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Terrestrial Constellation
The HD-STM can also display a terrestrial constellation diagram.
Note: The constellation will only operate correctly when locked on to a QAM digital carrier.
+Crystal Palace Ch. 25
Press ◄ or ► for next channel.
01/10/2010 10:30 AM
The example above shows the constellation diagram of a DVB-T 16 QAM service. On the right hand side of the
display the receive parameters are also shown.
In the constellation mode it is also possible to save a screen shot to your SD card for the purpose of producing
reports and records of installation results.
The constellation diagram can be a very useful tool for fault finding and diagnosis, as it can be used to find a
point where noise has been introduced into a system where it may not be present elsewhere.
Data capture
Save screen shot and
measurement data to
SD card.
File name: TC00001.bmp
Press OK to save to SD card.
01/10/2010 10:30 AM
Ch. 25
TERR
Menu
471 MHz
DVB-T
16 QAM
23 dB C/N
Q 3.02E-3
V 1.30E-6
SD Card
Back
Main
Menu
Back
Select TERR Menu to select your transmitter.
Pressing SD Card will enable the user to grab a screen
shot of the spectrum with details of the carrier if a locked
condition is possible as a .bmp file.
Pressing Back will also return you back
to the Terrestrial measuring Mode.
If you choose to save the constellation display to
the SD card the whole screen is captured as a
.bmp file. Once the image has been saved you
will be returned to the constellation display.
Terrestrial constellation data capture is stored
as incremental files prefixed TC and then the
file number. The image is also time and date
stamped.
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