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FreeDV

TAPR Mini-DCC Video Now Online

December 17, 2023 By Dan KB6NU Leave a Comment

TAPR held what they called a virtual Digital Communications Conference, or “mini-DCC,” on Saturday, December 9. The recording of this event is now on YouTube, but you can play it right here, if you like.

All of the talks are included in this 4+ hour video. They include (with the times at which they start):

  • 14:00 – TAPR Issues and Updates, Dave Larsen KV0s
  • 26:50 – Moving to High Throughput Interfaces, Dave Witten KD0EAG
  • 53:50 – GERT: A Low-Cost GNSS Frequency Reference, John Ackerman N8UR, George Byrkit K9TRV
  • 1:09:45 KA9Q-Radio: Update and Demonstration, Phil Kart KA9Q
  • 2:12:30 Digital Voice Over HF: Codec2 and FreeDV, Walter Holmes K5WH
  • 3:15:15 Introducing ezDV, Moorer Salem K6AQ
  • 3:54:00 ESP32-APRS Tracker, APRS Mini-Tracker, and LoRA, Jason Rausch K4APR

These talks are all pretty interesting and worth watching if you’re interested in some of the new things going on in digital communications.

Filed Under: Digital Communications, Software-Defined Radio (SDR) Tagged With: APRS, Codec2, ezDV, FreeDV, KA9Q, TAPR, TAPR DCC

ICQ Podcast #399 – Hamzilla 2023

March 26, 2023 By Dan KB6NU Leave a Comment

In this episode, I joined Martin Butler M1MRB, Caryn Eve Murray KD2GUT and Edmund Spicer M0MNG and discussed the following topics:

  • Echo of BBC’s first broadcast in Scotland 100 years ago is heard from centenary event at Pacific Quay

  • Steubenville-Weirton Amateur Radio Club Donates Books to Library System

  • Is there a Better Way to Safeguard Vital Repeaters?

  • In the Car, Podcasts and Online Audio Continue to Grow

  • FreeDV Aims to Bring Open-Source HF Digital Voice Into the Mainstream

  • Astronauts from UAE Taking on Space Education

The episode’s feature is about Hamzilla 2023, a hamfest in the U.K.

Hams actually listen to us?

I’m always pleasantly surprised when I run across hams who say that they listen to the podcast. Mostly, it just seems like we’re babbling when we record the podcast, but when people say that they enjoy listening to it, it makes doing it all worthwhile.

Last week, at the HamSCI Workshop, I introduced myself to a fellow who said, “I know who you are. I recognized your voice from the podcast.” We proceeded to have a really nice conversation about the workshop.

Last night, I worked someone on 30 meters, and my being on the podcast made it possible. He emailed me after contact saying, “I’m a new CW operator and I heard your call tonight and recognized it from podcast fame, so I answered. I appreciated that you slowed down right away, but I immediately regretted my decision when you sent more than RST and state.” That is to say that he probably wouldn’t have answered my CQ if he hadn’t recognized my call sign.

I replied, “I could tell that were a bit unaccustomed to ragchewing, but kudos to you for trying!” I went on to say that I hoped that he should feel free to call me anytime. The only way to get better, after all, is to make contacts. I hope that I get to work him many times in the months ahead.

I’ll extend that invitation to all of you. If you ever hear me on the air, or see me at an amateur radio event, please feel free to say hi.

Filed Under: Clubs, Digital Modes, SWLing, VHF/FM/Repeaters Tagged With: BBC, FreeDV, libraries

FreeDV Development Continues

May 9, 2019 By Dan KB6NU 1 Comment

I don’t normally just repost news from other blogs, and I’m not a big phone operator, which you know if you regularly read this blog, but for some reason, FreeDV interests me. As reported in this blog post, David, VK5DGR; Brad, AC0ZJ; and Richard, KF5OIM, are continuing to work on and improve it. They’re calling their latest effort FreeDV 2020.

David writes:

The new FreeDV 2020 mode, uses LPCNet Neural Net speech synthesis technology developed by Jean-Marc Valin. The goal of this mode is 8kHz audio bandwidth in just 1600 Hz of RF bandwidth. FreeDV 2020 is designed for HF channels where SSB an “armchair copy” – SNRs of better than 10dB and slow fading.

FreeDV 2020 uses the fine OFDM modem ported to C by Steve (K5OK) for the FreeDV 700D mode. Steve and I have modified this modem so it can operate at the higher bit rate required for FreeDV 2020. In fact, the modem can now be configured on the command line for any bandwidth and bit rate that you like, and even adapt the wonderful LDPC FEC codes developed by Bill (VK5DSP) to suit.

The video below demonstrates its use over a 3,200km path between Adelaide, South Australia  and the Bay of Islands, New Zealand. A KiwiSDR is being used to receive and decode the transmission.

I love it that these guys are continuing to push the boundaries of digital voice on HF. Who knows? Maybe one day we’ll all be operating DV and SSB will relegated to a small subband where the vintage radio guys hang out.

Filed Under: Digital Communications Tagged With: FreeDV

From my Twitter feed: Scope tips, GPS 10 MHz reference, digital voice

September 6, 2015 By Dan KB6NU Leave a Comment

TeledyneLecroy's avatar
Teledyne LeCroy @TeledyneLecroy

Some everyday #oscilloscope tips from our Test Happens Blog: lcry.us/1NuPZ4X 5 pic.twitter.com/QrYcPcpiNP

LA3ZA's avatar
Sverre Holm, LA3ZA @LA3ZA

First test of Ublox Neo-7M GPS 10 MHz output as @elecraft K3’s reference seems successful – 12$ #GPSDO, #hamr pic.twitter.com/3cwn8RqH56

ke9v's avatar
Jeff Davis @ke9v

Hams Talk Digital via @hackaday hackaday.com/2015/09/06/ham… #hamradio

Filed Under: Digital Communications, Test Equipment Tagged With: FreeDV, GPS, oscilloscope

What new amateur radio gear would you like to see?

June 17, 2015 By Dan KB6NU 12 Comments

My friend, Tom, WB8COX, emailed me today, commenting on my post about Dayton. He wrote:

I always find it interesting what some people focus on at Dayton or similar events compared to my observations.

I agree that the K3S, an upgrade to the Elecraft K3, and the Maestro, a PC-based front-end for the FlexRadio software-defined radios, shown below, were probably the high points. It’s sad that an upgrade and a radio front panel were significant.

flex-maestro

I was disappointed in Yaesu and their Fusion system. I asked them about linking repeaters and they sent me over to one of the DStar support booths.

One item, which was previously announced is that Kenwood is going to offer DStar sometime probably next year. While many dismiss DStar, it has slowly gained traction, especially in the south. What is really helping is the ability to set up linked repeaters, much like the one using analog in Michigan, essentially at the push of few buttons.

The big issue for many is the cost of equipment. Traditional analog radios, now made in vast quantities in China are very inexpensive. Any radio that has current IP (i.e patented) technologies is 2 to 10 times more expensive.

Those are my thoughts. I had more fun at FDIM than wandering around the hamfest.

I hadn’t thought about it before, but it does seem a little sad that the big product announcements were a couple of upgrades. Maybe this is just a slow year, though, and next year we’ll see a flood of new product announcements. One of the thoughts that I had is that it would be nice to see digital voice, a la FreeDV as a standard feature on HF transceivers. I’d like to see a really open-source type transceiver, too.

What kind of new products or new product features would you like to see? It doesn’t have to be radios. It could be accessories and other gadgets, too.

Filed Under: Gear/Gadgets Tagged With: Elecraft, FlexRadio, FreeDV, K3

From my Twitter feed: FreeDV, W3EDP antenna, IARU on WRC-15

May 30, 2013 By Dan KB6NU Leave a Comment

I haven’t been a big advocate of digital voice (DV), but I’m beginning to think it might be fun.

ke9v
Saw a little FreeDV love on Planet Ubuntu in the form of this post. Nice job by 9M2PJU.http://t.co/bdlzFMKVKU #hamr

 

Also, see My Favorite Cheap HF Antenna, The W3EDP on KG4GVL’s blog.

KG4GVL
Latest update on the W3EDP antenna. by: Brandon, the Random Man: More on the W3EDP http://t.co/niN6lzHAUO

 

Are more HF allocations in our future?

amradvictoria
IARU announces WRC-15 positionshttp://t.co/jFofmX02FF #hamradio

 

Filed Under: Antennas, Digital Communications, The Service Tagged With: FreeDV, iaru, W3EDP

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