You will have corrected the URL yourselves: https://github.com/f4grx/hn70ap
Sebastien Le 09/03/2018 à 09:59, Sebastien F4GRX a écrit : > > Friends, > > > I am doing this RIGHT NOW: > > https://github.cm/f4grx/hn70ap > > The board prototype WORKS with a RTOS, NuttX. The Ethernet link works, the > radio chip initializes OK via SPI. > > All we need is to continue this project. This will give us > > - an embedded base station for a digital voice network. > > - a 1 Mbps hamnet node > > - anything else that can use ethernet and UHF: Domotics, cubesats, etc. > > > The board has a secondary si4463 with separate TX and RX line, for use with a > decent PA and LNA outside of ISM. > > > Raspberry pi hostspot guys will be able to join the fun later. > > Next step is reverse engineering some silabs python code to get a fully > configurable si4463 driver instead of relying on canned configurations > generated by a proprietary tool. We can do this because silabs refuses to give > code, for the sake of interoperability. > > > Next project will be to extend something like this to add a stm32 and a UHF > radio module: > > https://dooba.io/en/articles/59 > > > We will then have working freedv hardware, FULLY OPEN SOURCE from first bit to > last atom. > > Then the networking guys will have no more excuse. > > > WE ARE EXPERIMENTERS. > > Needing operators is a BAD excuse. This leads too many people to LEAVE > experimentation and focus on operating bad commercial hardware. > > We can be the operators of our own experiments. > > > Forget experimentation, and ham radio is globally doomed. The death movement > already started, btw. > > Let's revive it, every day. > > > Sebastien > > > Le 09/03/2018 à 09:05, Danilo Beuche a écrit : >> >> Hi Leon, >> >> if you design with a STM32F4xx and 100 pin, I would recommend to choose one >> of the newer types (read STM32F469/STM32F479). They have a pinout compatible >> to the 100 pin STM32F7xx line (and it is only slightly different compared to >> the STM32F40x so a relayout shouldn't be hard). With this it would be trivial >> to drop in a much higher performance STM32F7xx without PCB redesign. The F7xx >> gives about twice as much performance as the F4xx with about the same amount >> of power used (that is our experience with the signal processing in the >> UHSDR/mcHF vs. UHSDR/OVI40 firmware builds). This restriction does apply for >> 100pin devices only. So if you used a 144 pin variant of the STM32F405, >> nothing to worry about. >> >> BTW, once the STM32H7 is really readily available, you get either even more >> processing power at 400 Mhz clock for about the same power usage or at the >> same clock rate similar performance but less power consumption due to >> shrinked MCU design (90 -> 40nm AFAIR). >> >> Danilo >> >> >> >> On 09.03.2018 07:00, Leon Lessing wrote: >>> Hi all, >>> >>> Just bear with me here, >>> My experience with some of the brandmeister guys has been less than >>> spectacular. There is no reason we cannot use "dmr framing" and use codec2 >>> to transmit stuff, effectively splitting a dmr channel into 4 potential >>> codec2 slots. >>> >>> I have revamped the adf7021 hotspot thing so it is more rf friendly, the >>> design is unfortunately in eagle 7.7, mail me for a copy. >>> >>> This week I have been on holiday and struggling with the lora issue, but in >>> the back of my mind I have been thinking mmdvm, hotspot hardware adf7021, >>> sm1000 and 1296. I am about 90% finished with a mmdvm/sm1000/sdcard hybrid >>> using a stm32f405. >>> >>> The code from mmdvm_hs uses bit banging to talk to the adf7021, I will add >>> an adf7021 to the mix and maybe a rda1846, a gps and esp8266. Another idea >>> is to break out the extra control lines and spi bus from the stm32f405 to a >>> connector so we can build a stacked system. I'll publish the pcbs, I have no >>> idea how we can use git or svn to share the pcb work. >>> >>> There is issues with the adf7021 and harmonics, this is why the commercial >>> market uses R5000 (dedicated dmr framing) and the CML data pump devices. >>> Dual band matching seems to be an issue with this device as well, I am >>> trying to get the hotspot hardware to work on 145Mhz without harmonics on >>> 290Mhz. >>> >>> Please mail me if you need a copy of the files for a peer design review, I >>> will use dirtypcbs to do the dev run and give you guys the links and you can >>> order pcbs, shipping from South Africa is terribly expensive. >>> >>> Look at the pine64 as an alternative to raspberries. The idea of doing a sdr >>> radio is excellent, but mixer bleed through is a massive issue for the >>> transmitting side. (most mixers gives 60db local suppression, but 60db down >>> on +5dbm local inject is still a very strong signal) >>> >>> Regards, >>> Leon >>> >>> >>> >>> >>> Leon Lessing >>> 雷立安 >>> ZS6LMG/AC9GU >>> >>> >>> >>> On Fri, Mar 9, 2018 at 1:31 AM, Adrian Musceac <kanto...@gmail.com >>> <mailto:kanto...@gmail.com>> wrote: >>> >>> Hi Alan, >>> >>> > >>> > I ask, how far are we in being able to completely replace the firmware >>> > in the lowly MD-380 and clone radios? Or, could we beef up the power >>> in >>> > the 7021, already used in the project!!!!!! >>> > >>> That (as in running Codec2 2400A) will never happen for technical >>> reasons. >>> >>> Using an SDR it's possible to have Codec2, C4FM, D-Star, DMR and >>> whatever else on a single device. >>> >>> There exist handheld full SDR terminals with a price point of >>> $800-$1000, capable of running almost everything you want up to high >>> speed video. Documentation is close to zero, writing software for them >>> would cost in the high 6 digits figures (not going to happen soon). >>> Said terminals will go EOL in 4-5 years as public services transition >>> to LTE. >>> >>> If you want to try some of the new digital modes without spending a >>> fortune in equipment and DSP training, I suggest to invest some time >>> in learning GNU radio. It's the only viable alternative. I managed to >>> make for myself 4 types of Codec2 VHF modems using it. BPSK, QPSK, >>> 2FSK and 4FSK. Enough to play with for a while. OP25 (a GNU radio >>> project) has had P25, C4FM, D-Star and DMR for a while now. Combining >>> them into a single, easy to use application is just a matter of time. >>> >>> Cheers, >>> Adrian >>> >>> >>> ------------------------------------------------------------------------------ >>> Check out the vibrant tech community on one of the world's most >>> engaging tech sites, Slashdot.org! http://sdm.link/slashdot >>> _______________________________________________ >>> Freetel-codec2 mailing list >>> Freetel-codec2@lists.sourceforge.net >>> <mailto:Freetel-codec2@lists.sourceforge.net> >>> https://lists.sourceforge.net/lists/listinfo/freetel-codec2 >>> <https://lists.sourceforge.net/lists/listinfo/freetel-codec2> >>> >>> >>> >>> >>> ------------------------------------------------------------------------------ >>> Check out the vibrant tech community on one of the world's most >>> engaging tech sites, Slashdot.org! http://sdm.link/slashdot >>> >>> >>> _______________________________________________ >>> Freetel-codec2 mailing list >>> Freetel-codec2@lists.sourceforge.net >>> https://lists.sourceforge.net/lists/listinfo/freetel-codec2 >> >> >> >> ------------------------------------------------------------------------------ >> Check out the vibrant tech community on one of the world's most >> engaging tech sites, Slashdot.org! http://sdm.link/slashdot >> >> >> _______________________________________________ >> Freetel-codec2 mailing list >> Freetel-codec2@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/freetel-codec2 > > > > ------------------------------------------------------------------------------ > Check out the vibrant tech community on one of the world's most > engaging tech sites, Slashdot.org! http://sdm.link/slashdot > > > _______________________________________________ > Freetel-codec2 mailing list > Freetel-codec2@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/freetel-codec2 ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Freetel-codec2 mailing list Freetel-codec2@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/freetel-codec2
