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Broadcast TV Transmitter

Description

The TV Transmitters belonging to the SCAV 15 U series have both a compact size and a pleasant and functional look. How does the SCAV 15 U reach this goal? The motherboard is completely built in SMD technology and mounted by automatic machine to obtain high level of reliability. The filter and amplification stage has been made compact, while keeping good ventilation to limit working temperature, by mounting it all on a single heat sink with a bent steel conveyor. All connectors and controls placed on the front panel are directly connected to the motherboard. The connections between the motherboard and the control board are made through a single 20-pin connector.
All wiring between the motherboard and the other sections of the SCAV 15Uis made with detachable connectors (see clamps for power supply and control of the final stage) to make repair easier. The output connector of the transmitter, the air inlet of the cooling system of the final stage, the power supply box including the main switch and fuses, the telemeasuring connector and the external reference input, if any, have been placed on the back of the SCAV 15U. The user interface has been kept simple and intuitive with the use of an alphanumeric display and only two push-buttons. All the functions have been remote by the Rs232 rear panel connector.

Key Features

• Rack 19"2U (5W-15W)

• 115/230Vac 50/60Hz Power Supply

• Indication ofthe main parameters on LCD display

• Alarm Thresholds for FWD Power, REF Power and Temperature

• Power Supply Input on IEC box with double fuse on the check

• RF Output with N connector on the rear

• Video Input with BNC connector on the front panel

• Audio Input with XLR connector on the front panel

• IF Link with SMB connector on the front panel

• Level adjustment (Video, Audio, SC) with multi-turn trimmer on front panel

Specifications

RF PARAMETERS
Frequency Range	VHF I, VHF III, UHF
Output Power	5W, 15W
Output Power Control	Automatic or Manual (switch-selectable)
I.M.D.	< -60dB (with IF Pre-corrector)
Spurious and Harmonic Level	< -60dB
RF Output Impedance	50 ?
RF Output Connector	N Female
Intermediate Frequency	38.9 or 45.75MHz (on request)
IF Output Level	-15dBm
GENERAL
Power Supply	230 VAC +/- 10%- 15%
Cabinet	Rack 19"-2U (5W-15W)
Weight	9kg (2U)
Ambient Temperature	-10°C to +50°C
Humidity	20% - 90%
Remote Control	Wired and RS232
VIDEO PARAMETERS
Input	75 ?
Nominal Level	1Vpp +/-6dB
Return Loss	>30dB up to 5MHz
DC Recovery	Clamped to back porch
White Limitation	90%... 115% non affecting crominance
Group Delay Pre-corrector	8 Cells
Group Delay	< 50ns (with professional vestigial filter)
Frequency Response	< +/- 0,5dB
Differential Gain	< +/- 5%
Differential Phase	< +/- 5
Luminance Non-Linearity	<5%
S/HUM Ratio	> 45dB weighed
S/N Ratio	> 65dB weighed, > 55dB unweighed
2T Ê Factor	< 1%
ICPM	<3°
IF	32.7MHz ... 45.75MHz
IF Level (on External Link)	-15dBm... -10dBm
AUDIO PARAMETERS
Input	600W/10kW balanced
Nominal Level	2.2Vpp, -lOdB -è +6dB
Frequency Response	<0.5dB
T.H.D.	<0.5%
S/N FM CCIR Ratio	> 60dB weighed > 60dB unweighed (ref. 50kHz)
Pre-emphasis	Flat, 50ms, 75ms
Limitation Circuit	Dnom+1dB
Low-pass Filter	15kHz, 100kHz
Intermodulation	d2 < -60dB, d3 < -60dB
S/N AM Ratio	> 70dB asynchronous > 50dB synchronous (ref. 100%)
IF	30.5MHz ...41.25MHz
IF Level (on External Link)	Adjustable
	LOCAL OSCILLATOR
Frequency	500MHz... 900MHz splitbetweenband I, III, IV/V
Offset	+/- 32kHz max.
Frequency Stability	+/- 2.5ppm (0.05ppm with HIGH STABILITY option)
External Reference	5MHz
S/N FM CCIR Ratio	> 60dB weighed (ref. 35kHz)