Here it comes, right when Krog figured.

2 seconds sound clip from Radar Men from the Moon - Battle in the Stratosphere (S1E9).

You can hear this line at 00:09:28.784 in the Blu-ray version of the movie.

Quote context

[...]

- The rocket ship from Earth has been here again and has escaped with a supply of lunarium.

- That's serious, now they can build their own ray guns and prevent your invasion from the moon.

- Of course.

- So their ship must not be allowed to land. Calculate the time of their arrival and have your ray gun set up ready to blast them.

- This time you must not fail. Your own life and the future of our people are at stake.

- I understand, Your Excellency.

- You heard the orders. There must be no bumbling this time. I will draw up a detailed plan of operations.

- There we are. We ought to be able to pick up the good ol' Earth on a scanning screen pretty quick.

- Here it comes, right when Krog figured.

- Wait till it turns in for a landing.

- Okay.

- All right, Hank, make your 180 degree turn.

- Going in for a landing.

- Any time now.

[...]