Questions tagged [aprs]

Automatic Packet Reporting System is a digital protocol used to transmit GPS position reports, telemetry, weather reports and text messages between APRS compatible devices and software.

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Looking for a Mic-E APRS encoding routine [closed]

I am looking for a Mic-E APRS encoding routine that is available for reuse in free and opensource software. I found many libraries and open source software offering Mic-E decoding, but never encoding. ...
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2 votes
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32 views

Easy Digi PTT circuit with Baofeng or Kenwood HT stays on after transmitting on VHF

I got my Easy Digi all wired up correctly, believe me, it took a while because of this issue. I've ruled out the FTDI controller I'm using because I can manually activate the optocoupler but supplying ...
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1 answer
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Direwolf APRS decoding unknown data

I've read the APRS spec, but can't for the life of me figure out where Direwolf is getting certain info. Looking at the output below: ...
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2 votes
2 answers
177 views

Some starter APRS question on the Yaesu FTM-300 radio

I have never done APRS before and recently got a Yaesu FTM-300 radio. I've read the APRS sub-manual for the radio and have also watched some APRS tutorial/setup videos for the radio. However at ...
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1 vote
1 answer
54 views

Map APRS data on Windows laptop using Kenwood D710's internal TNC

My D710G has APRS built in. How can I get that data displayed on a laptop?
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1 answer
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Feeding APRS data into GR Level 3

Our Skywarn group is looking for a way to feed the positions of our spotters (reported via APRS) to into GRLevel3 to be displayed on the map. Does anyone know of a tool for doing this, or ...
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#APRS error ? (only visible on aprsc status)

I'm playing with Nodered that I'm trying to use to place an aprs object: it works but it does not suit me! No error on findu.com, correct display of frames on aprs.fi or on aprsdirect.com ... but on ...
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1 answer
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Connecting Mobilinkd TNC2 to Mac for Xastir

I am not sure what to put in the TNC Port window on Xastir if I'm using a Mobilinkd TNC2. Xastir has directions for just this however, it is for Ubuntu Linux. https://xastir.org/index.php/HowTo:...
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2 answers
350 views

Can you receive GPS coordinates from a Garmin Astro dog collar on a handheld ham radio that has APRS?

I want to get a Garmin Astro 320 (or 430) which transmits GPS coordinates to a Garmin handheld unit on frequency 151.820-ish and 154.600-ish. But I would like to have the Garmin Astro GPS collar on ...
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3 votes
2 answers
105 views

Resources and guidance regarding APRS

I know getting my Technician License is the place to start, however, I have in my head a clear path that I want to achieve and am looking for guidance for the most efficient way to achieve that goal. ...
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4 votes
1 answer
190 views

String in APRS report

Here are two messages I received: ...
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1 vote
1 answer
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Why does the APRS specification suggest to use 7-bit ASCII for user-defined data formats?

The APRS specification document says the following: Although there is no restriction on the nature of user-defined data, it is highly recommended that it is represented in printable 7-bit ASCII ...
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0 votes
1 answer
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0X1C error on APRS.FI

I get a 0X1C error in APRS.FI and my beacon does not show on ui-view32. I am totally lost. Any idea what I am doing wrong? ...
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2 votes
1 answer
126 views

APRS: What's the `n` in WIDEn-N?

In every description I've found of WIDEn-N, the capital N is described as the "hop count" / "ttl" (comparable to internet ...
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6 votes
1 answer
262 views

What's the difference between an APRS "item" and an APRS "object"?

What's the difference between an APRS "item" and an APRS "object"? A kenwood manual says Objects have timestamps, items do not. What does that mean, and how should it be used? Also in general: What ...
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0 votes
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Required receiver for HX-1 (144.390 MHz) & NEO-6M GPS Module?

Context I'm launching a series of weather balloons as a capstone graduation project. Right now I am in the process of building the payload. I have been going over the different components of the ...
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1 answer
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Had +5VDC and GND swapped, feeding a GPS receiver. Source is +5VDC output @ DB9 port on Yaesu FT-2600M, now showing 0V. Did I fry something?

Basically, I connected +5VDC to the ground of a GPS receiver, and now have no power from the power source. Is it possible to mess something up by doing this? I feel like this is more of a basic ...
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1 vote
1 answer
118 views

How to connect MX614 to an ATmega 328p and a DRA818V to make an APRS transceiver

I am in a process of making a nanosatellite on which I am considering putting an APRS digipeater. I know about micro-modem based on ATmega 328P but it is pretty power hungry. MX614 has really good ...
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3 votes
1 answer
256 views

Fetching data from APRS-IS.net

I would like to fetch the data transmitted by a specific radio station from APRS-IS.net servers. I've read the documentation on their site and it is not clear how you would do it, if you are fetching ...
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1 vote
2 answers
396 views

Direwolf sends APRS transmission but it isn't being picked up by local digipeaters

I'm new to APRS and trying to setup a RaspberryPi APRS GPS Tracker. I've installed Direwolf and configured it, my transceiver transmits the signal, and I've decoded it with GQRX via an RTL-SDR and I ...
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3 votes
2 answers
799 views

RTL-SDR dongle - what antenna should I use for APRS receive only?

I was following this guide to setup an iGate using an RTL-SDR dongle and a Raspberry Pi. It worked, and I have been able to test it by seeing some APRS packets from a separate transmitter (Arduino+...
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1 vote
3 answers
259 views

ax.25 error shown in direwolf. Fails on channel 8, then 2, then works

Using a Raspberry Pi 3B, Signalink, HT, direwolf and ax25-tools and ax15-apps. All up to date. Clean start. Commands: ...
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2 votes
1 answer
51 views

In HLDC framing/Bell202 encoding, are the flag bytes NZRI encoded?

I have previously implemented an APRS transmitter from scratch by manually generating the modulated sine wave. In this implementation, I did NZRI encoding over the entire packet (including postamble ...
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6 votes
1 answer
498 views

Using Direwolf with multiple radios?

I'd like to play around with ax.25 connections. It seems that if I have more than one radio (operating on different frequencies) that I would want to have multiple ax.25 interfaces. Direwolf creates ...
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2 votes
3 answers
994 views

Connecting TNC-Pi to Kenwood TM-241A

I am looking into connecting a TNC-Pi to a Kenwood TM-241A for AMPRNet operation. I thought it was going to be fairly straightforward as each pin on the TNC-Pi seemed to have its own analogue on the ...
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5 votes
1 answer
780 views

Help understanding the information field in an APRS-IS message

I'm looking at the raw packet data from http://aprs.fi. I see packets such as these: ...
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2 votes
1 answer
608 views

APRS - using 100 Hz CTCSS for voice contacts

I've learned online some very thin information about how many hams will use 100 Hz CTCSS tones on their APRS transceivers to be able to make voice contacts with hams who are also using APRS. I've ...
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3 votes
2 answers
327 views

What is the legality of data modes over UHF/VHF in the US?

Cheap & simple transceivers are readily available online that allow you to transmit serial data over UHF/VHF frequencies such as 433MHz (approximate range of 1000m). It seems that these are ...
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4 votes
2 answers
285 views

Wireless temperature data logger in the USA on 433MHz

I'm a newly licensed ham tech. I am trying to figure out if I am doing everything correctly to setup a wireless temperature monitoring station that uses the 70cm band (specifically 433.4MHz) in the ...
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2 votes
2 answers
1k views

Building a portable APRS iGate/digipeater

I've been experimenting with APRS for the last year or so. There are a lot of areas that I go that don't have digipeaters or iGates. (Luckily, I live about three blocks from one, so around home I'm ...
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3 votes
1 answer
124 views

APRS: what is with stations clustered in the middle of a lake?

I just recently started using APRSdroid, and I've been just looking at maps, and I've noticed that in my area there are spots with just a cluster of stations on top of each other (in this specific ...
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7 votes
3 answers
2k views

Is there a difference between AFSK and FSK for AX.25/APRS USE?

APRS uses the AX.25 protocol which assumes the Bell 202 AFSK modulation scheme to generate the actual radio signal. Is there any reason the same signal can't be generated directly with FSK without ...
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0 votes
1 answer
373 views

Yaesu FT-8800 + TinyTrak4

I´m using the Yaesu FT-8800 with the Byonics TinyTrak4 as APRS tracker in my car. There is a menu setting to bind the data jack to a VFO, but transmission is always done using main VFO. So if I talk ...
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0 votes
1 answer
228 views

Kenwood TH-D72 Freeze on Splash Screen

Some friends and I recently placed a Kenwood TH-D72 on the summit of Saddle Mountain in Oregon, USA, and set it up as a temporary digipeater for use with APRS. The TH-D72 successfully digipeated ...
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5 votes
1 answer
1k views

AX.25 on macOS (aside from APRS)

I'd like to send raw AX.25 packets from a macOS PC using a KISS TNC (mobilinkd TNC2). I've sent APRS packets with this set up using Xastir, but I'd like to send other information besides just APRS (i....
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10 votes
2 answers
2k views

APRS digi path for ISS digipeater?

So when I try to work the ISS digipeater, what should I set the digi path to be? My setup is a 5 W HT with a 2 m yagi connected to my phone with APRSDroid. I've tried the past few nights with ...
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2 votes
1 answer
462 views

Use amateur radio frequencies for commercial purpose

Can I use amateur radio frequency for commercial purpose (after acquiring ham license), expecting that it would be congestion free band and give me good broadcasting performance compared to other ...
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2 votes
1 answer
269 views

FET for low voltage class E amplifier

I'm building a small APRS radio for a high altitude balloon, and I'm thinking of using an Si570 (3.3 V CMOS) at 144 MHz to drive a small class E amplifier. I'm looking for about 1W output power. I'm ...
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4 votes
1 answer
909 views

What are the best APRS SmartBeaconing™ settings for different modes of transit?

There are a variety of websites that give sample SmartBeaconing™ settings – mostly for automobiles, but some for bicycles and pedestrians. I've tried several of these settings and had mixed results. ...
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4 votes
1 answer
373 views

ISS APRS Digipeater with Kam XL and ICOM IC-910H

I am trying to use the ISS APRS digipeater which transmits at 437.55MHz. Hardware setup consists of the following ICOM IC-910H. The transceiver has been connected to a Windows PC running a HAM ...
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3 votes
2 answers
467 views

Can I use my call sign in APRS tracker abroad?

I am planning a car expedition from the EU to the China, through a lot of countries in the east. I am interested in if I can use an APRS tracker with my call sign issued in the Austria.? And the ...
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2 votes
0 answers
175 views

It is allowed to have more APRS trackers with one callsign in Europe Union

I am interested if I can set up all my automatic APRS GPS trackers with one call sign in Austria (like in the US)? Are there any restrictions on usage?
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2 votes
3 answers
2k views

Can I use APRS over TCPIP without ham license?

Simple question, but for me is really important. "Can I use the APRS over TCPIP without a ham license in Europe Union (especially in Austria)?" I consider yes, because I am not transmitting with radio,...
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0 votes
1 answer
345 views

Should I have a license for APRS on my company car fleet

I am thinking to equip every car in my company with APRS tracking device from amazon. I would like ask if I have to have a HAM license for it. If yes, than for which person — I am not driving those ...
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11 votes
2 answers
3k views

How to do APRS in real wilderness?

I'm a relatively new ham (licensed a couple of years ago, occasional activity on 70cm and 2m, mostly repeaters). I'm looking to extend my ham experience and am interested in digital and packet modes. ...
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1 vote
1 answer
197 views

What issues can I expect when using Bluetooth for packet radio?

So I have an IC-2730, which doesn't have external inputs for packet radio, but it does have optional board for Bluetooth connectivity and there's also an optional Bluetooth headset for it. I'm trying ...
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1 vote
1 answer
85 views

Mobile Phone offline maindenhead or mgrs web app [closed]

I read an article in a magazine or online about a (.gov, I think) site which showed two, four to six character sequences in a mobile phone browser window. The letters from left to right indicated ...
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8 votes
1 answer
3k views

Help understanding path taken by APRS packet

I'm looking at some raw APRS packets over APRS-IS. I'd like to determine which stations heard particular packets, but I'm having trouble understanding how TNC-2 paths work. Here are two examples: <...
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  • 639
1 vote
1 answer
258 views

What is 1700 in SoundModem by UZ7HO?

As a red circle in the picture, What does 1700 number means? When I change it to another value seems like it can not decode APRS sound. So what is it(1700 in textbox after ChA label)?
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4 votes
1 answer
1k views

What does the APRS 'to'/destination address mean?

I'm looking at incoming packets. Here's the beginning of a few messages: ...
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