We feel your pain...

Thank you both for the great info!?

once things slow back down again, I’ll get to work on figuring it out

I have video of this issue but it won’t fit here.

Purchased a V3 from a ham on QTH. Told it was 2 weeks old and it’s of course built and tweaked at the factory.

S/N 0994 so someone could ascertain it’s true build date.

It has several issues but the most glaring one is internal receiver noise.

Read all the forums, blogs, etc.

5v Buck boost module has a systemic problem. As some users units exhibit the exact issue I’m observing. I’m guessing some V3’s work or there would be more of a footprint here on this issue.

Tried adding of the suggested caps on the enable line also on the input and outputs of the 5v bb module. Slight if any improvements. Still unusable on 40 meters. Its absolutely worst there.

Purchased the suggested Drok module. Still problematic. Used RC low pass on the output. Some improvement but come on.

Im spending too much time on the hardware as I purchased this to help my Linux bone.

No issues updating the V3 or Pi configuration. Some struggle with the time zones correctly being displayed. No problem as having Linux experience helped.

Is there anyone who has a handle on this internal noise problem??

Dont need “what worked for me” comments.
Whats the solution?

Should be relatively easy for the folks who designed this to weigh in and implement a hard fix.?

Not complaining just need pertinent help.

Many other issues with this radio that more than likely can be fixed via the code.

AGC after unkey hangs to long except when AGC is off. Easy fix.

No S meter. Should be able to implement that via code.?

Of course the screen resizing for WJST etc.
Just to mention the obvious.

Anyway if your going to buy one of these and aren’t ready to deal with these problems?
stay away until it’s more mature. Both hardware and software.

Im just trying to get it function hardware wise before starting any major code experiments.

Congratulations on getting a clean sweep in 13 Colonies and you should get some kind of extra points award for working it with the home brew sBitx.

Fantastic work!

73

On Tue, Jul 9, 2024 at 06:24 AM, Tom Crowley KT4XN 1738 wrote:

It appears that a portion of the keyboard displays on the top line of the sBITX.? hitting keyboard twice, brings the frequency line back.

?

Tom KT4XN

Ok thanks Tom. The same issue existed on the stock, 32 bit version as well. I will have to look into this.


-JJ

开云体育

Hello Tom,
1) If arduino nano is running on 12V, but not via usb (and if usb connection is OK.) -? seems like something happened to arduino nano (power circuit?? MS1117? diodes?). Do You have USB power measure tool like Keweisi? So, You could measure (if any) current consumption by arduino nano via USB. Anyway, if nano is NOK it is not expensive to buy, reflash and replace.
2) Low RX might also be caused by Q10 transistor failure (and next ones Q11, Q12.. in RX chain). Please check voltages on them.

Regards
Tomasz

Steve, plunge in!
The development code is in farhandev branch.
I now have a seperate thread monitoring the keyer lines, it sets a? flag that is picked up by the signal processing loop in get_next_sample call (if I remember the function name correctly) to begin the key up/key down of the cw carrier.
There are many new easters in the farhandev branch. Some many not be usable. There is a qrp 60M band and AM mode too.
I hope you are comfortable forking on the github. Just start from there and work your own branch.

Hi Tom,

First, it is not a good idea to power the uBitx through the USB connector on the back of the radio.? That would be back-feeding the power through the 5-volt regulator on the Raduino board.? That can damage the regulator and ultimately cause it to fail and apply the full 12 volts to the Nano.

From what you have described, I would suspect that the power from the nearby transmitter damaged Q90.? Check to see if you have a short to ground on the base of Q90.? The alternative is to test following the directions on this spreadsheet from VU2ZAP:
/g/BITX20/files/VU2ZAP

The V6 and V4 have similar circuits for the transmitter, so the V4 measurements are good.

73
Evan
AC9TU

Hi all -?

After a fun weekend working the 13 Colonies (clean sweep on HB sBitX- I think I win that section of the contest!) - I am turning to the final bits and bobs of the build, the SWR bridge and the RTC.? I build the directional coupler today.? ?I ran in to trouble trying to compile the swr_bridge.ino for the ATTYiny85.? I initially couldn't find the correct board manager.? ?If interested I posted the answer on the swr_bridge.ino thread.

I should have the SWR bridge working tomorrow.? The RTCs arrive tomorrow and that *should* also be straight forward.??

I've ordered a couple of wood project boxes from Bezos and plan to shield with copper tape, N2CQR style - thanks Bill.

Socketry is the worst part of a homebrew project!

Here is the directional coupler.? I'm getting good at building these - I led a Vienna Wireless Society Makers group project in a stand-alone swr/watt meter project a few months ago - using essentially the same bridge circuit with my own AtTiny code.

73,
Dean
KK4DAS

Trying to bulild the swr_bridge.ino -

Had to do a bunch of searching for a board manager - for anyone needing it details are here:



The older version of ATTinyCore from drazzy does not currently load in the Arduino IDE board manager.? Looks like a certificate problem.

You know I am getting bored with my sbitx build when I'm working on the SWR meter and the RTC.? ?

73,
Dean
KK4DAS

Took the sBitx out for a POTA activation this morning.?

The CW keyer on the dev branch is substantially improved, but I did find it was still making errors in both iambic modes. It did help to slow down to 20 wpm, but even at that speed I was still experiencing 1-2 errors per QSO.?

Given this seems like an area of active development, I am wondering if it makes any sense for me to attempt to improve the software, or if I should just hold tight for now. Happy to contribute in whatever way seems best.?

Steve, W4SGN

So, I had my uBITX powered only by the USB cable and was listening, turned it down (but not off).
Sometime later I had transmitted on another radio and heard either a click or a pop from my uBITX.
Now anything below about an s7 the uBITX can't hear when connected to 12v (it's completely deaf when only connected via USB now)
Any suggestions as where to start troubleshooting?
TX is fine.

Thanks?
Tom?

Thank you Gyula

sbitx commands can be found here:
more help in the Wiki: ? /g/BITX20/wiki/30883
--
Gyula HA3HZ

Hello,
Is it possible to enter direct frequency?
I can't find any Keypad for it.

thank,
Nir? 4X1FK

This picture says more than any words.
--
Gyula HA3HZ