Markers - Promax TV EXPLORER HD User Manual

TV EXPLORER HD / HD
USER'S MANUAL.
Speed of sweep can be modified for terrestrial TV signals. To that end, press
shortly the key [17] MEASUREMENT CONFIGURATION. On the menu "
it will appear the option "
for a quick sweep of the spectrum or "
appear when you're working with terrestrial TV signals, therefore the led "T" on the front
panel must be lighted.
The frequency range displayed (called
using the horizontal cursors
screen frequency range in Spectrum Analyser mode between
MHz 200 MHz 100 MHz
, ,
terrestrial band).
A vertical broken line, called
the tuned frequency.
One of the applications of the
Analyser is in the search for the best orientation and position of the receiving antenna.
This is particularly important in UHF. Because such frequencies are involved, with
wavelengths ranging from 35 cm to 65 cm, if the antenna is shifted only a few
centimetres, the relationship between the picture, chrominance and sound carrier
frequencies change, affecting the quality of the picture in the receiver.
If there is an excess of sound carrier, tearing or 'moiré' may appear on the screen
due to the frequency beats between the sound, chrominance and the picture
frequencies.
If there is a chrominance carrier defect, then the television colour amplifier must
function at maximum gain, which could result in noise appearing all over the television
screen with points of colour that disappear when the saturation control is reduced; in an
extreme case, loss of colour may occur.

5.16.1 Markers

(Only in Spectrum Analyser mode). The central marker indicates the central
frequency or tuning frequency, which can be moved by means of turning the rotary
selector [1] as well in channel as in frequency tuning mode
When monitoring a digital signal spectrum also appears two additional markers at
the sides, which indicate the bandwidth of the digital channel (See previous Figure).
10/2012
LE
Sweep
". Entering in this option you can switch between "
Accurate
" for a slower sweep. This option will only
span
[6] key. Therefore enables selecting the displayed
50 MHz 32 MHz 16 MH
, , ,
marker
, appears on the spectrum display to identify
TV EXPLORER
Configuration
from hereon) can also be altered
Full
(the entire band),
8 MHz
and (the latter one only in
HD / HD
operating as Spectrum
LE
[24].
"
Fast
"
500
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