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TV Transmitter /Transposer - 500W UHF TV

Supplier: ARFC

The Transmitters TX 100-200-500 and the Translators (Transposers) versions RP 100-200-500 are fully solid state compact TV broadcasting units. They have very high efficiency obtained using LD-MOS devices duly corrected to improve the linearity.

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General Features & Options

  • AGC features IF muting and RF output power amplifier switch off in absence of vision signal or absence of local oscillator locking.
  • Transposer mutes in absence of input, avoiding transmission of noise.
  • 'Soft start' on appearance of transposer input, to avoid output power surges.
  • Automatic RF Level Control (ALC) to stabilise the high power amplifiers RF output level over a limited range.
  • Synthesised, programmable local oscillator with microprocessor control.
  • High stability reference oscillator for line offset operation or for precision offset. This option can be supplied both for transmitters and transposers, also with the possibility to lock the internal reference oscillator to an external frequency standard (eg. GPS receiver).
  • Frequency-agile converter option with output channel front panel selection. 
  • SAW IF fi lters, specified with reference to the particular standard are employed in the VSB modulator of the transmitter or to define the channel pass-band in the IF stages of the transposer.
  • Video processor provide automatic video gain control, sync pulse shape restoration with amplitude stabilisation, digital black level clamping.
  • Dual channel sound carrier + stereo encoders (IF modulator options).
  • IF linearity precorrector to reduce in band intermodulation products and to correct distortions due to amplifiers non linearity.
  • Input filter with low insertion loss and high selectivity for transposers (4 resonators).
  • Output band-pass and notch filters.
  • Alarm circuit for output power lower than a pre-set threshold (normally 3dB /half power).
  • Telemetry to provide remote monitoring and control, using either digital (options: RS 485; RS232; Ethernet 10/100 Base/T) or analogue interfaces (see Network Manager hardware /software documentation).

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