The GV-698 video generator is a multi-standard, multi-system unit
with advanced functions. Its modular structure makes it highly versatile,
since it is possible to increase the applications of the instrument by
adding modules.
    The generator is particularly suitable for those industrial sectors
that require high-quality pictures such as adjustment and analysis
lines, production studios, technical assistance services, etc. Because
it is easy to operate, it is indispensable in the training of video
technicians.

    The video is equipped with 32 pattern charts to analyze the picture
visually or with an oscilloscope. For geometric adjustments, the electronic
circle can be inserted in all the charts.

    To detect defects in the tuning circuits and IF amplifier stages, the
GV-698 has a complete synthesized radio-frequency modulator.

MULTI-STANDARD

    Colour TV signals differ from country to country. The most common
systems are PAL, SECAM and NTSC. Furthermore, there are various
standards within each system which differ regarding the sound carrier
frequency and other points. The GV-698 operates in accord with the
CCIR recommendations for the PAL, SECAM and NTSC systems,
incorporating up to nine standards in a single instrument. Therefore, it
is particularly appropriate in circumstances where various systems and
standards are in use, a situation that is becoming more and more
common due to the increasing popularity of satellite TV.

FREQUENCY SYNTHESIS

    In the GV-698, the frequency synthesis technique is used, which
ensures high stability and accuracy. Frequency is indicated on the
display with a five-digit resolution. The tuning can be done by channel
or by fine adjustment in the 37 to 865 MHz range, with a 50 kHz
resolution.

DISPLAY

    The 16-character display has five readings, four of them
simultaneous: the frequency, with a five-digit indication, the program,
the colour chart, the TV system and sound standard, and the channel
indication.


Y - C (S-VHS) OUTPUT

    The GV-698 can produce the separate Y and C signals (luminance
and chrominance) that are used in the S-VHS system. The S-VHS
system is gaining in popularity as a high-quality video standard and it is
incorporated in a growing number of television sets and video recorders.
These signals are available in a special 4-contact connector, which is
identical to that found in the videos equipped with S-VHS.

LOGOTYPE GENERATOR

    The GV-698 has a three-logotype generator with a 64-line resolution
(1040 points/54 ps). As an option, these logotypes can be programmed
according to the specifications of the customer.

STEREO SOUND

    The demand for better quality sound in television systems has
resulted in the appearance of two stereo/dual sound standards: NICAM
Digital) and ZWEITON. The GV-698 enables the analysis and perfecting
of sets equipped with these sound systems, whose introduction is
increasing.

    The GV-698 is controlled by a microprocessor and, with its wide
16-character display and incorporated encoder, selection is simple and
easy. The microprocessor controls such functions as the selection and
display of the RF output by channel or by frequency, the selection of the
colour system and sound standard, the selection of the output chart and
the storage of 32 programs.

    For a superior analysis of the video and sound signal, there are
push-buttons located on the front panel for canceling or including
certain basic functions, such as:

 - Cancellation of the colour subcarrier, of the burst, of the sound
   subcarrier, of L and R sound, and of the TELETEXT and VPS signal
 - Inclusion of the electronic circle
 - Option to eliminate the interlace in the video signal
 - Selection of stereo or dual sound
 - Selection of the information to transmit in the VPS signal



EXTERNAL CONNECTIONS

    There is an adjustable composite video output and an RF output
with an attenuator of up to 50 dB.

    In addition, numerous auxiliary inputs and outputs increase the
possibilities of the instrument considerably. These supplementary
connectors are located on the rear panel.

 - Y-C (S-VHS) output
 - R, G and B (or G plus synchronisms) outputs
 - Composite synchronism output
 - Synchronism output for an oscilloscope
 - L and R sound input
 - EUROCONNECTOR, with composite video, R, G, B and
   sound outputs, and inputs for L and R sound and video (external
   signal modulation).

Colour bars signal viewed on an oscilloscope

VTR SIGNAL

    This signal is used to check the functioning of video tape
recorders, particularly the functions of image hold, stepped image,
head position, etc.

OPTIONS

    Some of the above-mentioned features are optional. For more
detailed information about versions and options, see the Options and
Versions sections in the specifications table.

TEST SIGNALS

    The GV-698 model generates 32 test signalas, notable among which are two
monoscope-type charts. The test patterns include monoscope, colour bars,
various combination of test signals, red, green, and blue screeens, R-G-B
bars , grey range, multi-burst, high voltage test, grid, antipal and 50% Y,
antipal with U/V axis, chrominance/luminance delay test, dots, and other,
which make the instrument ideal for multiple applications.





Monoscope




Combination




EIA




Colour bars






Red screen




Green screen




Blue screen




Antipal and 50 % Y






Multiburst




Black screen




Grid




Dots



TELETEXT

During rercent yers, there has been a growing acceptance of TELETEXT on the
pat of users, and the majority of modern televisions incorporate it. With the
GV-698, it is possible to generate 8 pages of teletext in two languages, wich
can be selected from the television set, with different combinations of graphics
and text in levels 1.0 and 1.5 as well as the FLOF or FASTEXT function. Therefore
it is possible to analyze all the decoding function and guarantee the proper
operation of the equipment being tasted.






Teletext I




Teletext II




Teletext III




VPS SIGNAL

The VPS (Video Program Service) is a system by witch the televison channels
send a signal before each programm taht activates the users' videos if they
are equipped with this feature. This eliminates the problems cuased by the
changes in the programmnig to be recorded. With the GV-698 it is possible
to generate VPS to test the video recorders that have this feature.