Radio communication transmitter

Details Radio communication transmitter Radio communication transmitter

1974-02-20

1976-02-10

Safourek, Benedict V.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

179 15BY, 179 15FD, 325155, 332 21, H04B 102

Patent

active

039381560

ABSTRACT:
A multi-channel radio communication system comprising a number of stations for the transmission of speech between the stations, each station transmitting not only the speech signal but also a special so-called busy signal located in a frequency band beyond the speech frequency band, which busy signal informs the remaining stations in the group of which are not occupied by a call to another station that the actual carrier frequency or channel is occupied and cannot be selected for a new connection. According to the invention the busy signal is automatically controlled in amplitude as a function of the instantaneous value of the speech signal and this in such a manner that the envelope of the combination of the speech signal and the busy signal is maintained substantially constant so that as a result of the normal interruptions in a conversation the busy signal will be automatically and repeatedly adjusted to full amplitude.

REFERENCES:
patent: 3376509 (1968-04-01), Willcox et al.
patent: 3452156 (1969-06-01), Engelbrecht
patent: 3477042 (1969-11-01), Wachs
patent: 3617892 (1971-11-01), Hawley et al.

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