Atec VITS100 User Manual

Instruction Manual

VITS100
NTSC VITS Inserter

070-8333-02

Warning

The servicing instructions are for use by qualified
personnel only. To avoid personal injury, do not
perform any servicing unless you are qualified to
do so. Refer to all safety summaries prior to
performing service.

Specifications

This section contains tables that list the specifications for the VITS100 NTSC
VITS Inserter. All specifications are guaranteed unless noted “typical.”

The performance limits in this specification are valid with these conditions:
H The VITS inserter must have been calibrated/adjusted at an ambient

temperature between +20

H The VITS inserter must be in an environment with temperature, altitude,

humidity, and vibration within the operating limits described in these
specifications.

H The VITS inserter must have had a warm-up period of at least 20 minutes.

Specification Tables

T able 3–1: Program channel characteristics

Characteristic Information

_ C and +30_ C.

Gain Unity ± 1%
Frequency Response ±1% to 5.5 MHz

±3% to 10 MHz
Chrominance-to-Luminance Gain ±0.5%
Chrominance-to-Luminance Delay ≤5 ns
Diff Phase ≤0.2°
Diff Gain ≤0.2%
Line Tilt ≤0.5%
DC Output Level 0 V ±10 mV
DC Matching of Inserted Test Signal to

Program Signal
Phase Match (Relay Bypass Path to Signal

Processing Path)
Hum Rejection 50 dB (Measured right after burst)
Keyboard (No Noise) Too small to measure on VM700A
Insertion Transients ≤10 mV (Measured on Tektronix 1780R. Typically <5 mV)
Input Impedance 75 W
Return Loss 36 dB to 5 MHz (Program In, Program Out, and Monitor Out)

±3 mV

±1° at F

SC

VITS100 NTSC VITS Inserter Instruction Manual

3–1

Specifications

T able 3–1: Program channel characteristics (Cont.)

Characteristic Information

Phase Matching of Inserted Test Signal to
Program Video

Pulse to Bar Ratio 100%±0.5% (Typically within ±0.25%)
Signal to Noise Ratio >70 dB (Unweighted Filter at 5 MHz. Measured 91 dB on VM700A, relative to reference)

±1° (Program Sync and Burst Normal Level)

T able 3–2: Test Signal and Black Burst general characteristics

Characteristic Information

Frequency Response ±1% to 5 MHz

±5% to 10 MHz

Luminance Amplitude Accuracy ±1%
Chrominance-to-Luminance Gain ±0.5%
Chrominance-to-Luminance Delay ≤5 ns
Diff Phase ≤0.3°
Diff Gain ≤0.3%
Line Tilt ±0.5%
Output Impedance 75 W
Signal to Noise Ratio >78 dB (Measured on a VM700A with an unweighted 5 MHz lowpass filter.)
Spurious Signals (5 MHz 50 MHz)
Pulse to Bar Ratio 100% ±0.5%
K Factor (K2T) 0.3% (Typically 0.2%)
Crosstalk ≥60 dB down
DC Offset 0 V DC ±10 mV
SCH Phase Accuracy 0 ±5° (< ±2.5° typical)
Luminance Rise Time 140 ns ±20 ns
Chrominance Rise Time 300 ns ±35 ns

>55 dB down

T able 3–3: Black and Gray Test Signal characteristics

Signal Information

0% Black 0 IRE Luminance with sync and burst; see Figure 3–1.

7.5% Black 7.5 IRE Luminance with sync and burst; see Figure 3–2.
50% Gray 50 IRE Luminance with sync and burst; see Figure 3–3.

3–2

VITS100 NTSC VITS Inserter Instruction Manual

T able 3–4: FCC Composite characteristics

Characteristic Information

Timing See Figure 3–5
Modulated 5-step Staircase
Luminance

Amplitude 80.4 IRE ±0.7 IRE
Riser Amplitude 1/5 of 5-step amplitude ±0.5%
Rise Time 250 ns ±25 ns

Chrominance

Phase Same as burst ±0.3°
Envelope Risetime 375 ns ±37.5 ns

2T Pulse

Pulse-to-Bar Ratio 100% ±0.5%
Half Amplitude Duration (HAD) 250 ns ±25 ns
Ringing 1.0 IRE or less

Modulated SIN2 Pulse

Pulse-to-Bar Peak Amplitude 100%
Half Amplitude Duration 1.563 ms ±150 ns
Phase 60.8° ±1°

Bar

Amplitude 100 IRE ±1 IRE
Rise Time 250 ns ±25 ns

Specifications

VITS100 NTSC VITS Inserter Instruction Manual

3–3

Specifications

T able 3–5: FCC Color Bars characteristics

Characteristic Information

Timing See Figure 3–4
Luminance Rise Time 250 ns ±25 ns
Bar Characteristics: White Y ellow Cyan Green Magenta Red Blue Black

Luminance Amplitude (mV p-p)
Subcarrier Amplitude (mV p-p)
Subcarrier Phase (degrees)

714.3

0.0

0.0

494.3

444.2

167.1

400.7

630.1

283.4

345.7

588.5

240.8

256.0

588.5

60.8

202.1

630.1

103.4

107.8

444.2

347.1

T able 3–6: Multiburst characteristics

Characteristic Information

Timing See Figure 3–6
White Reference Bar Amplitude 100 IRE
Packet Amplitudes 60 IRE p-p
Pedestal 40 IRE
Burst Frequencies 500 kHz, 1.25 MHz, 2.0 MHz, 3.0MHz, 3.58 MHz, 4.1 MHz
Packet Rise Time

500 kHz 140 ns typical (sin2 shaped packets)
Other Packets 400 ns typical (sin2 shaped packets)

53.5

0.0

0.0

T able 3–7: Multipulse characteristics

Characteristic Information

Timing See Figure 3–7
Amplitudes 80 IRE
Frequencies 1.0 MHz, 2.0 MHz, 3.0 MHz, 3.58 MHz, and 4.2 MHz

3–4

VITS100 NTSC VITS Inserter Instruction Manual

T able 3–8: NTC7 Combination characteristics

Characteristic Information

Timing See Figure 3–8
White Reference Bar

Amplitude 100 IRE ±0.7 IRE
Rise Time 250 ns ±25 ns

Multiburst Packets

Amplitude 50 IRE ±0.5 IRE p-p
Average Level 50 IRE ±0.5 IRE
Frequencies 500 kHz, 1.0 MHz, 2.0 MHz, 3.0 MHz, 3.58 MHz, 4.2 MHz
Packet Rise Time

500 kHz and 1.0 MHz 140 ns typical (sin2 shaped packets)
Other Frequencies 400 ns typical (sin2 shaped packets)

Modulated Pedestal

Pedestal

Amplitude 50 IRE ±0.5 IRE
Rise Time 250 ns ±25 ns

Chrominance

Amplitude

20 IRE 20.01 IRE ±0.5 IRE
40 IRE 40.02 IRE ±0.5 IRE

80 IRE 80.04 IRE± .5 IRE
Phase relative to burst 90° ±0.5°
Rise Time 400 ns ±40 ns

Specifications

VITS100 NTSC VITS Inserter Instruction Manual

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