To check whether my DVB-T signal is on air

I am trying to do DVB-T and i was able to do that successfully using the blocks connected back to back at Gnu radio.Now when i do my transmitter part alone and try to check whether the video is on air or not by using airspy am getting my peak at the frequency at a point which is persisting only for some seconds what might be the problem to happen so??Does it mean my video is not properly transmitting,Help needed.
Thanks in advance,
Regards Soma Sundaram Ravindran

A post was merged into an existing topic: DVB-T using LIME-SDR and lime-mini