A/V IF Modulators
Digital-quality. The video quality of VAM represents the right step just before the next DTV generation. Using a new back-porch clamping circuit, combined with a full band linearity corrector it’s possible to obtain a perfect video quality with negligible distortions and intermodulations. All this means a superior video quality with only a slight difference compared with digital TV.
Compatible with all standard composite video and audio signals (PAL, NTSC, SECAM). Available for B,G,M,N,I,D,K,K1 and L systems. VAM professional 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 an high quality SAW filter is used complying all international standards. This filters outstand for their excellent linear phase 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 factory set to guarantee the best modulation quality.
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 dual sound facility (optional) for stereo 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 stability or precision offset.
A/V IF Modulators
General characteristics:
Output frequency IF (depending on video standard)
Output level of video carrier -10 to +5 dBm adjustable
Output frequency stability ± 50 Hz
Output impedance 50 W
Output connector BNC
Harmonic and spurious emissions < -60 dBc
In band intermodulation (3 tone CCIR test) < -62 dBc
Video characteristics:
Input connector BNC unbalanced
Input impedance 75 W
Input signal level 1 Vp.p.
Input return loss >30 dB
Differential gain < ± 0.5 %
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 %
Audio Characteristics:
Input connector XLR balanced
Input impedance 600 W
THD (50 KHz peak deviation at 1 KHz) < 0.3 %
S/N (50 KHz peak deviation at 1 KHz) > 65 dB
Deviation from preemphasis curve (20 Hz to 15 KHz) ± 0.5 dB
Operating conditions:
Operating voltage 110/220/240 Vac ±10%, 50/60 Hz single phase
Power Consumption (at maximum power) 27 VA
Operating temperature -5° ÷ +45° C
Humidity 95% max
Mechanicals:
Dimensions (WxHxD) 482 x 45 x 375 mm
Weight 3.2 kg
ITEL S.r.l. TELECOMUNICATIONS AND BROADCASTING SERVICES Via Friuli, 6 - 33074 Fontanafredda (PN) - ITALY Tel. +39 0434 997667 - Fax. +39 0434 997687