Alcad DM-102 Manuale utente

Technote10: Setting up DM-102 COFDM Modulators with PS-011

DM-102 is a fully agile Digital Modulator which is designed to convert 2 AV

signals into a digital modulated channel.

IMPORTANT: Layout of the modules must be as shown above. Power Supply (FA-312) must

be located on the far left hand side and launch amplifier (PA-720) must be the next module in

the chain. Please look at the layout above. A limit of 6 DM-102 modules can be powered by

one FA-312. If FA-310 is being used only 3 modules is the limit due to power consumption.

AIM PROGRAMMER TO IR SENSOR LOCATED ON EACH DIGITAL

MODULATOR WHEN PROGRAMMING

Programming of Modules

Ensure the following prior to programming:

•It is necessary to connect all the modules to the support frame SP-226 (code 9120130)

for the system to function.

•It is also recommended that you make the earth connection to the building using a cable

with a section of at least 4 mm.

•Ensure that you have the Alcad programmer PS-011 with firmware version 1.11 or

later.

•Power supply/Control cable must be plugged into each module. DO NOT ADD OR

REMOVE modules without disconnecting mains supply power from wall outlet. Always

disconnect the equipment, and then reconnect it to the mains supply. Failure to do so

can cause equipment to fail.

Launch Amplifier

Power Supply

IR Sensors

OPERATION OF PS-011 PROGRAMMER

1.0 Programming of the Modulator

To program the Digital Modulator, place the programming switch in the ON (upward) position

which can be seen from picture below. When you turn the switch in the “ON” position the

programming indicator will light up. While the programming indicator remains lit, the modulator

is ready to receive data from the PS programmer. When the modulator has been programmed,

programming mode should be deactivated by placing the switch in the “OFF” position. The

programming indicator light will go out.

To start programming the DM-102 module you desire to programme please slide the

programming indicator switch to the ON position.

Press the On/Off button on the PS-011 programmer to turn on programmer.

You should then see the window below which gives you the following options:

Ensure that “Select Series” is highlighted then press the button which will take you to the

window on the next page. Using the arrow down scroll down to “DM A/V to DVB-T

modulator”

Once you have scrolled the selection bar to the modulator press the button to take you to

another window which can be seen below

Press the button to take you to “Output” configuration screen which can be viewed below

The following output settings options are as follows:

Standard has two options:

- DVB-T is an abbreviation for Digital Video Broadcasting-Terrestrial. Select this option for

Television reticulation.

- DVB-H is an abbreviation for Digital Video Broadcast-Handheld. Select this option for

Mobile Handsets.

Once you have selected the “Standard” option press transmit button on the programmer

to send the change through to module.

Program by has two options:

- Frequency meaning that the output of the modulator is done so by the frequency

entered e.g. 655.50.

- Channel meaning that the output of the modulator is done so by channel number.

You should always select to Program by “FREQUENCY” as this stops confusion of any changes

made to country channel plans.

Once you have selected the Frequency option press the transmit button to send the changes

through to the modulator. The next two options ‘Channel table’ and ‘Channel’ will be locked and not

applicable if the setting ‘Program by Frequency’ has been selected on the last option as per ALCAD

recommendation.

Frequency is the selection box where you need to enter the output digital RF frequency you desire the

modulator to output the V/A feeds to. If you are unsure of the frequencies please note the Australian

digital Channel/ Frequency plan below.

DIGITAL FREQUENCIES FOR AUSTRALIA ARE HIGHLIGHTED IN YELLOW

Press transmit button on the programmer to send the change through to module.

Attenuation is the dropdown box that allows you to adjust the power level output of the

modulator.

Press transmit button on the programmer to send the change through to module.

Offset is the dropdown box that gives you the option to add or subtract either 0.166 or

0.125MHz of the output digital RF frequency. Look at table to give you the decimal

conversion.

Fraction

Offset

Decimal

Offsets

+ 1 / 6

+0.166

- 1 /6

-0.166

+ 1 / 8

+0.125

-1 / 8

- 0.125

Bandwidth in Australia must ‘ALWAYS’ be set to 7 MHz .

Press transmit button on the programmer to send the change through to module.

Mode can be set to either 2K or 8K. DVB-T offers a choice of two options for the number of

carriers, each with the same fundamental data capacity. In "2K" mode, 1705 carriers are used

to carry symbols with a useful duration of 224m s, whereas in "8K" mode there are 6817

carriers with a useful symbol duration of 896m s. The reason for having two modes is to allow

a trade-off to be made between receiver complexity and the ability to withstand long echoes.

Press transmit button on the programmer to send the change through to module.

Modulation has 3 modulation options QPSK, 16QAM, 64QAM. There is a balance between the

amount rate at which data can be transmitted and the signal to noise ratio that can be

tolerated. The lower order modulation formats like QPSK do not transmit data as fast as the

higher modulation formats such as 64QAM, but they can be received when signal strengths

are lower.

Press transmit button on the programmer to send the change through to module.

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