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Radio interference! Happens on whatever bands you get currents through sensitive junctions.?

Sounds like a Bit of RF is getting in there ...

Hello all,

I just put my antenna in a u-shape in the attic and have a better swr now so I was able to try the uBitX on 40m for the first time.
What I experience only on 40m is that while using WSJT-X my uBitX locks up and gets stuck on TX. All the shorter bands (30/20/17/15/12 and 10) don't cause this issue.

Running CEC firmware v1.095 with Nextion 2.4 display.

When the lock up happens I get the warning message "RIG Control Error, Do you want to reconfigure the radio interface" and when I look on the uBitX the TX symbol is lit.

I don't have any chokes on my audio cables and have been working on the higher bands without any problems.

Any clues?

John

I had an issue with encoders several years ago, in a PIC application.? I looked at the A/B outputs and noticed spikes on the square waves.? Adding two .001uF caps across the outputs to ground, cured the issue.? Maybe that will help?? Most likely you encoder is easy to get to...
Your mileage may vary,
Jim W0CHL

Version 4 board installation is going well and thanks to K5BCQ for an excellent AGC board and SMT components.
However, I am not sure about mounting a remote gain control for this. I wonder what others have done?

Can you tell me what your experience has been connecting this board using the three header pins directly to the main board.

Where have you taken the 5v supply from and the gain control wires from. Have you found it necessary to use screened cable to the potentiometer?

Are you using the original 5K Pot or as shown on the circuit diagram a 1K Pot. Probably doesn't make a difference in this application.

Your findings are most welcome prior to cutting and drilling the board and adding a front panel gain control.

Best wishes Derek G4VWI.

Hi Glenn,

I am using the latest firmware for the Ubitx(nano), v1.095beta the NX and the NXU version.

Only my 2.8" works, not the 3.2" nor 4.3"? will work..

Cant figure out, why 2.8 works and my others wont.
--
73' Bj?rn de PD5DJ

Bravo! An elegant solution!
I've been eying those feeds to the 1602 display. When the display is not being programmed (which is most of the time) they could be available for some things. -Don

Has anybody with this combination of Raduino noticed that the Encoder skips steps when tuning up or down.? ie the tuning is not in the nominated 100Hz steps but often skips 200-300Hz or more, unless the encoder is tuned VERY, VERY slowly.

I have tried several Encoders, but with the same result.?? I "think" the Sketch uses polling to read the Encoder which may be the problem, but interested to hear if others have noticed this at all.

glenn vk3pe

Very well documented Patrick! The original C50 and C63 are not polarized. C250 is part of the sidetone filter and would not cause your problem, but C50 is certainly suspect. Try substituting something for C50. Anything from 0.1uF to 10 uF. If you use a polarized substitute put the positive side toward Q70 and R50.
Do you have any signal tracing equipment (tone, oscilloscope, outboard audio amp)? Those would be quite helpful at this point and would have saved you a lot of work. It appears that you have done everything properly but it is 3AM and I am not competent enough at this time to be sure. I'll keep studying your message. 73, Don

Specificially this section of the web page

1.1 uBITX firmware for Nextion LCD
uBITX firmware has released .Hex files for various LCD since 1.073Beta version as below
Since Version 1.091, uBITX Firmware release .Hex files with file names ending in _NX.hex.
??
The file name ends with _NX.hex is uBITX firmware for Nextion LCD.

You need to program the uBITX NANO with the correct Nextion code also.

See this page

vk3pe

My apologies for the stream of consciousness nature of these last few posts. But, if it turns out one of the power converters can't handle the load, I realized the uBITX does not use a center tapped output transformer. I might try supplying each half of the push-pull finals with a separate boost converter.

That will save me the gas of going to the post office to pick up another order of boost converters :)

Tom, wb6b

OK, I am stumped and I could use some help. For context, the issue is no Audio at all when powered on ANT attached or not.

I annotated this drawing to match my pictures.


Here's what I've tested all but the TX test was without mic attached:

1. Rework
   • I resoldered a few wires that didn't look great.
   • I cleaned up a dropped blob of solder that was all over C250 and R251 on the main board. (oops)
     Ultimately, I had to pull C250 off the board, clean the solder off the board and reattach. The solder caps came off C250. I rebedded it in solder on the pads as best I could. It is firmly attached and continuity around it is correct. <<-- This might be it. Not sure.
   • I cleaned the board and main board anywhere I did work with rubbing alcohol and a q-tip
2. I replaced my TDA2822 just to see and it had no change.
3. General Continuity Tests
   • I have continuity from the outboard end of the wire (from the main board) to the next component on the add-on board (i.e., across the next trace) as follows:
     • Blue? to R5
     • Brown to R3
     • Black to C1
     • Purple to Bottom right leg of Q3 (as in drawing above)
     • Yellow to R2
     • Orange to top of Q2
   • My trace breaks on the main board are all good. No continuity across those.
   • My jumper wires at the breaks are good. Continuity across those tested across and not on the jumper wires.
4. Power Tests (RX)
   • I DO NOT see any voltage on Blue wire to the Black wire (GND) on the board. This makes sense .. its on the TX side.
   • I DO see 12v from on the Brown wire to Black wire (GND) on the board. This is the RX side so again, that makes sense.
5. TX Tests
   • PTT does enable TX on the display
   • PTT turns on 12V on the Blue TX wire (see above)
   • PTT turns off 12V on Brown RX wire (see above)?
6. Speakers
   • I tested with a mono speaker that I've used before
   • I've tested with a stereo headphone that I've used before

My fear is that I've messed up the capacitors (that's what those brown things are right?) at C250, C50 and C63.

Am I correct in my sizing of these from the V3 schematic (http://www.hfsignals.com/wp-content/uploads/2017/12/ubitxv3.pdf)
C50 &?C63 - 1u
C250 = .1u

Am I also correct that C50 and C63 are polarized? I could have screwed that up when I desoldered them, dropped them 300 times before I barely stood them on end and tombstoned them. ;)

I'm stumped and could definitely use an Elmer.
Thanks!
Patrick W7PEA

Thanks, that is good to know.

An additional thought. There is a good chance the rating is honest, but referring to the input current. The output is not isolated so there is no opportunity to run this at 12V out added to the 12V already from the main power source. In that case a beefier boost converter will be needed. I believe Amazon has higher power boost converters for a reasonable price, too. Just not at the impulse buy price these were at. I'll still find uses for these and the buck converters I bough at the same time. They will live happily in my parts box for future use. Load testing will tell what they can do.

Has anyone been able to parallel these and keep the load current equally balanced between them?

Tom, wb6b

Hi Jim
Re. noise,? I am using a 14.8v lithium pack and used of these to drop that to 12volts for the main board (finals stay on 14.8). It was fine for that. Not a trace of noise that i can detect.? The uBitx far outperforms my venerable TS-680 on receive with respect to noise and pretty much everything else in fact.

Jim

?

I have some Nextion Display (Basic) 2.8" / 3,2" / 4.3"

I Succesfully programmed the 2.8" variant with the firmware of KD8CEC. and works great,
I have also programmed the 3.2" and 4.3" with adapted KD8CEC firmware, and also the firmware of KN4UD
But they both dont communicate with the uBitx

All nextion's where programmed via the serial cable, So I know that port is working ok.

What could be wrong?

?--?

73' Bj?rn de PD5DJ

Lovely solution!

Also don't forget about D0 and D1.

73 Nick Vk4PLN