"Continue testing, now the distance is about four miles, and there is still a sound......"

In the department, there was a hint of a female voice with a murmur, which was the four women in spring, summer, autumn and winter talking through the walkie-talkie!

The success of the walkie-talkie has greatly boosted the confidence of everyone in the department, but at the same time, they also want to know where the limit of the walkie-talkie is!

Even if everyone already knows that the walkie-talkie is just a 'test item' for the front station, it is still necessary to figure out its limits!

When the distance between the two places was raised to more than four miles, a murmur had already begun to come from the intercom......

However, in the end, he persisted until his early seven miles, and some staccato sounds could still be heard, but that's all.

In the end, he continued, but he never exceeded seven miles, and when he was close to seven miles, there was no signal at all, and he could no longer hear the other party's voice......

"About seven miles, converted into kilometers, more than three kilometers...... Enough is enough!"

Lin Zifan couldn't help but smile slightly.

Even if it is a modern walkie-talkie, if there is no other auxiliary equipment, the communication range is only about three kilometers.

This test, spring, summer, autumn and winter are all in Chang'an City, many buildings are lined up, the terrain is complex, in this case it can reach more than three kilometers, the walkie-talkie is undoubtedly successful!

"Then it's time for the next stage of development and testing......

After returning from spring, summer, autumn and winter, Lin Zifan directly announced that he would start developing a radio station for long-distance calls!

The time of the task is only one month, which is not too long, not to mention, after more than a month, Lin Zifan will marry the empress, and he will inevitably be busy for a while.

In other words, Lin Zifan must get all this done within a month, so as not to make the rest of the time seem too busy.

"However, this pair of walkie-talkies is not completely useless......

Looking at the walkie-talkie in his hand, Lin Zifan's mind turned and he thought of the use.

Now, the empress's bedroom has really moved to the 'high-altitude villa'......

The empress can fly now, but there is no problem, she can fly directly with a light flutter, but Lin Zifan can't......

If the empress is not there, if Lin Zifan wants to go up, he can only ...... Crawl!!!

Even if he later used the 'wood' ability to entangle the branches to form a wooden ladder, which went straight to the sky like a ladder, it still hurt a little to climb thousands of meters.

It's a bit of a waste of time.

It's not just Lin Zifan, such as Tsing Yi and Ziyi, or civil and military officials, if you want to find the empress now, it's also a bit ...... Troublesome!

The civil and military officials are a little better, and they are not easy to climb the tree directly, if they have something to find the empress, they will call under the tree...... To put it bluntly, it is to call the subordinates......

Tsing Yi and purple clothes are different, they also have to shoulder the task of delivering meals to the empress, climbing up and down every day, it is a little troublesome, and it is not very convenient to notify the empress to come down.

You can't just shout at the bottom every time you get to dinner, right?

If there is a pair of walkie-talkies, one for the empress and one for the purple clothes in Tsing Yi, wouldn't it be fine?

Of course, the best thing to do is to have one on the tree and one under the tree......

In this way, no matter who goes under the tree, if the empress is on the tree, she can communicate directly through the walkie-talkie, without being so troublesome, and without shouting to affect the image~

In the evening, when Lin Zifan put the walkie-talkie and turned it on, the call of Tsing Yi and purple clothes suddenly came from the walkie-talkie, which seemed to be a 'brick', and the empress was stunned for a moment.

"...... this?"

"Walkie-talkie, can talk to people under the tree normally, Your Majesty try?" Lin Zifan said with a smile.

The empress nodded slowly, very curious and puzzled, but still said softly: "Tsing Yi Ziyi, can you hear my voice?"

"Your Majesty???"

On the walkie-talkie, the two girls cheered in surprise and excitement: "Can you really hear Your Majesty's voice?" Our sisters thought that Lin Shangshu was blowing...... Forehead ......"

"However, this pair of walkie-talkies is really so magical?"

"There's such a thing?"

The Empress was completely surprised!

Clearly separated by thousands of meters, but they can have a normal conversation as if they were face-to-face, this method is really too unbelievable in the eyes of people in this era.

Even if she is as strong as the empress, she was surprised when she saw the walkie-talkie for the first time.

"How did you come up with that?"

"This ...... I had an idea, I thought we needed something like this, and I came up with it......"

Lin Zifan coughed dryly and lied.

This kind of thing must not be told the truth, otherwise, there will be too many problems in the future, and it is difficult to explain in one word!

"Is that so?"

The empress looked at Lin Zifan's gaze, a little strange, but in the end she didn't say anything, but asked an extremely important question: "How far can this walkie-talkie be able to talk normally?"

The empress asked directly to the point.

Obviously, it is impossible for two such small things to talk normally in the north and south, which is simply impossible!

However, the empress never thought that the communication distance of this walkie-talkie is infinite!

As long as it can cover all parts of Datang, the role and value that walkie-talkies can produce are enough to be called immeasurable!

"At the moment, there are less than seven miles of land. ”

Lin Zifan smiled: "However, within a month, it should be possible to increase the communication range to the point where you can talk normally from Chang'an to Asan Province!"

"Can it cover Datang and Asan?"

The empress said: "Can it really be done?"

Although she had thought so before, the empress was ready to be disappointed, but she didn't expect that Lin Zifan would give a more perfect answer than she imagined!

It can not only cover the entire Datang, but also cover the three provinces???

If that's the case, it's too big!

The empress instantly saw the importance of the walkie-talkie!

With the existence of this thing, Datang is too much more convenient!

From now on, whether it is military scheduling, business development, or policy announcements, you can completely cancel the previous time-consuming and laborious means such as 'messengers' and 'cloud eagle messengers', and switch to the direct use of walkie-talkies!

The speed of this thing's conversation is like two people talking face-to-face, which is much, much faster than using messengers and sending books with Yunying or something!

When that day comes, Datang's military command and combat effectiveness will improve in a straight line!

Regardless of the others, this alone is enough to show the importance and value of walkie-talkies!

At this moment, in the eyes of the empress, the value of the walkie-talkie is not overwhelming by priceless treasures!