玩FT8通信，电脑WSJT-x连接YAESU FTDX10,有时候能用可以通联，有时候只要一发射就会报错（如图）JTDX软件也是同样问题，有玩FT8的火腿知道是什么原因吗？ [upl-image-preview uuid=3b70318c-0c81-41ec-91d6-d267678fe03e url=https://storage.hamcq.cn/2025-03-15/1742038866-713036-3b70318c-0c81-41ec-91d6-d267678fe03e.png alt={TEXT?}] [upl-image-preview uuid=1a1b71fb-4ecd-4235-b024-b6ceb08d551f url=https://storage.hamcq.cn/2025-03-15/1742038889-112178-1a1b71fb-4ecd-4235-b024-b6ceb08d551f.png alt={TEXT?}]

加磁环或者隔离器啥的试试？

功率高了，调低功率，要不就加个轭流环

之前10m ft8一发射就掉线，被迫调到最小功率qrpp，后面套了两个磁环解决

之前用的阳台天线，不平衡，10m ft8 一发射就掉线，被迫调到最小功率 qrpp，后面套了两个磁环完美解决

发射时报错： 1. 首先解决天线，要平衡，我是倒 V 天线，FT891，尚未遇到过这个情况 2. 数据线上套点磁环

电台要接地！接地！接地！说明书写着的。

@"BG5GNC-NingBo"#p56852 说明书写的接地是防雷劈的吧

这个解决思路：首先从天线入手，更换成平衡天线会极大减少类似情况的发生。其次在天线和馈线之间加1:1巴伦或者用磁环绕扼流圈，抑制共模电流。最后在电台和电脑之间加USB隔离器或者采用无线方式连接。但解决不了馈线参与发射的问题，不建议单独使用。如果做了前两项，大功率发射或者个别频率发射依然掉CAT，可以考虑这一步。卡扣式的小磁环效果太差，把USB线套成蛇也不一定有效果，加一个USB隔离器一步到位。 @"BG5ELQ"#p56865 射频地，严格的话应该是1/4波长的地线

@"Liridice"#p56879 感觉USB隔离器的思路应该很正确。我用的是端馈天线，属于不平衡天线。我的891加了俩磁环仍然在一些频率有严重干扰，当然不是断连接，而是电脑一旦打字就乱跳。后面排查发现，干扰发生的同时，笔记本键盘上方的手机会提示检测到NFC设备。😋 断开音频线干扰照样存在，基本上就断定是USB线的问题，下次回去试试😊

不接地可能会使射频信号反馈( 发破射信坏号完整性) 口无意的频识率变动。接地彻底解决了我的这些无线电控制错误： 1、多个天线间距过近造成干扰，例如三倍频干扰。 2、雨天的不明干扰。 3、加了2个磁环毫无效果的问题。

I would like to ask about a specific error encountered during FT8 communication.

winterwind

I'm using FT8 communication with my computer running WSJT-x, connected to a YAESU FTDX10. Sometimes it works fine, but other times, as soon as I transmit, I get an error (as shown in the image). The JTDX software also exhibits this same problem. Does anyone who uses FT8 know what the cause might be?

Ethan

Have you tried adding a magnetic ring or isolator?

BI1MXY

The power is too high; reduce the power, or add a current-limiting ring.

BG5VLI

The antenna I was using on the balcony before was unbalanced, and with my 10m FT8 setup, it would immediately lose signal. I was forced to switch to the lowest power setting (QRSS), but then I added two magnetic loops, which perfectly solved the problem.

BG5VQE

Error during launch:

First, address the antenna issue. I need to balance it out. It's a reversed V antenna, FT891, and I haven't encountered this problem before.
Online data overlay magnetic ring

BG5GNC-NingBo

The radio needs to be grounded! Ground it! Ground it! As stated in the manual.

BG5ELQ

BG5GNC-NingBo According to the manual, grounding is for preventing lightning strikes, correct?

Liridice

This proposed solution:
First, start with the antenna and replace it with a balanced antenna to significantly reduce the occurrence of such problems.
Secondly, a 1:1 balun or a magnetic inductor can be added between the antenna and the feed line to suppress common-mode current.
Finally, use a USB isolator between the radio and computer, or connect wirelessly. However, this does not solve the problem of the feed line participating in transmission, so it is not recommended to use alone. If you have done the first two steps, even with high-power or single-frequency transmission, if CAT is still lost, consider this step.
The small magnetic ring with a clasp design doesn't work well; even wrapping a USB cable into a snake shape might not be effective. A USB isolator provides a complete solution.

BG5ELQ Ideally, a ground plane should be at least a quarter wavelength long.

BD8DLV

Liridice I think the idea of using a USB isolator should be correct.

I am using a coaxial antenna, which is an unbalanced antenna.

My 891, after adding two magnetic rings, still experienced significant interference at certain frequencies. This wasn't a complete disconnection, but rather the computer would randomly malfunction when I typed. Further investigation revealed that while the interference was occurring, my phone (located above the laptop keyboard) would display a notification indicating an NFC device had been detected.😋

Audio cable interference can still occur, and it's essentially determined that the problem lies with the USB cable. I will try replacing it next time.😊

BG5ELQ

Liridice The RF feed line effectively acts as an external conductor, right?

Liridice

BD8DLV I still recommend installing a choke at the base of the antenna, as I previously had my speaker damaged by common-mode current on the cable. If the choke doesn't completely solve the problem, then add an isolator.

BG5GNC-NingBo

Failure to ground properly can lead to unintended changes in the frequency response of the RF signal (resulting in a loss of signal integrity).
Proper grounding completely resolved these radio control issues I was experiencing:
1. The close proximity of multiple antennas causes interference, such as triple-beat interference.
2、Unidentified interference due to rain.
3、Adding two magnetic rings had no effect.

BD8DLV

Liridice Yes, even a laryngeal tube couldn't completely solve the problem.

BA4RCM

Liridice Should the current-limiting resistor be connected at the end of the feed line closest to the antenna, or at the end closest to the radio?

Liridice

BA4RCM It's best to place it closer to the antenna end.

BA7NNC-JOE

Mine is doing well, I haven't lost it much. I use a fishing rod from my balcony to extend the antenna out, and then use a net to wrap around the iron fence. However, I also added a choke coil at the output port of the antenna base, and I have wrapped the USB cable and audio cable around a magnetic ring.

BH9FPK

I'm very familiar with this question, please see the video: https://www.douyin.com/user/self?from_tab_name=main&modal_id = 7506491406363561275&showTab=post

Bi4KKF

Check the radio grounding.
Check antenna VSWR, remove antenna tuner to see if VSWR is high.
A passive antenna or a GP antenna with a lumped element circuit.
Replace the USB cable, add shielding and a magnetic ring.

If that doesn't work, come to me and I'll transplant it for you. The sea of troubles is vast, but eventually, you'll find your way back to shore.

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