Adtec RD-60 User Manual page 14

Acquisition Acquisition Range is defined as the range of
Range frequencies that the tuner will scan in order to
achieve carrier synchronization. Allows the
operator to select the range of frequencies that
the RF tuner will sweep through to acquire the
carrier. e.g. If the desired carrier is at 1.080GHz
and the Acquisition Range is set to 5MHz, the RF
tuner will sweep through 1.080GHz ± 2.5MHz to
acquire the carrier. Units are in MHz.
Actual acquisition range available is
note:
symbol rate dependent for advanced and
premium demods. If symbol rate < 5MBaud,
maximum range is 1.5 * symbol rate. If
symbol rate > 5Mbaud, maximum range is
7.5MHz.
Rolloff The rolloff selection will determine the shape of
the input filter. The occupied bandwidth of the
modulated signal is the symbol rate multiplied by
(1+α) where alpha (α) is the rolloff factor (%).
By using a lower alpha, carriers can be spaced
closer together on a given transponder or an
increased symbol rate can be realized for a given
bandwidth.
note: 5%, 10%, and 15% rolloff is only
applicable in DVB-S2 with premium
demodulators. AUTO is only available in DVB-S.
If required for demodulators, contact support for
firmware upgrade.
Pilot DVB-S2 allows the option of inserting bursts of
pilot tones that are very robust and prevents the
carrier recovery system from failing prematurely.
However, when pilots are enabled, the total data
rate throughput is reduced by approximately
3.0%.
note: Pilot is not applicable in DVB-S or AUTO-
CCM modes.
FEC Frame When operating in DVB-S2, the Frame Type
Type* options are either Normal or Short. The Normal
64,800-bit FEC frame provides better protection
but introduces more latency compared to the
Short 16,200-bit FEC frame. Therefore, the Short
FEC frame type should be selected in
applications where latency is critical and the
longer frame type should be used to optimize
protection.
note: FEC Frame type is not applicable in DVB-S
or AUTO-CCM modes.
0 - 7.5MHz
5%
10%
15%
20%
25%
35%
AUTO*
On
Off
N/A
Short
Normal
N/A