Re: [Freetel-codec2] Codec2 and OpenGD77

way it would be 100% open source which would be super awesome. I would imagine leaving the DMR standard (9.6kbps) in favour of a lower phy bit rate would also offer gains as far as power per bit is concerned, but that would be much more involved I would guess. Regards, Daniel Mundall VA7DRM

Re: [Freetel-codec2] Codec2 and OpenGD77

ause there could be hardware limitations with what is even available as far a hardware functions on the MCU. Regards, Daniel Mundall VA7DRM On Tue, Feb 2, 2021 at 5:59 AM Eric Jacksch wrote: > I don't know enough about CODECS to know the right answer (thus must > post here), but right now th

Re: [Freetel-codec2] TDMA and digital voice

Hi Adrian, Totally agree about the SDR hardware getting cheaper, a good case in point is the limeSDR mini which has more than enough flexibility for any ham style project. https://www.crowdsupply.com/lime-micro/limesdr-mini#products-top Couple that with a rock64 and you could have a great low

Re: [Freetel-codec2] TDMA and digital voice

of the large aims of the SM2000. For my part I have a few limeSDR's that I've been playing with using Pothos and GNU Radio to try and learn how everything works well enough that I can actually contribute to something like this. Have a great day! Daniel Mundall On Sun, Nov 5, 2017 at 10:39 PM, Ross

Re: [Freetel-codec2] Freedv.org server movement

I'll host freedv.org for free as a contribution to the project if that interests you. I can install a blank Wordpress too. Just let me know. Daniel Mundall Sent from Daniel's iPhone > On Jul 27, 2017, at 10:08 AM, Bruce Perens <br...@perens.com> wrote: > > The server company

Re: [Freetel-codec2] LoRa Modulation

Hi Steve, I think that this is a great idea, we've been playing with LoRa for a few years now with great results. And now with some SDR libraries showing up it stands to be an interesting option for UHF Voice/messaging. 73's Daniel Daniel Mundall On Mon, Feb 27, 2017 at 2:00 PM, Steve

Re: [Freetel-codec2] Simple SDR for VHF FreeDV

Hi Glen, We haven't dropped the CMX994, David has just been feeling out other options. I just got my dev boards for the CMX994 and 971 today so I'll be running some test with them over the next few days. Daniel Daniel Mundall On Wed, Feb 25, 2015 at 2:20 PM, glen english g...@cortexrf.com.au

Re: [Freetel-codec2] soft-rock design

David, The Si570 is around $10 dollars at best, seems like there's no cost savings to be found down this route. Just my thoughts anyway. Daniel Daniel Mundall On Wed, Feb 25, 2015 at 6:46 PM, David Rowe da...@rowetel.com wrote: Hi Glen, Thanks you for those suggestion, the VHF soft rock

Re: [Freetel-codec2] perils of single frequency repeaters

see a BER for each method to see what it's doing. Daniel Mundall VA7DRM On Tue, Feb 17, 2015 at 2:29 PM, glen english g...@cortexrf.com.au wrote: Hi Daniel I'll be looking forward to your single antenna split result- just a T piece on a BNC will do the job (costs 6dB rather than 3dB) I

Re: [Freetel-codec2] RX chip CMX994

branches (channels) the benefits are diminishing... With a digital system the two branch diversity will be the difference between a system with less coverage than the analog, and a system that is far superior. 73 glen On 17/02/2015 2:36 PM, Daniel Mundall wrote: Hello Glen, Thanks

Re: [Freetel-codec2] RX chip CMX994

, do you know anything about turnstile antennas configured as horizontal polarized omni antennas, are they any good? I've been thinking of building one for testing H-pol. ( http://www.g8seq.com/vhf_antennas.php ) Thanks, Daniel VA7DRM Daniel Mundall On Mon, Feb 16, 2015 at 1:59 AM, glen english

Re: [Freetel-codec2] Fwd: VHF Adjacent Signal Filtering

with an STM32, presuming that they'd help. Thanks again for your input on all this, you have no idea how much time you are saving me! Daniel VA7DRM Daniel Mundall On Sun, Feb 8, 2015 at 7:17 PM, glen english g...@cortexrf.com.au wrote: Hi Daniel SAW filter post VNA is good idea. Although

[Freetel-codec2] Codec2 100ms frame size

Hello David, Maybe this question has been asked before, but if I went to a 100ms audio frame size what quality advantages could I get? I'm wondering if I could get a 2400bits/s quality in say 1700bits/s. Thanks, Daniel Mundall VA7DRM

[Freetel-codec2] FDMDV Time Domain Duplexing

to keep the timing correct while having 20ms interruptions every 20ms? Thanks, Daniel Mundall VA7DRM -- Learn Graph Databases - Download FREE O'Reilly Book Graph Databases is the definitive new guide to graph databases

Re: [Freetel-codec2] FDMDV Time Domain Duplexing

changes by measuring the BER at an Eb/No point, as per the Octave simulations. It's really easy to introduce an error that will degrade the demod performance. Cheers, David On Sun, 2014-04-20 at 14:58 -0700, Daniel Mundall wrote: Hello Guys, I've been playing with the FDMDV modem to see if I can

Re: [Freetel-codec2] FreeDV Robustness

Rick, Thanks for the info! Somewhere along the line I must have gotten some wrong numbers, if RS is really that good, it totally makes sense to use it, at least on the more important bits. Thanks for correcting me! 73s Daniel Mundall On Wed, Mar 6, 2013 at 10:03 AM, Rick Muething rmueth

Re: [Freetel-codec2] FreeDV Robustness 2

want to see how much potential there is. 73s, Daniel Mundall On Wed, Mar 6, 2013 at 2:15 PM, David Rowe da...@rowetel.com wrote: Hi Daniel, Re FEC currently I am currently trying a Golay (23,11) code which is about half rate, and can correct 3 errors out of 12 data bits. Lots of other

Re: [Freetel-codec2] Changing the Sample Rate

get them to 96 K at the cost that some sound cards won't work. Pretty much all of them do 48 K. The rest of it is C source code - it won't be trivial to change it but not impossible either. Daniel Mundall va7...@gmail.com wrote: Hi, I was wondering how much difficult it would be to change

[Freetel-codec2] Changing the Sample Rate

Hi, I was wondering how much difficult it would be to change the sample rate to something more than the symbol rate? More than 160 samples per symbol. I'd like to experiment with some more wideband arrangements of OFDM. Thanks for any thoughts, Daniel Mundall

Re: [Freetel-codec2] VHF modem for codec2

We've designed a digital 10w 2m radio that we're just testing at the moment. Any input would be great. Have a look at hamcell.com 73's Daniel VA7DRM Sent from my iPad On 2012-05-20, at 1:00 PM, Kristoff Bonne krist...@skypro.be wrote: Hi Matthew, Well, I try not to look to much at that

Re: [Freetel-codec2] Slogan?

Codec2 Digital gives you more! On Apr 27, 2012, at 1:33 PM, Matt Ettus m...@ettus.com wrote: Speak Freely On Fri, Apr 27, 2012 at 10:39 AM, Bruce Perens br...@perens.com wrote: I was thinking of Digital that's better than analog.

Re: [Freetel-codec2] KISS mode, anyone?

to have a lot of options! If you have any ideas you'd like to add to the project, we'd love to hear about them. You probably know a lot more about this stuff then I do... Hope your current project goes well. Best Regards, Daniel Mundall VA7DRM KE7VLV On Thu, Feb 16, 2012 at 11:57 AM, Bruce Perens