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6 votes

How to distinguish SDR 820T and 820T2 dongles on Linux?

The R820T and the R820T2 differ. The R820T can set a narrow IF filter (300 kHz) - but not if the gain is set at maximum. The R820T2 can not set a narrow filter - minimum bandwidth is about 800 kHz. ...
sm5bsz's user avatar
  • 1,009
5 votes
Accepted

Linux based SDR spectrum capture via CLI

What are the best hardware options for this considering the bandwidth and frequency requirements and availability of stable linux drivers. (I was thinking one of the SDRPlay family of devices but ...
Marcus Müller's user avatar
4 votes

How can I program a Baofeng BF-H7 on Linux?

According to multiple pages I found (among which this page), the radio should be programmable with Chirp if you use the settings for the Radioddity GA-510. A couple ...
Dieter Vansteenwegen's user avatar
4 votes

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

In absence of a clear indication of what Amateur Radio band is being targeted here, an answer for the 13 cm band: You can use 802.11g/OFDM with a 20MHz bandwidth on 2400-2450 MHz Amateur band. You ...
Edwin van Mierlo's user avatar
3 votes
Accepted

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

This is issue #42 on Direwolf's GitHub page. https://github.com/wb2osz/direwolf/issues/42 To work around it, put the interface into CRC mode "none" with a command like this: ...
Mike Playle's user avatar
3 votes
Accepted

How to distinguish SDR 820T and 820T2 dongles on Linux?

As far as I read the rtl_sdr source code, no, there's no special case for anything called "820T2"; the relevant file is rtl_sdr.h: ...
Marcus Müller's user avatar
3 votes

Linux based SDR spectrum capture via CLI

4 Raspberry Pi's each with an RTL-SDR dongle may well be cheaper than just one of the higher bandwidth SDR capture devices or a high end Linux PC. They run Linux. Network them together, with each ...
hotpaw2's user avatar
  • 13.5k
3 votes

Can only use WSJTX in sudo

I would guess that your user is not in the dialout group. You can fix this with: sudo adduser your_user_name dialout Then log out and back in.
user3486184's user avatar
  • 1,957
2 votes

Ham radio listener is split up on old hardware

The odd thing is it wasn't showing all memory used or excessive load (1.37) If I remember correctly, the Pentium IV is a single-core architecture with the option for Hyperthreading, which really is ...
Marcus Müller's user avatar
2 votes

How to run chirp with python3-based system (workaround found now)

a quick google of "install python 2.7 on Ubuntu Mate 20.04" gives this article as the top result, How to install Python 2.7 on Ubuntu 20.04 LTS Here's an abbreviated list of steps from that ...
webmarc's user avatar
  • 4,241
2 votes

nrparms: SIOCADDRT: Inappropriate ioctl for device

Looking at the kernel code, I see four things that can make an "add node" ioctl on a netrom socket return -EINVAL: The route has more than 8 digipeaters. ...
hobbs - KC2G's user avatar
  • 12.5k
1 vote

Use Direwolf for ax.25 connections w/o kernel support?

Sort of, yes, if you have userspace programs that speak AGWPE or KISS rather than trying to create their own kernel ax25 sockets. KISS is basically just an encapsulation for raw AX.25 packets, so a ...
hobbs - KC2G's user avatar
  • 12.5k
1 vote

Ten Tec Argo IV wont connect to Fldigi on R Pi

If you don’t see ttyusb0 when you plug the radio into a Linux machine, but the COM port appears when you plug it into a Windows machine, then it sounds like you need to find a Linux driver for the USB-...
Scott Earle's user avatar
  • 4,619
1 vote

Can only use WSJTX in sudo

Probably, some or all files are owned by root. Chown the files and change the ownership to yourself, for example.
Mike Waters's user avatar
  • 8,071
1 vote
Accepted

Cancel beacon on AX.25 Linux Stack

Use beacon killall. This will kill all your beacons if you have more than one. If you want to keep one of several beacons, you will have to restart them manually. ...
Joshua's user avatar
  • 61
1 vote

QSSTV on Linux Mint

I once successfully used QSSTV on Linux Mint for displaying digital pictures. However, at some point after upgrading LM it ceased working correctly. It would just not lock onto a signal anymore. But I ...
Mike Waters's user avatar
  • 8,071
1 vote
Accepted

Find the right COM to setup Winlink

If you're running under WINE, you can make the port whatever you want. You need to know the Linux device name (like /dev/ttys0 or /dev/ttyUSB or whatever) the TNC is plugged into on the computer. ...
Duston's user avatar
  • 939
1 vote

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

this is not a direwolf issue. this is an issue with the ax0 N_KISS line dicipline for tty/pty's of the linux kernel. indeed. first packet -after you bring an ax0 interface up- has KISS control byte 80 ...
HRH Sven Olaf of CyberBunker's user avatar
1 vote
Accepted

How do I install the DV4mini software on Ubuntu?

The very first link on the German website leads to a .zip file: link. That zip file only contains the installer. You'll have to run the installer using wine (Wine ...
Marcus Müller's user avatar
1 vote
Accepted

Linux RTL-SDR waterfall via the command line

This is actually implementable, as specified, but you may have to code your own app. I wanted to measure whether 2 signals were present. So I ran rtl_tcp on my Pi 3 to serve RTL-SDR IQ samples over ...
hotpaw2's user avatar
  • 13.5k
1 vote

Linux RTL-SDR waterfall via the command line

You didn't specify the OS of the client from which you would like to view the remote session. On the Pi side, use the built in RealVNC to allow remote access. If your remote client is Linux based, ...
Glenn W9IQ's user avatar
  • 18.6k
1 vote

How to use a Linux computer as a paddle key code practice oscillator

This page appears to be what you're looking for. This technique uses the Linux LV2 plugin. You'll have to build an interface with a 555 timer chip. SETUP: an UltraPico Keyer, keys a 555 TIMER CHIP.....
Mike Waters's user avatar
  • 8,071
1 vote

How to use a Linux computer as a paddle key code practice oscillator

Here is a solution that has been tested and works on Ubuntu 14.04 LTS. The software used is called Didadah. [PDF info] The paddles connect via a standard FTDI-based USB-A Male to DB9-Male Adapter ...
SDsolar's user avatar
  • 2,089

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