Itelco Profile Dolp Nuova Press New
Hi TV Lo TV FM DAB uWave
Specifications General IOT Overview Description

T644K 25 kW UHF TV Transmitter Specifications


RF Characteristics

Frequency range: 470-860 MHz
Power output (peak of sync): 25 kW
Output connection: 4 1/16" EIA flange
Standard: CCIR System M (NTSC)
Cooling System: Water
Type of emission: 5M75C3F, 250KF3E
Visual/aural amplification: common
Visual/aural power ratio: 10/1
Intermodulation distortion (w/ precorrection)£ -60 dB
Sound carrier deviation: ±25 kHz
Harmonic emissions: £ -63 dBc
Spurious emissions: £ -63 dBc
Output power variation blk/wht: £ ±0.5 dB
Output power regulation: £ ±0.5 dB
Frequency stability: £ ±0.5 ppm/yr.
External reference frequency: 5 MHz, 1 Vrms 50W

Visual Characteristics

Video input: Two 75W BNC inputs
with automatic change-over
Video input level: 1.0 Vpp ±6 dB
Video input return loss: £ -34 dB
DC restoration: Clamped to blanking level
without affecting the burst
White level limiter: @ 90% of the modulation depth
without affecting chroma
Visual bandpass (-0.75 to +4.18 MHz): ±0.5 dB
Response verses brightness: ±0.5 dB
Group delay: £ ±35 hsec
Differential gain: £ 5%
Differential phase: £ ± 3°
K factor 2T, 12.5T: £ 2%, £ 5%
Incidental phase (pp sync-white): £ 5
Non linear distortion (10-75% mod.): £ 5%
Signal to noise, low frequency (f £ 1 kHz): ³ 50 dB
Signal to periodic noise (f ³ 10 kHz): ³ 50 dB unweighted
Signal to random noise (f ³ 100 kHz): ³ 56 dB unweighted

Aural Characteristics

Audio input level0 dBm ±10 dB:
Audio input impedance: 600W balanced
Pre-emphasis: 75 ±0.5 msec
Frequency response (40 Hz to 15 kHz): ±0.5 dB
Total harmonic distortion: £ 0.3%
FM signal to noise (rms. value): ³ 60 dB unweighted
AM signal to noise (rms. value): ³ 50 dB unweighted
Synchronous AM @ 25 kHz deviation: ³ 46 dB

Electrical Characteristics

Power requirements 50/60 Hz: 208-220 Vac 3f, or
460-480 Vac 3f-4 wire
Power consumption:
    Black picture
    @ 50% APL
(w/cooling system)
    65 kVA
    48.7 kVA
Efficiency
(Peak sync/ input power @ avg. APL)
82.1%

Return to Homepage