View source for STMicroelectronics STV0900A 16APSK 32APSK

Advanced version of [[DVB-S2]] [[Demodulator|demodulator]] STV0900A produced by [[STMicroelectronics]]. 16APSK/32APSK supports.

== 16APSK/32APSK on [[NetUP_Dual_DVB_S2_CI|NetUP Dual DVB-S2 CI]] card ==

16APSK 2/3 (TS bit rate is 70Mbps) works fine with the following experimental change set - http://udev.netup.ru/cgi-bin/hgwebdir.cgi/v4l-dvb-aospan-stv0900aac 
16APSK constellation on NetUP Dual DVB-S2 CI card: 

[[Image:16apsk_3-4_cn31db_tuner-gain6db-netup_constellation.jpg|16APSK constellation on NetUP Dual DVB-S2 CI card]]

32APSK 9/10 (TS bit rate is 119 Mbps) was received successfully but transferring this high bit rate to cx23885 caused loss of TS packets. We are working on this ... 
32APSK constellation on NetUP Dual DVB-S2 CI card: 

[[Image:32apsk_9-10_cn31db_tuner-gain6db-netup_constellation.jpg|32APSK constellation on NetUP Dual DVB-S2 CI card]]


Remarks:

1. 16APSK/32APSK modulations were tested with locally connected modulator ( 2m of coax cable ). Signal quality is 22 dB and higher. In real installations signal quality should be lower and may cause broken TS reception.

2. STV0900 demodulator should be marked as "STV0900A". "STV0900B" doesn't support 16APSK/32APSK.

3. STV0900 switched to single mode when receiving 16APSK or 32APSK. Second channel doesn't work in this case.