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I have ?v4. big problems with sound. if you bypass the built-in audio amplifier, then you can use it. for example, a video from my uBitx v4 https://www.youtube.com/watch?v=mBi5NGL0bK0

IC. I’ll pay my attention to this distorted audio issue for a while. Any other known hardware problems on uBITX r4, the latest board? Many thanks, MVS. // hiro 2018/06/29 13:35、Mvs Sarma

There are few members who reported the good functioning of Audio amplifier. we need to check whether the element is wrong in design or some pieces went out with distorted output. Regards MVS Sarma

Installed raduino v1.27.1 and it works fine. No RF noise burst on transmit. Great piece of software Allard.? Now looking to do more hacks of the hardware to take full advantage of the software

Jack, Thanks for ur quick reply. I read some articles of mods, but couldn’t recognize which are necessary mods for uBITX r4 board. Does the r4 board still need to be fixed for the distortion issue?

http://www.contextengineering.com/

Most of the mods that have been made are summarized at: ubitx.net Jack, W8TEE

Hi, all. I’m really new to uBITX and planning to place my order to hfsignals.com very soon. Then please share its known hardware issues of uBITX r4 that I need to modify or solder. Thanks in advance

All: Several people have asked about compiler warnings they are getting, like: ????????warning: ISO C++ forbids converting a string constant to 'char*' A variation on this are the "deprecated"

After I sent this it dawned on me to check the 12v supply as well. Sure enough, it's there too. FWIW, I'm powering it off a 20A Astron 13.8v linear power supply and feeding it into my old Heathkit

One last thing, testing CW uses none of the IF and modulator so if it works you can't know if the IF is fine. MUST test using SSB.? Ideal bias for Q20 will have the collector at about 6V (+-1V).? To

R23 change yes and 18 ohms may be too low still. Likely operating point, R21 may be too low. Before you go to band pass filters try one thing... pain to install, Low pass filter between the junction

Sure does, Mark. Now to find where it's coming from. Please check the 12 volt input pin of the Raduino's 7805. See if it is there, too. On my AGC boards I don't have ANY bypassing on the 5 volt feed

Don... I finally had a chance to start looking into this on my ubitx (I'm seeing the same issue). I managed to borrow a scope and putting it on the 5v supply seems to indicate that you're right. I see

CIRCUITBOARD DETAILS. Hello Alan. Thanks for your interest. Attached is a wiring diagram (more useful than another schematic), an underneath view of the circuit board which should help with your

Thank you Allison for the clarification. I read the thread about the mixing problem and understand where the problem is. Maybe I will try to play around with bandpass filters, but this is no priority

Not to beat a dead horse but are there any shipping issues. Last I read was that the backlog was gone. I placed my order last week and have yet to receive a notice that my ubitx has shipped. Thanks

When in use, those rectangles clear up nicely. It's a matter of viewing angle. The pictures were from too straight on to see the display clearly.

And that was the wrong link... Sorry Here is what the link should be: ubitx.net/fix-fix-uneven-tx-output-across-bands/ Marco - KG5PRT