de porque un modelo de la B-25 tenia el sistema de salto de frecuencia:
Resumo:
DAVE LARSEN ZS6DN SOUTH AFRICA'S LIVING LEGEND OF RADIO
Dave moved with Racal-SMD to Pretoria - he relocated the family owned Salbu Experimental Radio Station and continued research into the design techniques for utility HF broadband solid-state receivers and transmitters. This work led to the development of the world's first solid state broad band HF manpack transceiver. Versions of this transceiver were manufactured by his company, Racal Electronics in South Africa , England, the United States and in a number of other countries.
Dave became Technical Director of the fledgling Racal Electronics South Africa in 1965. In 1972 he was appointed Managing Director of the same company that was by now employing over 1000 people.
During the seventies Dave and his team evolved an HF frequency hopping system. The concept was initially rejected by the experts at the time. Some 15 years later the authoritive publication, Janes Defence weekly wrote in the 11 July 1987 edition : "Frequency hopping is probably the most popular spread spectrum technique. Claimed to have been pioneered in South Africa, it now appears in tactical equipment manufactured by most of the major international radio communication companies."
http://www.militaryphotos.net/forums/sh ... io-Pioneer