中继是差频自动转发，那等于我守听到的所有信息都是中继转发过来的，可以这样理解吗？如果是这样的话，那通过守听岂不是得不到关于信号传输相关的对比信息，因为不是直接接收的不同设备通过不同路径过来的信号，而实际上全部收到的都是中继转发的信号，没有办法直观对比，可以这样理解吗？

@"BD3QID"#p100644 那感觉第一步应该从收听信标台开始

虽然中继到你的场强一般是固定的，但是话音的质量仍然有区别

中继转发的时候，发射方的好的坏的都转发出来了，所以还是能从中继直观对比出信号好坏、设备差异

@"freedom_liao"#p100680 信标台不好找

实际上还是能分析出来的。第一，你可以根据场强来判断你跟中继之间的传输质量；第二，如果你跟中继之间的场强较高并且稳定，你就可以通过话音质量来判别发射方到中继的信号质量，底噪小说明信号质量高，底噪打说明发射功率小、离中继远或者有干扰。反之亦然，对方也可以通过这些信息来分析你的发射情况，并指导你做出相应调整。

@"BA4VUN"#p100861 这样也确实，中继转发是直接转发，没有处理过其他人的信号。守听可以得到我和中继的链路情况，和别人到中继的大体情况，但前提是我和中继之间很好。我之前理解成retimer了，这种模拟中继相当于是redriver，不是retimer。如果是类似数字转发retimer芯片，重新组包了就判断不出来了。

Today, I listened to the Longjing 145.77 MHz repeater.

freedom_liao

A repeater performs frequency-shift keying (FSK) automatic forwarding, which means that all the information I receive is transmitted by the repeater. Is this a correct understanding?
If that's the case, wouldn't listening passively prevent obtaining comparative information about signal transmission, because it doesn't involve directly receiving signals from different devices via different paths, but rather all received signals are relayed? Wouldn't this make it impossible to obtain a clear comparison?

BD3QID

Yes

freedom_liao

BD3QID The first step should be to start listening to the beacon station.

BD3QID

freedom_liao It's difficult to find the radio beacon.

BI4APF

It's 145.775.

BI4APF

Although the signal strength from a repeater to your location is typically constant, there can still be differences in audio quality.

BG6TA

When forwarding, both the good and bad signals from the transmitting end are transmitted, so it is still possible to directly compare the quality of the signal and differences in equipment through the repeater.

BA4VUN

In reality, it is still possible to analyze. First, you can determine the transmission quality between yourself and the repeater based on signal strength; second, if the signal strength between yourself and the repeater is high and stable, you can determine the signal quality from the transmitting end to the repeater through voice quality. Low background noise indicates good signal quality, while high background noise indicates low transmit power, a large distance from the repeater, or interference. Conversely, the other party can also analyze your transmission situation based on this information and guide you to make appropriate adjustments.

freedom_liao

BA4VUN This also means that the repeater simply relays signals without processing any other transmissions. A "listening station" can obtain information about my connection to the repeater, as well as the general situation of others connecting to the repeater, but this requires a good connection between me and the repeater.
I previously understood it as a retimer, but this analog repeater is actually similar to a redriver, not a retimer. If it's something like a digital forwarder with a retimer chip that re-packages the data, then I wouldn't be able to distinguish it.

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