刚刚看到一个B站视频《身在异地，如何快速扫描活跃频率？业余无线电扫频利器tinySA ULTRA》。由此联想到FT891使用天线切换器和tinySA查看频谱是否可行。想听听大家的看法。https://www.bilibili.com/video/BV1NQX8YNEy7/?spm_id_from=333.1007.tianma.1-1-1.click&vd_source=fd170265102d4050aaf23d843abd47bd

图啥呢搞这么麻烦，换个 FT-710 吧。

@"BG5ELQ"#p58517 万一设备多呢

用实时频谱，国产也有的。

@"BG5ELQ"#p58517 主要是手头上刚好有tinySA，想着淘个天线切换器看看是否可以给FT891添加个好一点的频谱功能方便找台。这样FT8就不用拆机中频引出，也就不用添加SDR再连接电脑或手机看实时频谱。

买个同轴切换器自己做吧，淘宝上卖的哪种SDR切换器隔离度太差

@"BI1NIZ"#p58708 大佬，这个同轴切换器有建议参考的材料吗？想自己搞一个

可以去找找配合sdr使用的的方案，和配合tinySA一样的原理

@"BH2VZC"#p59015 咸鱼上很多，有4口也有3口的，18v给电就切换，利用电台的PTT信号触发

Could you advise on the feasibility of using an antenna switch and a tinySA to monitor the spectrum while using an FT891?

arwoon

I just saw a Bilibili video titled "How to quickly scan active frequencies when you're in a different location? tinySA ULTRA, a handy tool for amateur radio scanning." This made me think about whether it would be possible to use an FT891 with an antenna switch and a tinySA to monitor the spectrum. I'm interested in hearing everyone's opinions on this.https://www.bilibili.com/video/BV1NQX8YNEy7/?spm_id_from=333.1007.tianma.1-1-1.click&vd_source = fd170265102d4050aaf23d843abd47bd

BA7NNC-JOE

[Joining the 2025 CQ WPX event] https://www.bilibili.com/video/BV1C8ZAYAEb6/?share_source=copy_web&vd_source = 07eb812606c622be90ff9276b9b78460

The others are not feasible; 891 requires a spectrum, and that's exactly what I need.

arwoon

BG5ELQ

What's the big deal? Just get an FT-710 instead.

BI4PMQ

BG5ELQ In case of multiple devices.

arwoon

BG5ELQ The main reason was that I already had a tinySA, and I thought it would be useful to buy a transceiver to add some better spectrum functionality to the FT891, making it easier to find stations. This way, I wouldn't need to disassemble the FT891 to extract the center frequency, nor would I need to add an SDR and connect it to my computer or phone to view the real-time spectrum.

BG7NOD

Using real-time spectrum displays; there are also domestic options available.

BI1NIZ

Why not buy a coaxial switch and build it yourself? The coaxial switches sold on Taobao have very poor isolation performance.

BH2VZC

BI1NIZ
Hey, are there any recommended materials I can refer to when building my own coaxial switch?

BI1NIZ

BH2VZC There are many "dead fish" devices, some with 4 ports and others with 3. When power is applied (18V), it switches over and uses the radio's PTT signal to trigger it.

anger_young

You could look for solutions that are compatible with SDR and use a similar principle to tinySA.

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