台式机使用wsjt-x和jtdx控制G90N进行FT8通联，经常出现软件找不到电台的问题。我试过把电台的接地端搭载机箱上，保证了电脑可以控制电台，但是当电台发射时电脑的有线网连接直接中断，同时CAT断开，软件停止发送并报错。我还尝试了使用树莓派5来控制电台，这种情况下wsjtx是控制电台的，但是当连接ACC和CAT线时，电台上驻波显示非常奇怪，勉强用天调也是能调一下。但是同样的CAT断开的问题依旧会在发射的时候的出现，只能守听。我怀疑是发射的时候干扰到了USB😞，暂时不知道怎么解决这问题，接地的话也不知道接在什么地方合适。目前我只能使用手机上的FT8CN软件来进行通联，有些不太方便。有没有友台遇到过相似的问题？是怎么解决的？

你需要说一下你的天馈系统

@"xyzyx"#p89253 我是超过5w断开，现在加了磁环不断开了，但是发射功率在波动。

在电台和天线之间加扼流环，具体可以参考B站视频【关于大功率FT8掉USB和扼流圈磁环的几句经验】 https://www.bilibili.com/video/BV1dnsmz6EZQ

射频共模电流导致的干扰接地是没用的，只要有电气连接就会造成干扰。解决办法一是使用平衡天线或加扼流圈，二是使用隔离数传链路盒

@"BA3QU"#p89255 天馈的话是MA01天线吸在空调外机上，然后自己又弄了四根5米的的地网，盘在空调外机和屋里窗台上。

@"BG5EQA"#p89259 我现在直接用的10W发射，没注意功率出去多少，用手机的FT8CN的话在9W左右。现在我这套系统要是接在树莓派上，驻波扫出来是一个三个谷值的曲线，而且驻波还都在1.8左右。拔掉连接树莓派的线驻波就下来到1.0了，非常正常的一个单谷驻波显示。充满了困惑。

@"PPPPPAN"#p89262 我早上试着把FT8线上的磁环装在了USB线上，还是有相同的问题。而且天调在tune的时候，台式机的有线网还给干扰断开了。😂

MA-01天线馈电点处加扼流圈

@"BG2EWI"#p89278 可以非常肯定说可靠的接地对共模电流非常有用！前提是可靠的接地！只要是可靠接地共模电流就会被完全导入大地，就不会在设备端产生共模干扰！我研究这个好多年了，并且也为很多友台解决共模干扰！

G90N FT8 communication link lost during CAT operation.

xyzyx

BI7BST I tried using USB 2.0, but I experienced interference. However, it felt a bit better than using USB 3.0.😭
The DE19 will arrive tomorrow, so let's see what kind of results it produces. Then we can look into how to make the shielding enclosure.

BH7GUL

(Interference!) I once used my g90s in my rented apartment, setting up the antenna like a fishing rod and dropping it while transmitting.

xyzyx

I tried a different approach, but it still resolved the issue using DE19.😭
Perhaps, using a balanced antenna could also avoid this problem?

BG5EQA

xyzyx I've already fixed it by placing the magnetic loop on the feed line. The only remaining issue is that the standing wave ratio and power are constantly fluctuating during transmission, and I haven't been able to identify the cause. It doesn't affect transmission at 15W. However, the standing wave ratio is more stable when transmitting from a vehicle.

xyzyx

BG5EQA I tried adding a toroidal inductor to the feed line, but that didn't solve the problem. I ended up buying the DE19 instead.😭

BI6IRN

7300, GP4, the data cable is a standard 2-meter long cable with no magnetic ring on both ends. The mouse button was stuck, and the self-made inductor was placed behind the 7300, which only provided some improvement. A friend gave me several magnetic rings to put on the data cable, but it didn't work. Of the 12 magnetic rings, two were larger, and I wrapped the data cable around them 3 times (I could only wrap it down 3 times), wrapping it twice solved the problem. Please refer to this.

xyzyx

The final solution was DE19, which proved to be very stable and reliable once connected, eliminating the disconnection issue.😭

BG9OWJ

Try adjusting the ground wire, and then fine-tune the ALC. I often encounter this situation as well, using a MA-01 antenna plus suction cup base. I initially used a homemade short ground wire placed directly on the windowsill, but I found that by changing the position of the ground wire or fine-tuning the ALC, the interference issues improved.

CQ-BG8LTU

Previously, when I was at home, I used one end of the VHF antenna as a fishing rod antenna by extending it out the window.
When using G90N with computer-based FT8, it can disconnect.
The price of the "扼流圈" for catfish is too high.
I spent over twenty yuan on materials and then made it myself by hand, based on the pattern.
It seems to work well after a few days of testing.

BA4QBK

The higher the frequency, the more severe the interference. When using the 40-meter band, it works normally. However, when using the 15-meter or 10-meter bands, issues such as transmission interruption and software errors occur. Adding multiple magnetic loops on the control line can resolve this.

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