2x8天线切换器/控制器/交换机，前些天收拾的时候找到了很久以前的2X8天切....双继电器结构的，很明显隔离度不够所以说想做一批2x8的天切，隔离度-70db以上，支撑web远程控制，电台波段联动和手动控制，不知道有没有人需要当然也可以用来驱动低功率带通阵列，最高耐受1500W到2000W，不知道搞出来有没有市场国外也有很多产品包括flexradio的，DX spots的，但是价格并不是很美好，这个预估搞完了售价应该是千元级吧... 看看古老的SIX PAK切换器，这家伙起码十几年了，PCB已经腐蚀，当个模型供着吧hhh... [upl-image-preview uuid=2c97e561-9e8a-4e0f-ad0e-61eee527a18c url=https://storage.hamcq.cn/2025-12-11/1765477471-22918-b8b519180e0bdd9a5430907389922a44.jpg alt={TEXT?}] [upl-image-preview uuid=c3b2ce79-d6e4-4c25-b37a-575acf375a19 url=https://storage.hamcq.cn/2025-12-11/1765477475-173229-d626522125ec43b06d60ccc9636e0868.jpg alt={TEXT?}]

建议把频率范围说清楚，要不然到了UHF，能支持2000瓦的可太厉害了。还有，2000瓦的信号源和负载如何解决？负载倒是还好，射频电阻+散热，成品油冷的可贵了，另外还得先搞一个2000瓦的功放出来🤣

2×8的切换器第一时间想到的是老朋友4O3A的。期待楼主能做出来指标不亚于4O3A，同样价格更加美丽的作品！

借楼问问有什么2x2的切换器或者类似产品吗？需求是A机A天线-B机B天线切换成 A机B天线-B机A天线

@"BH2VZC"#p89893 这东西一般叫transfer，通常情况四个端口， [upl-image-preview uuid=a54c4411-02c6-42ad-942e-8985b6676454 url=https://storage.hamcq.cn/2025-12-15/1765758854-583466-image.png alt={TEXT?}] - 断电：1-2/3-4 - 上电：1-3/2-4 （也可能是反着的）

[upl-image-preview uuid=590af4be-5781-4225-a605-bf783bc232d5 url=https://storage.hamcq.cn/2025-12-15/1765759478-186652-2x6.jpg alt={TEXT?}] 这次CQWW做了小功率，配合FREQEZ控制系统效果不错，10米波段相邻两个天线口选通状态最大隔离度100dB左右，但这是做了非常多物理隔离措施的情况下。端口最大附加驻波1.05。这玩意用的人不多，一般只有比赛台或者SO2R疯子才会考虑。主要难点是隔离度，只有做了才知道具体问题在哪里，每个人设计工艺不一样出来效果也千差万别。

@"BH7JUO"#p90078 有点好奇，我之前也打算做个切换器，但是一直没明白如何提高隔离度。ai给出的回答都是用同轴的继电器，那用普通继电器或者开关，可以吗？以及除了继电器，还有其他需要注意的点吗？加屏蔽罩？不知道方不方便看看您做的切换器的内部照片，谢谢

@"BD3OZV"#p90095 开关使用最普通的松下继电器ALQ112（FTDX5000里的低通继电器，抗200W轻松）电路拓扑和这个类似：https://remoteqth.com/six-to-two-antenna-switch-DL.php 他是每一侧一个继电器，我扩展到3个级联，最大化提升断开后RADIO到ANT口隔离度。但整个系统隔离度主要受ANT选通后影响（例如RADIO1选择ANT1，RADIO2选择ANT4）两个ANT是否相邻对隔离度影响不太大，主要是整个系统空间耦合，包括外壳与内部各接触点是否贴紧。以前做过一个2X6 2KW的，内部图如下 https://www.hellocq.net/forum/read.php?tid=372371

@"BD3OZV"#p90095 短波的话一般普通的磁继电器就够用了，多个继电器分离可以提升部分隔离度。非常最求隔离度的话前些天董老师提出使用真空继电器和干簧管，或者有充足预算前提下用射频继电器拼接也可以

@"BI1NIZ"#p89863 哈哈哈哈，当然是短波，要是UHF/VHF 2kw有点吓人了，不过说实话短波2X8的需求就很少很少了，真搞出来估计也没啥使用需求，难不成已经有多组UHF阵列/锅的计划了？doge

@"BH2VZC"#p89893 猜你需要[upl-image-preview uuid=84a70f70-a7bb-42bb-863c-f38d95c97d27 url=https://storage.hamcq.cn/2025-12-16/1765908612-824652-210ece18bc96e4a42202be938fc3637d.jpg alt={TEXT?}] [upl-image-preview uuid=1ace4ffa-643d-4857-8b06-3da561d60816 url=https://storage.hamcq.cn/2025-12-16/1765908614-776175-80444464f8870ea629a1cd0426fe527d.jpg alt={TEXT?}] doge

2 x 8-day antenna switch / controller / switch

BeToDoing

2x8 antenna switch/controller/switch, I found this old 2x8 antenna switch a few days ago... It has a dual relay structure, and it's clearly not isolated enough.
So, if you're looking to build a batch of 2x8 antennas with isolation levels above -70dB, support for web remote control, radio band compatibility, and manual control, I wonder if anyone is interested.
Of course, it can also be used to drive low-power broadband arrays, with a maximum tolerance of 1500W to 2000W. I'm curious if there is a market for such a device.
There are also many products available internationally, including those for flexradio and DX spotting, but their prices aren't very attractive. Based on my estimate, the total cost of this project should be in the thousands of yuan.

Take a look at this old SIX PAK switch; it's probably been around for over ten years, and the PCB is already corroded. I guess I can use it as a model or something…

BI1NIZ

It's recommended to clearly specify the frequency range, otherwise, supporting 2000 watts at UHF could be excessive.
Also, how do we handle the 2000-watt signal source and load? The load itself is manageable; using RF resistors and heat sinks, plus the cost of finished oil-based products. Furthermore, we also need to acquire a 2000-watt amplifier first.🤣

BeToDoing

BI1NIZ Haha, of course it's shortwave. If a 2kW UHF/VHF system is intimidating, but honestly, the demand for 2x8 shortwave is very, very low. I doubt there would be much use for it if it were actually produced. Are you planning to have multiple sets of UHF arrays/pots? doge

BG5CZD

When considering a 2x8 switch, my first thought was the old friend, the 4O3A. I hope the main poster can create a product that meets or exceeds the performance of the 4O3A, and at a more beautiful price!

BeToDoing

BG5CZD It's truly wonderful, excluding the price, haha.

BH2VZC

I'm looking for a 2x2 switch or similar product that can switch between two antennas, such as: * Antenna A on Machine A to Antenna B on Machine B * Antenna A on Machine A to Antenna A on Machine B

BI1NIZ

BH2VZC This device is typically called a "transfer," and usually has four ports.

Power outage: 1-2 / 3-4
Power on: 1-3 / 2-4
(It could also be the opposite.)

BeToDoing

BH2VZC I guess you need...

doge

BeToDoing

BH2VZC If you need anything, please contact me. Haha, this thing still has some...

BH7JUO

The small-power CQWW setup, combined with the FREQEZ control system, performed well. When setting both antenna ports in the 10-meter band to "transmit," the maximum isolation between them was around 100 dB, but this required extensive physical isolation measures. The maximum reflected wave at the port was 1.05. This type of equipment is not widely used; it's typically only considered by those involved in competitions or serious SO2R (Software-Defined Radio) enthusiasts. The main challenge lies in the isolation performance, which varies depending on the design and implementation.

BD3OZV

BH7JUO I'm curious, I had also planned to build a switch, but I didn't understand how to improve isolation. The AI responses all suggested using coaxial relays, but can I use regular relays or switches instead? Are there any other important points to consider besides relays? Such as adding a shield?
I'm not sure if it would be possible for you to share some internal photos of the switch you built, thank you.

BeToDoing

BH7JUO I saw your post on hellocq, and you're right, the main applications are limited to S02R competition base and filter array.

BH7JUO

BD3OZV The switch uses the most common Panasonic relay, ALQ112 (the low-pass relay in the FTDX5000, which can easily handle 200W).
Circuit topology and something similar to this:https://remoteqth.com/six-to-two-antenna-switch-DL.php
It acts as a relay for each side, and I have extended it to a 3-stage cascade, maximizing the isolation between the radio output and the antenna input. However, the overall system's isolation is mainly affected by the selection of the antennas (e.g., RADIO1 selects ANT1, RADIO2 selects ANT4). The isolation between two adjacent antennas has less impact, primarily due to the overall spatial coupling within the system, including whether the enclosure and various internal contact points are tightly connected. I previously built a 2x6 2KW system with an internal diagram as follows:
https://www.hellocq.net/forum/read.php?tid=372371

BeToDoing

BD3OZV For shortwave communication, ordinary magnetic relays are usually sufficient. Using multiple relays with separation can improve isolation to some extent. If very high isolation is required, the following options have been suggested: using vacuum relays and reed switches, or using RF relays if a sufficient budget allows.

BI7BST

BeToDoing I need a switch that can handle approximately four inputs and four outputs. My requirements are: normally, 705 MHz connects to 750 MHz, SDR connects to the magnetic loop; when receiving satellites, switch the SDR to 750 MHz; when transmitting on 2 meters, switch 705 MHz to the long-wire antenna; when 705 MHz transmits on 70 cm, bypass the shortwave antenna on 750 MHz; one SDR is permanently connected to the long-wire antenna for listening to local repeaters; and a K5 is connected to the long-wire antenna during transmission. Currently, this is all done manually, involving searching through a large number of cables and adjusting them repeatedly. The metal powder from worn screws covers everything. Although I can operate at UV frequencies, the power output is only 10W.

BeToDoing

BI7BST First, you didn't clearly explain your environment. For example, I know you have a 750V toroidal coil and a rod antenna. Then, where does the fourth output go? Also, when you mentioned switching at 2 meters on shortwave, is it just for transmitting, or are you switching your radio to that frequency? And overall, your setup seems very complicated. You need to define a clear structure and topology. Why do you need four outputs if you only use a maximum of two antennas?

BI7BST

BeToDoing The fourth antenna is a spare 6-meter Yagi antenna; it's not used regularly, so I haven't mentioned it.
The IC-705 may receive and transmit on frequencies of 750V, with a whip antenna and small loop, while the SDR needs to switch to any available frequency for monitoring idle channels and transmitting PSK reports.
The 天调 design incorporates a feature where it can either connect directly or use an alternate path, as it sometimes needs to switch between the two. This is achieved by having one output reconnect to the input.
Connection: Radio output - in 1 - out 1 - terrestrial broadcast - in 2 - out 2 - antenna
Alternative path: Radio output - In 1 - Out 2 - Antenna

BeToDoing

BI7BST Using a 2x2 RF switch can easily solve the problem of using a parallel antenna. This is a simple solution, but it can be more difficult to implement manually. As you mentioned, a 6-meter Yagi antenna is not used frequently, so let's just manually connect it. The remaining situations involving multiple configurations should be considered based on your specific usage scenario, including whether you need isolation.

BI7BST

BeToDoing The isolation requirement only needs to ensure that the transmitter's signal does not damage the receiver SDR; any two devices are expected to operate on different frequency bands.

BeToDoing

Progress

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