The new audio amp in the V4 uBITS is a very common design in inexpensive audio equipment for many years. It could be sensitive to power supply voltage levels and if you are using it at below its

Nice! Sure beats the days of drilling and filing of steel cabinets. Bo W4GHV since '54

Arvo, Nice catch...I'm going to move the fan supply to same spot. Thanks Vince N2AIE

Hi, I have V3 with a socketed audio chip labeled as Feb 2018. It worked right out of the box - as advertised. I have not had to make *any* mods at all. I do expect to install the CEC software but

Hello raj, I am very glad to See your fast response. sorry to say I killed my Raduino by myself. Build the bitx in a new case and wiring one of the normally unused cables to the 12 Volt rail. Now I am

Don, I too am hearing the audio in the speaker during transmission. I noticed it first when transmitting digital using FT8, in fact at times the transmitter went into ocillations with the feedback. I

Elmar, Tell us what is the problem. Raj

You should not set the current limit to a lower limit than what the device needs. Probably what is going on is that when you have the current set for 1.5 amps and the rig really needs say 2 amps ,

Hello, my arduino board is defect. how i can buy a new one..? I would be very thankful for any help. with Kind regards elmar—dl2qa@...

WONDERFUL!! This is the mod I certainly will do at first after setting up my ubitx. Again, many thanks, Andy. // hiro, JJ1FXF 2018/06/29 22:45、hirosmb JAZZ <hirosmb@...>のメール:

Andy, Tons of thanks to you. ARIGATO! // hiro, JJ1FXF 2018/06/29 22:38、Andy V. Borisenko via Groups.Io <rw9rn@...>のメール:

Hiro, special for you sound bypassing the built-in amplifier v.4 https://www.youtube.com/watch?v=PsB6_HeeToc&feature=youtu.be

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

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