[Ground-station] DVB-S2 or -X bandwidth ?

[Ron Economos]

It used to be that demodulator chips didn't go below 1 Msym/s, but more 
recent chips do. On QO-100, folks are using 500 and 333 ksym/s and even 
lower. The STiD135 that I posted about previously is specified down to 
100 ksym/s.

The actual bandwidth of a DVB-S2 signal is the symbol rate times the 
roll-off factor + 1. The typical roll-off used is 0.2, so a 1 Msym/s 
signal is 1.2 MHz wide. A 1 MHz bandwidth would require a 833 ksym/s signal.

Ron W6RZ

On 8/24/19 05:49, KC9SGV via Ground-Station wrote:
> Hi All,
> Is 1 MHz wide enough for DVB-S2 transmissions ?
> I cannot attach a picture here, but look on page 17 of this old TAPR paper.
> Seems like 2 MHz is the minimum bandwidth required ?
>
> https://www.tapr.org/pdf/DCC2009-DATV-KB6CJZ-W6HHC.pdf
>
> Maybe only legacy ham Linear modes will be supported by our 1 MHz Rent-a- GEO effort ?
>
> Bernard,
> KC9SGV
>
>
> Sent from my iPad
>