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.
62
questions
4
votes
1answer
300 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 ...
1
vote
2answers
162 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 ...
2
votes
1answer
52 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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2
votes
1answer
79 views
1
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1answer
42 views
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
...
0
votes
1answer
46 views
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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3
votes
1answer
56 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 ...
2
votes
1answer
54 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 ...
0
votes
2answers
61 views
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 ...
2
votes
1answer
153 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 ...
4
votes
1answer
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....
0
votes
1answer
49 views
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 ...
1
vote
1answer
74 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 ...
1
vote
2answers
237 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 ...
4
votes
1answer
800 views
How can I generate a list of APRS IGates on 30m?
I am investigating using a Tiny Trak 4 with my portable HF radio to self-spot on SOTA activations via APRS on 30m.
I usually self-spot via a text message. When I don't have any cell coverage, I can ...
2
votes
2answers
475 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+...
3
votes
3answers
2k views
How do I connect a GPS receiver to a radio for APRS?
I volunteer with the local search and rescue group as a team medic and a radio operator. The team is new and recently decided to go with the Garmin 64st as our go-to GPS units. Those of us with ...
4
votes
1answer
191 views
Using a flip-phones GPS NMEA data for the GPS in an APRS station
I have heard that it is possible to connect certain flip-phones to external devices via their Micro USB port and, through the USB port, send the NMEA location Data from their internal GPS to an ...
9
votes
3answers
1k views
When is APRS use considered commercial?
I've heard that APRS is only allowed for non-commercial use. I was thinking of a building a weather station that uploads data via APRS (so far, non-commercial). If I then include data from that ...
1
vote
1answer
167 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:
...
3
votes
2answers
915 views
Linux APRS client
I have an old PK-232 packet TNC which is spitting out APRS data from 144.390 to the serial port. I have confirmed this with minicom and see all sorts of data with lat long etc.
I would like to view ...
2
votes
2answers
788 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 ...
1
vote
1answer
83 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 ...
2
votes
1answer
45 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 ...
6
votes
1answer
357 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 ...
7
votes
2answers
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 ...
5
votes
1answer
510 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:
...
2
votes
3answers
703 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 ...
2
votes
1answer
435 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 ...
16
votes
2answers
1k views
Is there a disadvantage to using a cheap HT for APRS?
Looking to build a cheap (not even inexpensive, just dirt cheap) APRS beacon transmitter. Right now you can get a dual band handheld transceiver with rechargeable battery, antenna, etc for under $31 [...
5
votes
1answer
622 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. ...
3
votes
2answers
283 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 ...
4
votes
2answers
222 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 ...
2
votes
3answers
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,...
3
votes
1answer
115 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 ...
6
votes
3answers
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 ...
0
votes
1answer
291 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 ...
0
votes
1answer
195 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 ...
2
votes
1answer
378 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 ...
2
votes
1answer
229 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 ...
2
votes
0answers
164 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?
4
votes
2answers
408 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 ...
1
vote
1answer
256 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 ...
2
votes
1answer
169 views
Where to pull audio for packet on an alinco DR-600
I have an old Alinco dual-band radio, the DR-600 (service manual) (manual)
I want to use this radio for receiving APRS packets. The speaker audio out Works but there are too many things to go wrong ...
1
vote
1answer
149 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 ...
10
votes
2answers
2k 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.
...
4
votes
2answers
365 views
AX.25 to Kenwood $PKWDWPL sentence
In my vehicle, I have a Byonics TinyTrac4 paired with an AvMap G6. I also have a Kenwood TM-D710 that I'm currently using for voice. I live in a region of the US where both 2m APRS and 70cm High Speed ...
6
votes
1answer
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:
<...
1
vote
1answer
216 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)?
3
votes
1answer
944 views
What does the APRS 'to'/destination address mean?
I'm looking at incoming packets. Here's the beginning of a few messages:
...
