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VT5F9MN0006

RF Modulator

Sharp Electronics 

VT5F9MN0006/07

RF Modulator

SPECIFICATIONS

General Description

• U.S. standard transmission system

• NTCS color system

• Output channel 3, 4

• Output impedance 75 Ω, unbalanced

• Power source 5 (VDC) +B (MOD)

Test Condition

• Power source 5 ±0.1 (VDC) +B (MOD)

– Ripple 30 mVp-p MAX.

• Unit setting conditions

– Video: Apply 75% modulated color bar signal 1

Vp-p and set modulation factor and V/S ratio to

specified values. For modulation factor setting,

WHITE signal shall be 1 Vp-p V/S = 7/3,

APL = 50%.

– Audio: Add 1.24 Vp-p

• Ambient Conditions

– Temperature 25°C ±3

– Humidity 65% ±5 RH

– If judgment is not in doubt, standard tempera-

ture may be considered as 15° to 30°C and hu-

midity 45% to 85% RH.

Electrical Performance (RF MOD Portion)

• Video Characteristics

– Input impedance 1 kΩ ±30%, unbalanced

– Measure at 0 to 4.2 MHz

– Input signal level 1 Vp-p synchronous (–)

– When load of 82 Ω is applied

– Modulation factor 77 ±7%

– When load of 82 Ω is applied

– V/S Ratio

– 7 +0.25, -0. Input: Staircase wave 1 Vp-p syn-

chronous (–)

– 3 +0, -0.25. V/S = 7/3

– Amplitude frequency characteristics +2 dB, -3

(MAX.)

– Using 1 MHz as a standard in the 0 to 4.2 MHz

range, measure at RF output using multiburst

or sweep generator. Spectrum analyzer band

is 300 kHz.

– Differential gain 10% (MAX.)

– Superimposed 3.58 MHz sine wave level shall

be 20% of staircase wave level, measured in a

modulation factor range of 65% to 75% and an

APL range of 10% to 90%. However, differential

gain of demodulator unit shall require correction.

– Differential phase 10° (MAX.)

– Superimposed 3.58 MHz sine wave level shall

be 20% of staircase wave level, measured in a

modulation factor range of 65% to 75% and an

APL range of 10% to 90%. However, differential

gain of demodulator unit shall require correction.

– Change in modulation factor to APL ±5% (MAX.)

– Within an APL range of 10% to 90% with APL

50% as referenced.

– S/N ratio 45 dB (p-p/rms MIN.)

– Measure with standard demodulator output.

• Audio system characteristics

– Input impedance 30 kΩ, unbalanced (MIN.)

– Measure at 0.1 to 10 kHz

– Input signal level 1.24 Vp-p

– Amplitude frequency characteristics +2 dB, -3 dB

– Using 1 kHz as a standard in the 100 Hz to

10 kHz range, measure deviation between ref-

erence.

– Modulation factor 90 ±20%

– 100% = ±25 kHz (±25 kHz ±5 kHz)

– Distortion rate 3% (MAX.)

– S/N ratio 45 dB (MIN.), includes buzz

• Output system characteristics.

– Video carrier frequency ±100 kHz (MAX.)

– For test conditions, temperature shall be 25°C,

and humidity 65% RH.

– Audio frequency 4,500 kHz ±7 (MAX.)

– For test conditions, temperature shall be 25°C,

and humidity 65% RH.

– Video output level 66 dBµ ±3 (MAX.)

– p-p level (AT modulation): 75 Ω load

– Audio output level difference (P/S ratio) 16 dB +4,

-3 (MAX.)

– Difference between video output level and au-

dio output level (audio non-modulation)

– Output terminal spurious

– Specific frequency 16 dB +4, -3 (MAX.)

fp – 4.5 MHz

– Other frequencies 30 dB (MIN.). Measure as

per FCC regulations: 0 to 1,000 MHz, exclud-

ing frequency in preceding remark.

– Spurious radiation within the band 60 dB (MIN.)

– Between fp and fs

– Chroma beat (920 kHz) 50 dB (MIN.)

– Apply 3.58 MHz 0.3 Vp-p sine wave to video in-

put and measure using spectrum analyzer.

– Output VSWR 3 (MAX.)

– Worst point in the band at 75 Ω termination.

2

RF Data Sheet

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