| ABSTRACT:
A communications system wherein an intelligence signal modulates
the spacing of relatively narrow pulses of a fixed rate pulse train, and
these pulses key on a transmitter which employs a pair of series connected
avalanche mode operated transistors. These are repetitively powered via
a charged coaxial delay line, and the output, appearing across a resistive
load, is fed directly, or through a shaping filter, to a discone transmitting
antenna. At a receiving location, the received signal is amplified by a
wide band amplifier and fed through a reverse contoured filter (of the
transmitting filter, if one is employed). The signal is detected via synchronous
detection which locks onto the received pulse train, after which the modulation
evidence by the pulse train is recovered by a low pass filter. |