求教一下，请问有没有可以让老电台显示频谱图的电脑软件？如果有的话怎么下载，怎么用？感谢

不改装的前提下基本没有可能。现在的方案要么是将SDR接收机连接到中频，要么直接共用天线。后者也有装在设备内，连接到电台接收部分和外置并加入切换开关两种。不过，直接用电台输出的音频转换为频谱图，也许是可以的，但是这样做的话带宽顶多也就是ssb的带宽，肯定不是你想要的。

@"BloodBlade"#p46904 哦哦好的知道了

单从需求上看协谷gsoc确实是个好东西，可惜这玩意似了

没有这样的东西，频谱图是采集（经过放大或变换后的）无线电信号，然后直接进 adc 转成数字信号，再 fft （快速傅里叶变换）得到的结果，这基本上就限定是 sdr 机器（或 sdr 模式的发射/接收机）才能做到，老电台整体架构和 sdr 完全不一样，改架构和买台新的没区别

老电台从硬件上就天生不支持显示频谱，最简单的方法就是额外买一个 SDR 然后再买一个天线共享器。天线共享器的原理就是在不发射的时候，电台和sdr共用一条天线，当电台发射的时候自动关闭sdr输入防止设备烧毁。这套方案还有一个好处就是，你可以同时监听多个频段，比如电台在 14M，sdr可以看 7M 也可以看 21M

@"Syryia"#p46909 卧槽，查了一下居然还有这种东西

如果电台有10.7MHz中频输出就好办，把中频输入IC-705这样的带频谱的接收机

Is there any software that can display a spectrum for older radio stations?

BH3FWS

Could you please advise me? Are there any computer software programs that can display a spectrum graph for older radio stations? If so, how do I download and use them? Thank you.

BloodBlade

Without modification, it's essentially impossible.

The current options are either to connect the SDR receiver to the intermediate frequency (IF) band, or to directly share the antenna. The latter option includes two configurations: one where the antenna is integrated into the device and connected to the radio receiving section, and another where an external switch is used to connect and disconnect the antenna.

However, directly converting audio output from a radio to a spectrogram might be possible, but this would limit the bandwidth to that of SSB, which is certainly not what you want.

BH3FWS

BloodBlade Okay, I understand.

BI2UV

There isn't such a thing. A spectrum analyzer captures (after amplification or transformation) a radio signal, then directly converts it to a digital signal using an ADC, and finally uses FFT (Fast Fourier Transform) to obtain the result. This essentially limits it to SDR machines (or SDR-mode transmitters/receivers). The overall architecture of traditional radios is completely different from that of an SDR; changing the architecture or buying a new one makes no difference.

BI7LVX

The old radio inherently doesn't support displaying a spectrum. The simplest solution is to buy an SDR and then purchase a separate antenna switch. The antenna switch works by allowing the radio and SDR to share a single antenna when not transmitting. When the radio transmits, the SDR automatically shuts off to prevent damage. This setup also has the advantage of allowing you to listen to multiple frequency bands simultaneously, such as the radio on 14 MHz, while the SDR can monitor 7 MHz or 21 MHz.

BG7NOD

Syryia Wow, I just checked it out, and there's actually something like that!

BD4SUR

If the radio has a 10.7 MHz intermediate frequency (IF) output, it would be straightforward to connect it to a receiver like the IC-705, which has a spectrum analyzer.

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