天线是通过20米50-3馈线连接到窗外楼下土质地面的5.6米GP天线，地网是由扁排线拆分成的16根5米线呈放射状分布，自动键通过3.5转6.35转接头连接至电台背面。在14MHz高功率发射会不受控制地不断自动发射点划，即使降低到1w发射也会出现发射一串点后自动发一个划和发射一串划后自动发一个点的问题，功率越大问题越严重，遂来论坛请教各位寻求解决方法[upl-image-preview uuid=37330c1b-8c58-4691-bb19-8383f728bb3c url=https://storage.hamcq.cn/2025-10-22/1761114003-542580-img-9314.jpg alt={TEXT?}]

换其他平衡天线或加扼流圈试试

@"Anonymous8"#p83238 周六去使用其他人在楼顶的七单元八木再测下，另外请问这个问题的成因是什么，共模电流吗

@"BI3AFQ"#p83243 如果你玩自动键不是用捏发法的话我觉着是用捏发法发报先捏滴再捏哒然后松的时候一块松最后发出来就是滴答滴答如果先捏滴再捏哒松的时候哒先松最后发出来就是滴答滴答滴发出来会多一个滴

@"Anonymous8"#p83268 是连续触碰滴或者哒完全不碰另一个，松手的时候会在后面跟一个相反的音，这个情况在中午的时候比较常见，至于现在则是正常的碰什么就发什么不会有相反的音在结尾，尝试着复现中午的异常但没成功

试试串几个磁环在线上？

@"BH6AOV"#p83283 购入了几个磁环，到货了试一下

@"[未知用户]"#p83283 购入了几个磁环，到货了试一下

另几个频段的情况 80米：能正常拍发，但有的时候拍发发现不出功率 40米：cw驻波高，三遍CQ打不完就会飙到1.8触发天调报警 20米：驻波良好，但是是自动连发最严重的频段，功率超过5w后随机拍哪个键都会自动不受控制发点划天气太冷暂时没去调整天线长度到几个频段最佳的长度，所有驻波都是天调强拉下来的

这种莫名其妙的bug一般就是共模电流沿着馈线外皮反向流到机器，破坏了机器的接地参考平面导致的，加扼流圈，换平衡天线，加接地可破

@"[未知用户]"#p83274 尝试不要捏键，或者去找电台设置里面：你想要的可能是 Iambic-A 模式但是电台设置成了 Iambic-B。。

The IC718 automatic keyer's uncontrolled operation cannot be resolved.

BI3AFQ

The antenna is connected to an external 5.6-meter GP antenna located on the ground outside, using a 20-meter 50-3 coaxial cable. The ground network consists of 16 lines, each 5 meters long, formed by splitting a flat coaxial cable and arranged radially. The automatic key connects to the back of the radio via 3.5mm to 6.35mm connectors. When transmitting at 14 MHz with high power, uncontrolled and continuous CQ calls occur, even when reduced to 1W transmission, problems arise where a series of dots are transmitted followed by a single dash, and then a series of dashes are transmitted followed by a single dot. The severity of the problem increases with increasing power. Therefore, I came to the forum seeking solutions.

BI3AFQ

Anonymous8 On Saturday, I will try using another Yagi antenna (Yagi-Uda antenna) located on the roof of a building, and also ask about the cause of this problem. Is it related to common mode current?

BI3AFQ

Anonymous8 It involves either continuous tapping or a complete lack of contact with the other, and when you release your hand, it produces an opposite sound. This situation is most common in the middle of the day. Currently, simply tapping or pressing something results in a normal sound without any accompanying opposite sound. I tried to recreate the midday anomaly, but I was unsuccessful.

BH6AOV

Try connecting a few magnetic rings online?

BI3AFQ

BH6AOV I purchased a few magnetic rings and have received them to try out.

BI3AFQ

Information on other frequency bands
80m: Can normally transmit and receive, but sometimes when transmitting, no power output is detected.
40 meters: CW with a high transmit power, repeated CQ calls won't complete before triggering the 1.8 kHz tone alarm.
20 meters: Good propagation, but it's the most problematic band for automatic transmit, especially when power exceeds 5W. Randomly pressing any key will cause uncontrolled transmission.

The weather was too cold, so I didn't adjust the antenna length to the optimal lengths for the best performance in several frequency bands. All the standing waves were caused by the strong pull of the antenna tuner.

BD8DIN

This strange bug usually occurs because common-mode current flows back from the outside of the feeder cable to the machine, disrupting the machine's ground reference plane. Adding a choke coil, replacing the unbalanced antenna, and adding grounding can solve the problem.

BI3AFQ

I switched to a Yagi antenna, and for the first half hour, there were no issues with continuous transmission. However, as time went on, the problem of continuous transmission became more severe. I have already placed an order for a counterweight, and will try it once it arrives.

BI3AFQ

10/26
The addition of a choke improved performance significantly, particularly for the most severe case at 14 MHz, resulting in very noticeable improvements. However, there was still some minor intermittent transmission in other frequency bands, with no instances of continuous transmission.

BH6AOV

BI3AFQ Not relying on it.

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