为了扩大接收机发射范围，想再家中放置一个固定台，同时启动UV差转功能。考虑机制性价比的原因，不知道那些老设备具备此功能？有些说明书和介绍中都提质你单方向差转（说白了就是只能通过UV差转发射，但不能反向接收）。看的云里雾里的。所以想咨询各位，大家是否使用过这个功能？想要了解的心仪机器包括 icom2720h，yaesu ft-8800和ftm-100dr，如果有这类机器的有台也可以分享自己的经验。

威诺6600PRO就支持，我正好有一台要出

以下是关于ICOM IC-2720H、Yaesu FT-8800和FTM-100DR三款车台的UV差转功能综合说明，结合硬件改造、操作步骤及使用限制等关键信息整理： --- ### 📻 **1. ICOM IC-2720H 的UV差转功能** #### **开启方式** - **硬件改造**：需拆开机盖，移除CPU集电块附近的**贴片二极管**（位于红色方框标记处），否则差转功能无法激活 (https://www.chinaham.cn/jishufenxiang/406.html)(https://www.hellocq.net/forum/read.php?tid=306166)。 - **操作步骤**： 1. 合盖后同时按住两边的 **M/CALL键 + 电源键** 开机。 2. 分别设置左右频段的收发频率（例如左V段接收、右U段发射）。 3. 同时按下 **DUP + LOW + SET** 三键，屏幕显示两个闪烁的“L”图标即进入差转状态 (https://www.chinaham.cn/jishufenxiang/406.html)(https://www.hellocq.net/forum/read.php?tid=306166)。 #### **注意事项** - ⚠️ 发射时需接负载天线，避免功放损坏。 - 支持哑音频（CTCSS）和异频（DUP±）设置，但需自行调试 (https://www.chinaham.cn/jishufenxiang/406.html)]。 --- ### 📡 **2. Yaesu FT-8800 的UV差转功能** #### **开启方式** - **无需硬件改造**：通过菜单操作直接启用跨段中继，操作较简便 (http://www.360doc.com/content/17/0130/08/27898355_625387291.shtml)。 - **功能特性**： - 支持双向转发（A→B或B→A），例如A段接收438.000MHz时，B段可在145.000MHz发射。 - 开启后手持麦克风被禁用，按下PTT会提示“ERROR TX”错误 (http://www.360doc.com/content/17/0130/08/27898355_625387291.shtml)。 #### **注意事项** - 仅支持 **FM模拟模式**，不支持数字模式（如C4FM）(http://www.360doc.com/content/17/0130/08/27898355_625387291.shtml)。 - ⚠️ 长期使用需控制功率（建议中档20W或低档5W），避免过热。 - 建议开启 **TOT超时定时器**，防止持续发射损坏功放 (http://www.360doc.com/content/17/0130/08/27898355_625387291.shtml)。 --- ### 📶 **3. Yaesu FTM-100DR 的UV差转功能** #### **开启方式** - **隐藏功能**：与FTM-400XDR类似（同系列技术），通过组合键激活：关机状态下同时按住 **DISP + F + GM** 三键开机，屏幕显示“X-BAND Repeater”即开启 (http://www.360doc.com/content/17/0130/08/27898355_625387291.shtml)。 - **功能设置**： - 需预先设置AB频段频率、亚音、功率等参数。 - **关闭APRS MODEM** 功能以避免冲突 (http://www.360doc.com/content/17/0130/08/27898355_625387291.shtml)。 #### **注意事项** - 同样仅支持 **FM模拟模式**，数字模式下无法差转。 - ⚠️ 麦克风发热问题：建议使用时拔掉手持麦克风。 - 散热要求高，可搭配原装散热风扇（如SMB-201 + SAD-11G电源适配器）(http://www.360doc.com/content/17/0130/08/27898355_625387291.shtml)。 --- ### 💎 **三款设备对比总结** | 特性| ICOM IC-2720H| Yaesu FT-8800| Yaesu FTM-100DR| |---------------------|-----------------------------------|------------------------------------|----------------------------------| | **开启方式**| 需拆二极管 + 组合键| 菜单操作| 组合键（隐藏功能）| | **硬件改造**| ⚠️ 必选| 无需| 无需| | **功率限制**| 未明确，建议中低档| 建议≤20W| 建议≤20W| | **使用限制**| 需外接负载| 麦克风禁用，仅模拟模式| 麦克风禁用，仅模拟模式| | **散热要求**| 常规散热| 中低功率即可| 需额外散热风扇（长期使用）| --- ### ⚠️ **通用注意事项** 1. **频率范围**：确保发射频率在设备有效范围内（如FTM系列需在400-480MHz），否则提示“TX FREQ ERROR”(http://www.360doc.com/content/17/0130/08/27898355_625387291.shtml)。 2. **散热管理**：长期差转建议搭配散热风扇，尤其FTM系列 (http://www.360doc.com/content/17/0130/08/27898355_625387291.shtml)。 3. **模式兼容性**：三款设备均**不支持数字模式差转**（如C4FM/DMR），仅限FM模拟 (http://www.cqkexun.com/uploadfile/dxhcy.pdf)(http://www.360doc.com/content/17/0130/08/27898355_625387291.shtml)。 --- ### 💎 **选购建议** - **追求稳定性**：选FT-8800（免改造，操作简单）。 - **长期差转需求**：FTM-100DR需额外散热，但支持数字/模拟双模式（差转仅限模拟）。 - **动手能力强**：IC-2720H成本低，但改造有风险，适合临时差转场景。建议进一步查阅设备手册或社区讨论（如哈罗CQ (https://www.hellocq.net/forum/read.php?tid=306166)）确认细节，尤其是FTM-100DR的隐藏功能稳定性。

@"BG8KUQ"#p84403 FT-8900R也是可以的。海鲜市场大概也是1000元左右的价格

100dr如果谁有可以尝试一下，因为很多人说100dr不支持

8900,8800 都是可以的，设置一下就行，双向差转，和中继台一个效果，唯一就是这些机器都是UV跨段差转，不能UU或者VV同段差转

D9000 2720 2730 100D我知道是可以的用过

@"dxs660"#p84513 是的这些只需要简单设置就好了，这样可以在楼下用手台远距离通联了

@"BG2EFX"#p84545 2720和2730 肯定可以，d9000好像还具备内uu中继模式。100d用的时候支持发射也支持转向姐搜吗？这台机器众口纷纭，有人说能用有人说不能用所以有点担心

@"[未知用户]"#p84545 2720和2730 肯定可以，d9000好像还具备内uu中继模式。100d用的时候支持发射也支持转向姐搜吗？这台机器众口纷纭，有人说能用有人说不能用所以有点担心

@"bh1cqz"#p84621 30 和 20 需要拆个东西 100需要特定的按键激活特定的模式

Inquiry regarding the function of UV differential measurement for chassis.

bh1cqz

To expand the range of my receiver's transmission, I was considering adding a fixed antenna to my home setup while also enabling the UV differential transmit function. However, due to cost considerations, I'm wondering if older devices have this capability. Some manuals and descriptions mention unidirectional differential transmit (essentially, only transmitting via UV differential, but not receiving in reverse). This is confusing me. So, I was hoping to ask for advice from others: Have you used this feature before?
I am interested in learning more about the following radios: icom2720h, yaesu ft-8800, and ftm-100dr. If you own any of these radios, please share your experiences.

BG2GJJ

The Wi-NO 6600 PRO supports it, and I actually have one that I'm selling.

BG8KUQ

The following provides a comprehensive overview of the UV to HF/VHF conversion function for the ICOM IC-2720H, Yaesu FT-8800, and FTM-100DR mobile transceivers, combining key information on hardware modifications, operating steps, and usage limitations.

📻 1. UV differential transmission function of the ICOM IC-2720H

How to start it

Hardware modifications: Requires opening the laptop case and removing the component near the CPU.Patch diode(Located at the red box marker), otherwise the "differential switching" function cannot be activated.https://www.chinaham.cn/jishufenxiang/406.html)(https://www.hellocq.net/forum/read.php?tid=306166)。
Operating steps：
After sealing, simultaneously press both sides. M/CALL key + Power button Power on.
Independently set the transmit and receive frequencies for each frequency band (e.g., receive on the left V-band, transmit on the right U-band).
Press both buttons simultaneously. DUP + LOW + SET Three buttons. The screen displays two flashing "L" icons, indicating that the system has entered a differential mode.https://www.chinaham.cn/jishufenxiang/406.html)(https://www.hellocq.net/forum/read.php?tid=306166)。

Important notes

⚠️ Make sure to connect the load antenna during transmission to avoid damaging the amplifier.
Supports hearing aids（CTCSS）With DUP± setting, but requires manual adjustment.https://www.chinaham.cn/jishufenxiang/406.html)]。

📡 2. UV Difference Mode Function for Yaesu FT-8800

How to start it

No hardware modifications required.: Enable cross-band relay directly through menu operation; this is a convenient method.http://www.360doc.com/content/17/0130/08/27898355_625387291.shtml)。
Features and functionalities：
Supports bidirectional forwarding (A → B or B → A), for example, when segment A receives at 438.000 MHz, segment B can transmit at 145.000 MHz.
After enabling it, holding the microphone while using the device disables its functionality. Pressing PTT will display an "ERROR TX" error message.http://www.360doc.com/content/17/0130/08/27898355_625387291.shtml)。

Important notes

📶 3. UV Differential Transmit function of Yaesu FTM-100DR

How to start it

Hidden features: Similar to the FTM-400XDR (using the same technology), activation is achieved through a combination of keys:
Press and hold the following keys simultaneously when the device is turned off: DISP + F + GM Three-button power on; the screen displays "X-BAND Repeater" indicating that it has been turned on.http://www.360doc.com/content/17/0130/08/27898355_625387291.shtml)。
Function settings：
The AB frequency band frequencies, sub-audio, power, and other parameters must be pre-set.
Turn off the APRS MODEM Function to avoid conflictshttp://www.360doc.com/content/17/0130/08/27898355_625387291.shtml)。

Important notes

Also, it only supports FM simulation modeIn digital mode, differential steering is not possible.
⚠️ Microphone overheating issue: We recommend removing the handheld microphone when in use.
High cooling requirements; can be paired with the original fan (e.g., SMB-201 + SAD-11G power adapter).http://www.360doc.com/content/17/0130/08/27898355_625387291.shtml)。

💎 Summary of comparisons between three devices

Features	ICOM IC-2720H	Yaesu FT-8800	Yaesu FTM-100DR
How to start it	Requires disassembly of two diodes + combination keys.	Menu operations	Combination keys (hidden features)
Hardware modifications	⚠️ Required	No need	No need
Power limitation	Not specified; recommendation: mid-range to low-end.	Recommended ≤ 20W	Recommended ≤ 20W
Usage restrictions	Requires external load	Microphone disabled; only simulation mode available.	Microphone disabled; only simulation mode available.
Cooling requirements	Standard cooling	Suitable for low to medium power applications.	Requires an additional cooling fan (for long-term use)

⚠️ General Notes

Frequency rangeEnsure that the transmission frequency is within the device's valid range (e.g., FTM series must be between 400-480 MHz). If not, display "TX FREQ ERROR".http://www.360doc.com/content/17/0130/08/27898355_625387291.shtml)。
Thermal management: Recommended long-term case fan combinations, especially for the FTM series.http://www.360doc.com/content/17/0130/08/27898355_625387291.shtml)。
Mode compatibility: All three devices areDoes not support digital mode switching.(e.g., C4FM/DMR), only for FM simulationhttp://www.cqkexun.com/uploadfile/dxhcy.pdf)(http://www.360doc.com/content/17/0130/08/27898355_625387291.shtml)。

💎 Purchase recommendations

Striving for stability: Choose the FT-8800 (no modifications required, easy to operate).
Long-term differential rate demand: The FTM-100DR requires additional cooling, but supports both digital and analog modes (digital to analog conversion is limited to analog).
Strong practical skills: The IC-2720H has a low cost, but modifications carry risks, making it suitable for temporary deployments in different scenarios.

It is recommended to consult the device manual or community forums (such as Halo CQ) for further information.https://www.hellocq.net/forum/read.php?tid=306166) Confirm details, especially the stability of the hidden features in the FTM-100DR.

BG8KUQ

BG8KUQ The FT-8900R would also work. The price at the seafood market should be around 1000 yuan.

bh1cqz

100dr: If anyone can try it out, as many people say that 100dr is not supported.

dxs660

Both the 8900 and 8800 are suitable; you just need to configure them. They provide bidirectional frequency shifting, achieving the same effect as a repeater, but they only support UV (cross-band) frequency shifting, not UU or VV (same-band) frequency shifting.

bh1cqz

dxs660 Yes, this requires a simple setup, which allows for communication over long distances from the ground floor.

BG2EFX

D9000 2720 2730 100D I know it's okay, I've used it.

bh1cqz

BG2EFX Yes, the 2720 and 2730 should work. The d9000 also seems to have an internal repeater mode. Does it support transmitting when using a 100d? I'm concerned because there are conflicting opinions about this device; some people say it works, while others say it doesn't.

BG2EFX

bh1cqz 30 and 20 require a specific item to be disassembled. 100 requires activation of a specific mode using a particular key.

BA4SUA

bh1cqz The D9000 can be used with a UV antenna, and I use it to connect my handheld radio to the home base station to listen for distant repeaters while walking. I haven't tried using a UU antenna; the manual indicates that a duplexer is required.

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