The invention of the transistor allowed the development in the 1960s of small portable transmitters such as wireless microphones and walkie-talkies, although the first walkie-talkie was actually produced for the military during World War II using vacuum tubes.
12.
The station had the first traffic reports in the market in 1976 when Ken Strobeck did morning and afternoon drive-time reports in the " KUGN Traffic Rabbit, " a Volkswagen Rabbit equipped with a radio telephone and portable transmitter.
13.
This wartime government ban on civilian stations was lifted effective October 1, 1919, and in early 1921 Herrold was reissued an Experimental license, again with the call sign 6XF . ( He had previously been issued a license for a portable transmitter, with the call sign 6XE .)
14.
Marconi read through the literature and picked up on the ideas of physicists who were experimenting with radio waves, but did a great deal to develop devices, such as portable transmitters and receiver systems, that could work over long distances, Marconi came up with a functional system with many components:
15.
One particularly interesting project was the rebuilding of two Vanguard 0-6-0 55 ton locos for BSC Tinsley Park Works which included the installation of radio control operated by a portable transmitter carried by the driver and capable of operation with a range of up to 130 ft . Radio equipment was supplied by Telemotive.
16.
Prior to that, the same call letters were assigned to a portable transmitter in Chicago ( 1926-28 ) . ( They were assigned in order of availability, and have nothing to do with IBM . However, in later years, when the station played Top 40 music, they printed record surveys resembling an IBM keypunch card .)
17.
In particular Resistance International directed its efforts towards Afghanistan, where tens of thousands of Soviet troops had been based since the invasion of December 1979 . The International organised Radio Free Kabul, providing 25 portable transmitters that served not only as a means of transmitting radio propaganda in local languages, but also as a means of communication between the mujahideen forces.
