RT. 不方便铺设地网，防盗窗效果也不大

@"BG5BJM"#p40559 之前有尝试吸盘吸在空调外机+地网贴；15米以上驻波配合GP拉杆大概能拉到1.6~，然后再用天调拉下来

@"BD8DLV"#p40569 不过我的发射效率非常低

@"BD8DLV"#p40569 我还加了一组3米的排线地网，在室内铺开，驻波可以到1.2。但是带宽很差，而且馈线的走向都会对中心频点和驻波产生不小的影响，每次要花点时间把想要的频点放在驻波曲线最低点。

不要用GP天线了，考虑一下偶极天线吧，鱼竿也可以做偶极天线，如果是单波段的，就把天调换成1:1的巴伦[upl-image-preview url=https://storage.hamcq.cn/2024-10-16/1729094738-851452-fireshot-capture-112-cq-wwwhellocqnet.png]

@"dxs660"#p40625 你这架法，不得天天被投诉

@"BH1LAF"#p40627 加个鱼线轮，下面的导线是可收缩的，需要的时候架出去，发射完收线，一分钟完成架设

我的GP阳台钓鱼竿架设, 地网一捆十根细线, 缠绕在阳台铁栏杆扶手上,全尺寸拉杆结果拉出了两个谐振波段,20米可以拉到1.0 不起表,同时 17米也有1.7-1.8,勉强可用. [upl-image-preview url=https://storage.hamcq.cn/2024-11-13/1731508609-783673-20241113223544.jpg]

天调不就是最好的方案吗，别想自然谐振了，就这不是自然谐振的场景。

阳台看你能伸出去多长，可以尝试一下车载短波台的假设方法，一米二的拉杆配合磁吸地网贴在空调外机上，剩下的交给天调。但是这种部署方式也就只能听个响，就不要追求发射效率了，FT8能通就满足。如果实在没法拉地网，某宝上有阳台正V的方案，可以试一下。

ma01磁吸在空调外机上把屋里暖气表面的漆划掉连接地 14M能到1.1左右

How can an antenna mounted on a balcony effectively reduce standing wave?

BG5BJM

RT.

It's not practical to install a ground-level security system, and the anti-theft window effect isn't very effective.

BD8DLV

BG5BJM Previously, I tried using a suction cup to attach to the air conditioner's outdoor unit and a ground wire; with a standing wave of over 15 meters and using a GP pull rod, I was able to pull approximately 1.6._{Then, use the antenna to bring it down.}

BI1TRT

BG5BJM I think the suction cup base type of floor cleaner from Old Dong's place is good; it doesn't take up much space, and you can directly buy that three-claw type.

BD8DLV

BD8DLV However, my transmission efficiency is very low.

Liridice

BD8DLV I also added a set of 3-meter coaxial cable ground network, which was laid indoors. The standing wave ratio could reach 1.2. However, the bandwidth was very poor, and the direction of the feed line would have a significant impact on both the center frequency and the standing wave ratio. I had to spend some time each time to place the desired frequency at the lowest point of the standing wave curve.

dxs660

Don't use the GP antenna; consider using a dipole antenna instead. You can also make a dipole antenna out of your fishing rod. If it's a single-band antenna, replace the antenna with a 1:1 Balun.

BH1LAF

dxs660 This vehicle cannot be used every day without complaints.

dxs660

BH1LAF Add a fish line reel, and the cable below is retractable; when not in use, it can be pulled out for deployment, and then retracted after firing. The entire setup can be completed in one minute.

BA7NNC-JOE

I have a fishing rod rack on my balcony, with a bundle of ten thin lines, wrapped around the iron railing of the balcony. The full-length pole can pull out two resonance bands, and at 20 meters, it can reach 1.0 without a scale. At 17 meters, it's about 1.7-1.8, which is barely usable.

BI1TRT

BA7NNC-JOE Could you please provide a diagram for better understanding?

BI1NIZ

Isn't Tian Dao the best solution? Don't think about natural resonance; this isn't a scenario involving natural resonance.

BH4GQD

BI1NIZ Yes, while it's true that using a "sky-to-ground" antenna can result in some signal loss, I don't think it's a significant issue.

BI7LVX

Look at your balcony and see how far you can extend it. You could try the assumption method for shortwave radio stations in cars: a 1.2-meter pull handle combined with a magnetic suction ground net attached to the air conditioner unit, leaving the rest to the antenna tuner. However, this deployment method only allows you to hear the sound, so don't focus on transmission efficiency; FT8 is sufficient as long as it can connect.
If you're really struggling to install a ground-based network, there's a solution on Taobao that involves mounting it directly on your balcony; you could try that.

BI3AMZ

The magnetic suction mount on the air conditioner's outdoor unit scratched off the paint on the wall near the thermostat. The cable (14M) reaches approximately 1.1 meters.

BI7LVX

BH4GQD They're all gone, so do you still care about that little bit of loss?

BI1NIZ

BH4GQD Yes, sometimes it's just impossible to achieve natural resonance on its own. Saying that a 2200 MHz band can't realistically create a 500-meter wave is accurate.

BA7NNC-JOE

BI1TRT It's very simple. I use a lamp stand, attaching the GP base to it, and then extend the fishing rod-like line out. The ground net is simply wrapped around the railing of the balcony using a snake-like pattern.

Although the 17 MHz band has a higher propagation loss, it's still possible to use it for FT8 operation.

BG5BJM

BA7NNC-JOE Thank you. I tried wrapping the mesh around the anti-theft window, and it had some effect when combined with the weather stripping. Overall, if I can go outside, I will. The balcony is too restrictive.

BA7NNC-JOE

BG5BJM Okay, I think I can achieve double harmonic resonance, which is likely the effect of the ground wire wrapping. I replaced a standard wire with one that included a capacitor and pulled it to 40 meters at 1.2 wavelengths. Surprisingly, even at 15 meters, I achieved a 1.3 wavelength. This was quite unexpected. The addition of the capacitor clearly reduced efficiency, which means that using a "wild" setup might be necessary to achieve the desired effect.

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