IIRC the si4463 has a zero IF mode at the price of some reduced sensitivity. I cant remember if it applies to FSK modes. Might be worth looking at.
Also the IF can be changed to affect the rejection behaviour. Sebastien On 09/03/2018 22:37, Alan Beard wrote: > *Hi Leon and all,* > * > * > *I'm looking at the ** > *Si4464/63/61/60 data sheet * > * > * > * > * > * > * > *https://www.silabs.com/documents/public/data-sheets/Si4464-63-61-60.pdf* > * > * > *On Page 8 we have "Image Rejection" at only 35db and 55db corrected.* > * > * > *Since their IF is only 468KHz, it's not possible to filter it our with > the RF front end.* > * > * > *Would better Rx performance be had using a Superhet design. A 45MHz, > 21.4MHz or 10.7MHz IF* > *where we use a crystal filter and 'completely' loose that image?* > * > * > *Alan VK2ZIW* > * > * > On Fri, 9 Mar 2018 18:06:30 +0200, Leon Lessing wrote* >> Hi all, >> I have about 90 pieces of stm32f405rgt which is the 64 pin device, I > see it is "compatible" with the stm32f722 >> >> Having worked a lot in the low volume/cost arm world, I have a pcb > carrier roughly 1x3 inches, it has the usb plug on it and the xtal, swd > etc. >> >> It helps you do extreme speed hardware development with minimal > effort, so porting the design to another cpu it not a big issue. >> >> Yea I know it is an ugly shortcut, but it works well when your product > must pass emc tests, well sometimes. >> >> Them RT1050 silicon looks damn cheap compared to the stm devices, a > good reason not to use cubex :) >> >> Leon >> >> > >> >> Leon Lessing >> 雷立安 >> ZS6LMG/AC9GU >> >> On Fri, Mar 9, 2018 at 10:44 AM, glen english <g...@cortexrf.com.au > <mailto:g...@cortexrf.com.au>> wrote: >> > > Agreed. > > > > skip the F4 and go straight to the F7 , unless cost is an issue. > > > > CODEC2 was almost 1.7x the speed on the F7 compared to F4 for same > clock . > > > > The H7s are expensive, don't you think Danilo ? I am going RT1050 > for next design.. $5. k > > > > On 9/03/2018 7:05 PM, Danilo Beuche wrote: > > > > > > 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 <tel:09.03.2018%2007>: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> > <mailto: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> > > <mailto: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> > > > <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 > <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 > <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 > <mailto:Freetel-codec2@lists.sourceforge.net> > > https://lists.sourceforge.net/lists/listinfo/freetel-codec2 > <https://lists.sourceforge.net/lists/listinfo/freetel-codec2> > > > > > > > Alan > > Evil flourishes when good men do nothing. > Consider the Christmas child. > --------------------------------------------------------------------------- > Alan Beard Unix Support Technician from 1984 to today > 70 Wedmore Rd. Sun Solaris, AIX, HP/UX, Linux, SCO, MIPS > Emu Heights N.S.W. 2750 Routers, terminal servers, printers, terminals > etc.. > +61 2 47353013 (h) Support Programming, shell scripting, "C", > assembler > 0414 353013 (mobile) After uni, electronics tech > > > ------------------------------------------------------------------------------ > 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
