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

Would the same phenomenon occur if a smaller loop antenna was used instead?

Liridice

xyzyx At the very least, I tried to position it as close as possible to the power source, because the feed lines before the inductor are also involved in transmitting. I attached the antenna to the air conditioner's outdoor unit, using an 80cm RG316 cable that entered the room through a window gap, connected to an inductor, and then to a feed line.

xyzyx

Liridice I'm using the MR5A suction cup base from Diamond. Currently, I can only add the choke coil to the radio side, and then try to position the output of the suction cup as far away as possible.

Liridice

xyzyx In summary, the choke coil should be located away from the radio end and close to the power supply point. When the ground is not good, the feed line between the choke coil and the power supply point will become part of the antenna, resulting in both common-mode interference and radiation interference without common-mode filtering.

Hangying

Learning

xyzyx

Liridice I get it! Why not just wrap the magnetic ring around the base itself?
One more question: what parameters should I choose for the magnetic ring? Should it be a nickel-zinc magnetic ring?

BD3QYZ

xyzyx Buy a few magnetic ring connectors with jacks on both ends (for data and audio cables). You can find these on Taobao in large quantities; choose the ones that match your cable diameter, or buy a ferrite ring.

Liridice

xyzyx I haven't done it myself, you can copy an assignment, for example, NXO-100 with a magnetic coil wrapped around it 8 times.

xyzyx

BD3QYZ I have tried this method before, but it didn't seem to improve anything. I plan to try adding a choke to see if that helps.

xyzyx

Liridice I have already placed an order for an FT240-43, and I'm looking forward to seeing how it works once it arrives.

BG5CPM

I used to have this problem too, but I solved it by directly purchasing a DE-19.

xyzyx

BG5CPM
I plan to first try building my own inductor myself, but if that doesn't work, I'll have to use the DE19.😭

BH7JUO

Buy used EMI magnetic rings, with a set of feed lines. If one doesn't work, buy two; if two don't work, buy ten; continue buying until I have enough.

xyzyx

BH7JUO Direct radio transmission via magnetic ring😂

BH7JUO

xyzyx You won't believe it, but actually, a previous base had over 100 loops connected.

Echo

I am a G90S laptop, and adding the magnetic ring doesn't help at all.😂As soon as a laptop's Siri is activated, it immediately appears.

xyzyx

Dear colleagues, I've added a magnetic loop, but it's still causing interference. It disconnects after just one transmission.
Now let's try DE19.😂

~~Absolutely endless padding!~~

BI7BST

This could also be due to the Raspberry Pi 5's poor interference resistance. When using my RSA Q6A with a USB 3.0 controller to connect to the ICOM-705, I experienced FT8 dropping out at 21MHz, and none of the magnetic loops helped. You might try connecting it to a USB 2.0 controller, or putting the Raspberry Pi in a metal case and grounding the case.

xyzyx

BI7BST Wow, I did connect it to a USB 3.0 port.👍
I'll try connecting with USB 2.0 in the evening, and also see how it works on my desktop computer.
However, grounding the Raspberry Pi case feels like going back to grounding a radio. Is it simply adding a shielding enclosure to the Raspberry Pi? And wouldn't the USB serial chip also be shielded in that case?😭

BI7BST

xyzyx Attach a shield to the Raspberry Pi; SBCs like this generally have poor electromagnetic radiation shielding capabilities.

xyzyx

BI7BST 试过了USB 2.0 还是有干扰，但是感觉比3.0强一些。😭
明天DE19就到了，看看什么效果。然后再研究研究屏蔽罩怎么弄。

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