Samsung LE27S73BD Service Manual page 180

13 Circuit Descriptions
4-11 Reference Frequency
The X-tal for the RF block's PLL :
4-12 Phase Noise (step frequency 166.67kHz for digital)
@ 1kHz : -84dBc/Hz typ. -75dBc/Hz max.
@ 10kHz : -90dBc/Hz typ. -80dBc/Hz max.
4-13 Control Data Bus :
4-14 Control Data Format :
4-15 Image PAL Interference Protection Ratio
: -49dB typ. -46dB min (at 2K, 8K mode) Note1.
4-16 Adjacent PAL Interference Protection Ratio. (N
: -38dB typ. -35dB min (at 2K, 8K mode) Note1.
4-17 Co-Channel PAL Interference Ratio.
: +1dB typ. +4dB min (at 2K, 8K mode) Note1.
Note1 :
Desire input signal condition
a : Modulation - 64QAM
b : Guard Interval - 1/32
c : Puncture Rate - 2/3
Undesired input signal condition :
PAL : Video 75% color bars
FM sound : 1kHz tone (P/S : 13dB,
Adjacent & Image channel PAL interference test procedure
a. Turn DVB-T source off ; adjust PAL PSP level to -25dBm
b. Turn PAL off ; turn DVB-T on
c. Adjust DVB-T to -25dBm
d. Turn PAL on and increase step PAL level to see the pixelation on the screen
e. Note protection ratio as the difference value between DVB-Tand PAL's level
Co-Channel PAL interference test procedure
a. Turn PAL source off ; adjust DVB-T level to -50dBm
b. Turn DVB-T off ; turn PAL on
c. Adjust PAL to -50dBm
d. Turn DVB-T on and increase step attenuator in PAL channel until QEF.
4-18 Input Carrier to Noise (Additive White Gaussian Noise, QEF. Condition)
: 17.4dB typ. 18.4dB max. (64QAM, 2K,8K Mode, Code rate:2/3, input level:-50dBm)
: 22.5dB typ. 23.5dB max. (64QAM, 2K,8K Mode, Code rate:7/8, input level:-50dBm)
4-19 Sensitivity (QEF. Condition)
: -80dBm typ. -77dBm max.(64QAM, 2K,8K Mode, Code rate:2/3,Guard Interval 1/32)
: -73dBm typ. -70dBm max.(64QAM, 2K,8K Mode, Code rate:7/8,Guard Interval 1/32)
4-20 Multipath channel Interference (64QAM, 2K, 2/3code rate, 1/32G.I)
13-6
4MHz
I2C
refer 5 section
1 channel)
50kHz deviation, freq. P/S : 6.0MHz)