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Acrodyne Industries launches ATSC DTV repeater
Apr 21, 2003 12:00 PM
Acrodyne Industries introduced the ATSC DTV repeater at NAB2003.
The ATSC DTV repeater mounts directly on
the pre-corrector board. The pre-corrector system allows for correction
of system group delay and non-linearity of the HPA.
The Ai DTVR-100U is composed of an 8-VSB receiver, 8-VSB modulator
(including pre-corrector), up-converter, high power amplifier and
on-channel band-pass filter. Power metering, status monitoring and
remote control systems are options.
The 8-VSB receiver generates a demodulated SMPTE 310M TS output. The
8-VSB modulator is composed of three main chipsets (channel coding,
8VSB filter, vector modulator). The package mounts directly on the
pre-corrector board. The pre-corrector system allows for correction of
system group delay and non-linearity of the HPA.
The channel converter module has very low phase noise and a very
high frequency stability using a multi loop PLL local oscillator and
high stable reference clock. System power is also controlled in this
module.
The high power amplifier uses the latest generation LDMOS
transistors. The unit senses temperature, current and voltage and has
an isolator for the protection from output mismatching. Overheating
protection uses thermistors. This HPA has under –36dBc IMD
without precorrection.
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