对频好像只能近距离使用，对方机器发射3秒以上才可对频，那可不可以稍微改进一下，想办法可以长距离对频，是不是可以……（这就是我玩对讲机的初衷）

@"BI1WAH"#p61874 就是想看能不能把扫频的距离拉长，甚至更长

@"BI7CWM"#p61880 按我的理解是不是只要能接受的这个信号的距离就基本能扫到，如果再远的话应该就接收不到了信号了，大概率就无法扫频了吧，不过听说八重洲有个ASP功能，通过对小弱信号的特殊处理，可以一定成度上增加接收效果

@"BI1WAH"#p61882 对讲机不是能至少通联好几公里嘛，然后我想如果有办法只要能接受到对讲机信号就可以对频得上，而且亚音也可以破解，那是不是方圆好几公里的信号都能听到，再加上筛选功能，类似于浏览器搜索页面一样，搜索出很多结果，前提是可以扫频到远距离信号

@"BI7CWM"#p61883 根据这个需求，你需要的是SDR或者宽频接收机（如AR8200、ICOM R20、R30、孔雀石等等），而不是对讲机。SDR接电脑可直观看见一段频谱范围内的信号；而宽频接收机的扫描速度极快，通常一秒钟能扫描150-200个频点，也有哑音扫描功能。对讲机的一键对频功能的初衷，是方便多台设备快速统一频率组队使用。

VX6R的对频（频率扫描功能）是打开50dB的衰减器以后在给定中心频点一定频率范围内扫描的

@"[未知用户]"#p61883 亚音是抗干扰的，不是加密的。你的电台不设亚音，就能收到别人发射的带亚音的声音。你的电台设亚音，别人发射的信号不带亚音或者亚音码不匹配，你的电台就没有声音。但频率是被占用了的。

鱼和熊掌。对频时间就是鱼，对频距离就是熊掌。

@"BH2VYJ"#p61961 有效观察窗口时间增加，SNR就会增加😉

@"BH2VYJ"#p61961 哈哈哈哈，懂了

What is the principle behind one-button frequency selection on a handheld radio?

BI7CWM

It seems that frequency hopping can only be used at close range, and the other party's machine needs to transmit for more than 3 seconds before I can respond. Is there a way to improve this so that I can communicate over longer distances? (This is what I initially intended when using two-way radios.)

BI1WAH

Scanning for interference + remote noise cancellation?

BI7CWM

BI1WAH I want to see if it's possible to extend the scanning distance, even further.

BI1WAH

BI7CWM Based on my understanding, if I can receive a signal within a certain range, I should be able to scan it. If the distance is too far, I shouldn't be able to receive the signal, and it's likely that I won't be able to scan frequencies. However, I heard that Yaesu has an ASP function that can enhance reception by processing weak signals in a special way.

BI7CWM

BI1WAH Walkie-talkies can't communicate over several kilometers, right? So, if there was a way to receive walkie-talkie signals and then tune into them, even at low frequencies, and also crack the encryption, wouldn't that mean you could hear signals from several kilometers away? Plus, with a filtering function similar to a browser search page, you could find many results, as long as you can scan for distant signals.

BG5LU

BI7CWM Based on this requirement, you need an SDR (Software Defined Radio) or wideband receiver (such as the AR8200, ICOM R20, R30, and Peacock Stone), rather than a walkie-talkie. An SDR can be connected to a computer to visually observe a range of signals within a spectrum; in addition, wideband receivers have very fast scanning speeds, typically able to scan 150-200 frequencies per second, and also include silent scanning functionality. The one-button frequency synchronization function of walkie-talkies is intended to facilitate the rapid and coordinated use of multiple devices on the same frequency.

BG5JFI

BI7CWM I remember that the UVK5 firmware from Losehu had a spectrum analyzer function... Then you could easily see where the signal was, and then tune to that channel. This should allow you to measure sub-audio frequencies.

BI7CWM

BG5LU I was surprised to find that the things I had imagined were already available for sale online. Haha, it turns out this is called an SDR. Do you have any recommendations under 300 yuan? As a student, I can't afford something too expensive.

BD8DLV

The "frequency scan" function of the VX6R involves scanning within a specified frequency range around a given center frequency after opening a 50dB attenuator.

BH2VYJ

Fish and bear's paw.
The frequency time is like a fish, and the frequency distance is like a bear paw.

BD7PRI

BH2VYJ An increased effective observation window time will result in an increase in SNR.😉

BI7CWM

BH2VYJ Haha, I understand.

BG2EFX

You need an SDR ~
If you enjoy web-based operation, set up your own openRX system.

dovesky

Although I don't know the specific principle, we can try this approach: First, use software and hardware to quickly scan for signals with high signal strength and compare them. This will identify the frequency point with the highest signal strength. Then, it is highly likely that this frequency point corresponds to another device that is also scanning (because it's close by, so it should be the strongest). Finally, using sub-audio frequencies, we can use software to sequentially switch between different sub-audio frequencies. Once a sub-audio frequency is found that can decode the voice signal, then the task is essentially complete.

BH4GTG

My understanding is that, in one-button frequency measurement, the device first identifies the frequency with the highest field strength (which requires being close to the object), and then scans for a silent tone (requiring at least 3 seconds) to complete the frequency measurement.
If you want to perform long-range frequency hopping, this involves signal interference. For example, how can two signals with the same field strength be distinguished, and whether they need to be differentiated? If you aim for cost-effectiveness, it will likely be quite low.

BI7CWM

BH4GTG Could I use something similar to an oscilloscope, to display the signal strength of all signals within a certain range in graphical form? With a step frequency of 0.0005 MHz, and highlighting frequencies that are significantly higher than other signals, then changing the received signal frequency to this value, would that allow me to achieve synchronization with any signal?

BD8DLV

BI7CWM The ID-52 and ID-50 handheld radios both have waterfall plots, which can partially meet the requirements. The FT-5DR and 3DR series also have spectrum displays.

BI7CWM

BG5JFI Can it only be used with firmware for K5 and K6? Are there any other tools or software available, including those for computers?

BG5LU

BI7CWM Most chips under 300 are for TV sticks. Just getting one is enough, and you don't need to demand too much in terms of signal-to-noise ratio or sensitivity. Check Taobao or Xianyu frequently; ideally, the seller should provide accompanying drivers and software so that you don't have to search everywhere yourself. The most important thing is to have as large an outdoor antenna as possible, and having an outdoor antenna will significantly improve performance.

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