B&K 1076, Instruction Manual

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OTHER USES FOR THE TELEVISION ANALYST
I.
Displ
ay
ing Your Own Pictures and Patterns on Any TV Receiver
The Television Analyst will transmit any positive and transparent picture
or pattern. The only requirement is tliat the size of the pattern be limited
to 3-by-4-inches. Hence, any pattern drawn with a black crayon on a piece
of clear plastic or acetate the same size as the slides furnished with the instru­
ment can be used in the slide-holder. One blank acetate slide is provided
with the instrument. Be sure crayon side of slide is facing away from CRT
tube. To display black-and-white photos on a TV receiver, merely have a
positive film transparency made and use it in the slide-holder. For best results,
the film transparency should be enlarged or reduced so that the picture area
is about 3-by-4 inches. The full size of the film transparency should be 4%" x
6½" in order to fit properly.
2. Adjusting Linearity and Size
Connect Television Analyst to antenna terminal of receiver under test.
Adjust generator to obtain test pattern of good contrast. Adjust vertical size
and linearity of the TV receiver so that outer circle of the test pattern just
fills the vertical height of the picture tube. Adjust horizontal size and linearity
for as round a circle as possible. It may be necessary to re-adjust receiver
vertical height and linearity after horizontal adjustments. The center of the
test pattern should coincide with the center of the receiver picture tube. Ad­
justments of receiver centering controls will accomplish this.
3. Checking Receiver Resolution
Connect Television Analyst to the receiver under test. Set channel selector
of TV Analyst to an unused channel. Set fine tuning of receiver to obtain a
tJicture displa�· of the best resolution. Adjust VIDEO control of Analyst for
good contrast and shading. By observing the resolution wedges on the test
pattern (See Fig. 25) one can determine the resolution of the receiver under
test. The number of lines of resolution can be read from the test pattern by
observing the point at which the lines in the wedges blend together. An average
receiver should show approximately 250 lines of horizontal resolution, which
is read from the vertical wedge in the test pattern. Any receiver that shows
substantially less than 250 lines might be an indication that the receiver re­
quires realignment. The Television Analyst signal when displayed at video
through a good video monitor will reprodqce a pattern of approximately 400
lines of resolution.
4. Using the Television Analyst for Displ
ay
Purposes
To use the Analyst to display pictures on a number of TV sets, connect its
output to the input of the master antenna amplifier through a suitable match­
ing network. Adjust the CHANNEL SELECTOR control for a good picture on
the display sets, on an unused channel. Set the R.F. ATTENUATOR so that
overloading of the master antenna amplifier does not occur. Set the HORIZON­
TAL control for a stable picture. Set the VIDEO Control for best picture
contrast. After these initial adjustments, only the VIDEO control will have to
be adjusted for the different slides which may be used.
If the harmonics or fundamentals of the VHF oscillator interfere with a
local station in the area, it may be necessary to use a high pass or low pass
absorption filter to eliminate the interference. For example, if the Analyst
is set to a channel below Channel 7 and interference occurs at Channel 7 or
above, connect the output of the TV Analyst to the input of the filter and take
the signal out of the low-band (channels 2 through 6) terminals of the filter.
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