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thaaraak / SDR-Transmitter

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multi->add filters #1

Open stojanmar opened 1 year ago

stojanmar commented 1 year ago

Please be so kind and briefly explain why did you remove - multi->add( *lowpass_fir ); I have tried parts of your previous code and it works like a charm. By the way I do not have 8kHz issue here at my proto build. BR Stojan S52UV

thaaraak commented 1 year ago

I had the lowpass filter in there originally to remove higher audio frequency artifacts. It wasn't helping with my 8Khz problem so I just removed it as a part of the ongoing process of elimination. You say you have no 8Khz going on in your radio. Is it the same hardware or your own board? I am running out of things to try on my board ;)

stojanmar commented 1 year ago

Thanks. At some point I will give it a try (removing lowpass filter) and will report you, what difference makes this in my proto. My HW (receiver only) is consisted of: ESP32-A1S on an extension board for esp32-all circuitry except ESP32, Modified Elektor Tayloe Detector, Si5351 standard board governed by ESP8266 bord to control radio via WiFi AF amplifier, speaker, antenna preamplifier with varicap diode tunning ... .... ....) . I can give more details on this here or through our direct email communication. Please indicate what do you prefer. For now I attach here a photo of my proto. It is really ugly for now, but it works really well, even when comparing with popular HAM radios like ICOM , YAESU ...... Interesting, having single grounding point and each module supply line decupling inductor/capacitor even the ESP8266 WiFi operation doesn't make any disturbance at all. I am afraid going to better looking assembly (PCB like) loosing possibly occasional excellent operation. IMG_20230531_133852

thaaraak commented 1 year ago

I love it! Interestingly in my receive only board I had none of that 8Khz noise. I am sure its related to my board layout for the transceiver. Glad you are having success!

stojanmar commented 6 months ago

I didnt see your activity for some time. I hope You are all OK!. Based on your grate work I got inspiration to make an remotely controlled SDR with SSB, AM and FM demodulation. If it will give you some help, I have put some Arduino code for my SDR proto build on a GitHub. Look at: https://github.com/stojanmar/ESP32webSDR