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SDR RXTX
#45
Sad sam se setio da sam i ja imao te probleme sa Si570 i nivoima signala a sve je bilo vise izrazeno kada mi je SDR i onaj CBT prekidac radio na 5V. Poboljsalo se kada sam presao na 3.3V logiku ali mislim da nisam potpuno resio problem (nisam tada imao brz osciloskop pa nisam potpuno to ispratio) ali sam morao da dodam jedan 74AC00 u ulozi logickog invertera gde je ulaz u njega bio otpornicima 10k razvucen na pola napajanja pa sam preko kondenzatora doveo signal sa Si570.
Meni se to resenje nije svidelo iz drugog razloga, sto vise sam dodavao komponente iza tog oscilatora to su mi vise "probijale" frekvencije od oscilatora u sam prijemnik, svi ti delovi su zracili unaokolo po plocici i harmonici mi upadali u prijemni opseg.
Iz tog razloga sam isao kasnije na guscu PCB sa minijaturnim komponentama i sve spustio na 3.3V da bih izbego dodatne translatore nivoa, onda se nesto kasnije pojavio i Si5351 i sve je "cucnulo" kako treba.
Dobre rezultate sam poceo da dobijam tek kada sam oscilator smestio zajedno na PCB neposredno pored 7474, drasticno sam skratio putanju signala (nema kablova i konektora izmedju da zrace unaokolo) ...
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Messages In This Thread
SDR RXTX - by Omegakg - 12-03-2014, 07:19 PM
RE: SDR RXTX - by boraomega - 12-03-2014, 09:57 PM
RE: SDR RXTX - by Omegakg - 12-04-2014, 05:51 PM
RE: SDR RXTX - by Omegakg - 01-13-2015, 10:23 PM
RE: SDR RXTX - by Omegakg - 01-21-2015, 09:55 PM
RE: SDR RXTX - by TDA - 01-22-2015, 12:11 PM
RE: SDR RXTX - by Omegakg - 01-22-2015, 11:28 PM
RE: SDR RXTX - by boraomega - 01-23-2015, 12:13 AM
RE: SDR RXTX - by Omegakg - 01-23-2015, 05:13 PM
RE: SDR RXTX - by boraomega - 01-23-2015, 05:59 PM
RE: SDR RXTX - by mikikg - 01-24-2015, 04:50 PM
RE: SDR RXTX - by Omegakg - 01-24-2015, 10:48 PM
RE: SDR RXTX - by emiSAr - 01-25-2015, 07:45 AM
RE: SDR RXTX - by boraomega - 01-25-2015, 11:54 AM
RE: SDR RXTX - by emiSAr - 01-25-2015, 03:55 PM
RE: SDR RXTX - by Omegakg - 02-04-2015, 10:28 AM
RE: SDR RXTX - by emiSAr - 02-04-2015, 01:10 PM
RE: SDR RXTX - by mikikg - 02-04-2015, 04:39 PM
RE: SDR RXTX - by Omegakg - 02-05-2015, 12:34 AM
RE: SDR RXTX - by Omegakg - 02-15-2015, 11:06 PM
RE: SDR RXTX - by boraomega - 02-15-2015, 11:12 PM
RE: SDR RXTX - by Omegakg - 02-15-2015, 11:15 PM
RE: SDR RXTX - by mikikg - 02-15-2015, 11:55 PM
RE: SDR RXTX - by Omegakg - 02-16-2015, 12:06 AM
RE: SDR RXTX - by Omegakg - 03-08-2015, 05:41 PM
RE: SDR RXTX - by mikikg - 03-08-2015, 09:16 PM
RE: SDR RXTX - by emiSAr - 03-09-2015, 07:17 AM
RE: SDR RXTX - by Omegakg - 03-09-2015, 05:57 PM
RE: SDR RXTX - by emiSAr - 03-10-2015, 12:16 AM
RE: SDR RXTX - by mikikg - 03-10-2015, 12:20 AM
RE: SDR RXTX - by Omegakg - 03-11-2015, 06:19 PM
RE: SDR RXTX - by Omegakg - 02-25-2016, 09:02 PM
RE: SDR RXTX - by mikikg - 02-25-2016, 10:38 PM
RE: SDR RXTX - by Omegakg - 08-10-2016, 08:09 PM
RE: SDR RXTX - by Dackotronic - 08-11-2016, 08:43 AM
RE: SDR RXTX - by Omegakg - 08-11-2016, 09:49 AM
RE: SDR RXTX - by mikikg - 08-11-2016, 10:20 AM
RE: SDR RXTX - by Gosha - 08-11-2016, 12:02 PM
RE: SDR RXTX - by mikikg - 08-11-2016, 12:16 PM
RE: SDR RXTX - by Omegakg - 08-11-2016, 08:09 PM
RE: SDR RXTX - by Omegakg - 08-13-2016, 09:38 AM
RE: SDR RXTX - by mikikg - 08-13-2016, 01:28 PM
RE: SDR RXTX - by mikikg - 08-13-2016, 01:54 PM
RE: SDR RXTX - by Omegakg - 08-13-2016, 06:42 PM
RE: SDR RXTX - by mikikg - 08-14-2016, 11:42 AM
RE: SDR RXTX - by mikikg - 08-14-2016, 11:54 AM
RE: SDR RXTX - by Omegakg - 08-14-2016, 08:19 PM
RE: SDR RXTX - by Omegakg - 08-17-2016, 08:12 PM
RE: SDR RXTX - by Dackotronic - 08-17-2016, 08:34 PM
RE: SDR RXTX - by Omegakg - 08-17-2016, 08:48 PM
RE: SDR RXTX - by Dackotronic - 08-17-2016, 09:02 PM
RE: SDR RXTX - by Omegakg - 08-17-2016, 09:08 PM
RE: SDR RXTX - by Omegakg - 08-31-2016, 09:46 PM
RE: SDR RXTX - by Omegakg - 10-16-2016, 05:11 PM
RE: SDR RXTX - by Omegakg - 10-30-2016, 07:40 PM
RE: SDR RXTX - by Dackotronic - 10-30-2016, 10:24 PM
RE: SDR RXTX - by Omegakg - 10-30-2016, 10:29 PM
RE: SDR RXTX - by Omegakg - 06-07-2021, 03:10 PM
RE: SDR RXTX - by HomeMadeAudioProject - 06-07-2021, 04:58 PM
RE: SDR RXTX - by Omegakg - 06-08-2021, 08:51 AM
RE: SDR RXTX - by Dackotronic - 06-08-2021, 10:48 AM
RE: SDR RXTX - by Omegakg - 06-08-2021, 02:24 PM

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