It is engi-neered for low power systems or for driving higher power amplifiers. The EX TV Exciter / transmitter consist of plug-in modules, connected together through a mother board, mounted inside a 19" 3HE rack cabinet. It is very versatile through a wide range of modules types that could form several configura-tions. A multifunctional display permits the visualization of all the operating parameters: output power, video level, audio level and operating voltages. All units are provided with remote control interface, RS 232 RF monitor and in-out reference (5 –10 MHz). Synthesized oscillators and broad band amplifiers enable fast and easy frequency changes. The MOSFET techno-logy guarantees high efficiency and an excellent linearity on the entire band.

• Available in the VHF and UHF band

• Latest generation MOS technology

• RF power reduction in case of video input loss

• Synthesized local oscillator with high stability option

• Wide power range capability 10 - 50 W in only one rack

• Frequency agility - All RF amplifier are wideband

• A.G.C. & A.L.C. control

• With external output notch filter

• 3 units rack with plug-in modules

• LCD display to check the most important parameters

• 230V A.C.

This kind of TV transmitter has been especially designed for

low power stations operating in difficult environments.

All models are built in 3 units 19" rack.

Thanks to the frequency agility no RF( filter apart )

adjustment is required to change the channel as all input

and output amplifiers are wideband.

This transmitter can be modified in transposer easily

Precorrection circuit null out the intermodulation products so

that they are in accordance with all the international

standard values.

A analog multimeter placed on the front panel allows the

measure and the control of the most important parameters of the equipment

 

 

 

Power supply

Operating temperature range

Storage temperature range

Maximum relative humidity

Dimensions

120 - 230Vac, 36/48 Vdc

0° C to + 45° C

-10° C to + 70° C

90%non condensing

Std. 19" rack 3HE

 

 

Video input signal level (ex adj)

White level limiter (int. adj.)

2T K Factor

2T chroma.luminance delay

Amplitude /frequency response

Differential gain

Differential phase

Line time distortion

Field time distortion

AM noise (weighted)

PM noise (weighted)

Sync pulse compression

1V p.p (75 Ohm) BNC connector

95%

< 3%

+/- 5цs

+/-0.5 dB (throughout the vision band)

< 5%

< 5°

< 1%

< 0.5%

< 60dB

< 55dB

< 3%

 

 

Audio input signal level (ex. Adj)

Audio pre-emphasis

Audio input impedance (balanced)

Audio frequency response

Harmonic distortion

0 dBm +/- 6 dB Mini Canon connector

50 цs or 75 цs or flat

600 Ohm or 10 KOhm unbalanced

+/-0.5 dB 30Hz÷15KHz

< 0.5%

 

 

Vision Intermediate Freq.

IF Filter

Group delay tolerance

Different specifications

38.9 MHz

SAW acoustic device

± 50 nS

TEM can provide most TV std.

 

 

Output frequency ranges

Output impedance

Output VHF power

Output UHF power

Spurious suppression

Harmonic suppression

Rejection of out-of band IMD

Intermodulation products

Frequency stability

Video and audio carrier

B. III - IV - V

50 Ohm unbalanced

10 and 50W

10 and50W

> 60 dB

> 60 dB

> 60 dB

< -55 dB (with linearity precorrector)

1 ppm (with oven) or external 5/10 MHz

PLL controlled from 10 MHz crystal

 

External interfaces Logic and analog signal outputs, enable

input, RS 232 port

Various

OUTPUT RF PARAMETERS

 

IF PARAMETERS

 

AUDIO PARAMETERS

 

VIDEO PARAMETERS

 

GENERAL