Acrodyne Industries launches ATSC DTV repeater
April 21, 2003
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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