假设两个人，一个上中继了，一个没有上中继，我在他们中间，刚好可以听到他们呼叫，如果这两人离我的距离，发射功率相等，甚至就连天线设备都相等，唯一的区别就是有没有上中继，他们同时呼叫，我可以听到哪个台？我突然想到的问题，很好奇，所以问问，感谢

要具体情况具体分析，你的问题已经矛盾了 > 刚好可以听到他们呼叫， > ，我可以听到哪个台？如果忽略掉矛盾的前者，默认中继的情况比ab的情况好那么如果ab两人离你近，你会听到两人堆叠的信号，如果此时b上个中继，正好中继离你也近，a发射的频率又在b中继的下行频率，你会收到a和b中继堆叠的信号，此时你切到b中继的上行频率，你会听到b 如果ab都离你远，b上了个中继，中继功率更大，天线位置更好，你会收到b中继。而如果中继也距离你远的话，你什么都收不到 ps:中继台不考虑存在网络链路，距离远代表抄收不到，反之距离近

感觉题主就是想问一个中继下行和一个直频电台同时发射，且假设两个的信号强度啥的完全一样情况吧？这种情况下中继发射和直频电台对于你接收来说是完全等效的两个信号源吧？如果谁也压制不了谁，大概信号就会堆叠到一起然后啥也解调不出来？ PS：我不太确定你说的那个上中继的人的功率和天线指的是什么？对于你接收来说，如果真要假设天线功率情况相等，或许应该假设中继下行的功率和天馈和直频电台的情况相等，而与上中继的那个台的参数无关？

存中继的频道时候，接收频率肯定是听中继的下行（从中继发射的信号），那只能听到上了中继的HAM的信号如果问的是接收两个同场强同频率的FM信号，答案是一个都听不到，除非两个信号场强有较大差别。这一点在FM卫星转发器上经常见到。 FM模式下听不到例如短波SSB上多用户同频的声音堆叠效果，只能听到一个较强用户的声音。关键词可搜索_门限效应_

If both a repeater and a non-repeater are calling simultaneously, which one can I hear?

BG4KAV

Assuming two people, one is using a repeater and the other isn't, and I am located somewhere in between them, I can hear both of their calls simultaneously. If these two individuals are at equal distances from me, have equal transmission power (even including the antenna equipment), and the only difference is whether or not they are using a repeater, which frequency/channel do I hear when they call simultaneously?
I suddenly had a question that I was curious about, so I asked, thank you.

BH4HZD

We need to analyze each situation specifically; your question already contains contradictions.

I could just barely hear them calling out.

Can you tell me which channel it's on?

If we ignore the conflicting first option and assume a default relay situation, it's better than scenario ab.
If both A and B are close to you, you will hear the combined signals from them. If at this time, B is connected to a repeater that is also close to you, and A's frequency is within the downlink range of that repeater, you will receive the combined signal from A and the repeater. At this point, if you switch to the uplink frequency of the B repeater, you will hear B.
If both A and B are far away, but B is connected to a repeater with greater power and a better antenna position, you will receive signals from B through the repeater. However, if the repeater itself is also far away, you will not be able to receive any signals.

PS: Regarding repeaters, I don't consider network links; distance is a factor that affects reception.

KiyuAshes

I think the question is asking if it's possible to simultaneously transmit from both a repeater and a direct-mode radio station, assuming that their signal strengths are identical. In this scenario, would the repeater and the direct-mode radio station be completely equivalent as two signal sources for you to receive? If neither can interfere with the other, would the signals simply overlap and become impossible to decode?
PS: I'm not sure what you mean by "the person who operates the upper repeater" and their power/antenna. If we assume equal antenna powers, perhaps it would be more accurate to assume that the downlink power of the lower repeater is equal to that of a typical feedline or direct-to-frequency (DTR) station, rather than being related to the parameters of the upper repeater?

BH2VZC

When transmitting on a channel used for a repeater, you will receive the repeater's downlink (the signal transmitted by the repeater), and therefore can only hear the signals from other HAMs who are using the repeater.
If the question is about receiving two strong, same-frequency FM signals from the same field, the answer is that you won't hear either one unless there is a significant difference in signal strength between the two. This is commonly seen in FM satellite repeaters.
In FM mode, you won't be able to hear the overlapping effect of multiple users transmitting on the same frequency, such as shortwave SSB. You will only be able to hear the sound from one strong user.
Keywords can be searched.Threshold effect

闽ICP备2021006864号-7

闽公网安备35020602002794号互联网举报中心

用户协议隐私政策社区规范积分规则中继规则转载须知
更新日志联系我们常见问题友情链接运营报告赞助

浩奇科技（厦门）有限公司

是无线电，把我们联系在一起