It depends on how impaired your captured signal is. Here's a list.
1) Signal to noise ratio. For 64QAM, you'll need about 20 dB of S/N, preferably more.
2) DC offset. If you have a large DC offset (big spike in the
middle of the received spectrum), that can cause problems. Unlike
LTE, DVB-T uses the center carrier, and a large DC offset will
destroy that carrier.
3) Multipath. You can determine how much multipath you have from the flatness of the signal. Here's what my test setup looks like. There's a little multipath since the signal slopes up to the right. If you have large peaks and valleys, then you have significant multipath.
Ron
On 03/16/2018 04:26 AM, Juan Antonio
wrote:
Thanks Ron
Now The constellation at the exit of demod reference signal now locks .
The duration of the file is 4 minutes fifty seconds 290 seconds. The four cores work almost 100%
At the moment I have not got a TS file at the exit that have content
A question could now be:Why a file created with gqrx from a real signal does not lock?
The only difference I see at a glance between a file created by gqrx and the one you send me is that yours has a much greater relation C/N that mine.
Best regards