What's going on with this beep...!

Qi Lin's first reaction was that something was wrong with the radio, but after opening the radio shell and checking it carefully, he found no problems.

There are no radio stations in the wasteland at this moment, and the radio should not accept any signal. Even some messy electromagnetic waves should not make such a huge beep!

Qi Lin's eyes were on the radio's frequency modulation frequency - fm103.7.

This frequency is not comparable to any radio station in the old era. If you place it before the war and turn the radio to this channel, you will definitely hear a bunch of current noises, but at this moment the expression on Qi Lin's face has already frozen...

The internal communication channel of Lei Falcon Squad...is exactly 103.7!

Although they are not using this shortwave communication, the encoding of the channel is exactly the same.

“…is it a coincidence?”

Qi Lin took a deep breath and then connected the radio to the power supply again.

The harsh beep exploded in the room like thunder. Qi Lin had the urge to cover his ears, but he still heard all the beeps.

The more he heard the strange color on Qi Lin's face, the more intense it became. Before he knew it, he had accelerated the speed of the energy-gathering vortex to 3,500 revolutions...

After a while, Qi Lin unplugged the power supply.

To others, perhaps it was just an unbearable harsh noise, but Qi Lin heard something different from the beep.

The frequency of the beep is very high, but it is not fixed. It is constantly repeating several frequencies at high speed. If you don't listen carefully, you will be completely unable to hear the change of this frequency.

But just listening, the beeping is enough to make people feel a split headache, let alone analyze it with their ears.

Even Qi Lin was able to barely distinguish the frequency change with the help of the energy-concentrating vortex overloading force.

This is a string of Morse codes, which have been repeating three English letters.

“s.o.s”

International distress signal.

Is it Cheng Yanqiu? Cheng Yanqiu’s distress signal sent?

This idea popped up in Qi Lin's mind, but he quickly ruled it out.

The communication distance of short-wave frequency modulation is very close and is very easy to be intercepted and deciphered. The members of the Lei Falcon team will never use this method to send distress signals.

The most important point - although "sos" is an international distress signal, the distress signal used by Lei Falcon team is another string of encrypted thirty-two-digit characters. Without memorizing the password book, you will definitely not understand the content contained in this string of characters.

So who sent this distress signal...?

Could it be another dispatch team? But as far as Qi Lin knows, Lei Falcon has not sent out tasks recently. Even those secret tasks that cannot carry out manuscripts can be found with Qi Lin's authority after joining the Shadow Force - at least he can be sure that he is the only member of the organization near the ruins of Leshan City.

Moreover, even for other dispatch teams, they will not use the three characters sos as a distress signal.

A non-organized dispatch team? That's even more impossible. Even if they are forced to use FM radio to send, they won't be so coincidental that they "collided" on the Lei Falcon Squad's dedicated channel.

"Am I exposed?"

There is only Qi Lin who knows the channel for Lei Falcon Squad around the ruins of Leshan City. Obviously, the target of this type of help is Qi Lin.

Generally speaking, the farthest reception distance of FM broadcasts is about 150 kilometers to 200 kilometers, and the buzzing signal is so strong that the distance is definitely a little closer.

Qi Lin opened the map, drew a circle with his location as the center, and drew a circle with a radius of 100 kilometers on the scale as the radius. The source of this unknown distress signal should be within this circle.

As soon as the circle was drawn, Qi Lin couldn't help but frown.

This circle...more than three-quarters of the area are within the ruins of Leshan City.

Qi Lin suddenly felt that this distress signal was probably a trap.

In an equally classic movie "Alien", the protagonist and others received a "sorry signal" from an unknown source, which led to the subsequent series of terrifying events.

Could it be a signal from the main brain?

But...If the master brain has discovered his own trace, why bother to send biochemical monsters to encircle him directly, or simply wait until he penetrates into the ruins of the city before launching an attack. Anyway, his original purpose is to enter the ruins, so why bother to play this at this time?

Are you not afraid that this "suffering signal" will have the opposite effect of alerting the enemy?

Qi Lin believes that with the IQ and computing power of the main brain, he will never do such a move.

...

Qi Lin tried to change to other frequencies, but it was silent. Only when the frequency was adjusted to fm103.7 could the harsh beeping sound could be heard, and the content of the Morse code hidden in the beeping has never been changed.

"Three points, three long, three points" corresponds to s, o, s in the English letters.

However, this signal does not come from the ruins of Leshan City. As for how to determine the direction, Qi Lin came up with a solution.

He found a pack of compressed dry food, then took out the food inside, leaving only the packaging bag outside.

Packaging bags are made of plastic film and aluminum foil. As we all know, aluminum foil can block electromagnetic signals and is an ideal shielding material.

Qi Lin slightly folded the aluminum foil packaging bag, then covered the radio's antenna, leaving only a "window", and then slowly turned the simple "shield cover".

He soon discovered that when the window of this shield is aimed at the direction of the city ruins, the signal is the strongest, and when it turns to other directions, the signal will be somewhat disturbed.

"Sure enough... the signal source is in the ruins..."

Qi Lin repeated the test twice. Now, he can basically confirm that the source of the sending of this "harm signal" is in the ruins of the city.

And... it is the center of the ruins of the city.

Although his heart was filled with ominous premonition, Qi Lin did not retreat and put the radio back to his original place. He began to continue moving towards the inside of the ruins of the city.

From the inside of a dead city without any movement, an international distress signal was heard. This has to be said to be a very strange thing. Moreover, this distress signal was hidden in an extremely harsh beeping... This seemed to be concealing something... But why should it be concealed?
Chapter completed!