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Post by Oscar Bravo on Apr 27, 2021 22:10:46 GMT 2
DAB+ | the DAB Shield |
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Post by Admin on Apr 28, 2021 7:10:43 GMT 2
Tecsun H-501/H-501xFM/AM/LW/SW/Audio Player with Bluetooth & Stereo Speakers Comparing Tecsun H501 with S2000 radio on FM
So nice in chinese
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Post by Oscar Bravo on May 1, 2021 6:58:24 GMT 2
FM DX TEF6686 vs ONKYO T-4670 (mod)
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Post by orpheus on May 1, 2021 14:06:43 GMT 2
Salutare ! M-am inscris si eu pe forumul acesta pt ca am vazut ca exista aceasta sectiune unde se vorbeste despre TEF6686. Am realizat si eu acum ceva vreme un receptor portabil cu acest chip (modul de pe aliexpress), pe care l-am postat pe un forum nemtesc sau ceva. Vad ca unul din membrii forumului, si anume Spectrum, a postat aici "creatia" mea, putin mai sus . As vrea sa intreb, din experienta dvs, a incercat cineva vreun modul cu TEF6686, probabil recuperat din radiouri auto, care are pe intrarea FM acel transformator de adaptare ? Si daca da, este vreo diferenta semnificativa ? *** Edited for fair reasons TEF6686 portable radio Some FM scan and Settings showoff
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Post by Oscar Bravo on May 1, 2021 16:02:24 GMT 2
Bravo! Bun venit si felicitari pt. noul proiect cu TEF6686 !
Intrebare absolut fireasca pt. orice "connaisseur"
Daca te referi la transformatorul cu miez reglabil #A1313AN-0001GGH=P3 ca in schema asta ...
fata de schema utilizata in modulele de pe Aliexpress, da, am testat eu, chiar mai multe montaje. In aparatele auto Pioneer cu TEF 668X de regula au transformator, unele cu miez reglabil altele fara. Unele, desi au cablajul proiectat optional si pt. transformator au folosit solutia fara ... Diferentele sunt mici
Mai mult, am testat decupland filtrul trece jos de LW/MW/SW lasand intrarea "curata " exclusiv pt FM, intrarea AM conectand-o la un pin liber din modulul cu 19 pin. DSP receiver increased amplification and band-pass filter test reportOrientativ, diferentele sunt cam ca aici ...
Pt. ca Q-ul maxim este in 88-108 Mhz se inrautateste receptia jos in banda OIRT !
P.S. Am mutat continutul postarii lui Spectrum acolo unde-i este locul ! Am apreciat si faptul ca te-a preocupat subiectul prezent si pe forumurile chinezilor despre consumul care cade pe sursa interna din modul, insa TEF-ul, asa cum am mai comentat si eu, a fost proiectat pt auto si cam papa " bacteria "
Succes in continuare !
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Post by orpheus on May 1, 2021 17:25:02 GMT 2
Multumesc pt aprecieri Da, despre acel transformator este vorba. Multumesc pentru raspunsurile detaliate ! Am scapat de intrebarea: "to be or not to be cu transformator", deci stau in banca mea si las asa ca e ok. Da, stiu ca aceste cipciripuri consuma multicel, d-aia am si facut teste si am cautat un stabilizator de 3.3V cu dropout cat mai mic posibil ca sa pot face in asa fel incat tot montajul sa functioneze de la o singura baterie 18650. O mica problema, totusi, ar fi ca nu e utilizata toata capacitatea bateriei, ce am vazut prin graficele date de producatori, sunt considerate consumate atunci cand ajung pe la tensiunea de 3V. Avand sursa de 3.3V acolo si un dropout de vreo 60mV - 70mV, sursa aia o sa functioneze "bine" cam pana pe la 3.37V (din ce am testat eu), desi am lasat sa coboare si mai jos de atat, iar modulul a functionat in continuare pana la vreo 3.1V sau ceva, moment in care "a tacut", dar inca raspundea la comenzi pe I2C. In datasheet spune acolo ca tensiunea minima ar fi 3V. In fine, cam asta e treaba...
Nu am pus Radio Text deoarece am vazut ca majoritatea posturilor din Bucuresti nu scriu nimic relevant la RT, nici ceasul CT nu arata ce trebuie, asa ca nu am mai pierdut vremea. As mai putea adauga ceva cu schimbatul pasilor 10kHz pe FM, 1kHz pe AM/SW, desi, din nou, nu vad rostul pt ca oricum nu stie de SSB, iar acolo ar fi fost relevant, asa ca nu m-am obosit. Sensibilitatea pe Lungi/Medii mi se pare chiar buna in comparatie cu multe porcarii pe care le-am avut de-a lungul timpului. Chiar si pe Scurte, sensibilitatea pare ok, desi nu am un aparat foarte bun cu care sa compar, doar un Tecsun PL390 cu care pare sa fie cam la fel pe SW. Ce am mai observat pe SW a fost ca pe frecventele de 7230-7260kHz aud Cultural 101.3MHz in anumite momente, bineinteles, distorsionat, pe Tecsun nu se intampla asta. In rest este ok. In datasheet-ul lui TEF6686 nu dau schema de aplicatie, am gasit schema intr-un datasheet al lui TEA6850, care pare sa fie chiar cea utilizata in modulele de pe Aliexpress. In acel datasheet dau mai multe detalii despre cipcirip, probabil este la fel sau aproape la fel cu TEF6686 in unele cazuri, nu stiu sigur...
Da, ce sa mai spun, in concluzie este un chip bun, mai ales pe FM, de mult voiam sa am un radio portabil care sa mearga asa pe FM si sa nu dau sute de dolari pe Sangeanuri sau mai stiu eu ce, care oricum nu sunt cine stie ce pe FM.
TEF6686 portable radio Shortwave bandscan TEF6686 portable radio Long Wave and Medium Wave night time bandscan
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Post by Oscar Bravo on May 9, 2021 15:10:28 GMT 2
FM DX TEF6686 vs ONKYO T 4670 (mod)
( same antenna + splitter )
NB:
I used in this test the MPX output of TEF6686 (and of course the correct external hardware processing including the 50uS)
thus bypassing the internal digital audio processing and implicitly those annoying effects of fierce softmute on weak signals.
Unfortunately, under 1 uV, the performance of TEF668X decreases dramatically !
The code used is hereRememberLet's go back in time some years ago ...
( TEF6686 and I2C Arduino Controller for XDR/NXP/TEF GTK user interface )
Test with RDS Spy
( RDS extracted from MPX - DAC_Left : FM MPX (DARC) )
Link
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Metatron
New Member
Meserias
www.activenews.ro
Posts: 98
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Post by Metatron on May 22, 2021 0:15:15 GMT 2
HF SDR Transceiver RS-918 mcHF
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Post by Oscar Bravo on May 23, 2021 9:49:57 GMT 2
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Metatron
New Member
Meserias
www.activenews.ro
Posts: 98
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Post by Metatron on Jun 25, 2021 10:58:32 GMT 2
Tecsun H 501X View of the Internals electronics
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Metatron
New Member
Meserias
www.activenews.ro
Posts: 98
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Post by Metatron on Jun 25, 2021 11:09:19 GMT 2
Tecsun PL-330
You realize it's difficult to justify price for Tecsun PL-990x and Sangean ATS-909X2 Key differences Tecsun PL-680 PPL Synthesized receiver VS Tecsun PL-330 DSP portable receiver
Should I get Radiwow R-108 or Tecsun PL-330 portable receiver ?
Bonus
Degen DE-1103 PLL vs Si4732 DSP Experimental Receiver (SSB/AM)
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Post by Oscar Bravo on Jun 30, 2021 9:17:47 GMT 2
Build The Best CB Antenna EVER! The Half-Wave End-fed is an excellent antenna for CB, best used vertically. The 49:1 transformer is easy to make and affordable. This is a full size antenna with a low take-off angle great for skip and local communications. Wire length usually falls between 4.5 and 4.8m. Starting wire length in feet is 468 divided by the frequency in MHz. Check SWR and cut a little bit at a time. Do not use a metal box or expoxy. Hot glue is ok. Do not use another material than 43. The FT-140-43 can probably take up to 100W SSB, 70W AM/FM. For more power you would need an FT-240-43 or FT-240-52, even three FT-240-52 stacked together, but honestly it's not needed and illegal on CB! Do not use a CB amplifier as those are splatter boxes, and again, not needed. Military manpacks output 25-30W for a good reason, it's enough! 12W SSB legal power is plenty with this antenna. Get a 6m cheap telescopic fishing pole and you're in business!
Bonus
Cheap Home Brew CB / 11m antennas for Attics and Lofts (also for 12m and 10m too)
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Post by Oscar Bravo on Sept 13, 2021 6:53:51 GMT 2
Ham Radio - Airspy HF+ Discovery SDR
Setup and use on Linux
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Post by Oscar Bravo on Oct 21, 2021 22:09:52 GMT 2
Mini SSB receiver ATS-25 (LW/MW/SW/FM) Bonus
MLA 30 Plus Vs YouLoop with cheap LNA
Build a Magnetic Loop Antenna with Remote Wireless Tuning - Practical Guidance
Types of Magnetic Loop Antennas
📡 Active Mini Whip Antenna 20khz at 200 mhz 💡 Installation Tutorial 💡
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Post by Admin on Mar 6, 2022 9:58:15 GMT 2
Decoding HD Radio on Windows with RTL-SDR USB
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Post by Neo Mao on Mar 15, 2022 22:38:36 GMT 2
XIEGU X6100 - SDR portable HF transceiver (review)
Bonus
Wow! 9230 km DX on 5W and MC-20 Magloop Antenna!!
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Post by Oscar Bravo on May 9, 2022 11:29:14 GMT 2
AM/SSB/FM (LW, MW, SW and VHF) receiver with Seeeduino and SI4732/SI4735 device
Bonus
Receptor DSP PRO 3 ST( TEF6686 )
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Post by Oscar Bravo on Jun 23, 2022 18:55:53 GMT 2
Introduction to Antenna Modelling - MMANA-GAL -
Bonus
Evolution Of The Radio 1893 - 2022
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Post by Oscar Bravo on Jul 3, 2022 21:17:14 GMT 2
Ce mai puteti face in vacanta ?!
O distractie veche de aproape un deceniu cu serverul TCP pt. interfata XDR-GTK
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Post by Oscar Bravo on Jul 24, 2022 5:37:49 GMT 2
SDR++ Server | Remote RTL-SDR SDRPlay LimeSDR AirSpy and More!
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