amdc
Junior Member level 3
LO and QAM64
Hello all. I'm trying to make the receiver to convert QAM 64 from 6 Ghz to IF=0.8 Ghz. I have bad BER=5*10^-6 which constantly sweeps. I don't know what to do. When i apply IF signal to cable receiver and TV set i see the fade of picture sometimes. SNR is more than 35 dB. May be i should change my LO. LO consists of frequency Synthesizer ADF4156 with VCO HMC431lp4. What bandwidth of loop filter should i choose? 15kHz or 30 khz to improve Ber? I simulated my LO in ADIsimPLL from Analog device. Project is attached below.
Hello all. I'm trying to make the receiver to convert QAM 64 from 6 Ghz to IF=0.8 Ghz. I have bad BER=5*10^-6 which constantly sweeps. I don't know what to do. When i apply IF signal to cable receiver and TV set i see the fade of picture sometimes. SNR is more than 35 dB. May be i should change my LO. LO consists of frequency Synthesizer ADF4156 with VCO HMC431lp4. What bandwidth of loop filter should i choose? 15kHz or 30 khz to improve Ber? I simulated my LO in ADIsimPLL from Analog device. Project is attached below.