Ramon, íEstoy interesado! Gracias, Rafael

#v6 #esp32 #raduino32

Ramon, Is the PCB shared in EasyEDA up to date? I am thinking on ordering some. 73 Rafael Pinto

#filters #calibration #raduino32

Farhan, I know you might have answered this before, but what graphics API are you using to fill the framebuffer for the display. While eagerly waiting for the official sbitx, I am thinking on using a

That would be the only downside I'd point out. Rafael PU1OWL

Farhan, Some people is testing with IRFZ24N and IRFZ44N, and found they can put out some 50W or more. I am kind of skeptical, as their input capacitance are as high as an IRF530. Probably they will be

I had it locally, from an new old stock seller. I had it for a year or so, as I was planning to build a VHF amplifier. I didn't had any oscillation until now, but I'll take a look when I get it finish

Max It was bad phrasing from my part! I am not a native english speaker. What I meant is that operating on 40m with such 30MHz LPF would be problematic, as the spurious emissions on 15m would cause in

Max, It is actually the opposite: it doesn't. When building linear amplifiers the components are not really linear, so they will generate harmonics. The symmetric topology used on those chinese amplif

Loris, Actually, looking again at the offer, it seems to have a crude low pass filter, probably on 30MHz, which can be problematic for 40m, as its third harmonic will be inside 15m... 73 de Rafael

Loris, I am building one of those Chinese aplifiers, but in mine I replaced the IRF530s by an MRF9120 (already had it). It does work, but: the input power has to be below 5W (or even less), so an atte

Anders, Are you sure it was interference from the radio itself? Commercial radios operate in AM, which sends out a carrier. That carrier, when demodulated by a SSB receiver can be translated to a sing

Love that! Happy 2022 to you too 73 de Rafael - PU1OWL

Rafael, This Morse decoder is really good ==> https://morsecode.world/international/decoder/audio-decoder-adaptive.html and it is open source. https://github.com/scp93ch/morse-pro I didn't look at the

I had this weird idea of having some external BPF on the uBitx for 15m, but never went ahead with it. Thinking again it could be rigged just by the T/R relay, but then I would lock the uBitx...

I used my uBitX for FT8 a lot! Just two cables straight from headphone and mic jacks to the computer soundcard. Just as easy... Where I live, the QRM level is absurdly high, and my antenna options are

Sorry! Wrong link! The right one is http://www.nd6t.com/uBITX/AGC.htm

http://www.nd6t.com/bitx/AGC.htm 73 de PU1OWL Rafael

Hi! You can check the pinout using the schematics at https://www.hfsignals.com/wp-content/uploads/2019/12/raduino_tft.pdf and comparing with the main board schematic at https://www.hfsignals.com/wp-co

Ford, I tried the same circuit and got the same puzzling results, until I figured it out! The problem is that when the diode is forward biased its impedance become very low, so low it loads your divis

I am so glad I decided to share with you folks. That got me some time to review my design. Well, my design is terribly wrong. The output switch would short circuit the amplifier output and it would no

#homebrew #rf