Re: [kicad] Returning to contributing - high speed design tools

and of course, for the 'online DRC' - it doesnt always have to be MxN, since the operation only has to be on what is changing. Batch DRC, well that is an MxN problem, but can be spun into multi threads if it takes too long. Altium spun the batch DRC (the one you run just before you send it

Re: [kicad] Returning to contributing - high speed design tools

Hi James. Yeah I agree text based rule core is a fine way of representing it. What we will find is that as the rule base grows, the online DRC functions will start chewing considerable processor resources- it will likely need to be spun out into another low priority thread. Maybe the plain

Re: [kicad] Returning to contributing - high speed design tools

But... for a large design we'd end up with pages and pages of rules. Which is fine if they are generally hidden / encapsulated by the user. I'm all for the basis of the rule sytsem being all text DRC. But- I already have pages of rules with my basic experiments with Kicad. I have

Re: [kicad] Returning to contributing - high speed design tools

Have you guys looked how Altium does with with Xsignals ? anyone looked at my posts about this in the kicad forum.? it's a pretty good template. On Tue, 27 Feb 2024 at 09:34, Jon Evans wrote: > > The question is which groups of geometry items to show the total length > for in the dialog - do

Re: [Freetel-codec2] FreeDV is hiring a DSP engineer

Hi Mooneer wow that list of requirements and resposibilities  reads like a USD$250,000/year job.  or more. Perhaps it can be done by someone (a volunteer)  willing to manage a few volunteer contractors ? I'm happy to manage and coordinate as a volunteer. On 9/02/2024 10:19 am, Mooneer

Re: Re: [kicad] dev platform suggestions.

Appreciate the Wayland points. Years ago Wayland was the next cool thing but seems to not have gone far ? NVidia compatibility ? I am 100% AMD shop here- AMD Ryzen, Radeon graphics. I will never buy another Intel box after Intel dropped the Edision project 2 years after after promising

Re: [kicad] dev platform suggestions.

Thanks for the input. OK, Debian it is. I'm not a big fan of Ubuntu. too much GUI fluff. -- You received this message because you are subscribed to the Google Groups "KiCad Developers" group. To unsubscribe from this group and stop receiving emails from it, send an email to

[kicad] dev platform suggestions.

GIT user, but I will learn to be regards glen english -- You received this message because you are subscribed to the Google Groups "KiCad Developers" group. To unsubscribe from this group and stop receiving emails from it, send an email to devlist+unsubscr...@kicad.or

Re: [Freetel-codec2] Updating the libcodec2 binding in FFmpeg, fixed-point decoding

down,  it only sends the token tag to the decoder to look up and reproduce. IE a form of dynamic lookup table. There must be a name for doing this in computer science ??? glen On 29/12/2023 11:54 pm, Tomas Härdin wrote: fre 2023-12-29 klockan 10:44 +1100 skrev glen english LIST: Hi Tomas

Re: [Freetel-codec2] Updating the libcodec2 binding in FFmpeg, fixed-point decoding

Hi Tomas "codec2 + zip makes for even smaller files" implying that there is still redundancy to remove in the codec2 encoded voice files That sounds like low hanging fruit to pick. I guess though that is across a large number of frames (an audio book), where there may be redundancy /

Re: [Freetel-codec2] Codec 2 Algorithm description doc

d code etc. Is this your driving point ? regards glen english On 14/12/2023 8:41 pm, Sebastien F4GRX wrote: Hello, I agree reference code is important as a known-good base to help test the compliance of third party implementations, but code NEVER has been equivalent to a specificati

Re: [Freetel-codec2] Codec 2 Algorithm description doc

I support reference C code For a developer who needs to implement an algorthm on their platform, the reference C code (RCC) provides ability to numerically  test bench their platform code (essential) , and provides a well broken down algorithm method in the form of C code (essential) . In

Re: [Freetel-codec2] Linux-preferred desktop FreeDV?

Hi Adrian, cheers. Yeah thinking that the most popular installed environment would be the one with the dependences well sorted, searching for this on google, I couldnt find a consistent answer.LOL I've always run XFCE seems to have the smallest installed footprint but of course

[Freetel-codec2] Linux-preferred desktop FreeDV?

On Linux Debian, you get the option of XFCE, gnome, KDE, cinnamon, MATE, LXDE, and more I ask what is the most SUITED desktop environment for new installs to support the FreeDV GUI code ? glen VK1XX ___ Freetel-codec2 mailing list

Re: [Freetel-codec2] STM32 freeDV cost benchmarks

Hi Mooneer thanks for the comments. The FDIV on the ESP32-S3 is very slow I think 80 cycles, but of course one should always use RECIPS  and a MUL. Integer div is a couple of cycles IIRC. I'll start and see what jams it all up . regards, On 21/11/2023 4:01 pm, Mooneer Salem wrote: Hi

[Freetel-codec2] STM32 freeDV cost benchmarks

Hi Mooneer I am preparing to implement FreeDV on an FPGA. Is there a location in the repo somewhere, or does anyone have , anecdotally a feeling of, the major workloads / major consumers of processor time on the STM32 FreeDV port. regards ___

Re: [Freetel-codec2] Codec2 in real time on STM32

Hi Jan Just adding to the other two very good replies My experience with codec2 with STM32F4/F7 At O0, the performance may be down to 50% of -O2, and also, with O0, its likely the compiler is not exploiting any hardware speedups as with GCC there are some (invisible)  ties between -O level,

[time-nuts] Re: Realtime comparing PPS of 3 GPS

com ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe send an email to time-nuts-le...@lists.febo.com -- Glen English RF Communications and Electronics Engineer CORTEX RF Pacific Media Technologies Pty Ltd trading as Cortex RF ABN 40

[time-nuts] Re: GPSDO Control loop autotuning

For isolating noise, (for the purpose of off line analysis)  , using ICA (Independent Component Analysis) , a kind of blind source separation ,  can assist parting out the various noises to assist understanding the system better . There are some Python primers around for it. fantastic

[time-nuts] Re: Commercial solution - 122.88 Mhz low noise source

time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an email to time-nuts-le...@lists.febo.com To unsubscribe, go to and follow the instructions there. -- Glen English RF Communications and Electronics Engineer CORTEX RF Pacific Media Technologies Pty Ltd tr

[time-nuts] Re: Commercial solution - 122.88 Mhz low noise source

structions there. -- Glen English RF Communications and Electronics Engineer CORTEX RF Pacific Media Technologies Pty Ltd trading as Cortex RF ABN 40 075 532 008 PO Box 5231 Lyneham ACT 2602, Australia. au mobile : +61 (0)418 975077 ___ time-nuts mailing li

[time-nuts] Re: Tuning a GPSDO loop for optimal disturbance handling

If you are looking for a reasonably affordable   5 digit high count (8) DMM, I can recommend the VICHY VC8145 something like about USD160 new. has RS232 absolute accuracy is surprisingly good, close to my old Keithley. I used to cal with a mercury cell. good for looking at up to 8

[time-nuts] Re: Catching range of GPSDO

there. ___ time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an email to time-nuts-le...@lists.febo.com To unsubscribe, go to and follow the instructions there. -- Glen English RF Communications and Electronics Engineer CORTEX RF Pacific Media

[time-nuts] Re: Stability question

just watch out that added gain doesnt cause overload problems. There are quite alot of strong L band signals around, both in orbit and terrestrial. IE band pass filter before amplifier On 3/03/2022 6:15 pm, jack.davis wrote: My antenna is active and it uses 5 volts.  I tried 2 different

[time-nuts] Re: 4096 PLL - how to switch off on-chip VCO

Be aware of power supply noise rejection- or the lack of it. The 4046 phase comparator etc - they all have VERY LOW  almost zilch power supply noise rejection, IME. Same with CMOS gate oscillators etc. ADF4002 is a good chip. , Agreed Bob. I'm assuming this design is on a multilayer PCB ?

Re: [Freetel-codec2] Starting an organization for FreeDV/Codec2 development

elcome. Thanks, -Mooneer K6AQ ___ Freetel-codec2 mailing list Freetel-codec2@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/freetel-codec2 -- Glen English RF Communications and Electronics Engineer CORTEX RF Pacific Me

[time-nuts] Re: Current-day GPS timing receivers

For those of you interested in rolling your own a-la the Brooks Shera style, which is essentially adigital readout phase detector , these days , with almost a single chip with modern microcontrollers you can do better than the Shera hardware, I describe how I do it : The modern micros

[time-nuts] Re: Brooks Shera GPSDO

? Could I run this board as well with other (e.g. higher) frequencies and of independent oscillators? Are there improvements in meantime? regards, Arnold, DK2WT Am 20.02.2022 um 03:11 schrieb glen english LIST: Larry, Take a look at Brooks Shera's article in QST. you might know of it. In my

[time-nuts] Brooks Shera GPSDO

thru several HP 10811 and 10844 oscillators during that time. Even though Brooks is SK his GPSDO is still running. Regards. Bill, NL7F -- Glen English RF Communications and Electronics Engineer CORTEX RF Pacific Media Technologies Pty Ltd trading as Cortex RF ABN 40 075 532 008 PO Box 5231 Lyneha

[time-nuts] Re: 10 MHz TCXO periodically jumping 20 mHz up and down

Andy, do you have the PIC and the synthesiser chip data control lines well buffered/isolated (nice big resistors etc on the data lines ?) Any sort of current you inject into the synth chip will find its way onto the output On 19/02/2022 7:55 pm, Andy Talbot wrote: A while back I

[time-nuts] Re: 10 MHz TCXO periodically jumping 20 mHz up and down

I have used the switched capacitor type, with direct control over the switching caps . We were able to high speed dither the switch settings to get 1/2 and 1/4 and 1/8 steps of the minimum capacitor switch step. This way, we got high control resolution. BUT- this only works for requirements

[time-nuts] Re: Tonga effect on GPS

feet, by 1 mm (or whatever)" ___ time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an email to time-nuts-le...@lists.febo.com To unsubscribe, go to and follow the instructions there. -- Glen English RF Comm

[time-nuts] Re: PLL subharmonic spurs

ocked loop. A double balanced mixer with pure sine wave sources is probably the gold standard Horses for courses On 7/02/2022 9:03 pm, m...@vresearch.pt wrote: Just being rude Glen. I'm searching for a source document that someone could share. Just that. -Original Message----- From: glen en

[time-nuts] Re: PLL subharmonic spurs

to estimate are multiple of the reference frequency (i.e. at the input of phase detector). -- Glen English RF Communications and Electronics Engineer CORTEX RF Pacific Media Technologies Pty Ltd trading as Cortex RF ABN 40 075 532 008 PO Box 5231 Lyneham ACT 2602, Australia. au mobile : +61 (0)418

[time-nuts] Re: electronics question or how not to fry my raspberry pi

I endorse Dave's suggestion (below) . The resistive divider is simple but slows down the edge rate which may be undesirable especially if the input isnt a schmitt. The MOSFET solution is the most appropriate. take a look what is inside packaged translators... just that. On 29/01/2022 10:33

[time-nuts] Re: electronics question or how not to fry my raspberry pi

and unless you have LOTS of experience, avoid automatic direction (bidirectional)  translators - they are very sensitivie to pullups, downs etc. I think best avoided unless there is no option. I2C is where they are useful. But otherwise, stick to unidirectional level translating as Andrew

[time-nuts] Re: Another reason to monitor line frequency :) - My AC measurement project & question

hear hear.stick to galvanic isolation or better  - On MF/SW broadcast sites for this we used optically coupled sensors. The mains supply is simply intensity modulating an opto isolator ( a pair actually for both sides of the waveform) .. They can with stand a fair degree of overload and its

Re: [Freetel-codec2] 1600 mode and constellation points

and walking pilots are used . DRM is in general transmitted up to 20kHz bandwidth and more pilots are required. In DVBT- same power is used but the pilot data is repeated and the demod averages over multiple periods. -glen english On 25/08/2021 12:03 am, Brian Morrison wrote: On Mon, 2021

Re: [Freetel-codec2] Questions about Codec2 embedded performance

I think, based on my profressional experience with the F4 , L4, L, in battery environments - you would be far better to use an F4 part for this. -aggressively down clock it when the full clock speed is unnecessary You can save a ton of power doing that. The chip is very good at changing

Re: [Freetel-codec2] Questions about Codec2 embedded performance

to encode real time ? Glen English STM32L0, L1, L2, F0 , F4, F7 and Xilinx FPGA person. On 5/14/2021 8:51 AM, Josh Lloyd via Freetel-codec2 wrote: Hi Bruce, thanks for your reply. > Hardware floating point is requ ___ Freetel-codec2 mailing l

Re: [Freetel-codec2] Questions about Codec2 embedded performance

to encode real time ? Glen English STM32L0, L1, L2, F0 , F4, F7 and Xilinx FPGA person. On 5/14/2021 8:51 AM, Josh Lloyd via Freetel-codec2 wrote: Hi Bruce, thanks for your reply. > Hardware floating point is requ ___ Freetel-codec2 mailing l

Re: [Freetel-codec2] FreeDV data mode NOT ACCEPTABLE SPECTRAL PURITY

=6317 - David On 10/8/20 6:50 am, glen english wrote: except that the Pi transmitter has unacceptable spectral purity. On 9/08/2020 7:18 pm, Adrian Musceac wrote: Thanks David for the news. One question: how high can the Pi transmitter go in frequency? Our 70 cm band is pretty crowded

Re: [Freetel-codec2] FreeDV data mode

believe it meets the spectral purity requirements of the Amateur LCD on 2M: http://www.rowetel.com/?p=7207 and on HF: http://www.rowetel.com/?p=6317 - David On 10/8/20 6:50 am, glen english wrote: except that the Pi transmitter has unacceptable spectral purity. On 9/08/2020 7:18 pm, Adrian

Re: [Freetel-codec2] FreeDV data mode

except that the Pi transmitter has unacceptable spectral purity. On 9/08/2020 7:18 pm, Adrian Musceac wrote: Thanks David for the news. One question: how high can the Pi transmitter go in frequency? Our 70 cm band is pretty crowded, but the 23 cm band and 2305-2400 MHz bands are underutilized

Re: [time-nuts] sub harmonic VCO locking

for the 1-4 GHz VCO input (LTC6945 etc) When I need to get the 5kHz to 100kHz noise down, I'l probably go for direct multiplication. 73 On 8/1/2020 2:06 PM, Attila Kinali wrote: On Thu, 30 Jul 2020 21:56:42 +1000 glen english LIST wrote: - a double-double-double could work, but my

[time-nuts] sub harmonic VCO locking

Before I commit the soldering iron, can anyone share their sub-harmonic injection locking experiences ? I have to make 393.216 from 49.152 . Yes, lots of ways I know. injection locked at 1/8 of the frequency from the decent source. There wont be any issue of locking to the wrong harmonic,

Re: [Freetel-codec2] SM3000 comment time

2020-07-23 klockan 08:54 +1000 skrev Glen English ___ Freetel-codec2 mailing list Freetel-codec2@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/freetel-codec2

Re: [Freetel-codec2] Are we being distracted by LPCnet

IMO You wont attract too many FM people to 700D, LPCnet-C2  can win over those , at least in terms of voice quality and robustness (compared to DSTAR, and DMR is really more like CB) , given that LPCnet with a relatively simple modem can be 12dB ahead of FM. Needs a frequency hopping radio

Re: [Freetel-codec2] Are we being distracted by LPCnet

Hi Adrian Good  rational points you make. BTW:AD9361, AD9371, ADRV9008 are all "sub-optimal" (I have to be nice to my ADI friends) for narrow band work. too noisy, insufficient dynamic range. But this new one is worth looking at (I have info on it on NDA) here is the (public) pre release

Re: [Freetel-codec2] Are we being distracted by LPCnet

@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/freetel-codec2 -- Glen English RF Communications and Electronics Engineer CORTEX RF & Pacific Media Technologies Pty Ltd ABN 40 075 532 008 PO Box 5231 Lyneham ACT 2602, Australia. au mobile : +61 (0)418 97

Re: [Freetel-codec2] SM3000 comment time

that :-) ___ Freetel-codec2 mailing list Freetel-codec2@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/freetel-codec2 -- Glen English RF Communications and Electronics Engineer CORTEX RF & Pacific Media Technologies Pty Ltd

Re: [Freetel-codec2] SM3000 comment time

Hi Steve I did a google and found this : https://kicad-pcb.org/external-tools/altium2kicad/ On 22/07/2020 23:00, Steve wrote: On Wed, Jul 22, 2020 at 7:28 AM Tomas Härdin wrote: So anyone wanting to develop or modify the SM3000 would need to install two pieces of proprietary software with

Re: [Freetel-codec2] SM3000 comment time

VIVADO. :-) glen On 22/07/2020 22:26, Tomas Härdin wrote: sön 2020-07-19 klockan 09:25 +1000 skrev glen english: I am designing an SM3000, and now is the time for input from users. (input request below) [...] I have chosen the Xilinx Zynq XC7007S hybrid CortexA9 / FPGA . The single core

[Freetel-codec2] new group : sm3000-freedv-...@groups.io

Hi All Thanks for people's time to write  very useful input . Because this forum freetel-codec2 is getting a little polluted by SM3000 stuff, I have created a new group specifically to handle SM3000 discussions and dev. sm3000-freedv-...@groups.io you can join here :

Re: [Freetel-codec2] SM3000 pricing SM1000 features

and careful with your personal options about others on this list. - David ___ Freetel-codec2 mailing list Freetel-codec2@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/freetel-codec2 -- Glen English RF Communications

[Freetel-codec2] Mode 2020 and non PC platforms- Alan's question

, The question is for me, how close are we to getting Mode 2020 running on a top-end Pi, Odroid XX etc.? As it stands now, Mode 700D runs well on almost any Pi. And putting one in a small box with USB peripherals is not a problem really. Alan VK2ZIW On Tue, 21 Jul 2020 08:27:08 +1000, Glen English wrote

Re: [Freetel-codec2] forum

reflector. https://groups.io Just some thoughts... Steve ___ Freetel-codec2 mailing list Freetel-codec2@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/freetel-codec2 -- Glen English RF Communications and Electronics Engineer CORTEX RF

Re: [Freetel-codec2] SM3000 pricing SM1000 features

in a small box with USB peripherals is not a problem really. Alan VK2ZIW On Tue, 21 Jul 2020 08:27:08 +1000, Glen English wrote I need some comments to drive decisions on part choices for the SM3 My focus is on accessability- being affordable. Having said that a few dollars saved is poor

[Freetel-codec2] SM3000 pricing SM1000 features

I need some comments to drive decisions on part choices for the SM3 My focus is on accessability- being affordable. Having said that a few dollars saved is poor savings if the new box cannot meet our forseeable objectives. The original project leaders are not providing any opinions,

[Freetel-codec2] OFDM and interference tips

I read in one of the comments  in the FreeDV blog- someone was wondering why FreeDV did better than expected amongst local noise. The main reason is that many noises are single carriers. As long as the level of the interferer does not cause too much AGC action (which would reduce the SNR of

Re: [Freetel-codec2] SM3000 comment time

, 2020, 2:36 PM glen english <mailto:g...@cortexrf.com.au>> wrote: Altium 20. On 20/07/2020 7:33 am, Steve wrote: > Is this going to be a KiCAD project? > > > ___ > Freetel-codec2 mailing l

Re: [Freetel-codec2] SM3000 comment time

Altium 20. On 20/07/2020 7:33 am, Steve wrote: Is this going to be a KiCAD project? ___ Freetel-codec2 mailing list Freetel-codec2@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/freetel-codec2 -- Glen English RF Communications

Re: [Freetel-codec2] SM3000 comment time

regon, USA ___ Freetel-codec2 mailing list Freetel-codec2@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/freetel-codec2 -- Glen English RF Communications and Electronics Engineer CORTEX RF & Pacific Media Technologies Pty Ltd ABN 40 075 532 008 PO Bo

Re: [Freetel-codec2] SM3000 comment time

symbol tables, -- Glen English RF Communications and Electronics Engineer CORTEX RF & Pacific Media Technologies Pty Ltd ABN 40 075 532 008 PO Box 5231 Lyneham ACT 2602, Australia. au mobile : +61 (0)418 975077 ___ Freetel-codec2 mailing

Re: [Freetel-codec2] SM3000 comment time

:35 pm, Mike O'Connor wrote: On 19/7/20 4:48 pm, glen english wrote: What I want to achieve is a instant on, plug and play solution with digital radio /front panel upgrade path. In the spirit of the SM1000.  Turn on and it is ready 1 second later .  Just load the image and no more to do. This is t

Re: [Freetel-codec2] SM3000 comment time

What I want to achieve is a instant on, plug and play solution with digital radio /front panel upgrade path. In the spirit of the SM1000.  Turn on and it is ready 1 second later .  Just load the image and no more to do. This is the way to drive uptake and broad usage. and no issues like Pi

Re: [Freetel-codec2] SM3000 comment time

potentially reduce requirements, too. (BTW, I imagine actually building on the target would be rare. Cross compiling on a desktop or laptop PC will always be significantly faster, even taking transfer time into account.) -Mooneer K6AQ On Sat, Jul 18, 2020 at 4:27 PM glen english <mailt

[Freetel-codec2] SM3000 comment time

I am designing an SM3000, and now is the time for input from users. (input request below) * Design Goals : High computational capability : So that our modems and codecs as they become more advanced, are less constrained by the STM32F4 platform. Platform to be Linux so that development,

Re: [Freetel-codec2] OFDM modem sync bug

, or substitute code. thanks! On Thu, Jul 16, 2020 at 6:25 AM glen english mailto:g...@cortexrf.com.au>> wrote: Hi Steve yep It didnt take long to find, a few minutes , since, well it seems modems all have the same type of bugs... if you design modems long enough

Re: [Freetel-codec2] OFDM modem sync bug

, or it is garbled by the ether. The value is not really important, just that it be the same BPSK value, which the decodes to two indexes of the bits rx_uw of value 0:0 On Thu, Jul 16, 2020 at 3:25 AM Glen English <mailto:g...@cortexrf.com.au>> wrote: anyone going to fix the FreeDV O

Re: [Freetel-codec2] OFDM modem sync bug

anyone going to fix the FreeDV OFDM modem ? I'll located the bug, the line number etc.. On 16/07/2020 08:31, glen english wrote: Excellent Alan ! right, like I thought , tx_uw always zeros , and rx_uw goes to zero because input level falls. OK David, I am sure you had other ideas

Re: [Freetel-codec2] On Parrot repeaters

r repeater scene here, there's no communication on needs. there is still a Yahoo group but none it seems of the current repeater maintainers ever post or read it. Test equipment: I now have an Advantest U3641N the 75 ohm version. Alan VK2ZIW On Thu, 16 Jul 2020 11:00:58 +1000, glen english wro

[Freetel-codec2] On Parrot repeaters

posted here for the benefit of all the non-RF people : Hi Alan. OK roger all that. as you know, duplexors, cavity filters, bla bla are my home game... if you have interaction problems between them the cable lengths are wrong between the filters. IE the coupling is wrong. with a single

Re: [Freetel-codec2] Alans OFDM sync problem

0 rx_uw ; 100101 SYN: 2 5 1 6 ; tx_uw 00 rx_uw ; 0010111010 state: Rx Maybe UnSync       peak:    254  sync: 0 SNR: -8.8  triggered: 1 recordany: 0 rxDataCnt 1988 ncodec 0 * *Alan VK2ZIW* * * *On Wed, 15 Jul 2020 22:45:24 +1000, glen english wrote* > well, looks OK, looks like

Re: [Freetel-codec2] Alans OFDM sync problem

rxDataCnt 1428 ncodec 0* No more SYN: n n n n messages. *Over to you...* * * *Alan VK2ZIW* * * * * *On Wed, 15 Jul 2020 19:43:37 +1000, glen english wrote* > Alan, please be sure to keep correct subject line. > Right. ofdm.c > voidofdm_sync_state_machine(structOFDM *ofdm, uint8_t*rx_uw) >

[Freetel-codec2] Alans OFDM sync problem

Alan, please be sure to keep correct subject line. Right. ofdm.c voidofdm_sync_state_machine(structOFDM *ofdm, uint8_t*rx_uw)  there are two synced states, synced (ongoing) and trial sync (when sync is getting established for the first time- checking if this is real sync or bogus sync due to

Re: [Freetel-codec2] more on OFDM AGC

ble > to measure BER, but you'll be able to see if the LDPC decoder is > converging, and if the demod is falling over in the fast ALC condition. > > - David > > On 14/7/20 5:09 pm, glen english wrote: > > OK, in addition to my actual recordings, > > > > that would be using :

[Freetel-codec2] FreeDV linux VM TX audio buffer emptys gaps

Debian Buster GUEST , in VM (VMWARE) on windows 64 bit host I get TX audio to radio outbuffer empty counter running mad and obviously audio gaps in TX happens with PCIe sound or USB sound. changing base priorities niceness  etc no improvement. (unless freeDV is overriding something I need

Re: [Freetel-codec2] more on OFDM AGC

ding profile running with the command line version of the modem. Cheers, David ___ Freetel-codec2 mailing list Freetel-codec2@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/freetel-codec2 -- Glen English RF Communications and

[Freetel-codec2] more on OFDM AGC

hi David further to my previous email (pre requisite) : perhaps  something is mismatched for the application here. : I have not been looking for long , but there are not many places where there is amplitude calcs and a time constant. -- ofdm.c /* update mean amplitude

[Freetel-codec2] FreeDV OFDM modem AGC response q.

Hi David AGC questions. We had the WIA broadcast running all weekend on 50.25 in 700D and 2020 in 'berra. I was mobile around canberra for some of the weekend with FreeDV, with my laptop and the FT857 Something interesting and unexpected experiences.. When I had the AGC set to SLOW, the

[Freetel-codec2] On clock offsets and sample rates FreeDV

Great resource, thanks David On our tests,  many users were reporting 100ppm error and BER ~ 5%. Even with athat sample rate error , this is well within the capture of the OFDM modem (nice one David !) , even with that steady state error, users were reporting that non zero BER on otherwise

[Freetel-codec2] FreeDV OFDM modem sample clock offset maximum

For the OFDM modem in 1.4.1 700D, What is the sample clock offset corrector's maximum offset for pull-in,  and hold in ? investigating some trouble here. I'm guess the pull clock for the TX samples are generated by the sound device, and errors there will be the sound device and any error in

Re: [Freetel-codec2] location of test scripts for codec2

I used to run, which is here: https://gist.github.com/darksidelemm/f09c3eb4a0fe837e4fd42347d264d85a Note that this is fairly VK5 specific, and includes some custom preambles and outros. 73 Mark VK5QI On Sat, Jul 11, 2020 at 6:23 PM glen english <mailto:g...@cortexrf.com.au>&

[Freetel-codec2] location of test scripts for codec2

In prep for adding and modifying things in FreeDV, this evening I built FreeDV from source on debian BUSTER. Wow everything worked. well done everyone :-) ! Now, I remember seeing the scripts for running audio and codec2 tests But I cannot remember or find their location. Anyone care to

[Freetel-codec2] VK1 canberra FreeDV action

In VK1 Have been running voice keyer all day on different modes..., 20W RMS 6m 50.25 (beaming  030 Hpol) quite a few locals decoding it with interest. like : " Ok, for the benefit of the group, I had some success too. I can decode 700D but my computer doesn't do 2020 (computer too old).

[Freetel-codec2] ALC no ! - 700D IC7300 TX setting !

Hi All I think the general advice to set the transmit power to when the ALC begins to activate is incorrect. Different  radios have very different time constants for their metering. In the IC7300, by the time the ALC begins to show on the display, you are making a real mess of it. Suggest

Re: [Freetel-codec2] to FEC or not

with LDPC.  Agreed that we need to pick the code length and rate carefully to avoid too much latency, but still give good performance. Cheers, Bill On 9/7/20 11:57 am, Glen English wrote: Hi David and group I want to discuss "to FEC or not to FEC" years ago, david and I had a conve

[Freetel-codec2] to FEC or not

ts/listinfo/freetel-codec2 ___ Freetel-codec2 mailing list Freetel-codec2@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/freetel-codec2 -- Glen English RF Communications and Electronics Engineer CORTEX RF & Pacific Media Technologi

Re: [Freetel-codec2] 4FSK/FreeDV/MSK/OFDM

ht? If you get that far I'll help you design the ctests we'll need to see as well. Cheers, David On 6/7/20 7:10 pm, glen english wrote: Hi David The goal is to improve FreeDV so that it is at least equal with SSB on a flat VHF channel. On HF, the performance of FreeDV is better than SSB mainly

Re: [Freetel-codec2] What do you think about this...C4FM

Someone needs t0 point out to these people such bandwidth is only permitted at 29 MHz FM and not anywhere else. I will look up the rules (to make sure I am not out of date and I am correct...) and read them the riot act when I get home glen On 6/07/2020 6:18 pm, Al Beard wrote: Hi all, I

Re: [Freetel-codec2] 4FSK/FreeDV/MSK/OFDM

below and I'm unclear on what you are trying to achieve. Can you pls tell me what the goal of your proposed work is? Cheers, David On 5/7/20 6:43 pm, glen english wrote: I've been looking at an coherent MSK modem for Codec2. I have not done any coherent MSK modems since the late 90s. Using an  SSB

Re: [Freetel-codec2] 4FSK/FreeDV/MSK/OFDM

I've been looking at an coherent MSK modem for Codec2. I have not done any coherent MSK modems since the late 90s. Using an  SSB radio , at something like 1600 bps , there will still be appreciable PAPR on MSK due to bandwidth constraint. probably about 3dB PAPR on a 2400Hz wide radio.  When

Re: [Freetel-codec2] FreeDV GUI mode 2020 on Odroid N2

yeah i recommended to Alan he assign core affinity, For a single threaded program , it can win you a few % by assigning afinnity on the command line.. However-  How multithreaded is it Alan ? if it is well multi threaded, and IF there are significant worker threads, you will find substantial

Re: [Freetel-codec2] FreeDV GUI mode 2020 on Odroid N2

you run up my "parrot" and test your modem? Or, patch freebeacon to use freedv_rawdatarx() and then from 'data' decode to audio. Alan VK2ZIW On Sat, 4 Jul 2020 18:02:58 +1000, glen english wrote nice one Alan I am working on a  VHF modem. probably MSK with fully coherent MSK d

Re: [Freetel-codec2] FreeDV GUI mode 2020 on Odroid N2

nice one Alan I am working on a  VHF modem. probably MSK with fully coherent MSK demodulator (for SSB TX or otherwise IQ) On 4/07/2020 5:51 pm, Al Beard wrote: Hi guys, Battling "parrot" on my Odroid N2 caused me to check my audio with the FreeDV GUI. Testing PC speaker to the mic on the

Re: [time-nuts] 30 MHz freq adjust by Hz

good enough. Indeed, the noise of the 5Hz and the mixer setup does get into the act. That may rule out a simple R/C oscillator as the source of the 5 Hz “tone”….. Bob On Jun 30, 2020, at 9:36 PM, glen english LIST wrote: Hello group I have an idea that might work, and I wanted to discuss

[time-nuts] 30 MHz freq adjust by Hz

Hello group I have an idea that might work, and I wanted to discuss  with likeminded that might already have experience with the problem. Shifting a fixed oscillator a few Hz using a image reject mixer. background : From time to time I (and others) make lock boards for ham gear, pulling the

[Freetel-codec2] FreeDV on 6m

Yesterday, Dave Moore Vk2DVM   and I got FreeDV loaded and running on 6m , between sydney and canberra (260km path) We used a variety of modes, but 700D and 2020 are really the only modes you might as well use, other modes are either legacy, or designed for specific jobs (es-hail satellite

Re: [Freetel-codec2] clip

alright. The squash limiter works by subtracting  a threshold from the ABS level sample by sample This resultant is negative clipped at 0, so that only peak events > threshold produce any positive and non zero numbers This value is fed (sample by sample again) into a short FIR low pass

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