I CAN'T WATCH NTSC TV

[aecs18]

Hello everyone.

I am trying to make this NTSC TV receiver using the crt_f python code but I can't receive any TV image.

First of all, I'm using Ubuntu 16.04, the RTL2832U dongle, and GRC using Pybombs (version 3.7.12.0). I don't know if I made something wrong in the process of creating the crt_f block but I think the program is running in a normal way just I can't watch any channel. The crt_f block is in a other module (pruebas) because I was not able to create de ntsc module following the same steps to making grc blocks.

The only thing I change in the program was the Channel Chooser because in South America we use different frequencies than Japan (55.25Mhz, 61, 25Mhz, 67.25Mhz, 77.25Mhz, etc...).

I really don't know what I can change in the program for watching the channels so I will appreciate your help. I'm sharing with you the captures about what I made. Thanks.