RF-Transmissions Systems - A2D Solutions : Screen TV Transmitters Exciters : Offset Systems

[RF-Transmissions Systems - A2D Solutions]

Offset Systems

Screen
SYNCHRONIZED OFFSET AND
PRECISION FREQUENCY SOURCE
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Multi-standard system realized to obtain ahigh precision frequency source wherever any video signal controlled bya precision reference is available.

SCS 412 SYNCHRONIZED OFFSET

The discontinuity of the presence of the video signaldoesn't spoil the functioning of the equipment, that differs from thecommon systems phase-locked at the reference signal.

The insensibility of the system to thediscontinuity of the reference signal has been achieved comparing thefrequency of the local source with the frequency of the video referencesignal and correcting the possible drift of the local frequency of theintegrated oscillator.

SCS 552 PRECISION FREQUENCY SOURCE

The offset allows 1 Hz or 0.999000999 Hzsteps to comply with any world standard.
Using only the "PRECISION LOCAL FREQUENCY SOURCE" SCS 552 allows to useall SCT series
synthesized transmitters as precision "offset" or "iso-frequency" mode.

SYNCHRONIZED OFFSETAND
PRECISION FREQUENCY SOURCE

TECHNICALCHARACTERISTICS
5 MHz GENERATORSECTION
Timing extractor source Reading resolution Reading period Free run drift Short term stability Output signal Outputs	Video subcarrier or video sync 0.6 seconds 5 MHz sine 1 V p.p. 4 + 1 monitor
LOCALOSCILLATOR SECTION
Output level Output level adjustment Channels frequency Frequency bands Maximum offset shift Output frequency deviation (jitter + phase noise) Spectral purity (non harm.) External reference frequency tracking C.W. I.F. output	+10 dBm ±2 dB 30 dB in steps of 2 dB (via software) Internally stored tables VHF I, VHF III, UHF ±32,000 Hz in steps of 1 Hz (CCIR) ±31,968.03197 Hz in steps of 0.999000999 Hz (FCC) < 0.2 Hz RMS @ 900 MHz > 80 dBc Nominal frequency 5 ppm 38.9 or 45.75 MHz (others on request)

Specificationsand characteristics are subject to change without notice.

Offset Systems Offset Systems
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Offset Systems