Operation instructions | HKM 40-0x
10
2018-10-05 | Technical improvements, changes in design, printing- and other errors expected.
3.2.2.
DVB-T
Make a pre-selection using the
Country
and
Area
menus.
Depending on the selection made, the country-specific channels are displayed in the Frequency field.
If you select
Others
in the
Country
field, you can set the frequencies freely.
Select an output level of 85 ... 105 dBµV in the
Output level
selection field.
In the
Constellation
selection field, select the desired output modulation (QAM 16/64).
QAM64 allows the highest data transfer rate, but also requires the best network quality.
In the
FEC
selection field, select the FEC factor (1/2, 2/3, 3/4, 5/6 7/8).
By changing the FEC factor, the proportion of the FEC data is changed in relation to the user data. (FEC ½
= low data rate but strong error protection, FEC 7/8 - high data rate but low error protection).
In the
Guard Interval
field, select the protection interval from 1/32, 1/16, 1/8, 1/4. This protection
interval avoids the symbol overflow during DVB-T transmission. The guard interval expresses the ratio of
the transmission pauses to the useful data transmission time. A very long protection interval (eg 1/4) leads
to a very low data rate. When transmitting in a faultless coaxial distribution network, a very small
protection interval is sufficient (1/32).
The
IQ swap
option enables or disables the inverse phase rotation of the IQ signal by exchanging the I
and Q inputs.
Click
Safe Settings
to save your settings.
