我目前使用的是八重洲的FTM-300DR车台。车台有APRS功能于是试一试。我有这么几个问题希望有老玩家能够指导指导。 1. 我的QTH在北京，我看论坛中有人问过频率，是144.640MHz，在V段。我是需要将这个频率保存起来是吗？TX和RX的频率设置是一样的吗？ 2. APRS可以将自己的行迹信息保存下来吗？ 3. 我在车机设置中看到有消息的设置，我可以给我APRS报文中添加自定义的信息吗？同时，我应该如何才能收到其他APRS玩家的消息呢？ 4. 在设置中，我看到有数据链这个概念，这个是什么东西呢？我应该怎么设置呢？希望有老玩家能够指导一下，感觉有些迷惑。

1. 一样，中国都用 144.640 直频 2. 可以的，电台可以自己记录位置，如果附近有 APRS 网关（接收到信号转发到网上），APRS 网站可以显示轨迹 3. 需要机器支持显示自定义短信 4. 应该指的是路径吧，APRS 数据有个 Path 参数，APRS 中继（digipeater）使用这个参数，含义是这个数据包被中继的剩余次数。一般都用的 WIDEn-n（n是数字），比如 WIDE2-2，就是这个包最多被中继 2 次，经过一个中继，后面的 n 会 -1，如果到 0 就不会再被中继。

有一次在APRS.fi上看到一个人的自定义信息是类似二十年前bbs里用bbcode弄的跑马灯一样的效果，借楼问一下是怎么实现的。

@"BG2ELG"#p28122 这个中继和路径的话，是数据经过中继跳转自己+1的吗？我需要设置中继吗？我只要在移动中是不是就可以接收到其他用户发送的APRS的数据了呢？

@"xyzyx"#p28154 只要能收到就能显示别人的 APRS 数据（可能是附近的中继转发过来的，也可能是对方直频发过来的）。不需要像普通中继台那样设置中继参数，只需要设置 Path 参数，它只对中继有效，带有 Path 参数的 APRS 数据包，中继器听到后会进行转发。经过一个中继转发，中继就会把后面的 n -1。_如果对计算机网络有研究可以把它理解成 TTL。_ 举例：如果想要数据包被中继三次 1. 用户发射的时候设置好了 `WIDE3-3`（WIDE 的意思是广泛发射，任何中继都可以接收转发） 2. 假设附近有 APRS 中继 a，接收到了这个数据包，得知是 `WIDE3-3`，可以转发，于是修改成了 `WIDE3-2`，并在原始数据包中追加中继器自己的呼号（体现出路径中的节点）。 3. 中继 a 附近还有另一个中继 b，接收到 `WIDE3-2`，重复以上操作 3. 直到中继 d，接收到了 c 发出的 `WIDE3-0`，因为 TTL 已经归零了，不能转发，这条路到这里就结束了。参考资料 http://www.aprs.org/fix14439.html

@"Liridice"#p28116 感觉可能是直接在状态里加了HTML代码，能查看到原始数据包内容吗？

@"Liridice"#p28116 用APRSdroid试了一下，消息格式为: `E1[文本内容]` 即有这种效果 [upl-image-preview url=https://storage.hamcq.cn/2024-08-11/1723392623-812668-screenshot-2024-08-12-00-07-36-061-markviagp-edit.jpg]

@"BG6QED"#p28214 厉害，请问还有其他效果的控制代码么😀

@"Liridice"#p28218 还有个E2是文本在横向振动 `E2[文本内容]` 但我刚看了一下这两个消息格式aprs.tv有效果，在aprs.fi就是纯文本，没效果。

@"BG6QED"#p28219 谢谢，那应该是我记混了，这几天aprs.fi和aprs.tv我都用。🧐

APRS issues

xyzyx

I am currently using the Yaesu FTM-300DR base station. I decided to try out its APRS functionality.
I have a few questions that I hope experienced players can help me with.

My QTH is in Beijing, and I saw someone on the forum asking about the frequency, which is 144.640 MHz, in the V band. Do I need to save this frequency? Are the frequencies set for both the TX and RX the same?
Can APRS save its own tracking information?
I saw a setting for messages in the vehicle's settings. Can I add custom information to my APRS message? Also, how can I receive messages from other APRS users?
In the settings, I saw a concept called "data chain." What is this? How should I set it up?

I hope that experienced players can provide some guidance, as I'm feeling a bit confused.

BI1NIZ

xyzyx

144.640 MHz is the standard frequency used by BY in most provinces, except for Zhejiang (which should be 144.390).
If you have access to a good APRS network node (a connected APRS node) in your area, the position data will be automatically sent to the higher-level server and then distributed to other nodes. You can set up your own APRS node and receive data through the network. This part is related to APRS-IS, not the original APRS system.
Currently, there are very few people in Area 1 who will proactively send you APRS messages. This is because, during my long-term activity on the 640 frequency, I found that most APRS stations were primarily used for creating maps, and they did not have equipment with the ability to respond with text or engage in chat sessions. Many people simply use APRS as a way to transmit their position.

P.S.:
APRS is a feature-rich data mode, while most devices have limited functionality, primarily focusing on location transmission. If you want to fully enjoy APRS, I recommend purchasing two Kenwood units, such as the FT-710 or the D71, which are well-suited for APRS. Alternatively, you can use a soft modem and sound card (such as Soundmodem + YAAC) to experience APRS.

Liridice

I saw someone on aprs.fi with a custom message that looked like a "rolling marquee" effect, similar to what you might have seen in old BBS forums using BBCode. I was wondering how they achieved this.

BloodBlade

Liridice Is it possible to view the raw data packet content by adding HTML code directly within the status window?

BG6QED

Liridice I tried using APRSdroid, and the message format was:
E1 [text content]
This results in the desired effect.

BG2ELG

一样，中国都用 144.640 直频
可以的，电台可以自己记录位置，如果附近有 APRS 网关（接收到信号转发到网上），APRS 网站可以显示轨迹
需要机器支持显示自定义短信
应该指的是路径吧，APRS 数据有个 Path 参数，APRS 中继（digipeater）使用这个参数，含义是这个数据包被中继的剩余次数。一般都用的 WIDEn-n（n是数字），比如 WIDE2-2，就是这个包最多被中继 2 次，经过一个中继，后面的 n 会 -1，如果到 0 就不会再被中继。

xyzyx

BG2ELG Regarding this repeater and its path, does it involve data being relayed through itself plus one? Do I need to configure a repeater?
Can I receive APRS data transmitted by other users while on the move?

BG5CDM

BG2ELG Correction: Zhejiang Special 144.390 FM

BH2XIY

Refer to the previous message.

BG2EFX

The floor answered correctly.

BG2ELG

xyzyx

As long as I can receive data, I can display other people's APRS data (which may be relayed by a local repeater, or directly transmitted by the other party).

No need to configure relay parameters like a standard repeater; just set the Path parameter. This is only valid for repeaters, and when a repeater receives an APRS packet with the Path parameter, it will forward it. After one repeater forwards it, the repeater will then forward the next n-1.If you are studying computer networks, you can understand it as TTL.

For example, if you want a packet to be relayed three times.

The user has configured everything before launching. WIDE3-3(By "WIDE", I mean broadcasting over a wide range; any repeater can receive and retransmit.)
Assuming that there is an APRS repeater named "a" nearby, and it received this data packet, it learned that... WIDE3-3, which can be forwarded, so it was modified to: WIDE3-2, and also append the repeater's own callsign to the original data packet (indicating the node in the path).
There's also another repeater, 'b', nearby that I can receive from. WIDE3-2Repeat the above steps.
Until repeater D received the signal from C. WIDE3-0Because the TTL has expired, it cannot be forwarded, and this route ends here.

References http://www.aprs.org/fix14439.html

Liridice

BG6QED Great! Could you please provide any other control code examples with different effects?😀

BG6QED

Liridice
Another E2 corresponds to horizontal vibration of the text.
E2 [text content]
However, I just checked these two message formats: APRS.TV seems to work, while APRS.FI is purely text-based and doesn't seem to have any effect.

Liridice

BG6QED Thank you, I think I must have mixed those up. I've been using aprs.fi and aprs.tv lately.🧐

BG9JDI

The APRS network simply forwards data packets in real-time, without storing any data. Websites like aprsfi are third-party services that store and display real-time data on a map. You can view the track on these services.
I can add custom messages to your APRS transmissions. When you receive data packets from other APRS users, if your equipment supports decoding, it will display their data packets, and the message should also be displayed.
APRS also has a short message feature that requires both devices to be compatible.

Liridice

BI1NIZ The urine map was incredibly realistic.

BG5CDM

BI1NIZ I have set up an APRS Digi and IGate unit. I've also tried APRS SMS, and it seems to work well.

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