GSS HDTV 1000 T, Руководство по сборке

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- 36 - HDTV 1000 T / HDTV 1001 T
Setting the transmission parameters
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interval.
Bx 4A
8k C7/8 COFDM-MODE
G1/32
Transmission mode
In this menu item you set the quantity of carriers:
2k mode: 1512 carrier for user data (total 1705 carriers)
4k mode: 3024 carrier for user data (total 3410 carriers)
8k mode: 6048 carrier for user data (total 6817 carriers)
—> The standard modes for DVB-T are 2k and 8k.
Ê UÊ 1Ș}ÊÌ iÊ buttons set the transmission mode required (“ 2k ” oʺ 8k ”).
Code rate
During a transmission data can be lost or changed. To recover this data redun-
dancy is added to the signal to be transmitted (forward error correction). The
factor of the quantity of redundancy contained in the bits transmitted is called
code rate.
Using the setting “ C7/8 ” you can get the highest output data rate at lowest redun-
dancy.
Ê U Use the buttons to place the cursor under “ C… ”.
Ê UÊ -iÌÊÌ iÊVœ`iÊÀ>ÌiÊÀiµÕˆÀi`ÊÕȘ}ÊÌ iÊ buttons (“ C1/2 »]ʺ C2/3 »]ʺ C3/4 »]Ê
“ C5/6 »]ʺ C7/8 ”).
Guard interval
In this menu item you set the relation of the duration of the user symbols to the
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“ G1/4 ” causes a low output data rate. For cable networks the setting “ G1/32 ”
is adequate.
Ê U Use the buttons to place the cursor under “ G… ”.
Ê UÊ -iÌÊÌ iÊ}Õ>À`ʈ˜ÌiÀÛ>ÊÀiµÕˆÀi`ÊÕȘ}ÊÌ iÊ buttons (“ G1/4 »]ʺ G1/8 »]Ê
“ G1/16 »]ʺ G1/32 ”).
Ê UÊ *ÀiÃÃÊÌ iÊ button.
—> The “Setting the transmitter identification” – “ COFDM TPS ” menu is acti-
vated.