不懂就问模拟APRS和数字APRS的区别？如何区分？各自的优劣是什么？能互相发射解码吗？牙医所艾可慕都是数字还是模拟？😂

个人理解，不知道对不对，共同学习。 aprs本身就是载波的一个数字编码-传输-解码的一个过程。 aprs是F1D/F2D模式，F代表调频，数字是通道数量，D是数字模式。所以所以不存在模拟aprs一说；（所谓的模拟个人理解为用模拟机器发射的aprs载波，但实际模拟机也是需要一个数字调制解调设备来完成编解码的）

APRS是信源数字编码，利用模拟信道就可以传输了。

是自由通的机器吧？ “模拟APRS”就是各品牌对讲机都在用的APRS，不管哪个牌子的机器，只要听得懂APRS的鸡叫声，自然就能解码。 “数字APRS”，通俗点讲，就是把APRS的鸡叫声再加工一下，变成了机枪突突声（DMR），可是并不是所有机器都能听得懂机枪声，听得懂机枪声的机器又很少有听得懂鸡叫声的，所以只有同时听得懂这两种声音的机器才能解析“数字APRS”，而这样的机器，可能只有自由通一家才有。

aprs你就理解成信令的一种，可以伴随发射接收进行传输，例如，有地方有APRS网管，收到信号后直接发到服务器上，登陆一些aprs地图就可以看到。

@"BloodBlade"#p17270 讲得很专业，学习了给楼主讲得通俗一点，模拟APRS就是一般的APRS，所有支持APRS的对讲机都能解码。数字APRS就是把APRS用DMR再加工一下，接收的机器既要能解析DMR，又要能解析APRS，所以其他人要买自由通878来解码你的信号。

APRS的发信息功能我至今没搞透，我在HT上向地图上看到的附近某个Call Sign发信息，有些人可以收到，也可以回复我，有些就不行，互收发不通....

模拟APRS是咱国内厂商造出来的词，你这样理解： “模拟APRS”=APRS "数字APRS"=自家品牌、非通用、半血APRS

数字APRS直接从互联网走上网模拟至少要先RF 然后在从某个网关走才能上网

@"BH6IDD"#p44125 BH6IDD您好，我是今天凌晨与您进行了DMR模式的中继通联的BH1NAF。我误以为您和我很近，是因为我这两天有印象APRS地图上我附近有另一位后缀为DD的6区友台，还以为是您。您可以查查看，也是挺巧。我在QRZ上找到了您，顺手提交了log，回头给您寄张QSL卡。

我用n76发aprs信号，自由通878二代plus可以解出，可是878发的aprs信号，n76解不出来不知道啥问题

Simulate APRS and Digital APRS?

BH2XIY

I don't understand the difference between simulated and digital APRS. How can I tell them apart? What are the advantages and disadvantages of each? Can they transmit and decode each other? Are the "Aiko" systems used by the dentist all digital or simulated?😂

BG1QGD

My personal understanding; I'm not sure if it's correct, but we can learn together.
APRS itself is a digital encoding, transmission, and decoding process for carrier waves.
APRS operates in F1D/F2D mode, where "F" represents frequency modulation, and the numbers indicate the number of channels. "D" signifies digital mode.
Therefore, there is no such thing as simulating APRS.
(What is referred to as "simulated personal understanding" involves using a simulated machine to transmit APRS carrier signals, but in reality, the simulator also requires a digital modem to perform encoding and decoding.)

BloodBlade

数字APRS是DMR厂家发明的的营销名词，实际上就是把定位发给DMR服务器，服务器替你把定位数据变成APRS数据发给APRS网络。缺点是大部分情况下位置信标只发不收，短信倒是可以和APRS网络互通。

模拟APRS是这些DMR厂家为了和上面的功能区分发明出来的，实际上就是原本的APRS。只不过1200bps模式使用声音传输数据(AFSK)，这种模式可以直接通过麦克风传输，所以兼容模拟FM机器，我猜这就是被叫做模拟APRS的原因。八重樱、建武、一众模拟APRS机器、普通机器在麦克风接口连接手机电脑或者小盒子都可以用这种模式互通。

还有一个是JARL开发D-Star协议时候发明的D-PRS，是在D-Star数据流里插入APRS信标数据，比DMR的“数字APRS”功能完善的多，APRS该有的功能基本上都有，但唯独缺了短信功能。iCOM的旧D*设备有限支持、新设备完整支持；建武的D*设备有限支持。

还有个非常非常罕见的情况，有的反射器可以对牙医所的数据流做“数字APRS”处理。

BG1QGD 1=不用副载波调制 2=用副载波调制，因为APRS的9600模式用GMSK调制，是F1D；1200模式用音频作为副载波调制，是F2D。同理短波APRS的300模式也用AFSK，应该就是J2D。

BI1NIZ

APRS is a digital signaling system that can be transmitted over analog channels.

BG4IJK

BloodBlade The presentation was very professional, and I learned a lot.

To explain it to the original poster in a simpler way,

Simulated APRS is essentially the same as regular APRS; all APRS-compatible radios can decode it.

Digital APRS essentially involves processing APRS signals using DMR, and the receiving equipment needs to be able to decode both DMR and APRS signals. Therefore, others would need to purchase a FreeTalk 878 to decode your signal.

WOLF-chiken

APRS can be understood as a type of signaling that can be used for transmission and reception, such as having an APRS network manager in a certain location who receives the signal and directly sends it to the server. Then, by logging into some APRS maps, you can see the information.

BA7NNC-JOE

I haven't been able to figure out the APRS message sending function yet. I sent a message via HT to a nearby station with a specific call sign that I saw on the map, and some people were able to receive and reply to me, but others couldn't. The two-way communication didn't work...

BH6IDD

"Simulated APRS" is a term coined by domestic manufacturers in China, and you can understand it as follows:
"Simulate APRS" = APRS
"Digital APRS" = Proprietary, non-standard, half-duplex APRS

Ken

BH6IDD Hello BH6IDD, I'm BH1NAF, and we made contact via DMR repeater this morning. I mistakenly thought that you and I were very close because I recently saw an APRS map showing another 6-zone station nearby with the "DD" suffix, and I assumed it was you. You can check your logs to see if there's a match. I found you on QRZ and submitted the log, and I'll send you a QSL card later.

BG2EFX

Digital APRS connects directly to the internet. Requires an internet connection.
At a minimum, it should first simulate RF and then connect via a specific gateway to access the internet.

BG7LRL

I transmit APRS signals using an n76, and the FreeTalk 878 Plus can decode them. However, when the 878 transmits an APRS signal, the n76 cannot decode it. I'm not sure what the problem is.

BI2SC

DE BI2SC, QTH, Dongcheng: I've noticed you're using APRS-IS but haven't received any messages. If you have some free time, let's meet up and do an eye ball QSO.

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