The signal is weak here.

the Determiner

— Used, instead of a, to reference something specific, already known to exist. Compare "I read a book." and "I read the book." — Used with a stress, to show that the word following is special. Are you the John Smith that I went to school with? — Used with an adjective that acts like a noun to mean all of the people concerned The poor are always with us. — Used with superlatives forms of adjectives and adverbs. You are the best.

signal Noun

— A picture, or a light, or a movement of a hand, or other thing that tells people to do something. When I make this signal with my hand, everybody walk to the front of the room. — A picture, or a light, or a movement of a hand, or something else that lets someone recognize another person, a ship, an airplane or something else. The sailor saw the signal on the other ship and so recognized it was the enemy.

signal Verb

— When someone or something signals to someone, they use a signal to tell the person something. The red light signals to the cars to stop.

is Verb

— A form of the verb be when talking about someone or something else. He is late for class. Is it hot in here?

weak Adjective

— Weak is used to describe something that does not have a lot of strength. The child was too weak to move the boulder. — Something that is weak does not have a strong taste. This tea tastes weak and watery. Do you have anything stronger?

here Preposition

— In this place, the current location. Why are you looking over there for the book? It's right here.