According to Qi Zhenjiang, this kind of high-frequency radio wave belongs to the ground wave, which does not enter the atmosphere, let alone the ionosphere, but only propagates according to the surface.

Because of the poor diffraction force, the transmission distance can only reach a maximum of ten kilometers, and in a densely built area like Nanjing, it may not be discounted.

Fang Buwei understood as soon as he heard it.

Aren't walkie-talkies of a similar nature in later generations?

Qi Zhenjiang also explained that the reason why the Japanese consulate uses this kind of radio wave is probably because the power of the other party's transceiver equipment is too low, and if it is replaced with other radio wave frequencies transmitted over long distances, the other party will not be able to reply even if it can receive it.

The power is too low to recover?

Fang Buwei suddenly thought of the time when Li Fengnian was arrested, the low-frequency radio used by Li Fengnian's subordinates.

It seems that the Japanese had been prepared for a long time, and in order to guard against the possibility of the Nanjing secret service taking advantage of the power outage in the zone to find the station, they prepared a low-frequency radio station that could be activated only with dry batteries.

Hearing this, Gu Zhenlong frowned fiercely: "In this way, the method of zoning power outage will not work!" ”

"Indeed!" Qi Zhenjiang replied.

For him, as long as the radio station that received this signal dares to reply, he can use the system positioning to find out.

Of course, you have to make it first.

Fang Buwei also nodded, showing a hint of sadness just right.

"Do you have times when you're worried?" Gu Zhenlong laughed and said with relief, "Don't worry, even if the zonal power outage method doesn't work, the radio station is still there, right?" With such a tight search, can the Japanese still put the radio in their pockets? ”

Qi Zhenjiang looked at Gu Zhenlong, and then at Fang Buwei, looking like he wanted to speak and stopped.

"If you fart, let it go!" Gu Zhenlong scolded.

"What if the Japanese spy team or radio station were hiding in a place where we couldn't search it?"

"Unlikely!" Ma Chunfeng shook his head, "The places that can't be searched, except for the consulate, the rest are our places, where can they hide?" Presidential Palace, Summer Palace? ”

The Summer Palace is also known as Meiling Palace.

"If a Japanese spy has the ability to hide in such a place, why do we need to investigate? Surrender as soon as possible......" Gu Zhenlong replied.

Fang Buwei's eyes flickered slightly.

He wished that a few more moles would jump out, otherwise he wouldn't be able to afford so much effort and setbacks.

"The consulate can't be ...... either. The Japanese know that as long as they have a relationship with them, all the places are guarded by our people, not to mention the consulate, they will not go to the Asahi Foreign Company, otherwise once they are targeted, it will be equivalent to being abolished, how can they act? Ma Chunfeng said again.

Not to mention places like the consulate and the Asahi Foreign Bank, in Nanjing, as long as the Japanese have a public identity, they are all on the list of major institutions, without exception, all of them are given special care.

This is also the result achieved by Fang Buwei after pushing hard.

"Then what if the Japanese spy only receives orders and doesn't need a radio at all?"

Qi Zhenjiang's love to lift the bar has been committed again.

Gu Zhenlong blew his beard and asked, "Then tell me, if they need to ask for instructions, how can they contact them?" Do you want to report to the embassy in person? ”

Qi Zhenjiang choked.

Fang Buwei thought about it along Qi Zhenjiang's axis.

If you don't use a radio station, your phone will be tapped again, how can you get in touch?

Learn the underground party on two legs?

The underground party had no money and could not afford to buy a radio station, so they used this extremely exposed method, and the brains of the Japanese were not kicked by donkeys.

There should be no such possibility, otherwise there is no way to explain the Japanese consulate's special use of high-frequency ground wave frequencies to send reports.

But Fang Buwei didn't expect that Qi Zhenjiang really got right.

Until dawn, he did not wait for the reply of this high-frequency signal.

The Japanese consulate sent another telegram on this frequency, but there was no reply.

The search team did not find any clues related to the espionage.

The thieves caught a lot, and the thieves also caught a few, and they also exchanged fire.

"No, withdraw the people first!" Ma Chunfeng sighed and looked at the time, "All the places that should be searched have been seen, there is less than an hour left, and it is not ......useful to keep it."

The martial law was reported for only eight hours, from 10 p.m. to 6 p.m., and at six o'clock, with or without results, the whole city had to return to normal.

"Wait, Director, I'll think about it first!"

Fang is not a return.

What's wrong with this?

Is it really as Qi Zhenjiang said, the other party only needs to receive orders, and does not need to report or ask for instructions, so there is no need to use the radio?

"I'm surprised?" Gu Zhenlong glared and asked, "Could it be that there is not a single secret radio station in Nanjing, none of the Japanese, and none of the underground parties?" ”

Fang Buwei can't figure it out.

The underground party is because he has reported that everything that should be withdrawn has been withdrawn, but what about the Japanese?

"Chief Qi, is it possible that we have missed some band frequencies?" Fang Bu asked suspiciously.

"Impossible!" Qi Zhenjiang pointed to a long row of radio stations, "All the bands are being monitored, as long as there is a signal, you can monitor it, and our people will make a copy and record in time......"

Fang Buwei glanced at Qi Zhenjiang deeply and walked to the front of a general radio station.

He slowly swirled and twisted, and a jumbled sound came over the radio.

There is a morning broadcast, but more often than not.

"Di-Di-......" Fang Buwei twisted to a frequency, and occasionally a signal came out of the radio, but most of it was noise, indicating that the signal was extremely poor.

"Is there anything missing? You fucking ......" Gu Zhenlong pointed at Qi Zhenjiang's nose and scolded.

Qi Zhenjiang couldn't laugh or cry: "Commander, listen to my explanation...... This is ultra-short wave, and the equipment required to transmit it is extremely complex and huge, how to say it? Sending a telegram at this frequency and wavelength is equivalent to using a cannon to fight mosquitoes...... No one will use it at all? ”

"No one will use it?" Fang Buwei's eyes widened violently.

Qi Zhenjiang nodded vigorously: "Yes!" At this stage, most of these radio waves are used for long-range navigation, and it is estimated that only military powers such as Britain, the United States, Germany, and Japan will use ......"

Fang Buwei's eyes rolled quickly.

I took it for granted that I made such a big joke?

No wonder no one contacted him for a week, it turned out that the underground party could not send radio waves of this wavelength and frequency at all.

Let's not think about this for now, and deal with the current hurdle in front of us.

"The Japanese don't use radio, so what do they rely on to communicate?" Gu Zhenlong said suspiciously, "Could it be that there are no Japanese spies in Nanjing City?" ”

Fang Buwei subconsciously pursed his lips.