EnoSat
Specialist Contributor
- My Satellite Setup
- TBS-5927/5925/5220 , Dreambox , Edision , Mutant , Octagon , Uclan
- My Location
- Slovakia
DRO (dielectric resonator oscillator) LNB types have very poor frequency stability and are suitable only for the reception of wide bandwidth carriers, such as a 27 Msps satellite TV or VSAT outlink carrier, where the receiver tuning circuits can lock onto the carrier despite frequency errors of up to +/-500 kHz or +/- 2 MHz and second's delay (or more) locking up is of no consequence.
PLL (phase lock loop) LNBs use an internal 10 MHz crystal oscillator (which has high stability) and a phase locked oscillator at say 10 GHz. Frequency accuracy is very good (say +/-25 kHz) and phase noise is low. Use this type for the reception of low symbol rate carriers and higher order modulation carrier like 8PSK and 16QAM.
source: satsig.net
PLL (phase lock loop) LNBs use an internal 10 MHz crystal oscillator (which has high stability) and a phase locked oscillator at say 10 GHz. Frequency accuracy is very good (say +/-25 kHz) and phase noise is low. Use this type for the reception of low symbol rate carriers and higher order modulation carrier like 8PSK and 16QAM.
source: satsig.net