Questions tagged [packet]

Questions related to sending digital data over amateur radio including hardware, protocols, and related software.

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votes
1answer
47 views

Find the right COM to setup Winlink

I managed to successfully install Winlink on my Ubuntu operating system but it is not completely functional yet. I don't know which COM my computer is set up to use, and there are a lot of them ...
2
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1answer
161 views

Raspberry Pi with TNC-Pi - How to Connect to BBS

I am brand new to AX25 on a Raspberry Pi with a TNC-Pi and Baofeng UV5R. I have a BBS at WE1CT-4 which is line of sight at 3 miles. Do I just axcall 1 WE1CT-4. and the BBS will magically appear (if ...
6
votes
1answer
210 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 ...
5
votes
1answer
183 views

Are there any Alternatives to Packet Radio for sending digital data?

Recently, I asked a question about using an Arduino to send packet radio. I noticed that the top record speed for packet radio is 1 megabit/second, on a modified radio. Someone mention on stack ...
1
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1answer
427 views

Using a Baofeng UV-5R V2+ as a Portable Packet Radio

So my idea is I might use a keyboard to enter text. I would use an Arduino to control the ham radio. The problem is that I have no idea on how to use the Arduino to control the radio. Also, what ...
7
votes
3answers
467 views

LoRa radio transceiver for PtP mesh?

I am very new to general RF/radio in general other than basic WiFi, but I'm looking at the feasibility and cost of a long range (>200M between nodes, sometimes probably 500+M) in flat terrain, ...
1
vote
1answer
155 views

AX25 + Reed Solomon : Bit stuffing errors

I'm currently working with a satellite that has AX.25 + Reed Solomon code (truncated RS(255,223)) in GNU Radio. Since there is no frame synchronization pattern, the 0x7e flags are used for frame ...
3
votes
1answer
121 views

Are packet BBS discussions archived anywhere?

Now that the once-extensive network of AX.25 BBSs is all but gone, I'm wondering whether there exists any archive of the many public discussions that took place there. It seems sad to think that the ...
2
votes
1answer
577 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....
1
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0answers
131 views

Information on GSM [closed]

My team and I are using a SDR, GNU Radio, and some other hardware assembled into a custom tablet and a Python program we are writing to detect IMSI Catchers. I have some Packet Capture files with ...
2
votes
3answers
455 views

Packet Radio at 100 miles [closed]

I am wanting to assemble a Packet Radio solution that will allow for packet radio transmission with a range of about 100 miles or better. I am not sure what band to use, what radio to use, what ...
1
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2answers
129 views

V/U Packet Rate Limits

I'm studying for the General exam and I've encountered some questions about maximum baud rates on various bands. They seem... extremely optimistic. Given the trouble I've had investigating 9600 baud ...
5
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1answer
262 views

Why does the FCC put restrictions on symbol rates?

This answer claims that Mostly, on HF, the FCC has chosen to limit modes of transmission and symbol rates rather than bandwidth Why does the FCC limit symbol rates?
0
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1answer
121 views

Using 'amodem' to transfer digitally using a UV5R

I reviewed docs for amodem, and it looks like I can send files and possibly other things with this. I should only need to prep my computer as per the doc and set VOX correctly. Does anyone have ...
1
vote
1answer
115 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 ...
7
votes
6answers
11k views

Is packet radio possible on Baofeng UV-5R and similar HTs?

I am curious to know if it is possible to do packet radio on VHF/UHF using the UV-5R... I have seen some invasive hardware hacks, but without modifying the radio itself (firmware, hardware) it's my ...
11
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4answers
7k views

How To Join Packet Radio BBS

I'm a complete newbie here, and on the Southeast Coast of the USA. I don't even own a ham radio yet. Some preppers and I got to talking about a dystopian time of Internet collapse where shortwave ...
1
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0answers
186 views

Kenwood D710G TNC Won't Monitor ID Packets?

I recently got a Kenwood TM-D710G and have been experimenting with using its internal TNC connected to a serial port on my laptop for packet / PBBS operation. I can connect to PBBSes whose callsigns I ...
5
votes
1answer
208 views

Use ham to broadcast GPS RTK correction data

I am involved in a precise positioning project that uses Real Time Kinematic (RTK) for cm-accurate positioning. We use unattended base stations that provide real-time corrections for mobile rovers. ...
2
votes
1answer
130 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 ...
3
votes
2answers
805 views

Ideas for a simple VOX circuit for packet?

I want to build a simple circuit, preferably only a few transistors which simply activates when it hears a low level audio, and deactivates when the audio signal does not exist anymore. No pre-delay ...
5
votes
2answers
207 views

Can IMAP email be used for packet radio?

I just barely learned that IMAP is a protocol that allows you to read and respond to emails without using the internet. Would it be possible to use this application for packet radio and if so, how? I ...
3
votes
1answer
463 views

How to setup packet BBS?

Here is my goal: To be able to talk to my friend using packet even when He or I are not there using a saving to TNC technique. We live only a few miles away from each other, and have a good signal. ...
1
vote
1answer
62 views

What is the forward protocol for FBB?

Does anyone know the forwarding protocol used by FBB? I am working on a program in C# and looking for the protocol to make compressed forwarding etc.
7
votes
4answers
6k views

What frequencies should I listen to for packet radio?

I just obtained a really old packet TNC and hooked it up to the computer, and it appears to work. Is there a standard packet calling frequency on 2 meters? I would like to see if there is packet ...
3
votes
4answers
8k views

How can I decode an AFSK 1200 baud audio clip? (ISS)

I'm a new ham. The past few days, I've had a few nearby passes of the International Space Station. As it was going overhead, I managed to record what I believe to be 1200 baud AFSK transmissions from ...
2
votes
2answers
202 views

What is this signal I've recorded?

I've recorded what I believe packet radio signal. I tried few decoding tools on windows to no avail. Can anyone please have a look at this youtube video and tell me how to decode this signal or what ...
6
votes
2answers
601 views

1200 baud packet radio can't communicate

I'm toying with a simple 1200 baud packet radio I built. I'm attempting for it to be compatible with APRS, which uses the Bell 202 signaling, 1200Hz for mark and 2200Hz for space, which I assume map ...
4
votes
1answer
709 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 ...
5
votes
1answer
2k views

Can a Yaesu FT-7900R be physically connected to both KPC-9612+ ports?

The Yaesu FT-7900R has a single data port (mini DIN 6-pin) for 1200 and 9600 bps TNCs. Page 10 of the manual states: In accordance with industry standards, the signal levels, impedances, and ...
5
votes
1answer
296 views

Where is the Multi-Drop XKISS / BPQKISS spec?

In packet radio, AX.25 is a fairly common layer-2 protocol. Many TNCs implement AX.25 in firmware, so the operator interfaces to the TNC with a serial port, using the TNC's firmware from a shell-like ...
5
votes
1answer
141 views

APRS: WIDEn-N vs. TRACEn-N

The suggested APRS digipeater path is WIDE1-1,WIDE2-1 for the most use cases. According to the specs, this ensures two retransmissions by fill-in / regular ...
10
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1answer
4k views

How do I discover APRS coverage?

I'm considering adding simple APRS transmitters to my vehicles. I'd rather just put one in and forget about it, but I understand there are areas of the US where a stronger transmitter would be ...