Difference between revisions of "Talk:HamRadio"

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* An in-depth walkthrough of GQRX
* An in-depth walkthrough of GQRX
* How ZMQ sockets work
* How ZMQ sockets work
* Spread-spectrum

Revision as of 16:31, 9 February 2021

Notes about the video meetings

Saturday 17 October 2020, 20:00 UTC

After some technical difficulties with Big Blue Button, we moved to Zoom and succeeded in doing the planned agenda:

  • Presentation of gr-RTTY-basics package
  • Audio loopback demo
  • Live Over-the-Air demo

The time (20:00 UTC) proved to be too late for participants East of Greenwich, so an earlier one was scheduled for 7 November.

Saturday 7 November 16:00 UTC

The meeting followed the agenda above. There was a minor audio difficulty with the loopback, but I proceeded to present the Over-the-Air demo successfully.

View the presentation on https://www.youtube.com/watch?v=_HmbRk-UG8Q

Saturday 12 December 2020 16:00 UTC

Subject: Transmit / Receive switching and station control
Presenter: Gavin Jacobs VE7GSJ

  • Requirements for TX/RX switching
  • VE7GSJ Solution (hardware & GNURadio Companion)
  • Demo on 2m repeater


Thanks to Gavin for an excellent talk. It can be viewed at https://www.youtube.com/watch?v=rTp6vQk5MqE

16 January 2021 16:00 UTC

Subject: Using GRC to build radios: Make the flow graph work for you

Presenter: John Petrich W7FU


  • Getting started with GRC
  • Basic flow graph workspace organization
  • Flow graph details
  • Data flow problem solving
  • Practical odds and ends for real radios
  • Group discussion


Thank you to John for a very informative presentation. It can be seen at https://youtu.be/j8OeK7c_zAU

27 February 2021 16:00 UTC

Subject: A Look at Project 25 (P25) Digital Radio

Presenter: Aaron Rossetto, NI

Agenda: In this presentation, I will introduce Project 25 digital radio, with a strong emphasis on its use in North American public safety trunked radio systems, and to describe experiments monitoring and decoding P25 traffic using GNU Radio code.

  • What is Project 25?
  • A brief introduction to trunked radio
  • Diving into the P25 protocol
    • Modulation
    • Packet framing and encapsulation
    • Packet types
  • GNU Radio and P25 decoding experiments

Here is the link to this meeting:


20 March 2021 16:00 UTC

Remember that Daylight Saving Time will have started in the U.S.

Subject: Ground Station Test Transceiver

Presenter: Ray Roberge WA1CYB


  • What is this Ground Station Test Transceiver ?
  • Architecture – Three Sections
    • Receiver flowgraph
    • Transmitter flowgraph
    • Telemetry flowgraph
  • GUI displayed with a ADALM Pluto SDR
  • Over the Air results as received on a ETTUS B205mini on SDR-Console software
  • Discussion on finer points of Packet telemetry
  • Same flowgraph modified for UHD, Ettus B205mini and why you need to modify it
  • QT display , GRC 3.8.2 / 3.8.0 minor issues noted
  • Discussion


Questions and Suggestions for future meetings


  • The Ham Radio chat room on Matrix is available for follow-up and continuing discussion.
    • server: https://chat.gnuradio.org
    • or via the Homeserver in a matrix app: gnuradio.matrix.ungleich.cloud
    • room: #HamRadio:gnuradio.org
  • Questions about meetings also can be sent to "duggabe@dcsmail.net"

Suggested topics

  • Transmit hardware to operate below 50 MHz.
  • amateur radio satellite service
  • FreeDV
  • Contact ISS
  • EME - moon bounce communications
  • How to implement JS8, JS8-Call, and FT8 in GR
  • An in-depth walkthrough of GQRX
  • How ZMQ sockets work
  • Spread-spectrum