TANDBERG TT1260 Reference Manual page 129

Parameter
Frequency
Tuning range
Tuning step
Carrier frequency search range
Receive spectrum sense
Power
Input power level per carrier
Total L-band input power
Oscillator power at the L-band input
Modulation
Signal type
Convolutional FEC rates
Symbol rate range
Symbol rate step
Symbol rate lock range
Bitrate R188 range
C/N ratio
Miscellaneous
Phase noise tolerance
LNB power and control
Table B.10 shows the C/N requirements to ensure error free demodulation for all supported
FEC rates. Table B.11 shows the minimum and maximum possible bitrates for all FEC rates.
Table B.27: QPSK L-band Satellite Input — C/N Ratio
Convolutional FEC Rate
1/2
2/3
3/4
5/6
7/8
C/N ratio is referred to user bitrate Ru188. See EN 300 421 specification. For more detailed
specification information and advice on performance in specific applications, please contact
TANDBERG Television Customer Services.
14
The displayed frequency is either L-band or SHF dependent on the LNB frequency and the SHF carrier frequency set in the
satellite receiver input menu.
15
EN 300 421: Digital broadcasting systems for television, sound and data services; Framing structure, channel coding and
modulation for 11/12 GHz satellite services.
16
These specifications apply in the presence of thermal noise at the threshold Eb/N
Reference Guide: TT1260 Contribution Receiver
ST.RE.E10100.3
Specification
Fc = 950 to 2150 MHz
14
100 kHz
0 to ± 5 MHz
Normal and inverted
-65 to –25 dBm
< -10 dBm
< -63 dBm, F = Fc and Fc/2
QPSK per EN 300 421
1/2, 2/3, 3/4, 5/6, 7/8
Rs = 1.0 to 45.0 MSymbol/s
1 Symbol/s
± 120 ppm
See Table B.11 for QPSK bitrate R188 limits
See Table B.10
SSB phase-noise power spectral density < K + 8.5*Log(Rs)
at δF = 10 kHz
Phase noise power spectral density of the form C – 20*Log(δF)
δF = Frequency offset from carrier
Rs = Symbol-rate (Msymbol/s)
Convolutional FEC rate
1/2
2/3
3/4, 5/6, 7/8
See Table B.12
C/N Ratio (dB) in IF Loop for correct MPEG-2 system
operation
4.5
5.0
5.5
6.0
6.4
15
K
-77
-74
-71
ratio given in Table B.10.
0
Technical Specification
16 (typical)
Page B-19