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Jack, Thanks for your comments. I am not complaining at all. I just wanted to know what mods I need to do to have better ubitx functionalities. I appreciate a lot for the engineers who designed this

Yesterday, I set up a separate antenna for the uBitX on my front porch, to test battery operations, potentially to use the rig in the field. The antenna I set up was not ideal, and my Elecraft T1 ATU

Don’t forget those emitter resistors, that Add additional voltage drop. Someone suggested using a bit of feedback, I didn’t look at the circuits, but wouldn’t that be one solution?

It seems there are still people who complain about the audio. Since most of the mods can be done post-construction, I'd put it together and judge for yourself. It's not an issue for me as the JackAl

Thanks Mark. I've usually try to use 14 AWG wire (or larger) for power feed and a nice big capacitor right after the power switch. In the BITXs I use an 8 volt pre-regulator to feed the Raduino.

Mike: Thanks for the link. Great job! 73, Alan N4AYE

we will probably have to increase the emitter resistors in that case too. The other option would be to use slightly higher bias voltage rectifiers like the 1N4001s. - f wrote:

Farhan, It was too much! Q72 started to get hot but not Q73. Means they are not matched. Iq went up almost 100mA. So I used a pot where 47 Ohms seems fine. What may work that instead of these diodes

What if we use three diodes instead?

Oms Kindly share us the RX & TX reports of uBitx set ,Operated on original boards? i am expecting on the original boards results. de vu3pen sridhar

Jack, I’m taking this idea for which thank you. What about the noise level which other radios or PCs places around the uBITX receive? // hiro, JJ1FXF 2018/06/29 14:58、Andy V. Borisenko via

Yes, you are right, Raj. I’ll set up the uBITX as it comes at first. My only concern was if I need to solder or mod at my first setting-up bcoz v4 is rather new design, I’ll easily get confused

Hiro, First connect up the board and get it working in stock condition and when all is well and running look for mods that you may want to try. I have posted the audio distortion fix just now. Its

Got back to town and plugged in the uBitxr4 and found the audio distorted. Poking around the finals I found that the two diodes D15 and D16 gave only a drop of 1.2V total but the final transistors

Many, many thanks for ur comments, Andy. Now I understand that either a cheap speaker or bypassing built-in amp is the solution of the synchronized noise issue. Since this fix isn’t hard one for me,

in the message #52671?solution a problem: "gentlemen, the question is closed. I connected the cheapest computer speakers with a built-in amplifier and sent a signal to them bypassing the amplifier

I want to say that?synchronized noise?is a problem with an audio amplifier ?v4. tonight I will try to make a video where the built-in audio amplifier is turned off, and the sound goes through an

Very much appreciated, Andy. I’d like to compare its before/after. What do u mean by “no problem of audio”? Do u mean to say the synchronized noise is the spec of uBITX? // hiro, JJ1FXF

Hiro if necessary, I can shoot the video with an external (bypassing the built-in) audio amplifier. but believe me, there is no problem with audio.

Do all of the v4 have this distortion issue? Or only for the certain lots? Thanks, Andy. Ur videos helped me to understand what the distortion issue is like. // hiro, JJ1FXF 2018/06/29 14:47、Andy V.