DB, VAM01/DV IF Digital-Quality Television Modulator

Digital-quality: The video quality of VAM 01/DV represents the right step just before the DTV generation. Using a new back-porch clamping circuit, combined with a full band linearity corrector its possible to obtain a perfect video quality with negligible distortions and intermodulations. All this means a superior video modulation quality.

Compatible with all standards. The VAM 01/DV is fully compatible with all video standards (PAL, NTSC, SECAM) and is available for B, G, M, N, I, D, K, K 1 and L modulation systems. VAM 01/DVprofessional multistandard modulator is designed to produce sound and vision modulated signals at any standard intermediate frequency.

Vestigial sideband SAW filter: For a perfect vestigial sideband modulation, a high-quality SAW filter is used complying with all international standards. These filters outstand for their excellent phase linearity and flat pass-band and group-delay characteristics.

Group delay precorrection: TV receiver group delay precorrection is available for all standards (optional).

White clipper: The white clipper is a factory set to guarantee the best modulation quality.

Sync restore: An internal sync restore circuit (optional) allows to ripristinare to a perfect video sync pulse also with corrupted

or scrambled video signal input.

PLL sound carrier: Sound and video intercarrier is synchronized by PLL to video line frequency for maximum stability and

negligible intermodulations.

Stereo and dual sound: Available with the dual sound facility (optional) for stereo or dual sound transmissions.

Panel metering: Full front panel metering and control for complete setting and performance checking.

Input for external frequency synchronization: Input for external frequency synchronization is available for higher frequency stability or precision offset.

Features:

• Output frequency IF (depending on video modulation standard)
• The output level of video carrier -10 to +5 dBm adjustable
• Output frequency stability ± 50 Hz
• Output impedance 50 Ω
• Output connector BNC
• Harmonic and spurious emissions < -60 dBc
• In-band intermodulation (3 tone CCIR test) < -65 dBc
• Input connector BNC unbalanced
• Input impedance 75 Ω
• Input signal level 1 Vp.p.
• Input return loss >30 dB
• Differential gain < ± 1 %
• Differential phase < ± 1°
• Amplitude frequency response (in the vision band) < ± 0.5 dB
• Group delay frequency response (in the vision band) < ± 20 nS
• S/N ratio > 65 dB
• 2T K factor < 1 %
• Luminance non linearity < 0.5 %
• Input connector XLR balanced
• Input impedance 600 Ω
• THD (50 KHz peak deviation at 1 KHz) < 0.4 %
• S/N (50 KHz peak deviation at 1 KHz) ≥ 65 dB
• Deviation from preemphasis curve (20 Hz to 15 KHz) ± 0.5 dB
• Operating temperature range -5 °C to + 45 °C
• Ambient humidity max. 95%
• AC power supply 115/208/230/240 Vac ±15%,47 to 62Hz
• DC power supply (optional) 24 Vdc ±20%
• Power consumption 19 VA
• Cabinet Standard 19” 1U
• Dimensions W 483, D 380, H 45 mm
• Weight 6.5 kg
• Dual sound /DS
• Group delay precorrector /GDP
• Sync restore circuit /SRC
• Battery operations 24 VDC