Has anyone tried using a 100-meter cable?

BI8EXB

家在2楼，整楼有32层，差不多100多米吗，没法阳台弄天线，楼顶弄天线的话，得100米+的馈线，也没条件弄端馈，这种情况是不是就没法玩短波了啊

wrangler

BI8EXB 几年前测过一次，大概109m的二分之一英寸国产波纹管，25w发射，天线段剩9w，vhf航空频段。短波应该好不少。

BH1QAE

BI8EXB 起码用二分之一馈管，频率越低损耗越少，短波还是可以的。

YofoaStudio

It can be used; please note that there will be some power consumption, and the actual transmitted power will not be very high.

BG6HFD

Without a slightly better feeder cable, 100m transmission won't work? The cost of the cable cannot be avoided, otherwise the losses will be significant.

BI8EXB

BG6HFD
BH2XIY
The sliding door was too large and heavy; I'm a little worried about being able to pull it open on the 32nd floor.😂

BH2XIY

A 100-meter antenna is definitely required.

BI8EXB

Anonymous2
The loss of 50-3 at 100 meters seems very high. If it's 10M and 100W, then reducing it to 20W might be possible?

BI8EXB

I'm not sure what the actual situation is, but I don't think it's possible to set up a table indoors. I guess I'll have to set it up outdoors instead.😂

BG8AMG

Hey, with a 100-meter feed line, there's not much you can do. You might be able to experiment in the low frequency range.

BG5CZD

Anonymous2 ？？？ Little kid
I was wondering, shouldn't we aim to minimize losses? If we don't allow users to input values like 1/2 or 7/8, or even just 50-3...
And another thing is that the losses due to shortwave feed lines are not as significant as expected. Using 50-7, 50-9, 50-12, and 50-22 all work perfectly.

BI8EXB

SuoYuC
Bi4KKF
BG5CZD
I checked online and found that the diameter and weight of the cable are quite large. When hanging it vertically at 100 meters, I felt it was too dangerous and difficult to control.

BG2EWI

BG5CZD The 50-22 size is simply too difficult to handle.

Bi4KKF

I vaguely remember that the 1/2 wave antenna had a loss of 8 dB at 100 meters, and it was connected to the U-end. There were fewer shortwave signals.

SuoYuC

7/8 frequency tube, if exceeding 54MHz, it's recommended to stop experimenting.

BG5LU

The machine is placed on the top floor, with network cables running down to it. The control panel is located in the house.

BI8EXB

BG5LU Due to unreliable power supply and concerns about being handled or damaged, it seems like the only option now is to use a makeshift setup.

BG2EWI

BI8EXB 如果是外墙的话十来层还可以直接放线，再高的话就得走电井了，光靠线自身拉不住

BG4JHP

I also want to know, our building has a total of 22 floors. When I used my drone to fly up, it reached approximately 120 feet, which is roughly level with the top floor.

BH2VZC

If there's landscaping on the ground floor, consider discussing it with either the ground floor residents or the property management. You could potentially install a fixed antenna on the ground floor and run a few meters of cable to an external location.
It's highly unlikely that a 100m cable would be run without using feeder cables.
Alternatively, you could install a simple antenna on the roof and bring your equipment up to the terrace if you want to use it.

zhou2008

I agree with the previous comment. Instead of individual radios, it would be better to have a central control system that manages an entire network of radios. These radios could then be connected to the network via Ethernet cables or wirelessly, and controlled directly from software on your phone or computer.

BI4PMQ

M tested it, and you can find videos on Bilibili.
Flow rate: Even if you use a UV segment of 100 meters with a flow rate of 50-22, you won't have much remaining.
The SWR on the 100-meter band is acceptable, provided that the feedline is thick enough.
Just like men and catheters, the thicker, the better.

BA7NNC-JOE

I also managed to make contact with a friendly station. They used a 100-meter feedline/feedhorn (I've forgotten the exact details), and made an U-shaped connection, using a Yaesu radio. The signal was usable.

闽ICP备2021006864号-7

闽公网安备35020602002794号互联网举报中心

用户协议隐私政策社区规范积分规则中继规则转载须知
更新日志联系我们常见问题友情链接运营报告赞助

浩奇科技（厦门）有限公司

是无线电，把我们联系在一起