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I have spent so many hours attempting to get this to work after installing the 2.8" Nextion and the appropriate software. I ended up with no receive except noise. No signals to be heard anywhere, not even WWV on 10.0
Calibrated and recalibrated, and then again. Changed the Arudino. Reload the sketch.
Is there someone who would be willing to take a look at this in person? I've had advice from the experts but now it's time to give it over to a hands on person.
If not, I'm going to sell it, cheap.

Grover K7TP

Grover,?
Sorry to hear your frustrations.? I am hesitant to take on someone else's radio to repair.? I am not comfortable working on another's rig, afraid that I will damage something that would be hard to repair.? I am really confident making changes to my own equipment, as I can always patch together something to make it work.? The result is not always pretty.

I would hate for you to give up when you are so close.? A deaf, receiving only static uBITX is almost always due to calibration.? The 3 steps outlined in Farhan's video are required to be done in order.? If you do not have access to WWV, then any known AM statin can be used, including a rig in your shack, including a signal generator.? You just need to know the frequency of the AM carrier to do the calibration.? I have used my IC-7300 into a dummy load at lower power to set up a uBITX when WWV is not able to receive.? The WWV signal will just be more accurate.? Whatever you do, do not transmit full power on a 20watt+ rig with an antenna connected to the uBITX.? Q90 is easy to fry as there is no protection while in receive mode.? Back to Back 1n914 or 1n4148 diodes across pins 12 and 16 of K1 can prevent the issue.? That should be in the antenna circuit only on receive, so have no effect on the transmitter.

I have found for my QTH that when 10MHz WWV is not receivable that WWV on 5MHz usually is.? The third alternative is 20HMz, for me only during the day.? You could also try the 2.5Mhz and 15MHz frequencies as well.

Here is the link to the Ashhar Farhan video:


Good luck and sorry I have not been able to help you fix your rig.
73
Evan
AC9TU

Hi Grover,

What version of the uBiTX do you have?

Perhaps this is a dumb question, but did it work before you installed the Nextion? If so, does it work if you switch back to the stock hardware configuration?

Finally, where are you geographically located? Hard for anybody to volunteer their time hands-on without knowing where the rig is :P


Reed

It's getting better. With the original screen and software I am able to calibrate the radio.
So now I'll go back to the Nextion install and report back tomorrow.
Thanks guys,
Grover K7TP

Can the numbers that I use when calibrating the radio using the CEC software and original TFT screen be used with the Nextion? Are they even close?
It would be a good starting point for setting up the Nextion calibration.
Thanks,
K7TP
(p.s. The radio is working well with the original software and TFT screen now)

The short answer is yes.? The longer answer is that as long as you use the same Nano, the values are stored in the EEPROM area that is separate from the program area.? If you do swap out the Nano, then you need to recalibrate.? The values used before can be loaded as the calibration data to start.? What I am trying to say is that if you load the CEC software on top of the stock software in the Nano that was used for calibration.

Remember that to get the best calibration for the frequency, you should set the BFO tuning value lower than normal, zero beat to calibrate, then set the BFO tuning back to be centered between 300 and 3000 Hz.

Question for a v6 owner, does the new software show you the current calibration/tuning value, or does it go back to default as all of the prior stock versions did?? If the latter, then I other than writing down the value, there is no way to save it for later display.

73
Evan
AC9TU

Hi,

I did the calibration on V6 with the stock software and it did not remember of show the previous cal numbers for the VFO. I had to write them down. As I recall the BFO was less troublesome. I might recall that wrong. I was wrong once before you know ;)

73,

Bill KU8H

bark less - wag more

Stock v6.1 code reverts the calibrations. My version does not.


Reed

Hi Reed,

I installed your software in a V6 for another ham. Nice job:)

When you get one for V3 and stock display please let me know.

Maybe I can learn enough about the programming top transplant some of your routines into the software I have.

73,

Bill KU8H

bark less - wag more

Guys, I need to understand a couple of things because I'm certain that all this is unsuccessful calibration.

1. Are the calibration numbers I'm getting from the stock software (6.1) transferable to Reeds software?
2. Can I use Bitx Manager to do this?
3. Am I using the right file for my 2.8" : ?? Nextion UBITXV5_CEC_V1.200_NX? ?
4. Are there other files I should have loaded before this?

Inquiring minds want to know.
K7TP

1) not only are the calibrations transferable, my version uses the same locations to read and store the calibrations, so once you have a working calibration, you shouldn't have to recalibrate at all if you decide to use my software
2) no. The stock software doesn't support the manager, and that's not a feature I added
I can't answer 3&4 because I don't have any experience with nextion screens. Related: you'll need to use the KD8CEC software if you use the nextion screen - there's no support for it in my software.


Reed

Grover,

1 - Yes, the values are dependant on the Raduino and Mainboard
2 - No, as far as I know, the Memory Manager only works with the KD8CEC software.? There is a modification that can be made to the old stock software posted on his site, however, I do not believe there is enough memory available to add it to the v6 stock software.
3 - Yes, that is the correct file for both the v5 and v6 uBITX boards?
4 - There are not any files to load onto the Nano on the Raduino board.? You do need the correct tft file loaded on the Nextion display.? The wrong file for the display will not be recognized by the display.

There are two possible ways to transfer the calibration settings:
1 - use the same Nano and just overwrite the stock program with the KD8CEC program
2 - Record the values you set with the stock software on paper when you set them, and then use the Memory Manager software to write those values to the Nano.

Note:? The Frequency calibration has little impact on the receiver sensitivity.? Frequency adjustment is to ensure that the displayed value is accurate.? The BFO tuning has a HUGE impact on the receiver sensitivity.? ?Mis adjustment of that value can cause the sidebands to be reversed, or the received signal to fall outside of the filter passbands.

I would recommend that you try just the BFO tuning to start, and see if the dial is off.

73
Evan
AC9TU

SUCCESS (mostly).? Replacing the Nano and loading the correct hex file using XLoader, incidentally the same file I had tried earlier, I am now hearing signals on all bands,
Calibration is not quite on though and I'm not hearing ssb as I should. It seems as though the BFO settings using Farhan's tuning tool is not quite doing it. So I'm recalibrating, again.
But I'm 99% there and that is a cause for celebration.
Thanks for all the help. I think this is going to work out and it certainly has provided a lot of learning.
72
Grover K7TP